Class tmsebufdataset

Description
Hierarchy
Fields
Methods
Properties

Unit

msebufdataset

Declaration

type tmsebufdataset = class(tmdbdataset, iblobchache, idatasetsum, imasterlink, idbdata, iobjectlink)

Description

Keeps three buffers: the record buffer holds all fetched records (fkdata and fkinternalcalc field values — see oninternalcalcfields); the update buffer, managed by this class, holds a copy of a record's original values as soon as it is first modified/inserted/deleted by Post, used by applyupdates to build the update statements and by cancelupdates (all pending records) or cancelupdate (the current record only) to restore the record buffer; the edit buffer, managed by the inherited tdataset, is the display/edit window used by the connected widgets and grids (as many rows as the largest connected grid needs) and is also where fkcalculated field values, computed on the fly by OnCalcFields, live — unlike fkdata/fkinternalcalc fields, they are not part of the record buffer. Only fkdata and fkinternalcalc fields can be used in indexlocal.

Hierarchy

Overview

Fields

Protected foldopts: bufdatasetoptionsty;
Protected fcontroller: tdscontroller;
Protected foptions: bufdatasetoptionsty;
Protected fbrecordcount: integer;
Protected ffieldinfos: fieldinfoarty;
Protected ffieldorder: integerarty;
Protected factindexpo: pindexty;
Protected fbstate: bufdatasetstatesty;
Protected fbstate1: bufdatasetstates1ty;
Protected fallpacketsfetched: boolean;
Protected fapplyindex: integer;
Protected ffailedcount: integer;
Protected frecno: integer;
Protected findexes: array of indexty;
Protected fblobcache: blobcacheinfoarty;
Protected fblobcount: integer;
Protected ffreedblobs: integerarty;
Protected ffreedblobcount: integer;
Protected fcurrentbuf: pintrecordty;
Protected fcurrentupdating: integer;
Protected flastcurrentindex: integer;
Protected fsavepointlevel: integer;
Protected fappliedcount: card32;

Methods

Protected procedure doidleapplyupdates() virtual;
Protected procedure setoptions(const avalue: bufdatasetoptionsty) virtual;
Protected function getdefaultoptions: bufdatasetoptionsty virtual;
Protected procedure openlocal;
Protected procedure fixupcurrentset; virtual;
Protected procedure currentcheckbrowsemode;
Protected function getrestorerecno: boolean;
Protected procedure setrestorerecno(const avalue: boolean);
Protected procedure dogetcoldata(const afield: tfield; const afieldtype: tfieldtype; const step: integer; const data: pointer);
Protected function getcurrentlookuppo(const afield: tfield; const afieldtype: tfieldtype; const arecord: pintrecordty): pointer;
Protected function getcurrentpo(const afield: tfield; const afieldtype: tfieldtype; const arecord: pintrecordty): pointer;
Protected function beforecurrentget(const afield: tfield; const afieldtype: tfieldtype; var aindex: integer): pointer;
Protected function beforecurrentbmget(const afield: tfield; const afieldtype: tfieldtype; const abm: bookmarkdataty): pointer;
Protected function setcurrentpo(const afield: tfield; const afieldtype: tfieldtype; const arecord: precheaderty; const aisnull: boolean; out changed: boolean): pointer;
Protected function beforecurrentset(const afield: tfield; const afieldtype: tfieldtype; var aindex: integer; const aisnull: boolean; out changed: boolean): pointer;
Protected procedure aftercurrentset(const afield: tfield); virtual;
Protected function beforecurrentbmset(const afield: tfield; const afieldtype: tfieldtype; const abm: bookmarkdataty; const aisnull: boolean; out changed: boolean): pointer;
Protected procedure getbminteger(const afield: tfield; const bm: bookmarkdataty; var adata: lookupdataty);
Protected procedure getbmlargeint(const afield: tfield; const bm: bookmarkdataty; var adata: lookupdataty);
Protected procedure getbmcurrency(const afield: tfield; const bm: bookmarkdataty; var adata: lookupdataty);
Protected procedure getbmfloat(const afield: tfield; const bm: bookmarkdataty; var adata: lookupdataty);
Protected procedure getbmstring(const afield: tfield; const bm: bookmarkdataty; var adata: lookupdataty);
Protected procedure getbmboolean(const afield: tfield; const bm: bookmarkdataty; var adata: lookupdataty);
Protected procedure getbmdatetime(const afield: tfield; const bm: bookmarkdataty; var adata: lookupdataty);
Protected procedure getbmvariant(const afield: tfield; const bm: bookmarkdataty; var adata: lookupdataty);
Protected procedure getbmguid(const afield: tfield; const bm: bookmarkdataty; var adata: lookupdataty);
Protected function getfieldbuffer(const afield: tfield; out buffer: pointer; out datasize: integer): boolean; overload;
Protected function getfieldbuffer(const afield: tfield; const aisnull: boolean; out datasize: integer): pointer; overload; virtual;
Protected procedure fieldchanged(const field: tfield);
Protected function getfiltereditkind: filtereditkindty;
Protected function blobsarefetched: boolean;
Protected function getblobcache: blobcacheinfoarty;
Protected function findcachedblob(var info: blobcacheinfoty): boolean; overload;
Protected function findcachedblob(const id: int64; out info: blobcacheinfoty): boolean; overload;
Protected function addblobcache(const adata: pointer; const alength: integer): integer; overload;
Protected function addblobcache(const aid: int64; const adata: string): integer; overload;
Protected procedure updatestate;
Protected function getintblobpo: pblobinfoarty;
Protected procedure internalcancel; override;
Protected procedure FreeFieldBuffers; override;
Protected procedure cancelrecupdate(var arec: recupdatebufferty);
Protected procedure setdatastringvalue(const afield: tfield; const avalue: string);
Protected procedure resetblobcache;
Protected procedure sortblobcache;
Protected procedure fetchblobs;
Protected procedure fetchallblobs;
Protected procedure getofflineblob(const data: precheaderty; const aindex: integer; out ainfo: blobstreaminfoty);
Protected procedure setofflineblob(const adata: precheaderty; const aindex: integer; const ainfo: blobstreaminfoty);
Protected function getblobrecpo: precheaderty;
Protected procedure savepointevent(const sender: tmdbtransaction; const akind: savepointeventkindty; const alevel: integer); override;
Protected procedure packrecupdatebuffer;
Protected procedure restorerecupdatebuffer;
Protected procedure postrecupdatebuffer;
Protected procedure recupdatebufferapplied(const abuf: precupdatebufferty);
Protected procedure recupdatebufferdropped(const abuf: precupdatebufferty);
Protected procedure editapplyerror(const arecupdatenum: integer);
Protected procedure internalapplyupdate(const maxerrors: integer; const cancelonerror: boolean; const cancelondeleteerror: boolean; out response: resolverresponsesty);
Protected procedure afterapply; virtual;
Protected procedure freeblob(const ablob: blobinfoty);
Protected procedure freeblobs(var ablobs: blobinfoarty);
Protected procedure deleteblob(var ablobs: blobinfoarty; const aindex: integer; const afreeblob: boolean); overload;
Protected procedure deleteblob(var ablobs: blobinfoarty; const afield: tfield; const adeleteitem: boolean); overload;
Protected procedure addblob(const ablob: tblobbuffer);
Protected procedure setrecno1(value: longint; const nocheck: boolean);
Protected procedure setrecno(value: longint); override;
Protected function getrecno: longint; override;
Protected function getchangecount: integer; virtual;
Protected function getapplyerrorcount: integer; virtual;
Protected function allocrecordbuffer: pchar; override;
Protected procedure internalinitrecord(buffer: pchar); override;
Protected procedure clearcalcfields(buffer: pchar); override;
Protected procedure freerecordbuffer(var buffer: pchar); override;
Protected function getcanmodify: boolean; override;
Protected function getrecord(buffer: pchar; getmode: tgetmode; docheck: boolean): tgetresult; override;
Protected function GetNextRecord: Boolean; override;
Protected function GetNextRecords: Longint; override;
Protected function bookmarkdatatobookmark(const abookmark: bookmarkdataty): bookmarkty;
Protected function bookmarktobookmarkdata(const abookmark: bookmarkty): bookmarkdataty;
Protected function findbookmarkindex(const abookmark: bookmarkdataty): integer;
Protected procedure checkrecno(const avalue: integer);
Protected procedure setonfilterrecord(const value: tfilterrecordevent); override;
Protected procedure setfiltered(value: boolean); override;
Protected procedure filterchanged1(const aloaded: boolean);
Protected procedure setactive(value: boolean); override;
Protected procedure CalculateFields(Buffer: PChar); override;
Protected procedure notification(acomponent: tcomponent; operation: toperation) override;
Protected procedure loadedoverride;
Protected procedure defineproperties(filer: tfiler) override;
Protected procedure readstate(reader: treader) override;
Protected procedure OpenCursor(InfoQuery: Boolean); override;
Protected procedure internalopen; override;
Protected procedure internalclose; override;
Protected procedure clearbuffers; override;
Protected procedure internalinsert; override;
Protected procedure internaledit; override;
Protected procedure dataevent(event: tdataevent; info: ptrint); override;
Protected procedure checkconnected;
Protected procedure startlogger;
Protected procedure closelogger;
Protected procedure savestate(const awriter: tbufstreamwriter);
Protected function getfieldclass(fieldtype: tfieldtype): tfieldclass; override;
Protected function getnextpacket(const all: boolean) : integer;
Protected function getrecordsize: word; override;
Protected procedure saveindex(const oldbuffer,newbuffer: pintrecordty; var ar1,ar2,ar3: integerarty);
Protected procedure relocateindex(const abuffer: pintrecordty; const ar1,ar2,ar3: integerarty);
Protected procedure internalpost; override;
Protected procedure internaldelete; override;
Protected procedure internalfirst; override;
Protected procedure internallast; override;
Protected procedure internalsettorecord(buffer: pchar); override;
Protected procedure internalgotobookmark(abookmark: pointer); override;
Protected procedure setbookmarkdata(buffer: pchar; data: pointer); override;
Protected procedure setbookmarkflag(buffer: pchar; value: tbookmarkflag); override;
Protected procedure getbookmarkdata(buffer: pchar; data: pointer); override;
Protected function getbookmarkdata1: bookmarkdataty;
Protected function getbookmarkflag(buffer: pchar): tbookmarkflag; override;
Protected function getfieldblobid(const field: tfield; out aid: blobidty): boolean;
Protected function iscursoropen: boolean; override;
Protected function getrecordcount: longint; override;
Protected procedure applyrecupdate(updatekind : tupdatekind); virtual;
Protected procedure setonupdateerror(const avalue: updateerroreventty);
Protected function findrecord(arecordpo: pintrecordty): integer; reintroduce;
Protected procedure dofilterrecord(var acceptable: boolean); virtual;
Protected procedure dobeforeapplyupdate; virtual;
Protected procedure doafterapplyupdate; virtual;
Protected procedure dointernalcalcfields(const fetching: boolean);
Protected function islocal: boolean; virtual;
Protected function updatesortfield(const afield: tfield; const adescend: boolean): boolean;
Protected function getobjectlinker: tobjectlinker;
Protected procedure objectevent(const sender: tobject; const event: objecteventty); virtual;
Protected procedure link(const source,dest: iobjectlink; valuepo: pointer = nil; ainterfacetype: pointer = nil; once: boolean = false);
Protected procedure unlink(const source,dest: iobjectlink; valuepo: pointer = nil); virtual;
Protected procedure objevent(const sender: iobjectlink; const event: objecteventty); virtual;
Protected function getinstance: tobject;
Protected function getcomponent: tcomponent;
Protected procedure begindisplaydata;
Protected procedure enddisplaydata;
Protected function getsavepointoptions(): savepointoptionsty;
Protected function getindex(const afield: tfield): integer;
Protected function gettextindex(const afield: tfield; const acaseinsensitive: boolean): integer;
Protected function lookuptext(const indexnum: integer; const akey: integer; const aisnull: boolean; const valuefield: tmsestringfield): msestring; overload;
Protected function lookuptext(const indexnum: integer; const akey: int64; const aisnull: boolean; const valuefield: tmsestringfield): msestring; overload;
Protected function lookuptext(const indexnum: integer; const akey: msestring; const aisnull: boolean; const valuefield: tmsestringfield): msestring; overload;
Protected function findtext(const indexnum: integer; const searchtext: msestring; out arecord: integer): boolean;
Protected function getrowtext(const indexnum: integer; const arecord: integer; const afield: tfield): msestring;
Protected function getrowinteger(const indexnum: integer; const arecord: integer; const afield: tfield): integer;
Protected function getrowlargeint(const indexnum: integer; const arecord: integer; const afield: tfield): int64;
Protected function fetch: boolean; virtual; abstract;
Protected function getblobdatasize: integer; virtual; abstract;
Protected function blobscached: boolean; virtual; abstract;
Protected function loadfield(const afieldno: integer; const afieldtype: tfieldtype; const buffer: pointer; var bufsize: integer): boolean; virtual; abstract;
Protected function islastrecord: boolean;
Protected procedure checkfreebuffer(const afield: tfield);
Protected function callvalidate(const afield: tfield; const avalue: pointer): boolean;
Protected procedure checkvaluebuffer(const afield: tfield; const asize: integer);
Protected function refreshrecordvarar(const sourcedatasets: array of tdataset; const akeyvalue: array of variant; const keyindex: integer; const acancelupdate: boolean; const restorerecno: boolean; const noinsert: boolean): bookmarkdataty;
Public constructor create(aowner: tcomponent); override;
Public destructor destroy; override;
Public procedure enablecontrols; override;
Public procedure beginlookupupdate();
Public procedure endlookupupdate();
Public procedure updaterecord(); override;
Public procedure post; override;
Public procedure gotobookmark(const abookmark: bookmarkdataty); overload;
Public function findbookmark(const abookmark: bookmarkdataty): boolean;
Public function recnobookmark(const arecnozerobased: int32): bookmarkdataty;
Public function createblobstream(field: tfield; mode: tblobstreammode): tstream; override;
Public function getfielddata(field: tfield; buffer: pointer; nativeformat: boolean): boolean; override;
Public function getfielddata(field: tfield; buffer: pointer): boolean; override;
Public procedure setfielddata(field: tfield; buffer: pointer; nativeformat: boolean); override;
Public procedure setfielddata(field: tfield; buffer: pointer); override;
Public procedure Append;
Public procedure notifycontrols;
Public procedure recover;
Public procedure startlogging;
Public procedure stoplogging;
Public procedure savetostream(const astream: tstream);
Public procedure loadfromstream(const astream: tstream);
Public procedure savetofile(afilename: filenamety = ''; const acryptohandler: tcustomcryptohandler = nil);
Public procedure loadfromfile(afilename: filenamety = ''; const acryptohandler: tcustomcryptohandler = nil);
Public function streamloading: boolean;
Public function refreshrecord(const akeyfield: array of tfield; const keyindex: integer = 0; const acancelupdate: boolean = true; const restorerecno: boolean = true; const noinsert: boolean = false): bookmarkdataty; overload;
Public function refreshrecord(const sourcedatasets: array of tdataset; const akeyvalue: array of variant; const keyindex: integer = 0; const acancelupdate: boolean = true; const restorerecno: boolean = true; const noinsert: boolean = false): bookmarkdataty; overload;
Public function refreshrecord(const asourcefields: array of tfield; const akeyfield: array of tfield; const keyindex: integer = 0; const acancelupdate: boolean = true; const restorerecno: boolean = true; const noinsert: boolean = false): bookmarkdataty; overload;
Public function refreshrecord(const asourcefields: array of tfield; const adestfields: array of tfield; const akeyfield: array of tfield; const keyindex: integer = 0; const acancelupdate: boolean = true; const restorerecno: boolean = true; const noinsert: boolean = false): bookmarkdataty; overload;
Public function refreshrecord(const asourcefields: array of tfield; const adestfields: array of tfield; const akeyvalue: array of variant; const keyindex: integer = 0; const acancelupdate: boolean = true; const restorerecno: boolean = true; const noinsert: boolean = false): bookmarkdataty; overload;
Public function refreshrecord(const asourcevalues: array of variant; const adestfields: array of tfield; const akeyvalue: array of variant; const keyindex: integer = 0; const acancelupdate: boolean = true; const restorerecno: boolean = true; const noinsert: boolean = false): bookmarkdataty; overload;
Public procedure copyfieldvalues(const bm: bookmarkdataty; const dest: tdataset); overload;
Public procedure copyfieldvalues(const bm: bookmarkdataty; const dest: tmsebufdataset; const acancelupdate: boolean); overload;
Public function isutf8: boolean; virtual;
Public procedure bindfields(const bind: boolean);
Public function findfields(const anames: string): fieldarty; overload;
Public function findfields(const anames: string; out afields: fieldarty): boolean; overload;
Public procedure fieldtoparam(const source: tfield; const dest: tparam);
Public procedure oldfieldtoparam(const source: tfield; const dest: tparam);
Public procedure stringtoparam(const source: msestring; const dest: tparam);
Public function recordisnull(): boolean;
Public procedure clearrecord();
Public procedure clearfilter();
Public procedure beginfilteredit(const akind: filtereditkindty);
Public procedure endfilteredit;
Public function beginfiltervalue(const akind: filtereditkindty): tdatasetstate;
Public procedure endfiltervalue(const astatebefore: tdatasetstate);
Public procedure filterchanged();
Public function fieldfiltervalue(const afield: tfield; const akind: filtereditkindty = fek_filter): variant;
Public function fieldfiltervalueisnull(const afield: tfield; const akind: filtereditkindty = fek_filter): boolean;
Public function checkfiltervalue(const afield: tfield; const akind: filtereditkindty = fek_filter; const acaseinsensitive: boolean = true): boolean;
Public function checkfiltervalues(const afield: tfield; const acaseinsensitive: boolean = true): boolean;
Public function checkfiltervalues(const acaseinsensitive: boolean = true): boolean;
Public function locate(const afields: array of tfield; const akeys: array of const; const aisnull: array of boolean; const akeyoptions: array of locatekeyoptionsty; const aoptions: locaterecordoptionsty = []): locateresultty; reintroduce;
Public function locaterecno(const arecno: integer): boolean;
Public function countvisiblerecords: integer;
Public procedure fetchall;
Public procedure resetindex;
Public function createblobbuffer(const afield: tfield): tblobbuffer;
Public procedure applyupdates(const maxerrors: integer = 0); overload; virtual;
Public procedure applyupdates(const maxerrors: integer; const cancelonerror: boolean; const cancelondeleteerror: boolean = false; const editonerror: boolean = false); overload; virtual;
Public procedure applyupdate(const cancelonerror: boolean; const cancelondeleteerror: boolean = false; const editonerror: boolean = false); overload; virtual;
Public procedure applyupdate; overload; virtual;
Public function recapplying: boolean;
Public procedure dropupdates();
Public procedure cancelupdates; virtual;
Public procedure cancelupdate(const norecordcancel: boolean = false); virtual;
Public function updatestatus: tupdatestatus; overload; override;
Public function updatestatus(out aflags: recupdateflagsty): tupdatestatus; overload;
Public procedure currentbeginupdate; virtual;
Public procedure currentendupdate; virtual;
Public function currentrecordhigh: integer;
Public procedure currentclear(const afield: tfield; aindex: integer);
Public procedure currentassign(const source: tfield; const dest: tfield; aindex: integer);
Public procedure currentbmclear(const afield: tfield; const abm: bookmarkdataty);
Public procedure currentbmassign(const source: tfield; const dest: tfield; const abm: bookmarkdataty);
Public procedure getcoldata(const afield: tfield; const adatalist: tdatalist);
Public procedure asarray(const afield: tfield; out avalue: int64arty); overload;
Public procedure asarray(const afield: tfield; out avalue: integerarty); overload;
Public procedure asarray(const afield: tfield; out avalue: stringarty); overload;
Public procedure asarray(const afield: tfield; out avalue: msestringarty); overload;
Public procedure asarray(const afield: tfield; out avalue: currencyarty); overload;
Public procedure asarray(const afield: tfield; out avalue: realarty); overload;
Public procedure asarray(const afield: tfield; out avalue: datetimearty); overload;
Public procedure asarray(const afield: tfield; out avalue: booleanarty); overload;
Public function getdata(const afields: array of tfield): variantararty;
Public procedure sumfield(const afield: tfield; out asum: double); overload;
Public procedure sumfield(const afield: tfield; out asum: currency); overload;
Public procedure sumfield(const afield: tfield; out asum: integer); overload;
Public procedure sumfield(const afield: tfield; out asum: int64); overload;
Public function sumfielddouble(const afield: tfield): double;
Public function sumfieldcurrency(const afield: tfield): currency;
Public function sumfieldinteger(const afield: tfield): integer;
Public function sumfieldint64(const afield: tfield): int64;

Properties

Protected property actindex: integer read factindex write setactindex;
Protected property nullmasksize: integer read fnullmasksize;
Public property bookmarkdata: bookmarkdataty read getbookmarkdata1 write setbookmarkdata1;
Public property logging: boolean read getlogging;
Public property filtereditkind: filtereditkindty read ffiltereditkind write ffiltereditkind;
Public property changecount: integer read getchangecount;
Public property changerecords: recupdateinfoarty read getchangerecords;
Public property applyerrorcount: integer read getapplyerrorcount;
Public property applyerrorrecords: recupdateinfoarty read getapplyerrorrecords;
Public property appliedcount: card32 read fappliedcount;
Public property recnozerobased: int32 read getrecnozerobased write setrecnozerobased;
Public property currentisnull[const afield: tfield; aindex: integer]: boolean read getcurrentisnull;
Public property currentasvariant[const afield: tfield; aindex: integer]: variant read getcurrentasvariant write setcurrentasvariant;
Public property currentasboolean[const afield: tfield; aindex: integer]: boolean read getcurrentasboolean write setcurrentasboolean;
Public property currentasinteger[const afield: tfield; aindex: integer]: integer read getcurrentasinteger write setcurrentasinteger;
Public property currentaslargeint[const afield: tfield; aindex: integer]: int64 read getcurrentaslargeint write setcurrentaslargeint;
Public property currentasid[const afield: tfield; aindex: integer]: int64 read getcurrentasid write setcurrentasid;
Public property currentasfloat[const afield: tfield; aindex: integer]: double read getcurrentasfloat write setcurrentasfloat;
Public property currentasdatetime[const afield: tfield; aindex: integer]: tdatetime read getcurrentasdatetime write setcurrentasdatetime;
Public property currentascurrency[const afield: tfield; aindex: integer]: currency read getcurrentascurrency write setcurrentascurrency;
Public property currentasmsestring[const afield: tfield; aindex: integer]: msestring read getcurrentasmsestring write setcurrentasmsestring;
Public property currentasguid[const afield: tfield; aindex: integer]: tguid read getcurrentasguid write setcurrentasguid;
Public property currentbmisnull[const afield: tfield; const abm: bookmarkdataty]: boolean read getcurrentbmisnull;
Public property currentbmasvariant[const afield: tfield; const abm: bookmarkdataty]: variant read getcurrentbmasvariant write setcurrentbmasvariant;
Public property currentbmasboolean[const afield: tfield; const abm: bookmarkdataty]: boolean read getcurrentbmasboolean write setcurrentbmasboolean;
Public property currentbmasinteger[const afield: tfield; const abm: bookmarkdataty]: integer read getcurrentbmasinteger write setcurrentbmasinteger;
Public property currentbmaslargeint[const afield: tfield; const abm: bookmarkdataty]: int64 read getcurrentbmaslargeint write setcurrentbmaslargeint;
Public property currentbmasid[const afield: tfield; const abm: bookmarkdataty]: int64 read getcurrentbmasid write setcurrentbmasid;
Public property currentbmasfloat[const afield: tfield; const abm: bookmarkdataty]: double read getcurrentbmasfloat write setcurrentbmasfloat;
Public property currentbmasdatetime[const afield: tfield; const abm: bookmarkdataty]: tdatetime read getcurrentbmasdatetime write setcurrentbmasdatetime;
Public property currentbmascurrency[const afield: tfield; const abm: bookmarkdataty]: currency read getcurrentbmascurrency write setcurrentbmascurrency;
Public property currentbmasmsestring[const afield: tfield; const abm: bookmarkdataty]: msestring read getcurrentbmasmsestring write setcurrentbmasmsestring;
Public property currentbmasguid[const afield: tfield; const abm: bookmarkdataty]: tguid read getcurrentbmasguid write setcurrentbmasguid;
Public property delayedapplycount: integer read fdelayedapplycount write setdelayedapplycount default 0;
Published property options: bufdatasetoptionsty read foptions write setoptions default [];
Published property logfilename: filenamety read flogfilename write flogfilename;
Published property cryptohandler: tcustomcryptohandler read fcryptohandler write setcryptohandler;
Published property packetrecords : integer read fpacketrecords write setpacketrecords default defaultpacketrecords;
Published property indexlocal: tlocalindexes read findexlocal write setindexlocal;
Published property onupdateerror: updateerroreventty read fonupdateerror write setonupdateerror;
Published property oninternalcalcfields: internalcalcfieldseventty read foninternalcalcfields write setoninternalcalcfields;
Published property beforeapplyupdate: tdatasetnotifyevent read fbeforeapplyupdate write fbeforeapplyupdate;
Published property afterapplyupdate: tdatasetnotifyevent read fafterapplyupdate write fafterapplyupdate;
Published property beforebeginfilteredit: filterediteventty read fbeforebeginfilteredit write fbeforebeginfilteredit;
Published property afterbeginfilteredit: filterediteventty read fafterbeginfilteredit write fafterbeginfilteredit;
Published property beforeendfilteredit: filterediteventty read fbeforeendfilteredit write fbeforeendfilteredit;
Published property afterendfilteredit: filterediteventty read fafterendfilteredit write fafterendfilteredit;
Published property beforefilterchanged: bufdataseteventty read fbeforefilterchanged write fbeforefilterchanged;
Published property afterfilterchanged: bufdataseteventty read fafterfilterchanged write fafterfilterchanged;
Published property Active default false;

Description

Fields

Protected foldopts: bufdatasetoptionsty;

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Protected fcontroller: tdscontroller;

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Protected foptions: bufdatasetoptionsty;

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Protected fbrecordcount: integer;

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Protected ffieldinfos: fieldinfoarty;

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Protected ffieldorder: integerarty;

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Protected factindexpo: pindexty;

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Protected fbstate: bufdatasetstatesty;

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Protected fbstate1: bufdatasetstates1ty;

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Protected fallpacketsfetched: boolean;

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Protected fapplyindex: integer;

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Protected ffailedcount: integer;

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Protected frecno: integer;

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Protected findexes: array of indexty;

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Protected fblobcache: blobcacheinfoarty;

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Protected fblobcount: integer;

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Protected ffreedblobs: integerarty;

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Protected ffreedblobcount: integer;

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Protected fcurrentbuf: pintrecordty;

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Protected fcurrentupdating: integer;

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Protected flastcurrentindex: integer;

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Protected fsavepointlevel: integer;

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Protected fappliedcount: card32;

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Methods

Protected procedure doidleapplyupdates() virtual;

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Protected procedure setoptions(const avalue: bufdatasetoptionsty) virtual;

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Protected function getdefaultoptions: bufdatasetoptionsty virtual;

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Protected procedure openlocal;

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Protected procedure fixupcurrentset; virtual;

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Protected procedure currentcheckbrowsemode;

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Protected function getrestorerecno: boolean;

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Protected procedure setrestorerecno(const avalue: boolean);

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Protected procedure dogetcoldata(const afield: tfield; const afieldtype: tfieldtype; const step: integer; const data: pointer);

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Protected function getcurrentlookuppo(const afield: tfield; const afieldtype: tfieldtype; const arecord: pintrecordty): pointer;

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Protected function getcurrentpo(const afield: tfield; const afieldtype: tfieldtype; const arecord: pintrecordty): pointer;

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Protected function beforecurrentget(const afield: tfield; const afieldtype: tfieldtype; var aindex: integer): pointer;

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Protected function beforecurrentbmget(const afield: tfield; const afieldtype: tfieldtype; const abm: bookmarkdataty): pointer;

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Protected function setcurrentpo(const afield: tfield; const afieldtype: tfieldtype; const arecord: precheaderty; const aisnull: boolean; out changed: boolean): pointer;

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Protected function beforecurrentset(const afield: tfield; const afieldtype: tfieldtype; var aindex: integer; const aisnull: boolean; out changed: boolean): pointer;

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Protected procedure aftercurrentset(const afield: tfield); virtual;

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Protected function beforecurrentbmset(const afield: tfield; const afieldtype: tfieldtype; const abm: bookmarkdataty; const aisnull: boolean; out changed: boolean): pointer;

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Protected procedure getbminteger(const afield: tfield; const bm: bookmarkdataty; var adata: lookupdataty);

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Protected procedure getbmlargeint(const afield: tfield; const bm: bookmarkdataty; var adata: lookupdataty);

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Protected procedure getbmcurrency(const afield: tfield; const bm: bookmarkdataty; var adata: lookupdataty);

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Protected procedure getbmfloat(const afield: tfield; const bm: bookmarkdataty; var adata: lookupdataty);

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Protected procedure getbmstring(const afield: tfield; const bm: bookmarkdataty; var adata: lookupdataty);

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Protected procedure getbmboolean(const afield: tfield; const bm: bookmarkdataty; var adata: lookupdataty);

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Protected procedure getbmdatetime(const afield: tfield; const bm: bookmarkdataty; var adata: lookupdataty);

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Protected procedure getbmvariant(const afield: tfield; const bm: bookmarkdataty; var adata: lookupdataty);

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Protected procedure getbmguid(const afield: tfield; const bm: bookmarkdataty; var adata: lookupdataty);

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Protected function getfieldbuffer(const afield: tfield; out buffer: pointer; out datasize: integer): boolean; overload;

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Protected function getfieldbuffer(const afield: tfield; const aisnull: boolean; out datasize: integer): pointer; overload; virtual;

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Protected procedure fieldchanged(const field: tfield);

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Protected function getfiltereditkind: filtereditkindty;

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Protected function blobsarefetched: boolean;

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Protected function getblobcache: blobcacheinfoarty;

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Protected function findcachedblob(var info: blobcacheinfoty): boolean; overload;

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Protected function findcachedblob(const id: int64; out info: blobcacheinfoty): boolean; overload;

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Protected function addblobcache(const adata: pointer; const alength: integer): integer; overload;

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Protected function addblobcache(const aid: int64; const adata: string): integer; overload;

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Protected procedure updatestate;

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Protected function getintblobpo: pblobinfoarty;

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Protected procedure internalcancel; override;

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Protected procedure FreeFieldBuffers; override;

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Protected procedure cancelrecupdate(var arec: recupdatebufferty);

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Protected procedure setdatastringvalue(const afield: tfield; const avalue: string);

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Protected procedure resetblobcache;

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Protected procedure sortblobcache;

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Protected procedure fetchblobs;

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Protected procedure fetchallblobs;

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Protected procedure getofflineblob(const data: precheaderty; const aindex: integer; out ainfo: blobstreaminfoty);

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Protected procedure setofflineblob(const adata: precheaderty; const aindex: integer; const ainfo: blobstreaminfoty);

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Protected function getblobrecpo: precheaderty;

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Protected procedure savepointevent(const sender: tmdbtransaction; const akind: savepointeventkindty; const alevel: integer); override;

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Protected procedure packrecupdatebuffer;

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Protected procedure restorerecupdatebuffer;

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Protected procedure postrecupdatebuffer;

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Protected procedure recupdatebufferapplied(const abuf: precupdatebufferty);

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Protected procedure recupdatebufferdropped(const abuf: precupdatebufferty);

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Protected procedure editapplyerror(const arecupdatenum: integer);

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Protected procedure internalapplyupdate(const maxerrors: integer; const cancelonerror: boolean; const cancelondeleteerror: boolean; out response: resolverresponsesty);

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Protected procedure afterapply; virtual;

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Protected procedure freeblob(const ablob: blobinfoty);

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Protected procedure freeblobs(var ablobs: blobinfoarty);

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Protected procedure deleteblob(var ablobs: blobinfoarty; const aindex: integer; const afreeblob: boolean); overload;

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Protected procedure deleteblob(var ablobs: blobinfoarty; const afield: tfield; const adeleteitem: boolean); overload;

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Protected procedure addblob(const ablob: tblobbuffer);

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Protected procedure setrecno1(value: longint; const nocheck: boolean);

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Protected procedure setrecno(value: longint); override;

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Protected function getrecno: longint; override;

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Protected function getchangecount: integer; virtual;

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Protected function getapplyerrorcount: integer; virtual;

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Protected function allocrecordbuffer: pchar; override;

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Protected procedure internalinitrecord(buffer: pchar); override;

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Protected procedure clearcalcfields(buffer: pchar); override;

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Protected procedure freerecordbuffer(var buffer: pchar); override;

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Protected function getcanmodify: boolean; override;

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Protected function getrecord(buffer: pchar; getmode: tgetmode; docheck: boolean): tgetresult; override;

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Protected function GetNextRecord: Boolean; override;

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Protected function GetNextRecords: Longint; override;

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Protected function bookmarkdatatobookmark(const abookmark: bookmarkdataty): bookmarkty;

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Protected function bookmarktobookmarkdata(const abookmark: bookmarkty): bookmarkdataty;

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Protected function findbookmarkindex(const abookmark: bookmarkdataty): integer;

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Protected procedure checkrecno(const avalue: integer);

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Protected procedure setonfilterrecord(const value: tfilterrecordevent); override;

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Protected procedure setfiltered(value: boolean); override;

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Protected procedure filterchanged1(const aloaded: boolean);

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Protected procedure setactive(value: boolean); override;

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Protected procedure CalculateFields(Buffer: PChar); override;

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Protected procedure notification(acomponent: tcomponent; operation: toperation) override;

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Protected procedure loadedoverride;

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Protected procedure defineproperties(filer: tfiler) override;

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Protected procedure readstate(reader: treader) override;

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Protected procedure OpenCursor(InfoQuery: Boolean); override;

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Protected procedure internalopen; override;

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Protected procedure internalclose; override;

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Protected procedure clearbuffers; override;

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Protected procedure internalinsert; override;

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Protected procedure internaledit; override;

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Protected procedure dataevent(event: tdataevent; info: ptrint); override;

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Protected procedure checkconnected;

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Protected procedure startlogger;

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Protected procedure closelogger;

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Protected procedure savestate(const awriter: tbufstreamwriter);

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Protected function getfieldclass(fieldtype: tfieldtype): tfieldclass; override;

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Protected function getnextpacket(const all: boolean) : integer;

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Protected function getrecordsize: word; override;

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Protected procedure saveindex(const oldbuffer,newbuffer: pintrecordty; var ar1,ar2,ar3: integerarty);

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Protected procedure relocateindex(const abuffer: pintrecordty; const ar1,ar2,ar3: integerarty);

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Protected procedure internalpost; override;

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Protected procedure internaldelete; override;

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Protected procedure internalfirst; override;

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Protected procedure internallast; override;

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Protected procedure internalsettorecord(buffer: pchar); override;

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Protected procedure internalgotobookmark(abookmark: pointer); override;

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Protected procedure setbookmarkdata(buffer: pchar; data: pointer); override;

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Protected procedure setbookmarkflag(buffer: pchar; value: tbookmarkflag); override;

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Protected procedure getbookmarkdata(buffer: pchar; data: pointer); override;

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Protected function getbookmarkdata1: bookmarkdataty;

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Protected function getbookmarkflag(buffer: pchar): tbookmarkflag; override;

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Protected function getfieldblobid(const field: tfield; out aid: blobidty): boolean;

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Protected function iscursoropen: boolean; override;

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Protected function getrecordcount: longint; override;

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Protected procedure applyrecupdate(updatekind : tupdatekind); virtual;

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Protected procedure setonupdateerror(const avalue: updateerroreventty);

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Protected function findrecord(arecordpo: pintrecordty): integer; reintroduce;

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Protected procedure dofilterrecord(var acceptable: boolean); virtual;

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Protected procedure dobeforeapplyupdate; virtual;

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Protected procedure doafterapplyupdate; virtual;

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Protected procedure dointernalcalcfields(const fetching: boolean);

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Protected function islocal: boolean; virtual;

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Protected function updatesortfield(const afield: tfield; const adescend: boolean): boolean;

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Protected function getobjectlinker: tobjectlinker;

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Protected procedure objectevent(const sender: tobject; const event: objecteventty); virtual;

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Protected procedure link(const source,dest: iobjectlink; valuepo: pointer = nil; ainterfacetype: pointer = nil; once: boolean = false);

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Protected procedure unlink(const source,dest: iobjectlink; valuepo: pointer = nil); virtual;

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Protected procedure objevent(const sender: iobjectlink; const event: objecteventty); virtual;

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Protected function getinstance: tobject;

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Protected function getcomponent: tcomponent;

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Protected procedure begindisplaydata;

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Protected procedure enddisplaydata;

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Protected function getsavepointoptions(): savepointoptionsty;

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Protected function getindex(const afield: tfield): integer;

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Protected function gettextindex(const afield: tfield; const acaseinsensitive: boolean): integer;

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Protected function lookuptext(const indexnum: integer; const akey: integer; const aisnull: boolean; const valuefield: tmsestringfield): msestring; overload;

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Protected function lookuptext(const indexnum: integer; const akey: int64; const aisnull: boolean; const valuefield: tmsestringfield): msestring; overload;

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Protected function lookuptext(const indexnum: integer; const akey: msestring; const aisnull: boolean; const valuefield: tmsestringfield): msestring; overload;

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Protected function findtext(const indexnum: integer; const searchtext: msestring; out arecord: integer): boolean;

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Protected function getrowtext(const indexnum: integer; const arecord: integer; const afield: tfield): msestring;

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Protected function getrowinteger(const indexnum: integer; const arecord: integer; const afield: tfield): integer;

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Protected function getrowlargeint(const indexnum: integer; const arecord: integer; const afield: tfield): int64;

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Protected function fetch: boolean; virtual; abstract;

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Protected function getblobdatasize: integer; virtual; abstract;

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Protected function blobscached: boolean; virtual; abstract;

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Protected function loadfield(const afieldno: integer; const afieldtype: tfieldtype; const buffer: pointer; var bufsize: integer): boolean; virtual; abstract;

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Protected function islastrecord: boolean;

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Protected procedure checkfreebuffer(const afield: tfield);

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Protected function callvalidate(const afield: tfield; const avalue: pointer): boolean;

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Protected procedure checkvaluebuffer(const afield: tfield; const asize: integer);

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Protected function refreshrecordvarar(const sourcedatasets: array of tdataset; const akeyvalue: array of variant; const keyindex: integer; const acancelupdate: boolean; const restorerecno: boolean; const noinsert: boolean): bookmarkdataty;

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Public constructor create(aowner: tcomponent); override;

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Public destructor destroy; override;

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Public procedure enablecontrols; override;

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Public procedure beginlookupupdate();

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Public procedure endlookupupdate();

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Public procedure updaterecord(); override;

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Public procedure post; override;

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Public procedure gotobookmark(const abookmark: bookmarkdataty); overload;

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Public function findbookmark(const abookmark: bookmarkdataty): boolean;

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Public function recnobookmark(const arecnozerobased: int32): bookmarkdataty;

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Public function createblobstream(field: tfield; mode: tblobstreammode): tstream; override;

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Public function getfielddata(field: tfield; buffer: pointer; nativeformat: boolean): boolean; override;

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Public function getfielddata(field: tfield; buffer: pointer): boolean; override;

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Public procedure setfielddata(field: tfield; buffer: pointer; nativeformat: boolean); override;

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Public procedure setfielddata(field: tfield; buffer: pointer); override;

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Public procedure Append;

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Public procedure notifycontrols;

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Public procedure recover;

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Public procedure startlogging;

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Public procedure stoplogging;

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Public procedure savetostream(const astream: tstream);

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Public procedure loadfromstream(const astream: tstream);

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Public procedure savetofile(afilename: filenamety = ''; const acryptohandler: tcustomcryptohandler = nil);

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Public procedure loadfromfile(afilename: filenamety = ''; const acryptohandler: tcustomcryptohandler = nil);

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Public function streamloading: boolean;

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Public function refreshrecord(const akeyfield: array of tfield; const keyindex: integer = 0; const acancelupdate: boolean = true; const restorerecno: boolean = true; const noinsert: boolean = false): bookmarkdataty; overload;

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Public function refreshrecord(const sourcedatasets: array of tdataset; const akeyvalue: array of variant; const keyindex: integer = 0; const acancelupdate: boolean = true; const restorerecno: boolean = true; const noinsert: boolean = false): bookmarkdataty; overload;

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Public function refreshrecord(const asourcefields: array of tfield; const akeyfield: array of tfield; const keyindex: integer = 0; const acancelupdate: boolean = true; const restorerecno: boolean = true; const noinsert: boolean = false): bookmarkdataty; overload;

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Public function refreshrecord(const asourcefields: array of tfield; const adestfields: array of tfield; const akeyfield: array of tfield; const keyindex: integer = 0; const acancelupdate: boolean = true; const restorerecno: boolean = true; const noinsert: boolean = false): bookmarkdataty; overload;

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Public function refreshrecord(const asourcefields: array of tfield; const adestfields: array of tfield; const akeyvalue: array of variant; const keyindex: integer = 0; const acancelupdate: boolean = true; const restorerecno: boolean = true; const noinsert: boolean = false): bookmarkdataty; overload;

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Public function refreshrecord(const asourcevalues: array of variant; const adestfields: array of tfield; const akeyvalue: array of variant; const keyindex: integer = 0; const acancelupdate: boolean = true; const restorerecno: boolean = true; const noinsert: boolean = false): bookmarkdataty; overload;

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Public procedure copyfieldvalues(const bm: bookmarkdataty; const dest: tdataset); overload;

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Public procedure copyfieldvalues(const bm: bookmarkdataty; const dest: tmsebufdataset; const acancelupdate: boolean); overload;

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Public function isutf8: boolean; virtual;

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Public procedure bindfields(const bind: boolean);

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Public function findfields(const anames: string): fieldarty; overload;

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Public function findfields(const anames: string; out afields: fieldarty): boolean; overload;

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Public procedure fieldtoparam(const source: tfield; const dest: tparam);

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Public procedure oldfieldtoparam(const source: tfield; const dest: tparam);

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Public procedure stringtoparam(const source: msestring; const dest: tparam);

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Public function recordisnull(): boolean;

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Public procedure clearrecord();

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Public procedure clearfilter();

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Public procedure beginfilteredit(const akind: filtereditkindty);

Between beginfilteredit and endfilteredit, the dataset's bound edit widgets display and edit a separate filter-value record instead of the current data record — a way to let the user enter filter criteria with the normal data-aware widgets. Copy the needed field values out (e.g. into local variables) before endfilteredit returns, to use them in OnFilterRecord.

Public procedure endfilteredit;

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Public function beginfiltervalue(const akind: filtereditkindty): tdatasetstate;

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Public procedure endfiltervalue(const astatebefore: tdatasetstate);

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Public procedure filterchanged();

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Public function fieldfiltervalue(const afield: tfield; const akind: filtereditkindty = fek_filter): variant;

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Public function fieldfiltervalueisnull(const afield: tfield; const akind: filtereditkindty = fek_filter): boolean;

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Public function checkfiltervalue(const afield: tfield; const akind: filtereditkindty = fek_filter; const acaseinsensitive: boolean = true): boolean;

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Public function checkfiltervalues(const afield: tfield; const acaseinsensitive: boolean = true): boolean;

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Public function checkfiltervalues(const acaseinsensitive: boolean = true): boolean;

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Public function locate(const afields: array of tfield; const akeys: array of const; const aisnull: array of boolean; const akeyoptions: array of locatekeyoptionsty; const aoptions: locaterecordoptionsty = []): locateresultty; reintroduce;

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Public function locaterecno(const arecno: integer): boolean;

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Public function countvisiblerecords: integer;

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Public procedure fetchall;

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Public procedure resetindex;

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Public function createblobbuffer(const afield: tfield): tblobbuffer;

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Public procedure applyupdates(const maxerrors: integer = 0); overload; virtual;

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Public procedure applyupdates(const maxerrors: integer; const cancelonerror: boolean; const cancelondeleteerror: boolean = false; const editonerror: boolean = false); overload; virtual;

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Public procedure applyupdate(const cancelonerror: boolean; const cancelondeleteerror: boolean = false; const editonerror: boolean = false); overload; virtual;

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Public procedure applyupdate; overload; virtual;

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Public function recapplying: boolean;

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Public procedure dropupdates();

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Public procedure cancelupdates; virtual;

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Public procedure cancelupdate(const norecordcancel: boolean = false); virtual;

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Public function updatestatus: tupdatestatus; overload; override;

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Public function updatestatus(out aflags: recupdateflagsty): tupdatestatus; overload;

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Public procedure currentbeginupdate; virtual;

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Public procedure currentendupdate; virtual;

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Public function currentrecordhigh: integer;

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Public procedure currentclear(const afield: tfield; aindex: integer);

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Public procedure currentassign(const source: tfield; const dest: tfield; aindex: integer);

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Public procedure currentbmclear(const afield: tfield; const abm: bookmarkdataty);

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Public procedure currentbmassign(const source: tfield; const dest: tfield; const abm: bookmarkdataty);

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Public procedure getcoldata(const afield: tfield; const adatalist: tdatalist);

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Public procedure asarray(const afield: tfield; out avalue: int64arty); overload;

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Public procedure asarray(const afield: tfield; out avalue: integerarty); overload;

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Public procedure asarray(const afield: tfield; out avalue: stringarty); overload;

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Public procedure asarray(const afield: tfield; out avalue: msestringarty); overload;

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Public procedure asarray(const afield: tfield; out avalue: currencyarty); overload;

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Public procedure asarray(const afield: tfield; out avalue: realarty); overload;

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Public procedure asarray(const afield: tfield; out avalue: datetimearty); overload;

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Public procedure asarray(const afield: tfield; out avalue: booleanarty); overload;

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Public function getdata(const afields: array of tfield): variantararty;

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Public procedure sumfield(const afield: tfield; out asum: double); overload;

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Public procedure sumfield(const afield: tfield; out asum: currency); overload;

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Public procedure sumfield(const afield: tfield; out asum: integer); overload;

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Public procedure sumfield(const afield: tfield; out asum: int64); overload;

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Public function sumfielddouble(const afield: tfield): double;

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Public function sumfieldcurrency(const afield: tfield): currency;

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Public function sumfieldinteger(const afield: tfield): integer;

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Public function sumfieldint64(const afield: tfield): int64;

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Properties

Protected property actindex: integer read factindex write setactindex;

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Protected property nullmasksize: integer read fnullmasksize;

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Public property bookmarkdata: bookmarkdataty read getbookmarkdata1 write setbookmarkdata1;

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Public property logging: boolean read getlogging;

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Public property filtereditkind: filtereditkindty read ffiltereditkind write ffiltereditkind;

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Public property changecount: integer read getchangecount;

Number of posted, pending (not yet applied) record changes — it only counts changes already in the update buffer, so it stays 0 for the current record until it is posted; use Modified to check the current, not yet posted record.

Public property changerecords: recupdateinfoarty read getchangerecords;

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Public property applyerrorcount: integer read getapplyerrorcount;

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Public property applyerrorrecords: recupdateinfoarty read getapplyerrorrecords;

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Public property appliedcount: card32 read fappliedcount;

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Public property recnozerobased: int32 read getrecnozerobased write setrecnozerobased;

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Public property currentisnull[const afield: tfield; aindex: integer]: boolean read getcurrentisnull;

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Public property currentasvariant[const afield: tfield; aindex: integer]: variant read getcurrentasvariant write setcurrentasvariant;

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Public property currentasboolean[const afield: tfield; aindex: integer]: boolean read getcurrentasboolean write setcurrentasboolean;

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Public property currentasinteger[const afield: tfield; aindex: integer]: integer read getcurrentasinteger write setcurrentasinteger;

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Public property currentaslargeint[const afield: tfield; aindex: integer]: int64 read getcurrentaslargeint write setcurrentaslargeint;

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Public property currentasid[const afield: tfield; aindex: integer]: int64 read getcurrentasid write setcurrentasid;

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Public property currentasfloat[const afield: tfield; aindex: integer]: double read getcurrentasfloat write setcurrentasfloat;

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Public property currentasdatetime[const afield: tfield; aindex: integer]: tdatetime read getcurrentasdatetime write setcurrentasdatetime;

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Public property currentascurrency[const afield: tfield; aindex: integer]: currency read getcurrentascurrency write setcurrentascurrency;

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Public property currentasmsestring[const afield: tfield; aindex: integer]: msestring read getcurrentasmsestring write setcurrentasmsestring;

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Public property currentasguid[const afield: tfield; aindex: integer]: tguid read getcurrentasguid write setcurrentasguid;

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Public property currentbmisnull[const afield: tfield; const abm: bookmarkdataty]: boolean read getcurrentbmisnull;

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Public property currentbmasvariant[const afield: tfield; const abm: bookmarkdataty]: variant read getcurrentbmasvariant write setcurrentbmasvariant;

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Public property currentbmasboolean[const afield: tfield; const abm: bookmarkdataty]: boolean read getcurrentbmasboolean write setcurrentbmasboolean;

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Public property currentbmasinteger[const afield: tfield; const abm: bookmarkdataty]: integer read getcurrentbmasinteger write setcurrentbmasinteger;

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Public property currentbmaslargeint[const afield: tfield; const abm: bookmarkdataty]: int64 read getcurrentbmaslargeint write setcurrentbmaslargeint;

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Public property currentbmasid[const afield: tfield; const abm: bookmarkdataty]: int64 read getcurrentbmasid write setcurrentbmasid;

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Public property currentbmasfloat[const afield: tfield; const abm: bookmarkdataty]: double read getcurrentbmasfloat write setcurrentbmasfloat;

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Public property currentbmasdatetime[const afield: tfield; const abm: bookmarkdataty]: tdatetime read getcurrentbmasdatetime write setcurrentbmasdatetime;

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Public property currentbmascurrency[const afield: tfield; const abm: bookmarkdataty]: currency read getcurrentbmascurrency write setcurrentbmascurrency;

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Public property currentbmasmsestring[const afield: tfield; const abm: bookmarkdataty]: msestring read getcurrentbmasmsestring write setcurrentbmasmsestring;

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Public property currentbmasguid[const afield: tfield; const abm: bookmarkdataty]: tguid read getcurrentbmasguid write setcurrentbmasguid;

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Public property delayedapplycount: integer read fdelayedapplycount write setdelayedapplycount default 0;

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Published property options: bufdatasetoptionsty read foptions write setoptions default [];

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Published property logfilename: filenamety read flogfilename write flogfilename;

Log file for bdo_local mode. A log file becomes invalid, with no exception raised, if the dataset's field structure changes after it was written — delete stale log files after changing fields, don't reuse one written by a previous version of the application.

Published property cryptohandler: tcustomcryptohandler read fcryptohandler write setcryptohandler;

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Published property packetrecords : integer read fpacketrecords write setpacketrecords default defaultpacketrecords;

Records are fetched from the database in packets of this size (a negative value fetches all records at once, the default). Right after Open, RecordCount only reflects the first fetched packet — call Last (which fetches every remaining record, and so can be slow on a large result set) if the real total count is needed.

Published property indexlocal: tlocalindexes read findexlocal write setindexlocal;

Memo and blob field values are not stored in the record buffer but fetched on demand, so they can not be used as index fields here — do any needed type conversion (e.g. to a fixed-length string) in the SQL select statement instead.

Published property onupdateerror: updateerroreventty read fonupdateerror write setonupdateerror;

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Published property oninternalcalcfields: internalcalcfieldseventty read foninternalcalcfields write setoninternalcalcfields;

Fires with fetching True right after a record is fetched from the database, and with fetching False right before a record is posted — the place to compute fkinternalcalc fields, which, unlike fkcalculated fields, are never read from or written to the database and can also be set directly in code (e.g. from an edit widget), like fkdata fields.

Published property beforeapplyupdate: tdatasetnotifyevent read fbeforeapplyupdate write fbeforeapplyupdate;

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Published property afterapplyupdate: tdatasetnotifyevent read fafterapplyupdate write fafterapplyupdate;

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Published property beforebeginfilteredit: filterediteventty read fbeforebeginfilteredit write fbeforebeginfilteredit;

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Published property afterbeginfilteredit: filterediteventty read fafterbeginfilteredit write fafterbeginfilteredit;

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Published property beforeendfilteredit: filterediteventty read fbeforeendfilteredit write fbeforeendfilteredit;

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Published property afterendfilteredit: filterediteventty read fafterendfilteredit write fafterendfilteredit;

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Published property beforefilterchanged: bufdataseteventty read fbeforefilterchanged write fbeforefilterchanged;

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Published property afterfilterchanged: bufdataseteventty read fafterfilterchanged write fafterfilterchanged;

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Published property Active default false;

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