SQL SERVER 2000 高效分页查询语句

        ///

        /// 将已经存在的SQL语句包装成分页SQL存储过程。
        ///

        /// 已经存在的SQL语句。
        /// 对于已经存在的SQL语句中能唯一标识的字段名称。
        /// 对于key在SQL中的类型名称。
        /// 分页起始记录索引号。
        /// 每页最大记录数。
        /// 分页SQL存储过程语句。
        public static string WrapPagingProcedure(string sourceSql, string key, string keyType, int? startRowIndex, int? maximumRows)
        {
            if (startRowIndex == null || maximumRows == null)
            {
                return sourceSql;
            }
            startRowIndex++;

            string sql =
                "DECLARE @PK " + keyType + " " +
                "DECLARE @tblPK TABLE(PK " + keyType + " NOT NULL PRIMARY KEY) " +
                "DECLARE @PagingSize int " +
                "DECLARE PagingCursor CURSOR DYNAMIC READ_ONLY FOR " +
                "SELECT " + key + " FROM(" + sourceSql + ") AS T " +
                "OPEN PagingCursor " +
                "FETCH RELATIVE " + startRowIndex.ToString() + " FROM PagingCursor INTO @PK " +
                "SET @PagingSize = " + maximumRows.ToString() + " " +
                "WHILE @PagingSize > 0 AND @@FETCH_STATUS = 0 " +
                "BEGIN " +
                "   INSERT @tblPK(PK) VALUES(@PK) " +
                "   FETCH NEXT FROM PagingCursor INTO @PK " +
                "   SET @PagingSize = @PagingSize - 1 " +
                "END " +
                "CLOSE PagingCursor " +
                "DEALLOCATE PagingCursor " +
                "SELECT * FROM(" + sourceSql + ") AS T INNER JOIN @tblPK temp ON T." + key + " = temp.PK ";

            return sql;
        }