Mybatis常用注解简介说明
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Mybatis常用注解简介说明
下文笔者讲述MyBatis的常用注解简介说明,如下所示
| 注解 | 目标 | 对应的XML标签 |
| @CacheNamespace | 类 | |
| @CacheNamespaceRef | 类 | |
| @Results | 方法 | |
| @Result | 方法 | |
| @One | 方法 | |
| @Many | 方法 | |
| @Insert @Update @Delete |
方法 | |
| @InsertProvider @UpdateProvider @DeleteProvider @SelectProvider |
方法 | |
| @Param | 参数 | N/A |
| @Options | 方法 | 映射语句的属性 |
| @select | 方法 |
@Select简单查询
@Select(" Select * from user ")
@Results({
@Result(id = true, column = "id", property = "id"),
@Result(column = "name", property = "name"),
@Result(column = "tel", property = "tel"),
@Result(column = "birth", property = "birth"),
@Result(column = "address", property = "address")
})
List queryAllUser();
@Insert 简单插入
@Insert(" insert into user(name,sex,age) values(#{name},#{sex},#{age} " )
int saveUser(User user);
@Update 简单更新
@Update("update user set name= #{name} ,sex = #{sex},age =#{age} where id = #{id}")
void updateUserById(User user);
@Delete 简单删除
@Delete("delete from user where id =#{id} ")
void deleteById(Integer id);
@One
@Select(" select * from user where id = #{id} ")
@Results(
value = {
@Result(column = "name",property = "name"),
@Result(column = "type",property = "type",
//one指示我们，查询出来的结果只有一个。
one = @One(select="com.xxxx.UserMapper.findTypeById",
//及时加载
fetchType = FetchType.EAGER))
}
)
User findUserById(Integer id);
@Many
@Select(" select * from dept")
@Results({
@Result(id = true, column = "did", property = "did"),
@Result(column = "name", property = "name"),
@Result(column = "address", property = "address"),
@Result(column = "id",property = "emps",
//many指示我们，查询出来的结果有很多个
many = @Many(
//select = sql语句
select = "com.xxxx.EmpMapper.findAllEmpByDid",
//懒加载
fetchType = FetchType.LAZY))
})
List findAllDept();