mybatis批量insert

MyBatis is a Java-based persistence framework that facilitates database operations. It provides a powerful feature called batch insert, which allows inserting multiple records into the database in a single database round trip, improving performance and reducing overhead.

Batch insert in MyBatis involves creating a list of objects that represent the records to be inserted, and then using the `insert` statement to execute the batch operation.

Here's an example of how to perform a batch insert with MyBatis:

1. Define a Mapper Interface: ```java public interface UserMapper { void insertUsers(List users); } ```

2. Create a Data Transfer Object (DTO) class: ```java public class User { private String username; private String email;

// Constructor, getters, and setters } ```

3. Write the SQL insert statement in a Mapper XML file: ```xml insert into users (username, email) values (#{user.username}, #{user.email}) ```

4. Configure MyBatis in the XML configuration file: ```xml ... ```

5. Use the batch insert operation in your application code: ```java public static void main(String[] args) { try (SqlSession session = getSessionFactory().openSession()) { UserMapper userMapper = session.getMapper(UserMapper.class);

List users = new ArrayList<>(); // Add 1000 users to the list

userMapper.insertUsers(users); session.commit(); } } ```

In this example, we define a `UserMapper` interface with an `insertUsers` method that takes a list of `User` objects as a parameter. The XML mapper file contains the SQL insert statement, which uses `foreach` to iterate over the list of users and insert them into the database.

In the main method, we create a list of 1000 users and pass it to the `insertUsers` method. Finally, we commit the changes to the database.

By using batch insert, MyBatis reduces the number of database round trips required to insert the records, improving performance significantly when dealing with a large number of records.

Note: It's important to properly configure your database settings and handle any exceptions that may occur during the batch insert operation to ensure data integrity and robustness in your application.