Unit mselookupbuffer

Description
Classes, Interfaces, Objects and Records
Types
Constants

Description

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Overview

Classes, Interfaces, Objects and Records

Name Description
Interface ilookupbufferfieldinfo  
Class tlookupbufferdatalink  
Class tlookupbufferfieldsdatalink  
Class tlookupbuffermemodatalink  
Record stringindexinfoty  
Record integerindexinfoty  
Record int64indexinfoty  
Record floatindexinfoty  
Class tcustomlookupbuffer Holds several parallel, integer-indexed arrays (of integer, int64, realty — also used for datetimes — and msestring) and lets you search a value in one array and read the corresponding value in another (see the lookup* functions), or search and then walk an array's values (find* and *value* functions).
Class tlookupbuffer  
Class tdatalookupbuffer  
Class tcustomdblookupbuffer  
Class tdblookupbuffer  
Class tdbmemolookupbuffer Like tdblookupbuffer, but each bound DB field is a memo whose text is split into one array row per line, converting each line to the array's type (and from UTF-8 for text fields); integerfields/ floatfields/textfields can therefore name any DB field convertible to the corresponding type, not just fields of that exact type.

Types

lookupbufferfieldnoty = type integer;
lbdatakindty = (...);
lbfiltereventty = procedure(const sender: tcustomlookupbuffer; const physindex: integer; var valid: boolean) of object;
stringindexinfoarty = array of stringindexinfoty;
integerindexinfoarty = array of integerindexinfoty;
int64indexinfoarty = array of int64indexinfoty;
floatindexinfoarty = array of floatindexinfoty;
lookupbufferstatety = (...);
lookupbufferstatesty = set of lookupbufferstatety;
lookupbuffereventty = procedure(const sender: tcustomlookupbuffer) of object;
lbdboptionty = (...);
lbdboptionsty = set of lbdboptionty;

Constants

changeeventtag = 85839;

Description

Types

lookupbufferfieldnoty = type integer;

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lbdatakindty = (...);

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Values
  • lbdk_none
  • lbdk_integer
  • lbdk_int64
  • lbdk_float
  • lbdk_text
lbfiltereventty = procedure(const sender: tcustomlookupbuffer; const physindex: integer; var valid: boolean) of object;

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stringindexinfoarty = array of stringindexinfoty;

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integerindexinfoarty = array of integerindexinfoty;

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int64indexinfoarty = array of int64indexinfoty;

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floatindexinfoarty = array of floatindexinfoty;

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lookupbufferstatety = (...);

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Values
  • lbs_changed
  • lbs_buffervalid
  • lbs_changeeventposted
  • lbs_sourceclosed
lookupbufferstatesty = set of lookupbufferstatety;

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lookupbuffereventty = procedure(const sender: tcustomlookupbuffer) of object;

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lbdboptionty = (...);

olbdb_closedataset opens the dataset (disabling its bound controls) only for the time needed to (re)load the buffer, then closes it again. olbdb_invalidateifmodified marks the buffer invalid as soon as the dataset's data changes, so it is reloaded just before the next access (search, lookup, value read, ...) rather than immediately.

Values
  • olbdb_closedataset
  • olbdb_invalidateifmodified
lbdboptionsty = set of lbdboptionty;

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Constants

changeeventtag = 85839;

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