How to view stored procedures in mysql

MySQL is a relational database management system that supports the function of stored procedures. A stored procedure is an encapsulated SQL code that can be called and executed. It is highly efficient and reusable, and can improve the efficiency and security of the database. This article will introduce stored procedures in MySQL and how to view stored procedures.

1. The concept of stored procedure

A stored procedure is an encapsulated SQL code that can be called and executed. Since it has been pre-compiled, the execution speed is relatively fast. A stored procedure can be regarded as a user-defined function, which contains a series of SQL operations and process control, and can accept parameters and return values. In MySQL, stored procedures are divided into three stages: definition, compilation and execution.

2. Creation and definition of MySQL stored procedures

There are two ways to create stored procedures in MySQL: using the CREATE PROCEDURE statement to create stored procedures and creating stored procedures in MySQL Workbench. These two methods are introduced below.

1. Use the CREATE PROCEDURE statement to create a stored procedure

The creation syntax is as follows:

CREATE [DEFINER = { user | CURRENT_USER }] PROCEDURE sp_name ([proc_parameter[,.. .]])
BEGIN

routine_body

END

Among them, DEFINER is the creator of the specified process, which can be the current user or the specified user; sp_name is the name of the stored procedure; proc_parameter is the stored The parameter list of the procedure; routine_body is the main part of the stored procedure, between BEGIN and END.

For example, create a simple stored procedure to query all records of the students table:

CREATE PROCEDURE select_all_students()
BEGIN

SELECT * FROM students;

END

Among them, the stored procedure name is select_all_students, there are no parameters, and the main part queries all records in the students table.

2. Create a stored procedure in MySQL Workbench

First, select a database in MySQL Workbench, then right-click the database and select "Create Procedure" from the pop-up options. In the "Create Procedure" interface, enter the stored procedure name and parameter list, and then enter the body of the stored procedure. Finally, click Apply to save the stored procedure. MySQL Workbench will automatically create SQL statements and stored procedures. This method is more intuitive and simple, and is suitable for users who are not familiar with MySQL or are not good at writing SQL statements.

3. Viewing MySQL stored procedures

In MySQL, you can use the SHOW PROCEDURE STATUS statement to view the status of all stored procedures. The name of the stored procedure created by the CREATE PROCEDURE statement will be saved in the MySQL stored procedure table. Execute the SHOW PROCEDURE STATUS statement to view the status information of the MySQL stored procedure, including the procedure name, creator, creation time, etc.

For example, query information about all stored procedures:

SHOW PROCEDURE STATUS;

You can also view and edit stored procedures in MySQL Workbench. Select the database in the "Object Browser" of MySQL Workbench, and then click the "Stored Procedures" tab to view all stored procedures in the database. Click the stored procedure name to view the SQL code of the stored procedure in the editing area on the right. Users can modify the stored procedure code and then click "Apply" to save.

4. Conclusion

Stored procedures are an important function of MySQL that can improve the efficiency and security of the database. This article briefly introduces the concept, creation method and viewing method of MySQL stored procedures. Users can create and use stored procedures according to actual needs to improve database performance and security.

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