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13.7.6.38 SHOW TRIGGERS Syntax

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  1. SHOW TRIGGERS
  2.     [{FROM | IN} db_name]
  3.     [LIKE 'pattern' | WHERE expr]

SHOW TRIGGERS lists the triggers currently defined for tables in a database (the default database unless a FROM clause is given). This statement returns results only for databases and tables for which you have the TRIGGER privilege. The LIKE clause, if present, indicates which table names (not trigger names) to match and causes the statement to display triggers for those tables. The WHERE clause can be given to select rows using more general conditions, as discussed in Section 25.41, “Extensions to SHOW Statements”.

For the ins_sum trigger defined in Section 24.3, “Using Triggers”, the output of SHOW TRIGGERS is as shown here:

  1. mysql> SHOW TRIGGERS LIKE 'acc%'\G
  2. *************************** 1. row ***************************
  3.              Trigger: ins_sum
  4.                Event: INSERT
  5.                Table: account
  6.            Statement: SET @sum = @sum + NEW.amount
  7.               Timing: BEFORE
  8.              Created: 2018-08-08 10:10:12.61
  9.             sql_mode: ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,
  10.                       NO_ZERO_IN_DATE,NO_ZERO_DATE,
  11.                       ERROR_FOR_DIVISION_BY_ZERO,
  12.                       NO_ENGINE_SUBSTITUTION
  13.              Definer: me@localhost
  14. character_set_client: utf8mb4
  15. collation_connection: utf8mb4_0900_ai_ci
  16.   Database Collation: utf8mb4_0900_ai_ci

SHOW TRIGGERS output has these columns:

  • Trigger

    The name of the trigger.

  • Event

    The trigger event. This is the type of operation on the associated table for which the trigger activates. The value is INSERT (a row was inserted), DELETE (a row was deleted), or UPDATE (a row was modified).

  • Table

    The table for which the trigger is defined.

  • Statement

    The trigger body; that is, the statement executed when the trigger activates.

  • Timing

    Whether the trigger activates before or after the triggering event. The value is BEFORE or AFTER.

  • Created

    The date and time when the trigger was created. This is a TIMESTAMP(2) value (with a fractional part in hundredths of seconds) for triggers.

  • sql_mode

    The SQL mode in effect when the trigger was created, and under which the trigger executes. For the permitted values, see Section 5.1.11, “Server SQL Modes”.

  • Definer

    The account of the user who created the trigger, in 'user_name'@'host_name' format.

  • character_set_client

    The session value of the character_set_client system variable when the trigger was created.

  • collation_connection

    The session value of the collation_connection system variable when the trigger was created.

  • Database Collation

    The collation of the database with which the trigger is associated.

Trigger information is also available from the INFORMATION_SCHEMA TRIGGERS table. See Section 25.33, “The INFORMATION_SCHEMA TRIGGERS Table”.


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Document créé le 26/06/2006, dernière modification le 26/10/2018
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