<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.cab.dao.SqlSessionMapper" >
  
  <select id="setGroupContentLength">
    SET SESSION group_concat_max_len = 50;
  </select>

</mapper>