文末视频讲解

SpringBoot的版本是2.2.0

一、整合Mybatis

1-1、引入pom文件

  <dependency>     <groupId>mysqlgroupId>     <artifactId>mysql-connector-javaartifactId>     <version>8.0.19version> dependency>  <dependency>     <groupId>com.alibabagroupId>     <artifactId>druid-spring-boot-starterartifactId>     <version>1.1.23version> dependency>  <dependency>     <groupId>org.mybatis.spring.bootgroupId>     <artifactId>mybatis-spring-boot-starterartifactId>     <version>2.1.3version> dependency>

1-2、添加application.yml配置文件

添加MySql配置文件

spring:    datasource:        type: com.alibaba.druid.pool.DruidDataSource        driver-class-name: com.mysql.cj.jdbc.Driver        url: jdbc:mysql://ip:prot/database?useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&useSSL=false&serverTimezone=UTC        username: root        password: 123456        dbcp2:            min-idle: 5                                 # 数据库连接池最小维持连接数            initial-size: 5                            # 初始连接数            max-total: 5                               # 最大连接数            max-wait-millis: 200                      # 等待链接获取的最大超时时间

添加Mybatis配置文件

mybatis:    type-aliases-package: com.xdx97.frame         # 所有Entity别名类所在包    mapper-locations: classpath:mappers/**/*Mapper.xml      # mapper映射文件 - classpath:mybatis/mapper/**/*.xml

1-3、测试

Frame

public class Frame {    private Integer id;    private String name;    public Integer getId() {        return id;    }    public void setId(Integer id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }}

TestMapper

import com.xdx97.frame.bean.Frame;import org.apache.ibatis.annotations.Mapper;import org.apache.ibatis.annotations.Param;@Mapperpublic interface TestMapper{    Frame selectById(@Param("idq") int id);}

TestMapper.xml

<?xml version="1.0" encoding="UTF-8"?>        <mapper namespace="com.xdx97.frame.mapper.TestMapper"><select id="selectById" parameterType="java.lang.Integer" resultType="com.xdx97.frame.bean.Frame">        SELECT id,name FROM frame WHERE id = #{idq}    select>mapper>

TestController

import com.xdx97.frame.bean.Frame;import com.xdx97.frame.mapper.TestMapper;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class TestController {        @Autowired    private TestMapper testMapper;    @GetMapping("/test")    public Frame fun(){        return testMapper.selectById(1);    }}

二、整合Mybatis-Plus

2-1、引入pom

  <dependency>     <groupId>com.baomidougroupId>     <artifactId>mybatis-plus-boot-starterartifactId>     <version>3.2.0version> dependency>

2-2、修改yml文件

mybatis:  type-aliases-package: com.xdx97.frame         # 所有Entity别名类所在包mybatis-plus:  mapper-locations: classpath:mappers/**/*Mapper.xml      # mapper映射文件 - classpath:mybatis/mapper/**/*.xml

2-3、修改TestMapper

继承BaseMapper

import com.baomidou.mybatisplus.core.mapper.BaseMapper;import com.xdx97.frame.bean.Frame;import org.apache.ibatis.annotations.Mapper;import org.apache.ibatis.annotations.Param;@Mapperpublic interface TestMapper extends BaseMapper {    Frame selectById(@Param("idq") int id);}

这样，baseMapper里面的方法我们就可以直接使用了

三、其它

3-1、如果你需要用到枚举，那么你需要多配置一个handle

配置位置如下，具体handle如果写，百度一下

mybatis-plus:  mapper-locations: classpath:mappers/**/*Mapper.xml      # mapper映射文件 - classpath:mybatis/mapper/**/*.xml  type-handlers-package:

3-2、如果引入Mbatis-Plus后出现了如下异常

Invalid bound statement (not found):

如果你的xml等一些配置关联没有写错的话，那么请考虑下面这种情况

• 如果引用mybatis-plus-boot-starter 依赖，需要配置 mybatis-plus.mapper-locations

• 如果引用mybatis-plus 依赖，需要配置 mybatis.mapper-locations