合并mysql 字符串到数组
CREATEFUNCTION `str_array_merge`(`ids` varchar(1024),`id` varchar(128)) RETURNS varchar(1024)NO SQL
BEGIN
IF ISNULL(ids) or ids='' THEN
RETURN id;
END IF;
IF ISNULL(id) or id='' THEN
RETURN ids;
END IF;
IF FIND_IN_SET(id,ids) = 0 THEN
RETURN concat(ids,',',id);
ELSE
RETURN idS;
END IF;
END
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