批量删除和单个删除
contoller

@RequestMapping("/delete")
    public R delete(@RequestBody Long[] ids){
        yonghuService.deleteyonghu(Arrays.asList(ids));
        return R.ok();
    }

dao层

//    批量删除用户
    Long deleteLanguageBatch(List<Long> list);

service层

   Long deleteyonghu(List<Long> id);

serviceimpl层

@Override
    public Long deleteyonghu(List<Long> id) {
        return yonghuDao.deleteLanguageBatch(id);
    }

xml文件
```java
<!--	批量删除用户-->
	<!--批量删除-->
	<delete id="deleteLanguageBatch">
		delete from yonghu where
		<foreach collection="list" item="key" separator="or">
			id=#{key}
		</foreach>
	</delete>

多个条件是或者的关系，写法如下：
SELECT * FROM table_1 WHERE 条件1 OR 条件2;
或者关系查询，只要满足一个条件就会被查询出来。
如果多个条件都满足才查询出来，需要使用并且的关系：
SELECT * FROM table_1 WHERE 条件1 AND 条件2;
AND 的优先级高于 OR，使用的过程中请注意。

多条件模糊查询

<resultMap id="BaseResultMap" type="com.entity.Yonghu">
		<id column="id" jdbcType="INTEGER" property="id" />
		<result column="yonghuming" jdbcType="VARCHAR" property="yonghuming" />
		<result column="xingming" jdbcType="VARCHAR" property="xingming" />
		<result column="mima" jdbcType="VARCHAR" property="mima" />
		<result column="xingbie" jdbcType="VARCHAR" property="xingbie" />
		<result column="dianhua" jdbcType="VARCHAR" property="dianhua" />
		<result column="youxiang" jdbcType="VARCHAR" property="youxiang" />
		<result column="addtime" jdbcType="VARCHAR" property="addtime" />
	</resultMap>
<select id="getyonghutiaojian" resultMap="BaseResultMap" parameterType="com.entity.Yonghu">
				select *  from yonghu
		<where>
			<if test="yonghuming !=null and yonghuming !=''">
				and yonghuming like concat('%',#{yonghuming},'%')
			</if>
			<if test="xingming !=null and xingming !=''">
				and xingming like concat('%',#{xingming},'%')
			</if>
		</where>
	</select>

今天就记录一下，没有写完