Can we call procedure from trigger?
A: Yes, we can call stored procedure inside the trigger. For example: Create PROCEDURE [dbo].
How do you call a procedure inside a trigger in MySQL?
MySQL allows you to call a stored procedure from a trigger by using the CALL statement. By doing this, you can reuse the same stored procedure in several triggers. However, the trigger cannot call a stored procedure that has OUT or INOUT parameters or a stored procedure that uses dynamic SQL.
How do I trigger a stored procedure in SQL Server?
In Object Explorer, connect to an instance of the SQL Server Database Engine, expand that instance, and then expand Databases. Expand the database that you want, expand Programmability, and then expand Stored Procedures. Right-click the user-defined stored procedure that you want and click Execute Stored Procedure.
What is trigger and procedure in MySQL?
A trigger in MySQL is a set of SQL statements that reside in a system catalog. It is a special type of stored procedure that is invoked automatically in response to an event. Each trigger is associated with a table, which is activated on any DML statement such as INSERT, UPDATE, or DELETE.
Can we call triggers explicitly?
We cannot call triggers explicitly. Triggers provide data integrity and are used to access and check data before and after modification using DDL or DML queries.
What is the difference between trigger and stored procedure?
A stored procedure is a user defined piece of code written in the local version of PL/SQL, which may return a value (making it a function) that is invoked by calling it explicitly. A trigger is a stored procedure that runs automatically when various events happen (eg update, insert, delete).
How do you trigger in SQL?
create trigger [trigger_name]: Creates or replaces an existing trigger with the trigger_name. [before | after]: This specifies when the trigger will be executed. {insert | update | delete}: This specifies the DML operation. on [table_name]: This specifies the name of the table associated with the trigger.
Can triggers be enabled or disabled?
Triggers can be re-enabled by using ENABLE TRIGGER. DML triggers defined on tables can be also be disabled or enabled by using ALTER TABLE. Changing the trigger by using the ALTER TRIGGER statement enables the trigger.
How to call a stored procedure from a trigger in MySQL?
MySQL allows you to call a stored procedure from a trigger by using the CALL statement. By doing this, you can reuse the same stored procedure in several triggers. However, the trigger cannot call a stored procedure that has OUT or INOUT parameters or a stored procedure that uses dynamic SQL. Let’s take a look at the following example.
Do you need overhead to call a trigger in MySQL?
Such would be the case if triggers were manipulating tables with INSERTs and UPDATEs being stagnated to perform heavy duty MVCCinside each call to a trigger. Don’t forget that Triggers require overhead. In fact, According to MySQL Stored Procedure Programming, page 256 under the head “Trigger Overhead” says the following:
How often does the trigger code 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 should the code inside a trigger be?
Code inside the trigger body needs to be as lightweight as possible and — in particular — any SQL statements in the trigger should be supported by indexes whenever possible. I explained other nasty aspects of Triggers in an earlier post.