springboot16 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/2.1.4

16.1、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>2.1.4</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

3、测试数据库是否连接成功！

4、创建实体类，导入 Lombok！

lombok的maven坐标

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.16.12</version>
</dependency>

package com.zy.anquan.pojo;


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

@Data
@AllArgsConstructor
@NoArgsConstructor
//@Data 生成getter,setter ,toString等函数
// @NoArgsConstructor 生成无参构造函数
// @AllArgsConstructor //生成全参数构造函数
public class User {

    private int id;
    private String name;
    private String pwd;
}

5、创建mapper目录以及对应的 Mapper 接口

//@Mapper : 表示本类是一个 MyBatis 的 Mapper
@Mapper
@Repository
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

<?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.kuang.mapper.DepartmentMapper">

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

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

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

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

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

7、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>

或者 在yaml中配置

mybatis:
  type-aliases-package: com.kuang.pojo
  mapper-locations: classpath:/mybatis/mapper/*.xml

8、编写Controller 进行测试！

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

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

    @GetMapping("/addUser")
    public String  addUser(){
       userMapper.addUser(new User(6,"阿毛","123456"));
        return "ok";
    }

    @GetMapping("/updateUser")
    public String  udpateUser(){
        userMapper.updateUser(new User(6,"阿毛","111111"));
        return "ok";
    }

    @GetMapping("/deleteUser")
    public String  deleteUser(){
        userMapper.deleteUser(5);
        return "ok";
    }
}

启动项目访问进行测试！