MySQL Tutorial/Procedure Function/Default

Declare variable with default value

   <source lang="sql">

mysql> mysql> delimiter $$ mysql> mysql> CREATE PROCEDURE myProc()

   -> BEGIN
   ->     DECLARE my_pi          FLOAT          /* Floating point number*/
   ->             DEFAULT 3.1415926;            /* initialized as PI */
   ->
   ->     select "my_pi="+my_pi;
   -> END$$

Query OK, 0 rows affected (0.00 sec) mysql> delimiter ; mysql> mysql> call myProc(); +----------------+ | "my_pi="+my_pi | +----------------+ | 3.141592502594 | +----------------+ 1 row in set (0.00 sec) Query OK, 0 rows affected, 1 warning (0.00 sec) mysql> mysql> drop procedure myProc; Query OK, 0 rows affected (0.00 sec) mysql> mysql></source>

Integer variable with default value

   <source lang="sql">

mysql> mysql> delimiter $$ mysql> CREATE PROCEDURE myProc()

   -> BEGIN
   ->
   ->     DECLARE l_int1      INT DEFAULT -2000000;
   ->
   ->     select l_int1;
   ->
   -> END$$

Query OK, 0 rows affected (0.02 sec) mysql> delimiter ; mysql> mysql> call myProc(); +----------+ | l_int1 | +----------+ | -2000000 | +----------+ 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 (0.00 sec) mysql></source>