SQL/MySQL/Procedure Function/Function Data Dictionary

Select information from the mysql.proc table and get all the underlying data.

 
mysql>
mysql>
mysql> DELIMITER //
mysql>
mysql> CREATE FUNCTION myFunction (item_sum DECIMAL(10,2))
    -> RETURNS DECIMAL(10,1)
    -> BEGIN
    ->
    ->
    -> RETURN ROUND(item_sum,1);
    ->
    -> END
    -> //
Query OK, 0 rows affected (0.00 sec)
mysql> DELIMITER ;
mysql>
mysql> select myFunction(123.12);
+--------------------+
| myFunction(123.12) |
+--------------------+
|              123.1 |
+--------------------+
1 row in set (0.00 sec)
mysql>
mysql>
mysql>
mysql> SELECT * FROM mysql.proc WHERE name = "myFunction"\G
*************************** 1. row ***************************
              db: test
            name: myFunction
            type: FUNCTION
   specific_name: myFunction
        language: SQL
 sql_data_access: CONTAINS_SQL
is_deterministic: NO
   security_type: DEFINER
      param_list: item_sum DECIMAL(10,2)
         returns: decimal(10,1)
            body: BEGIN
RETURN ROUND(item_sum,1);
END
         definer: root@localhost
         created: 2007-07-23 18:58:39
        modified: 2007-07-23 18:58:39
        sql_mode:
         comment:
1 row in set (0.00 sec)
mysql>
mysql> drop function myFunction;
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql>

To see all of the functions across all databases, use the SHOW FUNCTION STATUS command

 
mysql>
mysql> DELIMITER //
mysql>
mysql> CREATE FUNCTION myFunction (item_sum DECIMAL(10,2))
    -> RETURNS DECIMAL(10,1)
    -> BEGIN
    ->
    ->
    -> RETURN ROUND(item_sum,1);
    ->
    -> END
    -> //
Query OK, 0 rows affected (0.02 sec)
mysql> DELIMITER ;
mysql>
mysql> select myFunction(123.12);
+--------------------+
| myFunction(123.12) |
+--------------------+
|              123.1 |
+--------------------+
1 row in set (0.00 sec)
mysql>
mysql>
mysql> SHOW FUNCTION STATUS\G
*************************** 1. row ***************************
           Db: test
         Name: delivery_day_shipping
         Type: FUNCTION
      Definer: root@localhost
     Modified: 2007-07-23 17:17:21
      Created: 2007-07-23 17:17:21
Security_type: DEFINER
      Comment:
*************************** 2. row ***************************
           Db: test
         Name: myFunction
         Type: FUNCTION
      Definer: root@localhost
     Modified: 2007-07-23 18:58:39
      Created: 2007-07-23 18:58:39
Security_type: DEFINER
      Comment:
2 rows in set (0.01 sec)
mysql>
mysql>
mysql> drop function myFunction;
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql>

Use the SHOW CREATE FUNCTION command

 
mysql>
mysql>
mysql> DELIMITER //
mysql>
mysql> CREATE FUNCTION myFunction (item_sum DECIMAL(10,2))
    -> RETURNS DECIMAL(10,1)
    -> BEGIN
    ->
    ->
    -> RETURN ROUND(item_sum,1);
    ->
    -> END
    -> //
Query OK, 0 rows affected (0.02 sec)
mysql> DELIMITER ;
mysql>
mysql> select myFunction(123.12);
+--------------------+
| myFunction(123.12) |
+--------------------+
|              123.1 |
+--------------------+
1 row in set (0.00 sec)
mysql>
mysql>
mysql>
mysql> SHOW CREATE FUNCTION test.myFunction\G
*************************** 1. row ***************************
       Function: myFunction
       sql_mode:
Create Function: CREATE DEFINER=`root`@`localhost` FUNCTION `myFunction`(item_sum DECIMAL(10,2)) RETURNS decimal(10,1)
BEGIN
RETURN ROUND(item_sum,1);
END
1 row in set (0.00 sec)
mysql>
mysql> drop function myFunction;
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql>