How can we view the list of all triggers in the database?-Mysql Tutorial-php.cn

How can we view the list of all triggers in the database?

王林

Release： 2023-09-16 09:37:02

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How can we view the list of all triggers in the database?

With the help of SHOW TRIGGERS statement we can list all the triggers in a specific database. This can be explained with the help of the following example -

Example

mysql> Show Triggers\G
*************************** 1. row ***************************
  Trigger: trigger_before_delete_sample
    Event: DELETE
    Table: sample
Statement: BEGIN

SET @count = if (@count IS NULL, 1, (@count+1));
INSERT INTO sample_rowaffected values (@count);
END

  Timing: BEFORE
 Created: 2017-11-21 12:31:58.70
sql_mode:

ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERR
OR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
             Definer: root@localhost
character_set_client: cp850
collation_connection: cp850_general_ci
  Database Collation: latin1_swedish_ci
*************************** 2. row ***************************
  Trigger: before_inser_studentage
    Event: INSERT
    Table: student_age
Statement: IF NEW.age < 0 THEN SET NEW.age = 0;
END IF
  Timing: BEFORE
 Created: 2017-11-21 11:26:15.34
sql_mode:

ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERR
OR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

             Definer: root@localhost
character_set_client: cp850
collation_connection: cp850_general_ci
  Database Collation: latin1_swedish_ci
2 rows in set (0.01 sec)

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The above result set gives the list of triggers in the current database. Now, if we want to get the list of triggers in a specific database, then we can use the following statement -

mysql> Show Triggers from tutorials\G
Empty set (0.00 sec)

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The above result set shows that there are no triggers in the database named "tutorials".

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