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借助 SHOW TRIGGERS 語句，我們可以列出特定數(shù)據(jù)庫中的所有觸發(fā)器。可以借助以下示例進行說明 –

示例

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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上面的結果集給出了當前數(shù)據(jù)庫中的觸發(fā)器列表。現(xiàn)在，如果我們想獲取特定數(shù)據(jù)庫中的觸發(fā)器列表，那么我們可以使用以下語句 –

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

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上面的結果集顯示名為“tutorials”的數(shù)據(jù)庫中沒有觸發(fā)器。

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