SpringBoot学习笔记：配置Mybatis

Posted 2020-10-29 子烁爱学习

SpringBoot学习笔记（1）：配置Mybatis

参考资料：

　　1.AndyLizh的博客

　　2.xiaolyuh123的博客

快速开始

添加Mybatis依赖(其他依赖已省去)

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.0</version>
        </dependency>　　

配置application.properties文件

server.port=80
# 数据源配置
spring.datasource.url=jdbc:mysql://localhost:3306/ssb_test
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.username=root
spring.datasource.password=root
#连接池配置
#spring.datasource.type=org.apache.commons.dbcp2.BasicDataSource

#mybatis
#entity扫描的包名
mybatis.type-aliases-package=com.xiaolyuh.domain.model
#Mapper.xml所在的位置
mybatis.mapper-locations=classpath*:/mybaits/*Mapper.xml

#pagehelper分页插件配置
pagehelper.helperDialect=mysql
pagehelper.reasonable=true
pagehelper.supportMethodsArguments=true
pagehelper.params=count=countSql

#日志配置
logging.level.com.xiaolyuh=debug
logging.level.org.springframework.web=debug
logging.level.org.springframework.transaction=debug
logging.level.org.mybatis=debug

debug=false

mybatis除了以上两种常见配置外，还有：

mybatis.config-location=mybatis-config.xml配置文件的路径
mybatis.type-handlers-package=扫描typeHandlers的包
mybatis.check-config-location=检查配置文件是否存在
mybatis.executor-type=设置执行模式（SIMPLE, REUSE, BATCH），默认为SIMPLE

开发Mapper

@Mapper
public interface UserMapper {

    @Select("SELECT * FROM users")
    @Results({
        @Result(property = "userSex",  column = "user_sex", javaType = UserSexEnum.class),
        @Result(property = "nickName", column = "nick_name")
    })
    List<UserEntity> getAll();

    @Select("SELECT * FROM users WHERE id = #{id}")
    @Results({
        @Result(property = "userSex",  column = "user_sex", javaType = UserSexEnum.class),
        @Result(property = "nickName", column = "nick_name")
    })
    UserEntity getOne(Long id);

    @Insert("INSERT INTO users(userName,passWord,user_sex) VALUES(#{userName}, #{passWord}, #{userSex})")
    void insert(UserEntity user);

    @Update("UPDATE users SET userName=#{userName},nick_name=#{nickName} WHERE id =#{id}")
    void update(UserEntity user);

    @Delete("DELETE FROM users WHERE id =#{id}")
    void delete(Long id);

}

开始使用

　　上面三步就基本完成了相关dao层开发，使用的时候当作普通的类注入即可。

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

    @Autowired
    private UserMapper UserMapper;

    @Test
    public void testInsert() throws Exception {
        UserMapper.insert(new UserEntity("aa", "a123456", UserSexEnum.MAN));
        UserMapper.insert(new UserEntity("bb", "b123456", UserSexEnum.WOMAN));
        UserMapper.insert(new UserEntity("cc", "b123456", UserSexEnum.WOMAN));

        Assert.assertEquals(3, UserMapper.getAll().size());
    }

    @Test
    public void testQuery() throws Exception {
        List<UserEntity> users = UserMapper.getAll();
        System.out.println(users.toString());
    }

    @Test
    public void testUpdate() throws Exception {
        UserEntity user = UserMapper.getOne(3l);
        System.out.println(user.toString());
        user.setNickName("neo");
        UserMapper.update(user);
        Assert.assertTrue(("neo".equals(UserMapper.getOne(3l).getNickName())));
    }
}

Mapper的注册方式

启动类添加注解

@SpringBootApplication  
@MapperScan("com.kerry.mapper")  
public class Application {  
  
    public static void main(String[] args) {  
        SpringApplication.run(Application.class, args);  
    }  
}  

每个接口类单独添加注解

package com.kerry.mapper;  
  
import java.util.List;  
  
import org.apache.ibatis.annotations.Mapper;  
  
import com.kerry.model.User;  
  
@Mapper  
public interface UserMapper {  
      
    List<User> getAll();  
      
    User getOne(Integer id);  
  
    void insert(User user);  
  
    void update(User user);  
  
    void delete(Integer id);  
  
}