MyBatis implements batch insertion of MySQL

Preparation

First, we need to ensure the following:

1. You have installed the MySQL database and can connect normally.
2. You have configured the MyBatis environment and can successfully execute a single insert statement.

Database table preparation

To demonstrate the process of bulk insert, we create a userstable named with the following fields:

CREATE TABLE users (
  id INT PRIMARY KEY AUTO_INCREMENT,
  name VARCHAR(100),
  email VARCHAR(100)
);

MyBatis mapping file

We need to write a MyBatis mapping file to define the SQL statement for the insert operation. In this example, we will use a mapping file in XML format.

First, create a UserMapper.xmlfile called and add the following content to it:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
  PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.example.UserMapper">
  
  <insert id="insertBatch" parameterType="java.util.List">
    INSERT INTO users (name, email)
    VALUES
    <foreach collection="list" item="item" separator=",">
      (#{item.name}, #{item.email})
    </foreach>
  </insert>
  
</mapper>

In the code above, we have defined an insertBatchinsert statement called . It takes a java.util.Listtype parameter where each element is an Userobject. We used <foreach>labels to loop through the list and generate the corresponding insert statement.

java code

Next, we need to use MyBatis to perform batch insert operations in Java code. First, we need to create a Userclass to represent a user in the database:

public class User {
    
    
  private String name;
  private String email;
  
  // 省略构造函数和getter/setter方法
}

We can then write an UserMapperinterface to define methods for bulk insert operations:

public interface UserMapper {
    
    
  void insertBatch(List<User> users);
}

Finally, in our Java code, we need to use SqlSessionFactoryand SqlSessionto perform bulk insert operations. Here is a simple example:

String resource = "path/to/your/mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);

try (SqlSession session = sqlSessionFactory.openSession()) {
    
    
  UserMapper userMapper = session.getMapper(UserMapper.class);

  List<User> users = new ArrayList<>();
  users.add(new User("John", "john@example

.com"));
  users.add(new User("Alice", "[email protected]"));

  userMapper.insertBatch(users);
  session.commit();
}

In the code above, we first SqlSessionFactoryBuilderconstruct an SqlSessionFactoryinstance with , and then use it to create a SqlSession. Next, we get UserMapperan instance of the interface and create a list containing the user data to be inserted. Finally, we call insertBatchthe method to perform the bulk insert, and call the method to commit the transaction after the insert is complete commit.

run code

Now, we have completed all the preparations. Running this code, MyBatis will batch insert our user data into userstables in the MySQL database.

Summarize

In this article, we learned how to use MyBatis to implement MySQL batch insert operations. We first prepared the database tables and MyBatis mapping files, and then wrote Java code to perform batch insert operations. By using the batch insert function of MyBatis, we can significantly improve the performance and efficiency of inserting large amounts of data.

Hope this blog can help you, thanks for reading! If you have any problems or questions, feel free to ask.