Mysql：Where are stored {procedures | functions | triggers} ? （例程）存储过程、函数、触发器，存在哪儿？

Question 1

A.4.7.

Where are stored procedures stored?

Answer

In the proc table of the mysql system database. However, you should not access the tables in the system database directly. Instead, query the INFORMATION_SCHEMA ROUTINES and PARAMETERS tables. See Section 24.21, “The INFORMATION_SCHEMA ROUTINES Table”, and Section 24.15, “The INFORMATION_SCHEMA PARAMETERS Table”.

You can also use SHOW CREATE FUNCTION to obtain information about stored functions, and SHOW CREATE PROCEDURE to obtain information about stored procedures. See Section 13.7.5.9, “SHOW CREATE PROCEDURE Statement”.

Question 2

A.5.6.

Is there a way to view all triggers in a given database?

Answer

Yes. You can obtain a listing of all triggers defined on database dbname using a query on the INFORMATION_SCHEMA.TRIGGERS table such as the one shown here:

SELECT TRIGGER_NAME, EVENT_MANIPULATION, EVENT_OBJECT_TABLE, ACTION_STATEMENT
    FROM INFORMATION_SCHEMA.TRIGGERS
    WHERE TRIGGER_SCHEMA='dbname';

For more information about this table, see Section 24.29, “The INFORMATION_SCHEMA TRIGGERS Table”.

You can also use the SHOW TRIGGERS statement, which is specific to MySQL. See Section 13.7.5.38, “SHOW TRIGGERS Statement”.

Answer

Triggers are stored in .TRG files, with one such file one per table.

Question 3

A.5.7.

Where are triggers stored?