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MySQL 9.3 Reference Manual  / ...  / INFORMATION_SCHEMA Tables  / INFORMATION_SCHEMA General Tables  /  The INFORMATION_SCHEMA TRIGGERS Table

28.3.46 The INFORMATION_SCHEMA TRIGGERS Table

TheTRIGGERS table provides information about triggers. To see information about a table's triggers, you must have theTRIGGER privilege for the table.

TheTRIGGERS table has these columns:

  • TRIGGER_CATALOG

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

  • 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 isINSERT (a row was inserted),DELETE (a row was deleted), orUPDATE (a row was modified).

  • EVENT_OBJECT_CATALOG,EVENT_OBJECT_SCHEMA, andEVENT_OBJECT_TABLE

    As noted inSection 27.4, “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. TheEVENT_OBJECT_CATALOG value is alwaysdef.

  • ACTION_ORDER

    The ordinal position of the trigger's action within the list of triggers on the same table with the sameEVENT_MANIPULATION andACTION_TIMING values.

  • ACTION_CONDITION

    This value is alwaysNULL.

  • 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 alwaysROW.

  • ACTION_TIMING

    Whether the trigger activates before or after the triggering event. The value isBEFORE orAFTER.

  • ACTION_REFERENCE_OLD_TABLE

    This value is alwaysNULL.

  • ACTION_REFERENCE_NEW_TABLE

    This value is alwaysNULL.

  • ACTION_REFERENCE_OLD_ROW andACTION_REFERENCE_NEW_ROW

    The old and new column identifiers, respectively. TheACTION_REFERENCE_OLD_ROW value is alwaysOLD and theACTION_REFERENCE_NEW_ROW value is alwaysNEW.

  • CREATED

    The date and time when the trigger was created. This is aTIMESTAMP(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, seeSection 7.1.11, “Server SQL Modes”.

  • DEFINER

    The account named in theDEFINER clause (often the user who created the trigger), in'user_name'@'host_name' format.

  • CHARACTER_SET_CLIENT

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

  • COLLATION_CONNECTION

    The session value of thecollation_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 theins_sum trigger defined inSection 27.4, “Using Triggers”:

mysql> SELECT * FROM INFORMATION_SCHEMA.TRIGGERS       WHERE TRIGGER_SCHEMA='test' AND TRIGGER_NAME='ins_sum'\G*************************** 1. row ***************************           TRIGGER_CATALOG: def            TRIGGER_SCHEMA: test              TRIGGER_NAME: ins_sum        EVENT_MANIPULATION: INSERT      EVENT_OBJECT_CATALOG: def       EVENT_OBJECT_SCHEMA: test        EVENT_OBJECT_TABLE: account              ACTION_ORDER: 1          ACTION_CONDITION: NULL          ACTION_STATEMENT: SET @sum = @sum + NEW.amount        ACTION_ORIENTATION: ROW             ACTION_TIMING: BEFOREACTION_REFERENCE_OLD_TABLE: NULLACTION_REFERENCE_NEW_TABLE: NULL  ACTION_REFERENCE_OLD_ROW: OLD  ACTION_REFERENCE_NEW_ROW: NEW                   CREATED: 2018-08-08 10:10:12.61                  SQL_MODE: ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,                            NO_ZERO_IN_DATE,NO_ZERO_DATE,                            ERROR_FOR_DIVISION_BY_ZERO,                            NO_ENGINE_SUBSTITUTION                   DEFINER: me@localhost      CHARACTER_SET_CLIENT: utf8mb4      COLLATION_CONNECTION: utf8mb4_0900_ai_ci        DATABASE_COLLATION: utf8mb4_0900_ai_ci

Trigger information is also available from theSHOW TRIGGERS statement. SeeSection 15.7.7.41, “SHOW TRIGGERS Statement”.