VoDbSetLocate Function |  |
Specify the code block for a locate condition.
Namespace: XSharp.RT
Assembly: XSharp.RT (in XSharp.RT.dll) Version: 2.19
SyntaxRequest Example
View Source
TRUE if successful; otherwise, FALSE.
Parameters
- cbForCondition
- Type: Usual
A code block that defines a condition that each record within the scope must meet in order to be processed.
If no scope is specified, cbForCondition changes the default scope to all records.
The code block should contain a logical expression.
It corresponds to the first argument of DBLocate() or VODBLocate().
It is valid until it is overwritten by the next VODBSetLocate().
Return Value
Type: LogicTRUE if successful; otherwise, FALSE.
Remarks
VODBSetLocate() allows you to change the locate condition. Once you issue a LOCATE command, DBLocate(), or VODBLocate(),
you could continue searching but with a different condition.
By default, this function operates on the currently selected work area.
It can be made to operate on an unselected work area by specifying it within an aliased expression This function, however, does not call the error handler and will not, therefore, produce a runtime error message or create an error object if it fails. Thus, it may be important to check the return value to determine if the function succeeded.
the LastRddError property in the runtime state. will contain needed information regarding any error that occurs.
See DbLocate(Usual, Usual, Usual, Usual, Usual, Usual) for more information
It can be made to operate on an unselected work area by specifying it within an aliased expression This function, however, does not call the error handler and will not, therefore, produce a runtime error message or create an error object if it fails. Thus, it may be important to check the return value to determine if the function succeeded.
the LastRddError property in the runtime state. will contain needed information regarding any error that occurs.
See DbLocate(Usual, Usual, Usual, Usual, Usual, Usual) for more information
Examples
The following example shows how to search on two different and independent criteria:
X#
1FUNCTION Locators() AS LOGIC 2 LOCAL cbForCondition, cbWhileCondition, nNext, ; 3 uRecId, lRest 4 USE test 5 cbForCondition := {||Proper(ALLTRIM(Name)) == ; 6 "Charly"} 7 cbWhileCondition := {||TRUE} // Process to EOF 8 nNext := -1 // Scope ALL 9 uRecId := NIL // Leave it at NIL 10 lRest := FALSE // Search from top of file 11 // Search for Charly 12 DBLocate(cbForCondition, cbWhileCondition, ; 13 nNext, uRecId, lRest) 14 ? Found(), RECNO(), Name 15 // Specify a second name; Search for Odile 16 VODBSetLocate({||Proper(ALLTRIM(Name))=="Odile"}) 17 CONTINUE 18 ? Found(), RECNO(), Name 19 DBCloseArea() 20 RETURN Found()
See Also