SHOW TRIGGERS [{FROM | IN} db_name]
[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 if you have the
SUPER privilege. It was
implemented in MySQL 5.0.10. The
LIKE clause, if present, indicates
which table 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 19.18, “Extensions to SHOW Statements”.
For the trigger ins_sum as defined in
Section 18.3, “Using Triggers”, the output of this statement is as
shown here:
mysql> SHOW TRIGGERS LIKE 'acc%'\G
*************************** 1. row ***************************
Trigger: ins_sum
Event: INSERT
Table: account
Statement: SET @sum = @sum + NEW.amount
Timing: BEFORE
Created: NULL
sql_mode:
Definer: myname@localhost
When using a LIKE clause with
SHOW TRIGGERS, the expression
to be matched (expr) is compared
with the name of the table on which the trigger is declared,
and not with the name of the trigger:
mysql> SHOW TRIGGERS LIKE 'ins%';
Empty set (0.01 sec)
A brief explanation of the columns in the output of this statement is shown here:
Trigger
The name of the trigger.
Event
The event that causes trigger activation: one of
'INSERT', 'UPDATE', or
'DELETE'.
Table
The table for which the trigger is defined.
Statement
The statement to be executed when the trigger is activated.
This is the same as the text shown in the
ACTION_STATEMENT column of
INFORMATION_SCHEMA.TRIGGERS.
Timing
One of the two values 'BEFORE' or
'AFTER'.
Created
Currently, the value of this column is always
NULL.
The SQL mode in effect when the trigger executes. This column was added in MySQL 5.0.11.
Definer
The account that created the trigger. This column was added in MySQL 5.0.17.
You must have the SUPER privilege
to execute SHOW TRIGGERS.
See also Section 19.15, “The INFORMATION_SCHEMA TRIGGERS Table”.