ORA-01795: maximum number of expressions in a list is 1000

///

        /// 构造ORACLE查询中IN条件超过1000个键值后拆分的条件 2009年6月5日 kitleer
        ///

        /// 主键ID集合:形式为'key1','key2','key3'...
        /// 作为条件的字段名称
        ///
        ///
        public static string Ora01795(string keys, string field)
        {
            string tempSql = string.Empty;
            int idslen = keys.Split(',').Length;
            int reply = Convert.ToInt32(System.Math.Ceiling((double)idslen / (double)1000));
            for (int i = 0; i < reply; i++)
            {
                string tempids = string.Empty;
                for (int j = 0; j < 1000; j++)
                {
                    if (idslen > j + i * 1000)
                    {
                        if (!string.IsNullOrEmpty(keys.Split(',')[j + i * 1000]))
                            tempids += string.Format("{0},", keys.Split(',')[j + i * 1000]);
                    }
                }
                if (tempids.EndsWith(","))
                    tempids = tempids.Substring(0, tempids.Length - 1);
                tempSql += string.Format("{1} in ({0}) or ", tempids, field);
            }
            tempSql += "1<>1";
            return tempSql;
        }