if @strWhere != '' if @OrderType != 0
begin set @strTmp = '<(select min' set @strOrder = ' order by [' + @OrderfldName +'] desc'--如果@OrderType不是0,就执行降序,这句很重要! end else begin set @strTmp = '>(select max' set @strOrder = ' order by [' + @OrderfldName +'] asc' end if @PageIndex = 1 begin if @strWhere != '' set @strSQL = 'select top ' + str(@PageSize) +' '+@strGetFields+ ' from ' + @tblName + ' where ' + @strWhere + ' ' + @strOrder else set @strSQL = 'select top ' + str(@PageSize) +' '+@strGetFields+ ' from '+ @tblName + ' '+ @strOrder--如果是第一页就执行以上代码,这样会加快执行速度 end else begin--以下代码赋予了@strSQL以真正执行的SQL代码 set @strSQL = 'select top ' + str(@PageSize) +' '+@strGetFields+ ' from ' + @tblName + ' where [' + @OrderfldName + ']' + @strTmp + '(['+ @OrderfldName + ']) from (select top ' + str((@PageIndex-1)*@PageSize) + ' ['+ @OrderfldName + '] from ' + @tblName + ' ' + @strOrder + ') as tblTmp)'+ @strOrder if @strWhere != '' set @strSQL = 'select top ' + str(@PageSize) +' '+@strGetFields+ ' from ' + @tblName + ' where [' + @OrderfldName + ']' + @strTmp + '([' + @OrderfldName + ']) from (select top ' + str((@PageIndex-1)*@PageSize) + ' [' + @OrderfldName + '] from ' + @tblName + ' where ' + @strWhere + ' ' + @strOrder + ') as tblTmp) and ' + @strWhere + ' ' + @strOrder end exec (@strSQL) ----------------------------------------------------------------------
SQLHelper类中写执行存储过程 这是我的数据库操作类.方法有点老,还是三层架构.(mvc也应该差不多.我还木有试试.)
复制代码 代码如下: /// <summary> /// 分页(存储过程) 用法例如下: /// </summary> /// <param>表名(注意:可以多表链接)</param> /// <param>需要返回的列</param> /// <param>主键</param> /// <param>排序的字段名</param> /// <param>页尺寸</param> /// <param>页码</param> /// <param>查询到的记录数</param> /// <param>设置排序类型, desc、asc</param> /// <param>查询条件 (注意: 不要加 where)</param> /// <returns></returns> public static DataTable DbPager( string tblName, string strGetFields, string PkeyfldName, string OrderfldName, int PageSize, int PageIndex, out int doCount, string OrderType, string strWhere) { SqlConnection con = new SqlConnection(ConnString.Value); SqlDataAdapter da = new SqlDataAdapter("DbPager", con); da.SelectCommand.CommandType = CommandType.StoredProcedure; da.SelectCommand.Parameters.Add(new SqlParameter("@tblName", tblName)); da.SelectCommand.Parameters.Add(new SqlParameter("@strGetFields", strGetFields)); da.SelectCommand.Parameters.Add(new SqlParameter("@PkeyfldName", PkeyfldName)); da.SelectCommand.Parameters.Add(new SqlParameter("@OrderfldName", OrderfldName)); da.SelectCommand.Parameters.Add(new SqlParameter("@PageSize", PageSize)); da.SelectCommand.Parameters.Add(new SqlParameter("@PageIndex", PageIndex)); da.SelectCommand.Parameters.Add("@doCount", SqlDbType.Int); da.SelectCommand.Parameters["@doCount"].Direction = ParameterDirection.Output; da.SelectCommand.Parameters.Add(new SqlParameter("@OrderType", OrderType)); da.SelectCommand.Parameters.Add(new SqlParameter("@strWhere", strWhere)); DataSet ds = new DataSet(); da.Fill(ds); doCount = Convert.ToInt32(da.SelectCommand.Parameters["@doCount"].Value); return ds.Tables[0]; } |
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