FIND-FIRST( ) method

Gets a single record. This method lets a user get the first record that satisfies the predicate expression.

Return type:

LOGICAL

Applies to:

Buffer object handle

 

Syntax 

FIND-FIRST ( predicate-expression [ , lockmode [ , wait-mode ] ] )

predicate-expression

A character expression that evaluates to the following syntax:

 

Syntax 

[ WHERE [ logical-expression ] ] [ USE-INDEX index-name ]

Once evaluated, predicate-expression can contain only constants and unabbreviated references to fields from the buffer.

The predicate-expression itself can be built using a concatenation of character expressions.

lockmode

An integer expression evaluating to one of the following constants: SHARE-LOCK, EXCLUSIVE-LOCK, or NO-LOCK. You can assign any of these constants to an integer variable. For example, mylock = NO-LOCK.

The default is SHARE-LOCK.

wait-mode

An integer expression evaluating to one of the following: NO-WAIT, 0, or the Unknown value (?). You can assign NO-WAIT to an integer variable. For example, mywait = NO-WAIT. The default is to wait.

The following shows some examples of FIND-FIRST method:

 

DEFINE VARIABLE bh     AS HANDLE    NO-UNDO. DEFINE VARIABLE myname AS CHARACTER NO-UNDO.   bh = BUFFER Customer:HANDLE.   bh:FIND-FIRST("WHERE Customer.CustNum > 2", NO-LOCK).   DO TRANSACTION:   bh:FIND-FIRST("", EXCLUSIVE-LOCK). END.   bh:FIND-FIRST("WHERE Customer.Name = " + QUOTER(myname) , NO-LOCK).

If FIND-FIRST succeeds, it returns TRUE, otherwise it returns FALSE.

If FIND-FIRST fails, it does not raise an error but displays a message. You can suppress this message by using NO-ERROR on the statement containing the method.

See also:

FIND-BY-ROWID( ) method, FIND-CURRENT( ) method, FIND-LAST( ) method, FIND-UNIQUE( ) method, FIND statement