Get All MySQL Triggers for Current Database

Triggers are automatic operations that MySQL performs when something happens in a table, like adding a new record (INSERT), changing a record (UPDATE), or getting rid of a record (DELETE). They come in handy because they can handle repetitive tasks and make sure the info in your database is consistent and accurate without any manual interference.

Listing All Triggers in MySQL

To list all the triggers in MYSQL we use information_schema.triggers table. This table stores the metadata, which means the details like the trigger name, the action it responds to (INSERT, UPDATE, DELETE), and the table it is associated with. Each row in the table will provide details about a trigger.

Syntax

Following is the syntax to view all the triggers in MySQL -

select trigger_schema,trigger_name from information_schema.triggers;

Let us implement the above syntax to get all the trigger names along with schema ?

SELECT trigger_schema,trigger_name 
FROM information_schema.triggers;

Following is the output of the above code ?

This approach provides a complete view of all triggers set up in the database, making it easier to manage and audit trigger configurations. Trigger configurations refer to details of the trigger, such as when it is executed, the table it operates on, and the type of event it responds to (INSERT, UPDATE, DELETE).

View Triggers in Current Database

To view triggers in a specific database, you must first switch to that database, if the database doesn't exist, you can create it and add tables and triggers to demonstrate, and then use the SHOW TRIGGERS statement to list triggers in the current database.

Example

Suppose we have a specific database called 'web', we will switch to that database and use SHOW triggers statement.

Query to display the current database triggers -

USE web;
SHOW TRIGGERS \G;

The \G command we used in the above is to format the MySQL query results vertically, displaying each field on a separate line. It's especially useful for viewing long or complex data with SHOW TRIGGERS.

Following is the output of the above code ?

*************************** 1. row ***************************
             Trigger: insertDate
               Event: INSERT
               Table: demo
           Statement: SET NEW.DueDate = CURDATE()
              Timing: BEFORE
             Created: 2024-11-20 09:41:11.29
            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: root@localhost
character_set_client: cp850
collation_connection: cp850_general_ci
  Database Collation: utf8mb4_0900_ai_ci
1 row in set (0.00 sec)

This will allow you to easily find and control all triggers present in the current database.

Benefits of Listing MySQL Triggers

Knowing how to list MySQL triggers is useful because it helps you:

• Automated Processes: We will get to know the triggers which are active, and what actions they perform.

• Troubleshooting: If something unexpected happens in the database we can easily spot and fix them.

• Stay Organized: We can monitor all the triggers and check if they are doing their job right.

• Save Time: We can easily look for the triggers without manually checking them in the entire database setup.

This makes it easier to handle our database and helps us to keep data correct and consistent.

Conclusion

By using the "information_schema.triggers" table and "SHOW Triggers" you can effectively manage and monitor MySQL Triggers. These queries make it easy to view and handle all of your MySQL triggers or certain ones facilitating better database oversight and integrity building in the database more feasible.