十二、SpringBoot 整合MyBatis

狂神-SpringBoot笔记目录

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十二、整合MyBatis

• 官方文档：http://mybatis.org/spring-boot-starter/mybatis-spring-boot-autoconfigure/

• Maven仓库地址：https://mvnrepository.com/artifact/org.mybatis.spring.boot/mybatis-spring-boot-starter/2.1.1

12.1整合测试

• 1、导入 MyBatis 所需要的依赖

<!--mybatis-spring-boot整合-->
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.1.1</version>
</dependency>

• 2、配置数据库连接信息（不变）

spring:
  datasource:
    username: root
    password: 123456
    #?serverTimezone=UTC解决时区的报错
    url: jdbc:mysql://localhost:3306/springboot?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
    driver-class-name: com.mysql.cj.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource

    #Spring Boot 默认是不注入这些属性值的，需要自己绑定
    #druid 数据源专有配置
    initialSize: 5
    minIdle: 5
    maxActive: 20
    maxWait: 60000
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 300000
    validationQuery: SELECT 1 FROM DUAL
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    poolPreparedStatements: true

    #配置监控统计拦截的filters，stat:监控统计、log4j：日志记录、wall：防御sql注入
    #如果允许时报错  java.lang.ClassNotFoundException: org.apache.log4j.Priority
    #则导入 log4j 依赖即可，Maven 地址：https://mvnrepository.com/artifact/log4j/log4j
    filters: stat,wall,log4j
    maxPoolPreparedStatementPerConnectionSize: 20
    useGlobalDataSourceStat: true
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
#整合mybatis(在mybatis中是在配置文件中写的，在SSM中是在spring的配置文件中写的)
mybatis:
  type-aliases-package: com.wlw.pojo  #别名
  mapper-locations: classpath:mybatis/mapper/*.xml  #注册mapper文件    
    

• 3、测试数据库是否连接成功！

• 4、创建实体类，导入 Lombok依赖！

  User.java

package com.wlw.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.util.Date;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private Integer id;
    private String username;
    private String password;
    private Boolean gender;
    private Date regist_time;
}

• 5、创建mapper目录以及对应的 Mapper 接口

  UserMapper.java

package com.wlw.mapper;

import com.wlw.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;

import java.util.List;

//也可以使用@MapperScan(com.wlw.mapper) 在 Springboot04DataApplication类上使用
@Mapper //表示本类是一个 MyBatis 的Mapper类 (类似之前的UserDao接口)
@Repository // 注解生成bean，dao层专用
public interface UserMapper {
    List<User> queryUserList();
    User queryUserById(int id);
    int addUser(User user);
    int updateUser(User user);
    int deleteUser(int id);
}

• 6、对应的Mapper映射文件

  UserMapper.xml.xml (src/main/resources/mybatis/mapper/UserMapper.xml)

<?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">

<mapper namespace="com.wlw.mapper.UserMapper">

    <select id="queryUserList" resultType="User">
        select * from t_user;
    </select>

    <select id="queryUserById" resultType="User">
        select * from t_user where id = #{id}
    </select>

    <insert id="addUser" parameterType="User">
        insert into t_user values (#{id},#{username},#{password},#{gender},#{regist_time});
    </insert>

    <update id="updateUser" parameterType="User">
        update t_user set  username=#{username}, password=#{password},gender=#{gender},regist_time=#{regist_time}
    </update>

    <delete id="deleteUser" parameterType="int">
        delete from t_user where id = #{id}
    </delete>
</mapper>

• 7、maven配置资源过滤问题

 	<build>
        <!-- 更改maven编译规则,解决xxxMapper.xml存放在resources以外路径中的读取问题
 		如果xxxMapper.xml 还是存放在/resources/mybatis/mapper/目录下就可以不用配-->
        <resources>
            <resource>
                <!-- 资源目录 -->
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include><!-- 新添加 */代表1级目录 **/代表多级目录-->
                </includes>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>

• 8、编写部门的 UserController 进行测试！

package com.wlw.controller;

import com.wlw.mapper.UserMapper;
import com.wlw.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class UserController {
    @Autowired
    private UserMapper userMapper;

    @GetMapping("/userList")
    public List<User> queryUserList(){
        List<User> users = userMapper.queryUserList();
        for (User user : users) {
            System.out.println(user);
        }
        return users;
    }

    @GetMapping("/addUser")
    public String addUser(){
        int i = userMapper.addUser(new User(6,"mengyuan","123",true,null));
        System.out.println("add--"+i);
        return "ok";
    }

    @GetMapping("/updateUser")
    public String updateUser(){
        int i = userMapper.updateUser(new User(6,"mengyuan","852963",true,null));
        System.out.println("update--"+i);
        return "ok";
    }

    @GetMapping("/deleteUser")
    public String deleteUser(){
        int i = userMapper.deleteUser(6);
        System.out.println("delete--"+i);
        return "ok";
    }
}

• 启动项目访问进行测试！