java进阶|MyBatis系列文章(六)XML版批量操作sql

MyBatis是支持定制化SQL,存储过程以及高级映射的优秀的持久层框架。MyBatis避免了几乎所有的JDBC代码和手动设置参数以及获取结果集。MyBatis可以对配置和原生Map使用简单的XML或注解，将接口和Java的POJOS(Plian Old Java Objects,普通的Java对象)映射成数据库中的记录。

本文主要基于MyBatis框架的xml进行数据的批量插入操作，批量查询操作之所以会写这篇文章，主要还是觉得xml文件对动态sql的编写方面很方便。

       <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>        <dependency>            <groupId>org.mybatis.spring.boot</groupId>            <artifactId>mybatis-spring-boot-starter</artifactId>            <version>2.1.2</version>        </dependency>
        <dependency>            <groupId>mysql</groupId>            <artifactId>mysql-connector-java</artifactId>            <scope>runtime</scope>        </dependency>        <dependency>            <groupId>org.projectlombok</groupId>            <artifactId>lombok</artifactId>            <optional>true</optional>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>            <exclusions>                <exclusion>                    <groupId>org.junit.vintage</groupId>                    <artifactId>junit-vintage-engine</artifactId>                </exclusion>            </exclusions>        </dependency>        <dependency>            <groupId>com.alibaba</groupId>            <artifactId>fastjson</artifactId>            <version>1.2.68</version>        </dependency>        <!-- https://mvnrepository.com/artifact/com.github.pagehelper/pagehelper-spring-boot-starter -->        <dependency>            <groupId>com.github.pagehelper</groupId>            <artifactId>pagehelper-spring-boot-starter</artifactId>            <version>1.2.12</version>        </dependency>

package com.wpw.mybatisbatchoperationxml.entity;
import lombok.AllArgsConstructor;import lombok.Builder;import lombok.Data;import lombok.NoArgsConstructor;import lombok.experimental.Accessors;
import java.io.Serializable;import java.util.List;import java.util.Map;
/** * @author wpw */@AllArgsConstructor@NoArgsConstructor@Data@Builder@Accessors(chain = true)public class User implements Serializable {    private Integer id;    private String userName;    private String passWord;    private Integer age;    private List<Integer> idList;    private Integer pageNumber;    private Integer pageSize;    private Integer[] ids;}

package com.wpw.mybatisbatchoperationxml.controller;
import com.alibaba.fastjson.JSONObject;import com.github.pagehelper.PageHelper;import com.wpw.mybatisbatchoperationxml.entity.User;import com.wpw.mybatisbatchoperationxml.mapper.UserMapper;import org.springframework.util.CollectionUtils;import org.springframework.web.bind.annotation.PostMapping;import org.springframework.web.bind.annotation.RequestBody;import org.springframework.web.bind.annotation.RestController;
import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.stream.Collectors;import java.util.stream.Stream;
/** * @author wpw */@RestControllerpublic class UserController {    private final UserMapper userMapper;
    public UserController(UserMapper userMapper) {        this.userMapper = userMapper;    }
    @PostMapping(value = "/batchInsert")    public int batchInsert(@RequestBody JSONObject jsonObject) {        List<User> userList = jsonObject.getJSONArray("userList").toJavaList(User.class);        return userMapper.batchInsert(userList);    }
    @PostMapping(value = "/batchList")    public List<User> batchList(@RequestBody User user) {        return userMapper.batchList(user.getUserName(), user.getPassWord(), user.getIdList());    }
    @PostMapping(value = "/list-pagination")    public List<User> listPagination(@RequestBody User user) {        PageHelper.startPage(user.getPageNumber(), user.getPageSize());        return userMapper.listPagination(user.getUserName(), user.getPassWord());    }
    @PostMapping(value = "/listByArray")    public List<User> batchListBaseArray(@RequestBody User user) {        PageHelper.startPage(user.getPageNumber(), user.getPageSize());        return userMapper.batchListBaseArray(user.getIds());    }
    @PostMapping(value = "/listByMap")    public List<User> batchListBaseMap(@RequestBody(required = false) Map<String, Integer[]> map) {        List<User> userList = preCheck(map);        if (!CollectionUtils.isEmpty(userList)) {            return userList;        }        HashMap<String, List<Integer>> hashMap = new HashMap<>(16, 0.75f);        List<Integer> ids = Stream.of(map.get("ids")).collect(Collectors.toList());        hashMap.put("ids", ids);        return userMapper.batchListBaseMap(hashMap);    }
    private List<User> preCheck(Map<String, Integer[]> map) {        /**         * 若获取的参数为null，则直接全表去查，默认第一页，pageNumber=1,pageSize=10         */        if (map == null) {            PageHelper.startPage(1, 10);            return userMapper.batchListBaseEmptyArgument();        }        return null;    }}

package com.wpw.mybatisbatchoperationxml.mapper;
import com.wpw.mybatisbatchoperationxml.entity.User;import org.apache.ibatis.annotations.Mapper;import org.springframework.stereotype.Repository;
import java.util.List;
/** * @author wpw */@Mapper@Repositorypublic interface UserMapper {    /**     * 批量插入用户信息     *     * @param userList 用户信息     * @return 是否插入成功     */    int batchInsert(List<User> userList);
    /**     * 根据查询条件进行数据的查询     *     * @param userName 用户名称     * @param passWord 用户密码     * @param idList   用户id集合信息     * @return 用户列表信息     */    List<User> batchList(String userName, String passWord, List<Integer> idList);
    /**     * 根据用户名和密码进行用户信息的查询     *     * @param userName 用户名     * @param passWord 密码     * @return 用户列表信息     */    List<User> listPagination(String userName, String passWord);
    /**     * 根据数组进行用户列表数据的查询     *     * @param ids 数组     * @return 用户数据信息     */    List<User> batchListBaseArray(Integer[] ids);
    /**     * 查询符合条件的用户信息     *     * @param ids map参数信息     * @return 用户列表信息     */    List<User> batchListBaseMap(Object ids);
    /**     * 获取用户列表数据     * @return 用户列表数据     */    List<User> batchListBaseEmptyArgument();}

<?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"><!--这个mapper指定一个唯一的namespace，namespace的值习惯上设置成包名+sql映射文件名，这样就能够保证namespace的值是唯一的 --><mapper namespace="com.wpw.mybatisbatchoperationxml.mapper.UserMapper">    <insert id="batchInsert" parameterType="list">        <selectKey resultType="Integer" keyProperty="id" order="AFTER">            select last_insert_id();        </selectKey>        insert into user(username,password,age)        values        <foreach collection="list" item="user" index="index" separator=",">            (#{user.userName},            #{user.passWord},            #{user.age})        </foreach>    </insert>    <select id="batchList" resultMap="map">        select * from user        where id in        <foreach collection="idList" item="item" index="index" open="(" separator="," close=")">            #{item}        </foreach>        <if test="userName!=null">            and username=#{userName}        </if>        <if test="passWord!=null">            and password=#{passWord}        </if>    </select>    <resultMap id="map" type="com.wpw.mybatisbatchoperationxml.entity.User">        <id property="id" column="id"/>        <result property="userName" column="username"/>        <result property="passWord" column="password"/>        <result property="age" column="age"/>    </resultMap>    <select id="listPagination" resultMap="map">        select * from user        <where>            <if test="userName!=null">                username=#{userName}            </if>            <if test="passWord!=null">                and password=#{passWord}            </if>        </where>    </select>    <select id="batchListBaseArray" resultMap="map">        select * from user        where id in        <foreach collection="array" index="index" item="item" open="(" separator="," close=")">            #{item}        </foreach>    </select>    <select id="batchListBaseMap" parameterType="java.util.HashMap"            resultMap="map">        select * from user        where id in        <foreach collection="ids" index="index" item="item" open="(" separator="," close=")">            #{item}        </foreach>    </select>    <select id="batchListBaseEmptyArgument" resultMap="map">        select *        from user    </select></mapper>

server:  port: 8080spring:  application:    name: mybatis-batch-operation-xml  datasource:    url: jdbc:mysql://localhost:3306/study?serverTimezone=UTC    username: root    password: root    driver-class-name: com.mysql.cj.jdbc.Drivermybatis:  mapper-locations: classpath:/mapper/**.xmlpagehelper:  reasonable: true

github:https://github.com/myownmyway/mybatis-batch-operation-xml.git

create database if not exists study;use study;select database();create table if not exists `user`(    id   int(11) auto_increment primary key comment "主键id",    username varchar(255) comment '姓名',    password varchar(255) comment '密码',    age  int(3) comment '年纪') engine = InnoDb  charset = utf8;insert into user(username,password,age) values("zhangsan","123456",1);insert into user(username,password,age) values("lisi","123456",2);insert into user(username,password,age) values("wangwu","123456",3);insert into user(username,password,age) values("zhaoliu","123456",4);insert into user(username,password,age) values("dengchao","123456",5);insert into user(username,password,age) values("sunli","123456",6);insert into user(username,password,age) values("huangxiaoming","123456",7);insert into user(username,password,age) values("zhaowei","123456",8);insert into user(username,password,age) values("haungbo","123456",9);insert into user(username,password,age) values("shenteng","123456",10);insert into user(username,password,age) values("gaoyuanyuan","123456",11);insert into user(username,password,age) values("wanghan","123456",12);