Can a trigger be moved to a stored procedure in MySQL?

Can a trigger be moved to a stored procedure in MySQL?

For MySQL, the triggers are row by row, so it would be an easy solution. Select the data currently in the table, insert it into the logging table, and the update the “version” column in the new data. However, it’s possible to move this logic to a stored procedure.

Do you have to change trigger if row has changed in MySQL?

BUT imagine a large table with changing columns. You have to compare every column and if the database changes you have to adjust the trigger. AND it doesn’t “feel” good to compare every column of the row hardcoded 🙂 MySQL knows that the line didn’t change. But it doesn’t share this knowledge with the trigger.

What happens when you use a trigger in MySQL?

For the sake of simplicity, triggers are the way to go for implementing any kind of tracking of database changes. However, you need to be aware of what happens under the hood when you use triggers. According to MySQL Stored Procedure Programming, page 256 under the head “Trigger Overhead” says the following:

How often does a trigger execute in DML?

The lesson here is this: since the trigger code will execute once for every row affected by a DML statement, the trigger can easily become the most significant factor in DML performance.

What’s the difference between a trigger and a stored procedure?

Stored procedures can be invoked explicitly by the user. It’s like a java program, it can take some input as a parameter then can do some processing and can return values. On the other hand, trigger is a stored procedure that runs automatically when various events happen (eg update, insert, delete).

When are stored routines and triggers parsed in MySQL?

Stored routines and trigger events are parsed when they are executed. Even “dead” code that will never run can significantly affect the performance of bulk operations (e.g. when running this inside the trigger).

Why are stored procedures not supported in MySQL?

Since MySQL started supporting stored procedures, I’ve never really used them. Partly because I’m not a great query writer, partly because I often work with DBAs who make those choices for me, partly because I’m just comfy with What I Know.

How long does a stored procedure take in MySQL?

The intent is to grab a chunk of batch items via a stored procedure identified by a batch job id and restricted to a number of items (size). The query seems to take 1 second initially and then takes consecutively longer with each call to the stored proc.

Can a stored procedure be run against a view?

A stored procedure however you can pass those search parameters in and run the query directly against the underlining (indexed) tables. the downside is the results will need to be fetched every time the procedure is run, which may also occur with a view anyway depending on server configuration.