Shantanu's Blog

Corporate Consultant

June 22, 2011

 

Triggers management

List of all triggers:
SELECT TRIGGER_SCHEMA AS Database_Name, EVENT_OBJECT_TABLE AS Table_Name,
REPLACE(group_concat(IF(EVENT_MANIPULATION = 'UPDATE' AND ACTION_TIMING='BEFORE', TRIGGER_NAME, '')), ',', '') AS BEFORE_UPDATE,
REPLACE(group_concat(IF(EVENT_MANIPULATION = 'UPDATE' AND ACTION_TIMING = 'AFTER', TRIGGER_NAME, '')), ',', '') AS AFTER_UPDATE,
REPLACE(group_concat(IF(EVENT_MANIPULATION = 'INSERT' AND ACTION_TIMING='BEFORE', TRIGGER_NAME, '')), ',', '') AS BEFORE_INSERT,
REPLACE(group_concat(IF(EVENT_MANIPULATION = 'INSERT' AND ACTION_TIMING = 'AFTER', TRIGGER_NAME, '')), ',', '') AS AFTER_INSERT,
REPLACE(group_concat(IF(EVENT_MANIPULATION = 'DELETE' AND ACTION_TIMING='BEFORE', TRIGGER_NAME, '')), ',', '') AS BEFORE_DELETE,
REPLACE(group_concat(IF(EVENT_MANIPULATION = 'DELETE' AND ACTION_TIMING = 'AFTER', TRIGGER_NAME, '')), ',', '') AS AFTER_DELETE
from information_schema.triggers GROUP BY TRIGGER_SCHEMA, EVENT_OBJECT_TABLE ;


Remove all triggers:
select concat('drop trigger if exists `',trigger_schema,'`.`',trigger_name,'`;') cmd from information_schema.triggers
where trigger_schema='test';

Disable all AFTER triggers:
mysql -uroot -proot@123 -Bse"SELECT IF(ACTION_TIMING = 'AFTER', CONCAT('mv /var/lib/mysql/', TRIGGER_SCHEMA, '/', EVENT_OBJECT_TABLE, '.TRG', ' ', ' /var/lib/mysql/', TRIGGER_SCHEMA, '/', EVENT_OBJECT_TABLE, '.TRG.bak' ), '') AS Backup from information_schema.triggers GROUP BY TRIGGER_SCHEMA, EVENT_OBJECT_TABLE " | sh


Disable all triggers:
find `grep datadir /etc/my.cnf | awk -F'=' '{print $2}'` -name "*.TRG" | xargs -i mv {} {}.bak

Enable all Triggers:
find `grep datadir /etc/my.cnf | awk -F'=' '{print $2}'` -name "*.TRG.bak" | xargs -i rename '.bak' '' {}


// following trigger will dump each trigger from selected dbName into a separate file.

#!/bin/sh
dbName=${1:-'default_db'}
host='10.10.10.10'
user='root'
password='root@123'
port='3311'
mysql -u$user -p$password -h$host -P$port -Bse"SELECT TRIGGER_NAME FROM information_schema.triggers WHERE TRIGGER_SCHEMA = '$dbName' ;" | while read -r trigName

do
echo $trigName
mysql -u$user -p$password -h$host -P$port -Bse"select sql_code from mysql.SHOW_CREATE_TRIGGERS where TRIGGER_SCHEMA='$dbName' AND trigger_name = \"$trigName\"\G" > $trigName.sql
done

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June 06, 2011

 

definers in triggers and procedures

The stored procedures and triggers have the "definer" clause that keeps the non-privileged users from accessing these objects. But most often it is a problem since the trigger won't work unless the user is present. The update/ insert statements will fail if the respective triggers can not be activated. The only way is to find and create required users.

mysql> select DEFINER from information_schema.TRIGGERS AS a
LEFT JOIN mysql.user AS b ON a.DEFINER = CONCAT(User, '@', Host) WHERE CONCAT(uSER, '@', Host) IS NULL group by a.DEFINER;
+---------------------+
| DEFINER |
+---------------------+
| ABC@199.168.101.% |
+---------------------+
1 row in set (1.41 sec)

mysql> select DEFINER from information_schema.ROUTINES AS a
LEFT JOIN mysql.user AS b ON a.DEFINER = CONCAT(User, '@', Host) WHERE CONCAT(uSER, '@', Host) IS NULL group by a.DEFINER;
+-----------------------+
| DEFINER |
+-----------------------+
| MNP@199.168.100.% |
| companycuser@ |
+-----------------------+
2 rows in set (0.02 sec)

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