接口mapper 类
public Long getUserIdByOpenId(String openid);
mapper.xml文件
<select id="getUserIdByOpenId" resultType="java.lang.Long" >
select id from from member where wechat_string=#{0}</select>
接口mapper 类
public Long getUserIdByOpenId(String openid);
mapper.xml文件
<select id="getUserIdByOpenId" resultType="java.lang.Long" >
select id from from member where wechat_string=#{0}