在mybatis中难免会需要自己来手写sql,下面带来CURD的简单写法
1.select
<select id="getPerson" parameterType="Long" resultType="cn.xx.model.Person">
SELECT p.name,p.age,p.sex
FROM person p
<WHERE>
p.id = #{id}
</WHERE>
</select>
Person getPerson(Long id);
2.insert
<insert id="insertPerson" parameterType="cn.xx.model.Person">
INSERT INTO person
VALUES (#{id},#{name},#{age},#{sex})
</insert>
<insert id="insertPerson" parameterType="cn.xx.model.Person">
INSERT INTO STUDENT_TBL (id,name,age,sex)
VALUES (#{id},#{name},#{age},#{sex})
</insert>
int insertPerson (Person p);
3.update
<update id="updatePerson">
update pserson
<set>
name=#{name},age=#{age},sex=#{sex}
</set>
<where>
id=#{id}
</where>
</update>
int updatePerson (@Param("id")Long id,@Param("name")String name,@Param("age")Integer age,@Param("sex")Integer sex);
4.delete
<delete id="deletePerson" parameterType="Long">
DELETE FROM person WHERE id = #{id}
</delete>
int deletePerson(Long id);
个别参数解释
id 唯一标识,也是映射接口中的方法
parameterType 参数类型,与接口参数类型一致
resultType 返回结果类型,与接口返回值一致
resultMap 引用的外部resultMap(resultType 与resultMap 不能并用)