Release 10.1A: OpenEdge Development:
Progress 4GL Reference

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:

[ 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. DEFINE VARIABLE myname AS char. bh = BUFFER customer:HANDLE. bh:FIND-FIRST("where cust-num > 2", NO-LOCK). do transaction ;   bh:FIND-FIRST("", EXCLUSIVE-LOCK). end. bh:FIND-FIRST("where 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