What is the role of mysql using stored procedures?

The functions of mysql using stored procedures: 1. Enhance the function and flexibility of SQL statements; 2. Reduce network traffic, thereby reducing network load; 3. Improve database access efficiency; 4. Improve database security reliability and data integrity; 5. Make data independent and achieve decoupling effect.

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A stored procedure is a set of SQL statements designed to complete a specific function gather. The purpose of using stored procedures is to pre-write common or complex work with SQL statements and store them with a specified name. This procedure is compiled and optimized and stored in the database server, so it is called a stored procedure. When you need the database to provide the same service as the defined stored procedure in the future, you only need to call "CALL stored procedure name" to automatically complete it.

SQL statements commonly used to operate the database need to be compiled first and then executed when executed. Stored procedures take another approach to executing SQL statements.

A stored procedure is a programmable function that is created and saved in the database. It generally consists of SQL statements and some special control structures. Stored procedures are particularly suitable when you want to perform the same specific function on different applications or platforms.

MySQL 5.0 version did not support stored procedures before, which greatly reduced the application of MySQL. MySQL has supported stored procedures since version 5.0, which not only improves the processing speed of the database, but also improves the flexibility of database programming.

Stored procedures are an important function in the database. Stored procedures can be used to convert data, It is similar to a programming language for data migration and report making. Once executed successfully, it can be called at any time to complete specified functional operations.

Using stored procedures can not only improve the efficiency of database access, but also improve the security of database use.

For the caller, the stored procedure encapsulates the SQL statement, and the caller does not need to consider the specific implementation process of the logical function. Just a simple call, it can be called from programming languages ​​such as Java and C#.

Writing stored procedures requires slightly higher requirements for developers, but this does not affect the common use of stored procedures, because stored procedures have the following advantages:

1) Encapsulation

Usually multiple SQL statements are required to complete a logical function, and parameters are likely to be passed between each statement. Therefore, writing logical functions is relatively complicated, and stored procedures can include these SQL statements into an independent unit. The complex SQL statements cannot be seen by the outside world, and only simple calls are needed to achieve the purpose. And database professionals can modify the stored procedure at any time without affecting the source code of the application that calls it.

2) Can enhance the function and flexibility of SQL statements

Stored procedures can be written using flow control statements, which have strong flexibility and can complete complex judgments and more complex operations.

3) Can reduce network traffic

Because the stored procedure is run on the server side and the execution speed is fast, when the stored procedure is called on the client computer, only the Call statements, thereby reducing network load.

4) High performance

When the stored procedure is successfully compiled, it is stored in the database server. The client can call it directly in the future, so that all SQL statements will be executed from the server, thus Improve performance. However, it should be noted that the more stored procedures, the better. Excessive use of stored procedures will actually affect system performance.

5) Improve the security of the database and the integrity of the data

One way to improve the security of stored procedures is to use them as intermediate components. The stored procedures can perform related operations on certain tables. , and then the stored procedure is provided as an interface to external programs. In this way, external programs cannot directly operate database tables and can only operate corresponding tables through stored procedures. Therefore, security can be improved to a certain extent.

6) Make data independent

The independence of data can achieve the effect of decoupling, that is to say, the program can call stored procedures to replace executing multiple SQL statements. In this case, the stored procedure isolates the data from the user. The advantage is that when the structure of the data table changes, there is no need to modify the program when calling the table. The database administrator only needs to rewrite the stored procedure.

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