SpringBoot学习笔记（1）：配置Mybatis
参考资料：
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);
}
