用法示意：
INSERT INTO `test` VALUES (1, ‘name‘, ‘daodao,xiaohu,xiaoqin‘);INSERT INTO `test` VALUES (2, ‘name2‘, ‘xiaohu,daodao,xiaoqin‘);INSERT INTO `test` VALUES (3, ‘name3‘, ‘xiaoqin,daodao,xiaohu‘); test1:sql = select * from `test` where ‘daodao‘ IN (`list`);得到结果空值.test2:sql = select * from `test` where FIND_IN_SET(‘daodao‘,`list`);得到三条数据
