MySql高效分页SQL

         public string GetQuerySql(ITSPAreaQueryModel model, object state = null)
         {
             var sqlBuilder = new StringBuilder();
             sqlBuilder.AppendFormat(@"{0}
 /*---Script For Select Top N Rows---*/
 SELECT  SQL_CALC_FOUND_ROWS
         a.Id,
         a.AreaName ,
         a.Location ,
         a.AreaHead ,
         a.Remark ,
         a.RowState,
         a.CreateOn,
         a.CreateBy,
         a.UpdateOn,
         a.UpdateBy
 FROM ITSPArea as a", _SqlComment);
             if (model.RowState == null)
             {
                 sqlBuilder.AppendFormat("{0}WHERE a.RowState IN ( 0,1 )", Environment.NewLine);
             }
             else
             {
                 sqlBuilder.AppendFormat("{0}WHERE a.RowState={1}", Environment.NewLine, model.RowState);
             }
             if (!string.IsNullOrEmpty(model.AreaName))
             {
                 sqlBuilder.AppendFormat("{0}and a.AreaName=@AreaName", Environment.NewLine);
             }
             if (!string.IsNullOrEmpty(model.AreaHead))
             {
                 sqlBuilder.AppendFormat("{0}and a.AreaHead=@AreaHead", Environment.NewLine);
             }
             sqlBuilder.AppendFormat("{0}order by a.CreateOn desc", Environment.NewLine);
             sqlBuilder.AppendFormat("{0}LIMIT {1},{2};", Environment.NewLine, (model.PageIndex - ) * model.PageSize, model.PageSize);
             sqlBuilder.AppendFormat("{0}SELECT FOUND_ROWS()", Environment.NewLine);
             return sqlBuilder.ToString();
         }