MybatisPlus

目标：

  • 了解mybatisplus的特点
  • 能够掌握mybatisplus快速入门
  • 能够掌握mybatisplus常用注解
  • 能够掌握mybatisplus常用的增删改查
  • 能够掌握mybatisplus自动代码生成

1. 概述

•MyBatis-Plus（简称 MP）是一个 MyBatis 的增强工具，在 MyBatis 的基础上只做增强不做改变，为简化开发、提高效率而生。

•官网：https://mybatis.plus/ 或 https://mp.baomidou.com/

image-20201008112252456

版本

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<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus</artifactId>
    <version>3.4.0</version>
</dependency>

2. 快速入门

SpringBoot 整合 MyBatis-Plus，并实现根据Id查询功能。

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①数据库环境准备
②创建SpringBoot工程，引入MyBatis-Plus起步依赖
③编写DataSource相关配置
④编写mapper
⑤测试

2.1 数据库环境准备

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详见附件

2.2 创建SpringBoot工程，引入MyBatis-Plus起步依赖

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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>mybatis-plus-test</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>mybatis-plus-test</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </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>
        </dependency>
        <!-- mysql  驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.26</version>
        </dependency>
        <!--mybatisplus起步依赖-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.0</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

2.3 编写DataSource相关配置

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server.port=10001
# datasource
spring.datasource.url=jdbc:mysql://localhost:3306/mp?characterEncoding=utf-8
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver


2.4 编码

编写mapper

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/**
 * 使用mp定义Mapper，需要让Mapper接口继承 BaseMapper接口。
 */

public interface UserMapper extends BaseMapper<User> {
}

实体类

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@TableName("tb_user") // 指定表名
@Data
public class User {
    private Long id;
    private String userName;
    private String password;
    private String name;
    private Integer age;
    private String email;

启动类增加 @MapperScan 注解

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package com.example.mybatisplustest;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication
@MapperScan("com.example.mybatisplustest.mapper")
public class MybatisPlusTestApplication {

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

}


2.5 测试

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package com.example.mybatisplustest.mapper;

import com.example.mybatisplustest.MybatisPlusTestApplication;
import com.example.mybatisplustest.pojo.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;

@SpringBootTest(classes = MybatisPlusTestApplication.class)
@RunWith(SpringRunner.class)
public class UserMapperTest {
    @Autowired
    private UserMapper userMapper;
    /**
     * 根据id查询
     */
    @Test
    public void testSelectById() {

        User user = userMapper.selectById(1L);
        System.out.println(user);

    }
}

3. CRUD

3.1 添加

3.1.1 方法解析

image-20201008114929998

3.1.2 测试

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@Test
    public void testInsert() {
        User user = new User();
        //user.setId(6L);
        user.setUserName("itcast");
        user.setPassword("itheima");
        int count = userMapper.insert(user);
        System.out.println(count);
    }

3.1.3 说明1, 实体类上的注解 @TableField

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1)  @TableField("user_name") 指定映射关系
实体类的属性名和数据库的字段名自动映射：
	 *  名称一样
	 *  数据库字段使用_分割，实体类属性名使用驼峰名称
   否则需要使用 @TableField("user_name") 指定映射关系
2)  忽略某个字段的查询和 插入
	  @TableField(exist = false) 
3)  设置id生成策略:AUTO 数据库自增
    @TableId(type = IdType.AUTO)

3.1.4 说明2, 配置

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mybatis-plus:
  global-config:
    db-config:
      # 表名前缀
      table-prefix: tb_
      # id生成策略 数据库自增
      id-type: auto
  configuration:
    # 日志
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
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##mybatis-plus
mybatis-plus.global-config.db-config.table-prefix=tb_
mybatis-plus.global-config.db-config.id-type=auto
mybatis-plus.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl

3.1.5 具体使用如下

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/**
 * 实体类的属性名和数据库的字段名自动映射：
 *  1. 名称一样
 *  2. 数据库字段使用_分割，实体类属性名使用驼峰名称
 */

@TableName("tb_user")
@Data
public class User {


    //设置id生成策略:AUTO 数据库自增
    @TableId(type = IdType.AUTO)
    private Long id;
    //@TableField("user_name")
    private String userName;

    private String password;
    private String name;
    private Integer age;
    private String email;

    //不希望该值存入数据库
   // @TableField(exist = false)
   // private String info;

}

3.2 删除

image-20201008114022226

3.2.1 根据id删除

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int count = userMapper.deleteById(8L);

3.2.1 根据id集合批量删除

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 List ids = new ArrayList();
        ids.add(6);
        ids.add(7);

userMapper.deleteBatchIds(ids);

3.2.1 根据map构造条件，删除

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 Map<String, Object> map = new HashMap<>();

        //delete from tb_user where user_name = ? and age = ?
        map.put("user_name","itcast");
        map.put("age","18");

userMapper.deleteByMap(map);

3.3 更新

image-20201008114912504

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@Test
    public void testUpdateById() {
        User user = new User();
        user.setId(2L);
        user.setPassword("1111111");
        int count = userMapper.updateById(user);
    }

4 查询

image-20201008115031886

4.1 分页查询

配置 拦截器

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@Configuration
public class PageConfig {

    /**
     * 3.4.0之前的版本用这个
     * @return
     */
   /* @Bean
    public PaginationInterceptor paginationInterceptor(){
        return  new PaginationInterceptor();
    }*/

    /**
     * 3.4.0之后提供的拦截器的配置方式
     * @return
     */
   @Bean
   public MybatisPlusInterceptor mybatisPlusInterceptor(){
       MybatisPlusInterceptor mybatisPlusInterceptor = new MybatisPlusInterceptor();
       mybatisPlusInterceptor.addInnerInterceptor(new PaginationInnerInterceptor());
       return mybatisPlusInterceptor;
   }
}

查询

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/**
     * 分页查询：
     *  1. 当前页码：currentPage
     *  2. 每页显示条数：size
     *
     *  注意：使用mp的分页要设置一个拦截器！！！
            */
    @Test
    public void testSelectPage() {
        int current = 1;//当前页码
        int size = 2;//每页显示条数
        IPage<User> page = new Page(current,size);
        userMapper.selectPage(page,null);

        List<User> records = page.getRecords();//当前页的数据
        long pages = page.getPages();//总页数 2
        long total = page.getTotal();//总记录数 4
        System.out.println(records);
        System.out.println(pages);
        System.out.println(total);
    }

4.2 条件构造器查询

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/**
 * 基础比较查询
 *
 * Wrapper:
 *  1.QueryWrapper
 *      LambdaQueryWrapper
 *  2.UpdateWrapper
 *      LambdaUpdateWrapper
 *
 */

4.2.1 基础查询

通过 QueryWrapper 指定查询条件

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eq( ) :  等于 =
ne( ) :  不等于 <>
gt( ) :  大于 >
ge( ) :  大于等于  >=
lt( ) :  小于 <
le( ) :  小于等于 <=
between ( ) :  BETWEEN 值1 AND 值2 
notBetween ( ) :  NOT BETWEEN 值1 AND 值2 
in( ) :  in
notIn( ) ：not in
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@Test
    public void testWrapper1(){
        //1.创建查询条件构建器
        QueryWrapper<User> wrapper = new QueryWrapper<>();
        //2.设置条件
        wrapper.eq("user_name","lisi")
                .lt("age",23)
                .in("name","李四","王五");
        //select * from tb_user where user_name = ? and age < ? and name in (?,?)
        List<User> users = userMapper.selectList(wrapper);
        System.out.println(users);
    }

4.2.2 逻辑查询 or

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or( ) ：让紧接着下一个方法用or连接 
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@Test
    public void testWrapper2(){
        //1.创建查询条件构建器
        QueryWrapper<User> wrapper = new QueryWrapper<>();
        //2.设置条件
        wrapper.eq("user_name","lisi")
                .or()
                .lt("age",23)
                .in("name","李四","王五");
        /*
            select * from tb_user where user_name = ? or age < ? and name in (?,?)
         */
        List<User> users = userMapper.selectList(wrapper);
        System.out.println(users);
    }

4.2.3 模糊查询 like

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like
notLike
likeLeft
likeRight
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/**
     * 模糊查询
     */
    @Test
    public void testWrapper3(){
        //1.创建查询条件构建器
        QueryWrapper<User> wrapper = new QueryWrapper<>();
        //2.设置条件
        wrapper.likeLeft("user_name","zhang");
        /*
            SELECT id,user_name,password,name,age,email
             from tb_user
             where user_name like ?
             %zhang
         */
        List<User> users = userMapper.selectList(wrapper);
        System.out.println(users);
    }

4.2.4 排序查询

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orderBy
orderByAsc
orderByDesc
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@Test
    public void testWrapper4(){
        //1.创建查询条件构建器
        QueryWrapper<User> wrapper = new QueryWrapper<>();
        //2.设置条件
        wrapper.eq("user_name","lisi")
                .or()
                .lt("age",23)
            	.or()
                .in("name","李四","王五")
                //.orderBy(true,true,"age")
                .orderByDesc("age");
        /*
            select * from tb_user where user_name = ? or age < ? and name in (?,?) order by age asc
         */
        List<User> users = userMapper.selectList(wrapper);
        System.out.println(users);
    }

4.2.5 select：指定需要查询的字段

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@Test
    public void testWrapper5(){
        //1.创建查询条件构建器
        QueryWrapper<User> wrapper = new QueryWrapper<>();
        //2.设置条件
        wrapper.eq("user_name","lisi")
                .or()
                .lt("age",23)
            	.or()
                .in("name","李四","王五")
                //.orderBy(true,true,"age")
                .orderByDesc("age")
                .select("id","user_name");
        /*
            select id,user_name from tb_user where user_name = ? or age < ? and name in (?,?) order by age asc
         */
        List<User> users = userMapper.selectList(wrapper);
        System.out.println(users);
    }

4.2.6 分页条件查询

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@Test
    public void testWrapper6(){

        int current = 1;//当前页码
        int size = 2;//每页显示条数
        //1. 构建分页对象
        Page<User> page = new Page<>(current,size);
        //2. 构建条件对象
        QueryWrapper<User> wrapper = new QueryWrapper();
        wrapper.lt("age",23);
        userMapper.selectPage(page,wrapper);
        List<User> records = page.getRecords();
        long total = page.getTotal();
        long pages = page.getPages();
        System.out.println(records);
        System.out.println(total);//2
        System.out.println(pages);//1

    }

4.2.7 LambdaQueryWrapper：消除代码中的硬编码

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@Test
    public void testWrapper7(){
        LambdaQueryWrapper<User> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(User::getUserName,"zhangsan");
        userMapper.selectOne(wrapper);
    }

4.2.8 条件 删除

image-20201008121325431

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@Test
   public void testWrapper8(){
       QueryWrapper<User> wrapper = new QueryWrapper<>();
       wrapper.eq("user_name","bbb");
       userMapper.delete(wrapper);
   }

4.2.9 条件 update

image-20201008121332555

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@Test
    public void testWrapper9(){
        UpdateWrapper<User> wrapper = new UpdateWrapper<>();
        //条件
        wrapper.eq("user_name","lisi")
                .set("password","22222");
        //update tb_user set password = ? where user_name = ?
        userMapper.update(null,wrapper);
    }
    @Test
    public void testWrapper10(){
        UpdateWrapper<User> wrapper = new UpdateWrapper<>();
    //条件
        wrapper.eq("user_name","lisi");
    //update tb_user set password = ?,age = ? where user_name = ?
        User user = new User();
        user.setPassword("3333");
        user.setAge(33);
        userMapper.update(user,wrapper);
}

5 service 封装

Mybatis-Plus 为了开发更加快捷，对业务层也进行了封装，直接提供了相关的接口和实现类。我们在进行业务层开发时，可以继承它提供的接口和实现类，使得编码更加高效

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- 1. 定义接口继承IService
- 2. 定义实现类继承ServiceImpl<Mapper，Entity> 实现定义的接口

接口

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public interface _UserService extends IService<User> {
}

实现类封装

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@Service
public class _UserServiceImpl extends ServiceImpl<UserMapper, User> implements _UserService {}
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package com.example.mybatisplustest.service;

import com.baomidou.mybatisplus.core.conditions.update.UpdateWrapper;
import com.example.mybatisplustest.MybatisPlusTestApplication;
import com.example.mybatisplustest.pojo.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;

@SpringBootTest(classes = MybatisPlusTestApplication.class)
@RunWith(SpringRunner.class)
public class UserServiceTest {

    @Autowired
    private UserService userService;

    @Test
    public void testFind(){
        UpdateWrapper<User> wrapper = new UpdateWrapper<>();
        wrapper.eq("id",1);
        User one = userService.getOne(wrapper);
        System.out.println(one);
    }
}

6. 逆向工程-代码生成器

AutoGenerator 是 MyBatis-Plus 的代码生成器，通过 AutoGenerator 可以快速生成 Entity、Mapper、Mapper XML、Service、Controller 等各个模块的代码，极大的提升了开发效率。

6.1 导入坐标

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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>mybatis-plus-test</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>mybatis-plus-test</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </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>
        </dependency>
        <!-- mysql  驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.26</version>
        </dependency>
        <!--mybatisplus起步依赖-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.0</version>
        </dependency>
        <!--mp 代码生成器-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.4.0</version>
        </dependency>

        <dependency>
            <groupId>org.freemarker</groupId>
            <artifactId>freemarker</artifactId>
            <version>2.3.30</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

6.2 执行main 方法

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// 演示例子，执行 main 方法控制台输入模块表名回车自动生成对应项目目录中
package com.example.mybatisplustest;

import com.baomidou.mybatisplus.core.exceptions.MybatisPlusException;
import com.baomidou.mybatisplus.core.toolkit.StringPool;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.baomidou.mybatisplus.generator.AutoGenerator;
import com.baomidou.mybatisplus.generator.InjectionConfig;
import com.baomidou.mybatisplus.generator.config.*;
import com.baomidou.mybatisplus.generator.config.po.TableInfo;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
import com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine;

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

public class CodeGenerator {
    /**
     * <p>
     * 读取控制台内容
     * </p>
     */
    public static String scanner(String tip) {
        Scanner scanner = new Scanner(System.in);
        StringBuilder help = new StringBuilder();
        help.append("请输入" + tip + "：");
        System.out.println(help.toString());
        if (scanner.hasNext()) {
            String ipt = scanner.next();
            if (StringUtils.isNotBlank(ipt)) {
                return ipt;
            }
        }
        throw new MybatisPlusException("请输入正确的" + tip + "！");
    }

    public static void main(String[] args) {
        // 代码生成器
        AutoGenerator mpg = new AutoGenerator();

        // 全局配置
        GlobalConfig gc = new GlobalConfig();
        String projectPath = System.getProperty("user.dir");
        System.out.println(projectPath);
        gc.setOutputDir(projectPath + "/src/main/java"); //保存的位置
        gc.setAuthor("itheima");
        gc.setOpen(false);
        // gc.setSwagger2(true); 实体属性 Swagger2 注解
        mpg.setGlobalConfig(gc);

        // 数据源配置
        DataSourceConfig dsc = new DataSourceConfig();
        dsc.setUrl("jdbc:mysql://localhost:3306/mp");
        // dsc.setSchemaName("public");
        dsc.setDriverName("com.mysql.jdbc.Driver");
        dsc.setUsername("root");
        dsc.setPassword("root");
        mpg.setDataSource(dsc);

        // 包配置
        PackageConfig pc = new PackageConfig();
        pc.setModuleName(scanner("模块名"));
        pc.setParent("com.itheima");
        mpg.setPackageInfo(pc);

        // 自定义配置
        InjectionConfig cfg = new InjectionConfig() {
            @Override
            public void initMap() {
                // to do nothing
            }
        };

        // 如果模板引擎是 freemarker
        String templatePath = "/templates/mapper.xml.ftl";
        // 如果模板引擎是 velocity
        // String templatePath = "/templates/mapper.xml.vm";

        // 自定义输出配置
        List<FileOutConfig> focList = new ArrayList<>();
        // 自定义配置会被优先输出
        focList.add(new FileOutConfig(templatePath) {
            @Override
            public String outputFile(TableInfo tableInfo) {
                // 自定义输出文件名 ， 如果你 Entity 设置了前后缀、此处注意 xml 的名称会跟着发生变化！！
                return projectPath + "/src/main/resources/mapper/" + pc.getModuleName()
                        + "/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
            }
        });
        /*
        cfg.setFileCreate(new IFileCreate() {
            @Override
            public boolean isCreate(ConfigBuilder configBuilder, FileType fileType, String filePath) {
                // 判断自定义文件夹是否需要创建
                checkDir("调用默认方法创建的目录，自定义目录用");
                if (fileType == FileType.MAPPER) {
                    // 已经生成 mapper 文件判断存在，不想重新生成返回 false
                    return !new File(filePath).exists();
                }
                // 允许生成模板文件
                return true;
            }
        });
        */
        cfg.setFileOutConfigList(focList);
        mpg.setCfg(cfg);

        // 配置模板
        TemplateConfig templateConfig = new TemplateConfig();

        // 配置自定义输出模板
        //指定自定义模板路径，注意不要带上.ftl/.vm, 会根据使用的模板引擎自动识别
        // templateConfig.setEntity("templates/entity2.java");
        // templateConfig.setService();
        // templateConfig.setController();

        templateConfig.setXml(null);
        mpg.setTemplate(templateConfig);

        // 策略配置
        StrategyConfig strategy = new StrategyConfig();
        strategy.setNaming(NamingStrategy.underline_to_camel);
        strategy.setColumnNaming(NamingStrategy.underline_to_camel);
        //strategy.setSuperEntityClass("你自己的父类实体,没有就不用设置!");
        strategy.setEntityLombokModel(true);
        strategy.setRestControllerStyle(true);
        // 公共父类
        //strategy.setSuperControllerClass("你自己的父类控制器,没有就不用设置!");
        // 写于父类中的公共字段
        strategy.setSuperEntityColumns("id");
        strategy.setInclude(scanner("表名，多个英文逗号分割").split(","));
        strategy.setControllerMappingHyphenStyle(true);
        strategy.setTablePrefix(pc.getModuleName() + "_");
        mpg.setStrategy(strategy);
        mpg.setTemplateEngine(new FreemarkerTemplateEngine());
        mpg.execute();
    }
}