Mybatis 批量插入和更新小例

SpringBoot配置Mybatis前文有博文，数据库mysql:

package com.example.demo.biz.dto;

public class User {

    private int id;

    private String userName;

    private String passWord;

    private String gender;

    private String email;

    private String mobile;

    private String identity;

    private String nationality;

    private String description;

    private String address;

    public int getId() {
        return id;
    }

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

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getUserName() {
        return userName;
    }

    public String getPassWord() {
        return passWord;
    }

    public void setPassWord(String passWord) {
        this.passWord = passWord;
    }

    public String getGender() {
        return gender;
    }

    public String getEmail() {
        return email;
    }

    public String getMobile() {
        return mobile;
    }

    public String getIdentity() {
        return identity;
    }

    public String getNationality() {
        return nationality;
    }

    public String getDescription() {
        return description;
    }

    public String getAddress() {
        return address;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public void setMobile(String mobile) {
        this.mobile = mobile;
    }

    public void setIdentity(String identity) {
        this.identity = identity;
    }

    public void setNationality(String nationality) {
        this.nationality = nationality;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", userName='" + userName + '\'' +
                ", passWord='" + passWord + '\'' +
                ", gender='" + gender + '\'' +
                ", email='" + email + '\'' +
                ", mobile='" + mobile + '\'' +
                ", identity='" + identity + '\'' +
                ", nationality='" + nationality + '\'' +
                ", description='" + description + '\'' +
                ", address='" + address + '\'' +
                '}';
    }
}

<!--  批量插入
       collection ：collection属性的值有三个分别是list、array、map三种，分别对应的参数类型为：List、数组、map集合，我在上面传的参数为数组，所以值为array
　　　　item ： 表示在迭代过程中每一个元素的别名
　　　　index ：表示在迭代过程中每次迭代到的位置（下标）
　　　　open ：前缀
　　　　close ：后缀
　　　　separator ：分隔符，表示迭代时每个元素之间以什么分隔
     -->
    <insert id="insertBatchUser" parameterType="java.util.List">
          insert into c_tbl_users (username,pwd,gender,email,mobile,identity,address)
          values
        <foreach collection="list" item="user" separator=",">
            (#{user.userName},#{user.passWord},#{user.gender},#{user.email},#{user.mobile},#{user.identity},#{user.address})
        </foreach>
    </insert>

    <!-- MySQL没有提供直接的方法来实现批量更新，但可以使用case when语法来实现这个功能
     UPDATE c_tbl_users
    SET address = CASE userName 
        WHEN 'xx1' THEN 'address1'
        WHEN 'xx2' THEN 'address2'
        WHEN 'xx3' THEN 'address3'
    END, 
    email = CASE userName 
        WHEN 'xx1' THEN 'email1'
        WHEN 'xx2' THEN 'email2'
        WHEN 'xx3' THEN 'email3'
    END
    WHERE username IN ('','','')
   -->
    <update id="updateBatchUser" parameterType="java.util.List">
       update c_tbl_users
        <trim prefix="set" suffixOverrides=",">
            <trim prefix="address =case" suffix="end,">
                <foreach collection="list" item="i" index="index">
                    <if test="i.address!=null">
                        when username=#{i.userName} then #{i.address}
                    </if>
                </foreach>
            </trim>

            <trim prefix="email =case" suffix="end,">
                <foreach collection="list" item="i" index="index">
                    <if test="i.email!=null">
                        when username=#{i.userName} then #{i.email}
                    </if>
                </foreach>
            </trim>
        </trim>
        WHERE
        <foreach collection="list" separator="or" item="i" index="index" >
            username=#{i.userName}
        </foreach>
    </update>

package com.example.demo.biz.dao;

import com.example.demo.biz.dto.User;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;

import java.util.List;

/**
 * xml  形式配置
 */
@Repository
public interface UserMapper {
    /**
     * 批量插入
     * @param userList
     */
    void insertBatchUser(List<User> userList);

    /**
     * 批量更新
     * @param userList
     */
    void updateBatchUser(List<User> userList);
}

测试：

package com.example.demo.biz;

import com.example.demo.biz.dao.UserMapper;
import com.example.demo.biz.dto.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

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

@RunWith(SpringRunner.class)
@SpringBootTest
public class UserBatchTest {
    @Autowired
    protected UserMapper userMapper;

    @Test
    public void batchInsert(){

        List<User> list = new ArrayList<User>();

        for (int i = 0; i < 2 ; i++) {
            User user1 = new User();
            user1.setUserName("黑心寥"+i);
            user1.setPassWord("heixinliao");
            user1.setAddress("长安"+i);
            user1.setEmail("[e-mail]");
            user1.setGender("1");
            user1.setIdentity("321736165504567129");
            list.add(user1);
        }

        userMapper.insertBatchUser(list);
    }

    @Test
    public void batchUpdate(){
        List<User> list = getUserList();
        userMapper.updateBatchUser(list);
    }

    private List<User> getUserList(){
        List<User> list = new ArrayList<User>();
        for (int i = 0; i < 2 ; i++) {
            User user1 = new User();
            user1.setUserName("黑心寥"+i);
            user1.setPassWord("heixinliao");
            user1.setAddress("金陵"+i);
            user1.setEmail("[e-mail]");
            user1.setGender("1");
            user1.setIdentity("321736165504567129");
            list.add(user1);
        }
        return list;
    }
}