Tips to change your MySQL Procedure through command shell

Drop your procedure before modifications

There is no alter command like table alter in mysql for modifying your MySQL procedure code. So you have to drop your procedure and then create the same procedure for altering your procedure. To drop the procedure, execute the following line of code in your command shell:

Note: Mysql ALTER PROCEDURE can be used to change the characteristics of a stored procedure only, not the parameters or body of the procedure.

Change the delimiter

Normally body of the procedure consists of semicolons (;) for the end of the line (statement). To execute the procedure as a single statement, you have to change the delimiter for the console (command line interface). You can change the delimiter to ‘/’ by executing the code below:

Execute the CREATE PROCEDURE code

Now you can type/copy your procedure code. An example procedure code is given below for your reference:

Note the last line of the procedure code. Your procedure will get executed only when you add the changed delimiter  / . If there are no issues with your code, your procedure will add successfully to the server.

Change to delimiter back to normal

You already added the procedure to the database, but make sure that you changed your delimiter back to the normal. Execute the following code for changing the delimiter to the default semicolon.

 

MySQL Delete Statement – Confusing Syntax Error when writes in one line

While writing mysql statements in your procedure, you may notice that the workbench will give you a syntax error warning when you states an error free delete statement as below:

The solution is simple, you have to split your statement in two lines. I was not able to find any document which specifies this scenario, but on every document, the delete statements are split into two lines. So the previous statement can be inserted to your procedure as:

Hope you enjoyed this tip. Please give you feedback as comments below.