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PERFORM - Short Reference

Reference

Other versions: 7.31 | 7.40 | 7.54

Syntax

PERFORM { { { subr 
            | {subr|(sname) IN PROGRAM [prog|(pname)] [IF FOUND]} 

            | {n OF subr1 subr2 ...} 

            | {subr(prog) [IF FOUND]} } 

            [TABLES itab1 itab2 ...] 
            [USING a1 a2 ...] 

            [CHANGING a1 a2 ...] } 
        | { ON { {COMMIT [LEVEL idx]} 

               | ROLLBACK } } }. 

Effect

Calls a subroutine.

Additions

Specification of the subroutine

• subr - Subroutine subr from the same program.
• subr|(sname) IN PROGRAM [prog|(pname)] - Static or dynamic specification of a subroutine in another or the current program.
• n OF subr1 subr2 ... - Subroutine n from a list of subroutines.
• subr(prog) - Obsolete: Static specification of a subroutine in another program prog.
• IF FOUND
  Suppresses an exception if the subroutine is not found. .

Specification of the parameter

• TABLES itab1 itab2 ...
  Assigns internal tables itab1, itab2, ...to the table parameters of the same position.
• USING a1 a2 ...
  Assigns current parameters a1, a2, ...to the formal parameters of the same position.
• CHANGING a1 a2 ...
  Assigns current parameters a1, a2, ... to the formal parameters of the same position.

Specification of Execution

• ON COMMIT [LEVEL idx]
  Registers the subroutine for execution with COMMIT WORK, where the execution sequence time can be controlled with LEVEL.
• ON ROLLBACK
  Registers the subroutine for execution with ROLLBACK WORK.