数据分页是Web应用程序开发中经常使用的一种技术,也是提高Web数据访问性能的主要手段。本文结合ASP.NET,详细给出了两种ASP.NET海量分页数据存储的技术。
存储过程1
- CREATE PROCEDURE pagination
- @tblName varchar(255),
- @strGetFields varchar(1000) = '*',
- @fldName varchar(255)='',
- @PageSize int ,
- @PageIndex int,
- @doCount bit ,
- @OrderType bit ,
- @strWhere varchar(1500) = ''
- AS
- declare @strSQL varchar(5000)
- declare @strTmp varchar(110)
- declare @strOrder varchar(400)
-
- if @doCount != 0
- begin
- if @strWhere !=''
- set @strSQL = "select count(*) as Total from [" + @tblName + "] where "+@strWhere
- else
- set @strSQL = "select count(*) as Total from [" + @tblName + "]"
- end
-
- else
- begin
-
- if @OrderType != 0
- begin
- set @strTmp = "<(select min"
- set @strOrder = " order by [" + @fldName +"] desc"
-
- end
- else
- begin
- set @strTmp = ">(select max"
- set @strOrder = " order by [" + @fldName +"] 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
-
- end
- else
- begin
-
- set @strSQL = "select top " + str(@PageSize) +" "+@strGetFields+ " from ["
- + @tblName + "] where [" + @fldName + "]" + @strTmp + "(["+ @fldName + "]) from (select top " + str((@PageIndex-1)*@PageSize) + " ["+ @fldName + "] from [" + @tblName + "]" + @strOrder + ") as tblTmp)"+ @strOrder
-
- if @strWhere != ''
- set @strSQL = "select top " + str(@PageSize) +" "+@strGetFields+ " from ["
- + @tblName + "] where [" + @fldName + "]" + @strTmp + "(["
- + @fldName + "]) from (select top " + str((@PageIndex-1)*@PageSize) + " ["
- + @fldName + "] from [" + @tblName + "] where " + @strWhere + " "
- + @strOrder + ") as tblTmp) and " + @strWhere + " " + @strOrder
- end
- end
- exec (@strSQL)
- GO
-
- 调用的程序(为了通用性,我写了一个方法,大家可以提意见,也可以对其进行修改,多多交换意见,共同进步)
- private static DataSet GetCustomersData(string tblName, string strGetFields,string fldName, int PageSize, int PageIndex, int doCount, int OrderType, string strWhere)
- {
- string connString = ConfigurationSettings.AppSettings["connstr"];
- SqlConnection conn = new SqlConnection(connString);
- SqlCommand comm = new SqlCommand("pagination3", conn);
-
- comm.Parameters.Add(new SqlParameter("@tblName", SqlDbType.VarChar));//表名
- comm.Parameters[0].Value =tblName ;
- comm.Parameters.Add(new SqlParameter("@strGetFields", SqlDbType.VarChar));//返回的列
- comm.Parameters[1].Value = strGetFields;
- comm.Parameters.Add(new SqlParameter("@fldName", SqlDbType.VarChar));//排序的字段名
- comm.Parameters[2].Value = fldName;
- comm.Parameters.Add(new SqlParameter("@PageSize",SqlDbType.Int));//页尺寸
- comm.Parameters[3].Value = PageSize;
- comm.Parameters.Add(new SqlParameter("@PageIndex", SqlDbType.Int));//页码
- comm.Parameters[4].Value = PageIndex;
- comm.Parameters.Add(new SqlParameter("@doCount", SqlDbType.Int));//是否返回记录总数,0为不返回,1为返回
- comm.Parameters[5].Value = doCount;
- comm.Parameters.Add(new SqlParameter("@OrderType", SqlDbType.Int));//设置排序类型,0为升序,非0为降序
- comm.Parameters[6].Value = OrderType;
- comm.Parameters.Add(new SqlParameter("@strWhere", SqlDbType.VarChar));//where语句
- comm.Parameters[7].Value = strWhere;
- comm.CommandType = CommandType.StoredProcedure;
- SqlDataAdapter dataAdapter = new SqlDataAdapter(comm);
- DataSet ds = new DataSet();
- dataAdapter.Fill(ds);
- return ds;
- }
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存储过程2
- CREATE PROCEDURE [dbo].[GetRecordFromPage]
- @SelectList VARCHAR(2000),
- @TableSource VARCHAR(100),
- @SearchCondition VARCHAR(2000),
- @OrderExpression VARCHAR(1000),
- @PageIndex INT = 1,
- @PageSize INT = 10
- AS
- BEGIN
- IF @SelectList IS NULL OR LTRIM(RTRIM(@SelectList)) = ''
- BEGIN
- SET @SelectList = '*'
- END
- PRINT @SelectList
-
- SET @SearchCondition = ISNULL(@SearchCondition,'')
- SET @SearchCondition = LTRIM(RTRIM(@SearchCondition))
- IF @SearchCondition <> ''
- BEGIN
- IF UPPER(SUBSTRING(@SearchCondition,1,5)) <> 'WHERE'
- BEGIN
- SET @SearchCondition = 'WHERE ' + @SearchCondition
- END
- END
- PRINT @SearchCondition
-
- SET @OrderExpression = ISNULL(@OrderExpression,'')
- SET @OrderExpression = LTRIM(RTRIM(@OrderExpression))
- IF @OrderExpression <> ''
- BEGIN
- IF UPPER(SUBSTRING(@OrderExpression,1,5)) <> 'WHERE'
- BEGIN
- SET @OrderExpression = 'ORDER BY ' + @OrderExpression
- END
- END
- PRINT @OrderExpression
-
- IF @PageIndex IS NULL OR @PageIndex < 1
- BEGIN
- SET @PageIndex = 1
- END
- PRINT @PageIndex
- IF @PageSize IS NULL OR @PageSize < 1
- BEGIN
- SET @PageSize = 10
- END
- PRINT @PageSize
-
- DECLARE @SqlQuery VARCHAR(4000)
-
- SET @SqlQuery='SELECT '+@SelectList+',RowNumber
- FROM
- (SELECT ' + @SelectList + ',ROW_NUMBER() OVER( '+ @OrderExpression +') AS RowNumber
- FROM '+@TableSource+' '+ @SearchCondition +') AS RowNumberTableSource
- WHERE RowNumber BETWEEN ' + CAST(((@PageIndex - 1)* @PageSize+1) AS VARCHAR)
- + ' AND ' +
- CAST((@PageIndex * @PageSize) AS VARCHAR)
-
- PRINT @SqlQuery
- SET NOCOUNT ON
- EXECUTE(@SqlQuery)
- SET NOCOUNT OFF
-
- RETURN @@RowCount
- END
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