1，mybatis在spring boot下的2種使用模式

無配置文件註解版

application.properties添加相關配置

mybatis.type-aliases-package=com.neo.entity

spring.datasource.driverClassName = com.mysql.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8
spring.datasource.username = root
spring.datasource.password = root
 

springboot會自動加載spring.datasource.*相關配置，數據源就會自動註入到sqlSessionFactory中，sqlSessionFactory會自動註入到Mapper中，對了你一切都不用管了，直接拿起來使用就行了。
在啟動類中添加對mapper包掃描@MapperScan

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

或者直接在Mapper類上面添加註解@Mapper,建議使用上面那種，不然每個mapper加個註解也挺麻煩的

開發Mapper，第三步是最關鍵的一塊，sql生產都在這裏

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);

}
 

Spring Boot學習總結三