SQL/MySQL/Procedure Function/Call

Call another function

 
mysql>
mysql> delimiter $$
mysql>
mysql> CREATE FUNCTION isodd(input_number int)
    ->        RETURNS int
    -> BEGIN
    ->         DECLARE v_isodd INT;
    ->
    ->         IF MOD(input_number,2)=0 THEN
    ->                 SET v_isodd=FALSE;
    ->         ELSE
    ->                 SET v_isodd=TRUE;
    ->         END IF;
    ->
    ->         RETURN(v_isodd);
    ->
    -> END$$
Query OK, 0 rows affected (0.01 sec)
mysql>
mysql> CREATE PROCEDURE myProc(aNumber int)
    -> Begin
    ->      IF (isodd(aNumber)) THEN
    ->           SELECT " is odd";
    ->      ELSE
    ->           SELECT " is even";
    ->      END IF;
    -> END$$
Query OK, 0 rows affected (0.02 sec)
mysql>
mysql> delimiter ;
mysql>
mysql>
mysql> call myProc(2);
+----------+
| is even  |
+----------+
|  is even |
+----------+
1 row in set (0.00 sec)
Query OK, 0 rows affected (0.01 sec)
mysql>
mysql> call myProc(1);
+---------+
| is odd  |
+---------+
|  is odd |
+---------+
1 row in set (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> call myProc(4);
+----------+
| is even  |
+----------+
|  is even |
+----------+
1 row in set (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql>
mysql> drop procedure myProc;
Query OK, 0 rows affected (0.00 sec)
mysql> drop function isodd;
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql>

Call another procedure

 
mysql>
mysql> delimiter $$
mysql>
mysql> CREATE PROCEDURE myProc()
    -> BEGIN
    ->
    ->      SELECT "Alpha release of MySQL";
    -> END$$
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> CREATE PROCEDURE myProc1()
    -> BEGIN
    ->
    ->      call myProc();
    -> END$$
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> delimiter ;
mysql>
mysql>
mysql> call myProc1();
+------------------------+
| Alpha release of MySQL |
+------------------------+
| Alpha release of MySQL |
+------------------------+
1 row in set (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> drop procedure myProc;
Query OK, 0 rows affected (0.02 sec)
mysql> drop procedure myProc1;
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql>

Call another procedure to pass the error code

 
mysql>
mysql> delimiter $$
mysql>
mysql> CREATE PROCEDURE myProc()
    ->      MODIFIES SQL DATA
    -> BEGIN
    ->      DECLARE l_status VARCHAR(20);
    ->
    ->     CALL myProc1(l_status);
    ->        IF l_status="Duplicate Entry" THEN
    ->               SELECT CONCAT("Warning: using existing definition for location ") AS warning;
    ->      END IF;
    -> END$$
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> CREATE PROCEDURE myProc1(OUT out_status VARCHAR(30))
    -> BEGIN
    ->    set out_status = "Duplicate Entry";
    -> END$$
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql>
mysql> delimiter ;
mysql> call myProc();
+--------------------------------------------------+
| warning                                          |
+--------------------------------------------------+
| Warning: using existing definition for location  |
+--------------------------------------------------+
1 row in set (0.00 sec)
Query OK, 0 rows affected (0.01 sec)
mysql> drop procedure myProc;
Query OK, 0 rows affected (0.00 sec)
mysql> drop procedure myProc1;
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql>

Call another procedure with parameter

 
mysql>
mysql> delimiter $$
mysql>
mysql> CREATE PROCEDURE myProc(id int)
    -> BEGIN
    ->
    ->      SELECT "in proc"+ id;
    -> END$$
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> CREATE PROCEDURE myProc1()
    -> BEGIN
    ->
    ->      call myProc(1);
    -> END$$
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> delimiter ;
mysql>
mysql> call myProc1();
+---------------+
| "in proc"+ id |
+---------------+
|             1 |
+---------------+
1 row in set (0.00 sec)
Query OK, 0 rows affected, 1 warning (0.02 sec)
mysql>
mysql> drop procedure myProc;
Query OK, 0 rows affected (0.00 sec)
mysql> drop procedure myProc1;
Query OK, 0 rows affected (0.00 sec)
mysql>