【Springboot-12】整合Mybatis

12.整合Mybatis

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/2.1.3

整合测试

1. 导入 MyBatis 所需要的依赖

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.1.3</version>
</dependency>
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1. 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
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1. 测试数据库是否连接成功！
2. 创建实体类，导入 Lombok！
   ​​User.java​​

package nuc.ss.pojo;

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

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private int id;
    private String name;
    private String pwd;
}
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1. 创建mapper目录以及对应的 Mapper 接口
   ​​UserMapper.java​​

package nuc.ss.mapper;

import nuc.ss.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;

import java.util.List;

// 这个注解表示了这是一个 mybatis 的 mapper 类
@Mapper
@Repository
public interface UserMapper {

    List<User> queryUserList();

    User queryUserById(int id);

    int addUser(User user);

    int updateUser(User user);

    int deleteUser(int id);
}
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1. 对应的Mapper映射文件
   ​​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">
<!--namespace=绑定一个对应的Dao/Mapper接口-->
<mapper namespace="nuc.ss.mapper.UserMapper">
    
    <select id="queryUserList" resultType="User">
        select * from mybatis.user;
    </select>

    <select id="queryUserById" resultType="User">
        select * from mybatis.user where id = #{id};
    </select>

    <insert id="addUser" parameterType="User">
        insert into mybatis.user (id, name, pwd) values (#{id},#{name},#{pwd});
    </insert>

    <update id="updateUser" parameterType="User">
        update mybatis.user set name=#{name},pwd = #{pwd} where id = #{id};
    </update>

    <delete id="deleteUser" parameterType="int">
        delete from mybatis.user where id = #{id}
    </delete>
</mapper>
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1. maven配置资源过滤问题

<resources>
    <resource>
        <directory>src/main/java</directory>
        <includes>
            <include>**/*.xml</include>
        </includes>
        <filtering>true</filtering>
    </resource>
</resources>
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1. 编写部门的 UserController 进行测试！

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

    @GetMapping("/queryUserList")
    public List<User> queryUserList() {
        List<User> userList = userMapper.queryUserList();

        for (User user : userList) {
            System.out.println(user);
        }

        return userList;
    }
    
     //添加一个用户
    @GetMapping("/addUser")
    public String addUser() {
        userMapper.addUser(new User(7,"阿毛","123456"));
        return "ok";
    }

    //修改一个用户
    @GetMapping("/updateUser")
    public String updateUser() {
        userMapper.updateUser(new User(7,"阿毛","123456"));
        return "ok";
    }

    @GetMapping("/deleteUser")
    public String deleteUser() {
        userMapper.deleteUser(7);

        return "ok";
    }
}
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启动项目访问进行测试！