Create a TRIGGER to create a TRIGGER when a table is created

问题

I am interested in creating a TRIGGER that creates a TRIGGER when a table is created.

Poking around in mysql databases, I noticed that the tables for a schema are returned with:

select TABLE_NAME, TABLE_SCHEMA from information_schema.TABLES;

Is the following a proper method to create a TRIGGER, to create a TRIGGER bound to a different schema?

DELIMITER //
CREATE TRIGGER `information_schema`.`argus_table_creation`
    AFTER INSERT on `TABLES`
    BEGIN
        --trigger here
        CREATE TRIGGER `argus`.`after_argus_insert` --create trigger bound to DB 'argus', titled 'after_insert'
        AFTER INSERT ON `argus_table_2013_06_27` FOR EACH ROW -- perform the trigger, `after insert`, on the `argus_table_2013_06_27` table, `for each row` that is inserted.
        BEGIN
                INSERT INTO argus.historic_argus_saddrdaddr(saddr, daddr)
                (
                SELECT saddr, daddr
                FROM (SELECT NEW.saddr, NEW.daddr) as derived
                WHERE NOT EXISTS (SELECT saddr, daddr FROM argus.historic_argus_saddrdaddr where historic_argus_saddrdaddr.saddr = derived.saddr and historic_argus_saddrdaddr.daddr = derived.daddr)
                );
        END//
    END//
DELIMITER;

Reasoning:

I use a client application (rasqlinsert) that automatically creates new tables that match a given naming scheme (where you can utilize strftime(f)). I need to create a trigger on these auto-generated tables as they are generated. This is why I am looking for a solution.

Another possible solution

Is it possible to advise the developer of the software to use a command similar to CREATE TABLE n LIKE x, but have it copy triggers?

P.S. Contacted dev. Will roll change in with 3.0.7.11 to accept arbitrary SQL to perform along with creation of new DB. Expects code to hit dev repo by Monday.

回答1:

You cannot set triggers on tables in the information_schema database.

Can you please provide a citation? – mbrownnyc

http://dev.mysql.com/doc/refman/5.1/en/information-schema.html

MySQL 5.1 Reference Manual

Chapter 20. INFORMATION_SCHEMA Tables

Usage Notes for the INFORMATION_SCHEMA Database

INFORMATION_SCHEMA is a database within each MySQL instance, the place that stores information about all the other databases that the MySQL server maintains. The INFORMATION_SCHEMA database contains several read-only tables. They are actually views, not base tables, so there are no files associated with them, and you cannot set triggers on them.

来源：https://stackoverflow.com/questions/17353080/create-a-trigger-to-create-a-trigger-when-a-table-is-created

标签

mysql

triggers

ddl-trigger