(二)spring boot 整合 mybatis

开发环境：
java version "1.8.0_171"
Apache Maven 3.5.4
mysql

在数据库中创建表

CREATE TABLE `user` (
  `id` int(10) NOT NULL AUTO_INCREMENT COMMENT 'ID',
  `name` varchar(255) NOT NULL COMMENT '用户名',
  `age` int(10) NOT NULL COMMENT '年龄',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8mb4;

在IDEA中创建新项目，直接一路next到下图，选择这两项之后继续直接一路next然后finish

image.png

项目结构如下图所示：

image.png

然后application.properties文件中配置数据库相关链接信息

spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=root
spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

创建UserMapper接口

package com.example.demo.dao.mapper;

import com.example.demo.dao.model.User;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Component;

@Mapper
@Component(value = "userMapper")
public interface UserMapper {

    @Select("SELECT * FROM USER WHERE NAME = #{name}")
    User findByName(@Param("name") String name);

    @Insert("INSERT INTO USER(NAME, AGE) VALUES(#{name}, #{age})")
    int insert(@Param("name") String name, @Param("age") Integer age);

}

创建Dao类

package com.example.demo.dao.model;

public class User {
    private Long id;
    private String name;
    private Integer age;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

在测试类上添加测试方法

package com.example.demo;

import com.example.demo.dao.mapper.UserMapper;
import com.example.demo.dao.model.User;
import org.junit.Assert;
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.annotation.Rollback;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class DemoApplicationTests {

    @Test
    public void contextLoads() {
    }

    @Autowired
    private UserMapper userMapper;

    @Test
    public void findByName() throws Exception {
        userMapper.insert("AAA", 20);
        User u = userMapper.findByName("AAA");
        System.out.println(u.getName());
        Assert.assertEquals(20, u.getAge().intValue());
    }

}

运行findByName方法：

image.png

附件：pom.xml

    4.0.0

    com.example
    demo
    0.0.1-SNAPSHOT
    jar

    demo
    Demo project for Spring Boot

    
        org.springframework.boot
        spring-boot-starter-parent
        2.0.5.RELEASE
         
    

    
        UTF-8
        UTF-8
        1.8
    

    
        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
            1.3.2
        

        
            mysql
            mysql-connector-java
            runtime
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin