优化MyBatis-Plus批量插入策略方式

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.stereotype.Service;
import java.util.List;

// 假设实体类为 User
class User {
    private Long id;
    private String name;

    // 构造函数、getter 和 setter 方法
    public User() {}

    public User(Long id, String name) {
        this.id = id;
        this.name = name;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

// 假设 UserMapper 继承自 BaseMapper
interface UserMapper extends com.baomidou.mybatisplus.core.mapper.BaseMapper<User> {}

// UserService 继承自 ServiceImpl
@Service
class UserService extends ServiceImpl<UserMapper, User> {
    public boolean saveUserBatch(List<User> userList) {
        return this.saveBatch(userList);
    }
}

// 调用示例
public class Main {
    public static void main(String[] args) {
        UserService userService = new UserService();
        java.util.List<User> userList = new java.util.ArrayList<>();
        userList.add(new User(1L, "Alice"));
        userList.add(new User(2L, "Bob"));

        boolean result = userService.saveUserBatch(userList);
        if (result) {
            System.out.println("批量插入成功");
        } else {
            System.out.println("批量插入失败");
        }
    }
}

<dependencies>
    <!-- MyBatis-Plus -->
    <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus-boot-starter</artifactId>
        <version>3.5.3.1</version>
    </dependency>
    <!-- MySQL 驱动 -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.32</version>
    </dependency>
</dependencies>

import com.baomidou.mybatisplus.core.injector.AbstractMethod;
import com.baomidou.mybatisplus.core.injector.DefaultSqlInjector;
import com.baomidou.mybatisplus.extension.injector.methods.InsertBatchSomeColumn;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.List;

@Configuration
public class MybatisPlusConfig {
    @Bean
    public DefaultSqlInjector sqlInjector() {
        return new DefaultSqlInjector() {
            @Override
            public List<AbstractMethod> getMethodList(Class<?> mapperClass) {
                List<AbstractMethod> methodList = super.getMethodList(mapperClass);
                methodList.add(new InsertBatchSomeColumn());
                return methodList;
            }
        };
    }
}    

ximport com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;

@Data
@TableName("user")
public class User {
    private Long id;
    private String name;
    @TableField("age")
    private Integer age;
    private String email;
}    

import com.baomidou.mybatisplus.extension.injector.methods.InsertBatchSomeColumn;
import com.baomidou.mybatisplus.extension.plugins.inner.SqlParserInner;
import org.apache.ibatis.annotations.InsertProvider;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.builder.annotation.ProviderMethodResolver;

import java.util.List;

public interface UserMapper extends BaseMapper<User>, ProviderMethodResolver {
    @InsertProvider(type = InsertBatchSomeColumn.class, method = "sql")
    int insertBatchSomeColumn(@Param("list") List<User> list);
}    

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

import java.util.ArrayList;
import java.util.List;

@SpringBootApplication
public class InsertBatchTest implements CommandLineRunner {

    @Autowired
    private UserMapper userMapper;

    public static void main(String[] args) {
        SpringApplication.run(InsertBatchTest.class, args);
    }

    @Override
    public void run(String... args) throws Exception {
        List<User> userList = new ArrayList<>();
        User user1 = new User();
        user1.setName("Alice");
        user1.setAge(20);
        userList.add(user1);

        User user2 = new User();
        user2.setName("Bob");
        user2.setAge(22);
        userList.add(user2);

        int rows = userMapper.insertBatchSomeColumn(userList);
        System.out.println("插入行数: " + rows);
    }
}    

    user2.setName("Bob");
    user2.setAge(22);
    userList.add(user2);

    int rows = userMapper.insertBatchSomeColumn(userList);
    System.out.println("插入行数: " + rows);
}