How to call MySQL stored procedures using Java

Java and MySQL are technologies we are familiar with. As an object-oriented language, Java’s main advantages are cross-platform, high readability and high security; MySQL is a free open source relational database. Currently It is widely used in various fields. This article will introduce how to use Java to call MySQL stored procedures.

1. MySQL stored procedures

MySQL stored procedures are procedures created in the database that can perform some predefined tasks. A stored procedure is a collection of precompiled SQL statements that can take parameters. Stored procedures are generally used to perform tasks that need to be performed repeatedly, such as storing data, updating data, deleting data, etc. Creating a MySQL stored procedure is very simple, just use the following command:

CREATE PROCEDURE mysql_store_procedure (IN parameter1 INT, OUT parameter2 INT)

BEGIN

// some sql statements ;

END;

For example, we created a stored procedure named "mysql_store_procedure" that accepts an input parameter of type INT and an output parameter that returns type INT. Inside the stored procedure, we can write SQL statements to process data.

2. Use Java to call MySQL stored procedures

Calling MySQL stored procedures in Java is very simple. We only need to use JDBC to connect to the MySQL database and connect to the stored procedure. Here are the steps:

1. Get the database connection.

Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/yourdatabase", "root", "password");

2. Create storage Procedure call object.

CallingStatement cstmt = connection.prepareCall("CALL mysql_store_procedure(?, ?)");

3. Set parameters.

cstmt.setInt(1, 10);

cstmt.registerOutParameter(2, Types.INTEGER);

4. Execute the stored procedure.

cstmt.execute();

5. Get the return value.

int result = cstmt.getInt(2);

Here, we first get the MySQL database connection. In Java, we can use DriverManager to get the connection. Then, create the stored procedure call object and set the parameters. When executing a stored procedure, we can call the execute() method to execute the stored procedure. Finally, we can use the getInt() method to obtain the return value of the stored procedure.

3. Summary

It is very simple to call MySQL stored procedures using Java. You only need to use JDBC to connect to the MySQL database and connect to the stored procedures. We can pass parameters to stored procedures and receive return values ​​using correct parameter settings and stored procedure execution. Using stored procedures can greatly simplify repetitive work in database operations and improve efficiency when operating the database.

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