Advantages: 1. Helps improve application performance; 2. Helps reduce traffic between the application and the database server; 3. It is reusable and transparent to any application; 4 , It can improve the security of the database and the integrity of the data; 5. It can make the data independent. Disadvantages: 1. If many stored procedures are used, the memory usage of each connection using these stored procedures will increase significantly; 2. The structure of the stored procedures is not designed for developing complex and flexible business logic; 3. Debugging Stored procedures are difficult; 4. It is not easy to develop and maintain stored procedures.
The operating environment of this tutorial: windows7 system, mysql8 version, Dell G3 computer.
Definition of stored procedure
A stored procedure is a declarative SQL statement stored in the database directory. Stored procedures can be called by triggers, other stored procedures, and applications such as Java, Python, PHP, etc.
The stored procedure that calls itself is called a recursive stored procedure. Most database management systems support recursive stored procedures. However, MySQL does not support it. Before implementing recursive stored procedures in MySQL, you should check the version of your MySQL database.
Stored Procedures in MySQL
MySQL is known as the most popular open source RDBMS and it is widely used by communities and enterprises. However, for the first decade of its existence, it did not support stored procedures, stored functions, triggers, and events. Starting with MySQL 5.0, these features were added to the MySQL database engine, making it more flexible and powerful.
Advantages of MySQL stored procedures
Usually stored procedures help improve application performance.
Once created, the stored procedure is compiled and stored in the database. However, MySQL implements stored procedures slightly differently. MySQL stored procedures are compiled on demand. After compiling the stored procedure, MySQL puts it into cache and maintains its own cache of stored procedures for each connection. If the application uses the stored procedure multiple times in a single connection, use the compiled version, otherwise the stored procedure works like a query.
Stored procedures help reduce traffic between the application and the database server because the application must send only the name and parameters of the stored procedure instead of sending multiple lengthy SQL statements .
Stored procedures are reusable and transparent to any application. Stored procedures expose the database interface to all applications so that developers do not have to develop functionality that is already supported in stored procedures.
Improve database security and data integrity.
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 procedures are provided as interfaces 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.
Make data independent.
The independence of data can achieve the effect of decoupling, that is to say, the program can call stored procedures instead of 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.
In addition to these advantages, stored procedures also have their own disadvantages that should be noted before using them in a database.
Disadvantages of MySQL stored procedures
If you use many stored procedures, the memory usage of each connection using these stored procedures will be significant. increasing. Furthermore, if you overuse a large number of logical operations in a stored procedure, the CPU usage will increase because the database server is not well designed for logical operations.
The construct of stored procedures is not designed for developing complex and flexible business logic.
Debugging stored procedures is difficult. Only a few database management systems allow you to debug stored procedures. Unfortunately, MySQL does not provide tools for debugging stored procedures.
Developing and maintaining stored procedures is not easy. Developing and maintaining stored procedures often requires a specialized skill set that not all application developers possess. This can cause problems during application development and maintenance phases.
MySQL stored procedures have their own advantages and disadvantages. When developing an application, you should decide whether to use stored procedures based on the application's architecture.
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