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25.34 The INFORMATION_SCHEMA TRIGGERS Table

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The TRIGGERS table provides information about triggers. To see information about a table's triggers, you must have the TRIGGER privilege for the table.

The TRIGGERS table has these columns:

  • TRIGGER_CATALOG

    The name of the catalog to which the trigger belongs. This value is always def.

  • TRIGGER_SCHEMA

    The name of the schema (database) to which the trigger belongs.

  • TRIGGER_NAME

    The name of the trigger.

  • EVENT_MANIPULATION

    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).

  • EVENT_OBJECT_CATALOG, EVENT_OBJECT_SCHEMA, and EVENT_OBJECT_TABLE

    As noted in Section 24.3, “Using Triggers”, every trigger is associated with exactly one table. These columns indicate the catalog and schema (database) in which this table occurs, and the table name, respectively. The EVENT_OBJECT_CATALOG value is always def.

  • ACTION_ORDER

    The ordinal position of the trigger's action within the list of triggers on the same table with the same EVENT_MANIPULATION and ACTION_TIMING values.

  • ACTION_CONDITION

    This value is always NULL.

  • ACTION_STATEMENT

    The trigger body; that is, the statement executed when the trigger activates. This text uses UTF-8 encoding.

  • ACTION_ORIENTATION

    This value is always ROW.

  • ACTION_TIMING

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

  • ACTION_REFERENCE_OLD_TABLE

    This value is always NULL.

  • ACTION_REFERENCE_NEW_TABLE

    This value is always NULL.

  • ACTION_REFERENCE_OLD_ROW and ACTION_REFERENCE_NEW_ROW

    The old and new column identifiers, respectively. The ACTION_REFERENCE_OLD_ROW value is always OLD and the ACTION_REFERENCE_NEW_ROW value is always NEW.

  • 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.

Example

The following example uses the ins_sum trigger defined in Section 24.3, “Using Triggers”:

  1. mysql> SELECT * FROM INFORMATION_SCHEMA.TRIGGERS
  2.        WHERE TRIGGER_SCHEMA='test' AND TRIGGER_NAME='ins_sum'\G
  3. *************************** 1. row ***************************
  4.            TRIGGER_CATALOG: def
  5.             TRIGGER_SCHEMA: test
  6.               TRIGGER_NAME: ins_sum
  7.         EVENT_MANIPULATION: INSERT
  8.       EVENT_OBJECT_CATALOG: def
  9.        EVENT_OBJECT_SCHEMA: test
  10.         EVENT_OBJECT_TABLE: account
  11.               ACTION_ORDER: 1
  12.           ACTION_CONDITION: NULL
  13.           ACTION_STATEMENT: SET @sum = @sum + NEW.amount
  14.         ACTION_ORIENTATION: ROW
  15.              ACTION_TIMING: BEFORE
  16. ACTION_REFERENCE_OLD_TABLE: NULL
  17. ACTION_REFERENCE_NEW_TABLE: NULL
  18.   ACTION_REFERENCE_OLD_ROW: OLD
  19.   ACTION_REFERENCE_NEW_ROW: NEW
  20.                    CREATED: 2018-08-08 10:10:12.61
  21.                   SQL_MODE: ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,
  22.                             NO_ZERO_IN_DATE,NO_ZERO_DATE,
  23.                             ERROR_FOR_DIVISION_BY_ZERO,
  24.                             NO_ENGINE_SUBSTITUTION
  25.                    DEFINER: me@localhost
  26.       CHARACTER_SET_CLIENT: utf8mb4
  27.       COLLATION_CONNECTION: utf8mb4_0900_ai_ci
  28.         DATABASE_COLLATION: utf8mb4_0900_ai_ci

Trigger information is also available from the SHOW TRIGGERS statement. See Section 13.7.6.38, “SHOW TRIGGERS Syntax”.


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