How do I find out if a procedure or function exists in a mysql database?

Question

How do I find out if a procedure or function exists in a mysql database? and is there any discovery option? like a show procedures; (e.g. like show tables;)

Answer 1

SHOW PROCEDURE STATUS
SHOW FUNCTION STATUS

See related StackOverflow question.

Answer 2

A generic answer to this type of question is that all MySQL databases include a database called information_schema which includes all the metadata as tables you can just query.

The information you want is in a table called ROUTINES. For example:

SELECT ROUTINE_NAME 
FROM INFORMATION_SCHEMA.ROUTINES 
WHERE 
       ROUTINE_TYPE="PROCEDURE" 
   AND ROUTINE_SCHEMA="dbname"
;

Answer 3

use the following function:

DELIMITER $$

DROP FUNCTION IF EXISTS f_exists_procedure;$$
CREATE FUNCTION f_exists_procedure(in_name VARCHAR(255))
RETURNS BIT DETERMINISTIC
BEGIN
    SELECT COUNT(1) INTO @f_result
    FROM information_schema.ROUTINES as info
    WHERE info.ROUTINE_SCHEMA = DATABASE() AND info.ROUTINE_TYPE = 'PROCEDURE' AND info.ROUTINE_NAME = in_name;

    RETURN @f_result;

END;$$

DELIMITER ;

Answer 4

Spin Off of the answer from Gaius

SELECT IF( COUNT(*) = 0, 'F' , 'T' ) AS ProcedureExists
FROM INFORMATION_SCHEMA.ROUTINES 
WHERE ROUTINE_SCHEMA = 'someDBName'
AND ROUTINE_TYPE = 'PROCEDURE'
AND UCASE(ROUTINE_NAME) = UCASE('someProcedureName');

Answer 5

Another latest way:

    SHOW CREATE PROCEDURE <procedure_name> ;

Answer 6

If you just want one specific procedure:

SHOW PROCEDURE STATUS WHERE `name` = 'value'