ASA SQL Reference
  SQL Statements

LOOP statement

Description 

Use this statement to repeat the execution of a statement list.

Syntax 

 [ statement-label : ]
[ WHILE search-condition ] LOOP
     statement-list
END LOOP [ statement-label ]

Usage 

The WHILE and LOOP statements are control statements that allow you to execute a list of SQL statements repeatedly while a search-condition evaluates to TRUE. The LEAVE statement can be used to resume execution at the first statement after the END LOOP.

If the ending statement-label is specified, it must match the beginning statement-label.

Permissions 

None.

Side effects 

None.

See also 

FOR statement

LEAVE statement

Standards and compatibility 

• SQL/92    Persistent Stored Module feature.

• SQL/99    Persistent Stored Module feature.

• Sybase    Not supported in Adaptive Server Enterprise. The WHILE statement provides looping in Transact-SQL stored procedures.

Example 

A While loop in a procedure.

...
SET i = 1;
WHILE i <= 10 LOOP
   INSERT INTO Counters( number ) VALUES ( i );
   SET i = i + 1;
END LOOP;
...

A labeled loop in a procedure.

SET i = 1;
lbl:
LOOP
   INSERT
   INTO Counters( number )
   VALUES ( i );
   IF i >= 10 THEN
      LEAVE lbl;
   END IF;
   SET i = i + 1;
END LOOP lbl