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SHOW PROCEDURE CODEproc_name

This statement is a MySQL extension that is available only for servers that have been built with debugging support. It displays a representation of the internal implementation of the named stored procedure. A similar statement,SHOW FUNCTION CODE, displays information about stored functions (seeSection 15.7.7.20, “SHOW FUNCTION CODE Statement”).

To use either statement, you must be the user named as the routineDEFINER, have theSHOW_ROUTINE privilege, or have theSELECT privilege at the global level.

If the named routine is available, each statement produces a result set. Each row in the result set corresponds to one“instruction” in the routine. The first column isPos, which is an ordinal number beginning with 0. The second column isInstruction, which contains an SQL statement (usually changed from the original source), or a directive which has meaning only to the stored-routine handler.

mysql> DELIMITER //mysql> CREATE PROCEDURE p1 ()       BEGIN         DECLARE fanta INT DEFAULT 55;         DROP TABLE t2;         LOOP           INSERT INTO t3 VALUES (fanta);           END LOOP;         END//Query OK, 0 rows affected (0.01 sec)mysql> SHOW PROCEDURE CODE p1//+-----+----------------------------------------+| Pos | Instruction                            |+-----+----------------------------------------+|   0 | set fanta@0 55                         ||   1 | stmt 9 "DROP TABLE t2"                 ||   2 | stmt 5 "INSERT INTO t3 VALUES (fanta)" ||   3 | jump 2                                 |+-----+----------------------------------------+4 rows in set (0.00 sec)mysql> CREATE FUNCTION test.hello (s CHAR(20))       RETURNS CHAR(50) DETERMINISTIC       RETURN CONCAT('Hello, ',s,'!');Query OK, 0 rows affected (0.00 sec)mysql> SHOW FUNCTION CODE test.hello;+-----+---------------------------------------+| Pos | Instruction                           |+-----+---------------------------------------+|   0 | freturn 254 concat('Hello, ',s@0,'!') |+-----+---------------------------------------+1 row in set (0.00 sec)

In this example, the nonexecutableBEGIN andEND statements have disappeared, and for theDECLAREvariable_name statement, only the executable part appears (the part where the default is assigned). For each statement that is taken from source, there is a code wordstmt followed by a type (9 meansDROP, 5 meansINSERT, and so on). The final row contains an instructionjump 2, meaningGOTO instruction #2.