存储过程的分页方法

CREATE PROCEDURE Sql_Conn_Sort
(
@tblName   varchar(255),       -- 表名
@strGetFields varchar(1000) = '*',  -- 需要返回的列
@fldName varchar(255)='',      -- 排序的字段名
@PageSize   int ,          -- 页尺寸
@PageIndex  int ,           -- 页码
@doCount  bit = 0,   -- 是否返回记录总数, 非 0 值则返回,如果是0则返回一个DataTable
@OrderType bit = 0,  -- 设置排序类型, 非 0 值则降序
@strWhere  varchar(1500)=''  -- 查询条件 (注意: 不要加 where)
)
AS

declare @strSQL   varchar(5000)       -- 主语句

declare @strTmp   varchar(110)        -- 临时变量

declare @strOrder varchar(400)        -- 排序类型

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

--以上代码的意思是如果@doCount传递过来的不是0，就执行总数统计。以下的所有代码都是@doCount为0的情况

else

begin

if @OrderType != 0

begin

set @strTmp = '<(select min'

set @strOrder = ' order by ' + @fldName +' 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 ' + @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

--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 ' + @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

/// <summary>
/// 执行存储过程
/// </summary>
/// <param name="storedProcName">存储过程名</param>
/// <param name="parameters">存储过程参数</param>
/// <param name="tableName">DataTable结果中的表名</param>
/// <returns>DataTable</returns>
public static DataTable RunProcedureTable(string storedProcName, IDataParameter[] parameters)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
DataTable dt = new DataTable();
connection.Open();
SqlDataAdapter sqlDA = new SqlDataAdapter();
sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
sqlDA.Fill(dt);
connection.Close();
return dt;
}

}

/// <summary>
/// 构建 SqlCommand 对象(用来返回一个结果集，而不是一个整数值)
/// </summary>
/// <param name="connection">数据库连接</param>
/// <param name="storedProcName">存储过程名</param>
/// <param name="parameters">存储过程参数</param>
/// <returns>SqlCommand</returns>
private static SqlCommand BuildQueryCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
{
SqlCommand command = new SqlCommand(storedProcName, connection);
command.CommandType = CommandType.StoredProcedure;
foreach (SqlParameter parameter in parameters)
{
command.Parameters.Add(parameter);
}
return command;
}

public static DataTable Get_DateTableByProc(string tblName, string retColumns, string orderfld, int PageSize, int pageIndex, int isCount, int orderType, string strWhere)
{
IDataParameter[] parameters = new SqlParameter[8];
parameters[0] = new SqlParameter("@tblName", SqlDbType.NVarChar, 255);//表名
parameters[1] = new SqlParameter("@strGetFields", SqlDbType.NVarChar, 1000);//需要返回的列
parameters[2] = new SqlParameter("@fldName", SqlDbType.NVarChar, 255);//排序的字段名
parameters[3] = new SqlParameter("@PageSize", SqlDbType.Int, 4);//每页显示条数
parameters[4] = new SqlParameter("@pageIndex", SqlDbType.Int, 4);//显示第几页
parameters[5] = new SqlParameter("@doCount", SqlDbType.Int, 4);//是否返回记录总数, 非 0 值则返回
parameters[6] = new SqlParameter("@orderType", SqlDbType.Int, 4);//设置排序类型, 非 0 值则降序
parameters[7] = new SqlParameter("@strWhere", SqlDbType.NVarChar, 500);// 查询条件 (注意: 不要加 where)
parameters[0].Value = tblName;
parameters[1].Value = retColumns;
parameters[2].Value = orderfld;
parameters[3].Value = PageSize;
parameters[4].Value = pageIndex;
parameters[5].Value = isCount;
parameters[6].Value = orderType;
parameters[7].Value = strWhere;

try
{
return RunProcedureTable("Sql_Conn_Sort", parameters);
}
catch (Exception)
{

throw;
}
}

public DataTable ListTourismCHM(int iPageSize, int iPageIndex, int iCount, string strWhere)
{
return DbHelperSQL.Get_DateTableByProc("tbTourismCHM", "*", "Title", iPageSize, iPageIndex, iCount, 0, strWhere);
}

private void BindData()
{
string strWhere = " 1=1 ";
if (!ddlSort.SelectedValue.Equals("0"))
{
strWhere += " and sort= " + ddlSort.SelectedValue;
}
if (!txtTitle.Text.Trim().Equals(""))
{
strWhere += " and title like '%" + txtTitle.Text.Trim() + "%'";
}
//TourismCHMBLL tourismCHMBLL = new TourismCHMBLL();
DataTable dt = tourismCHMBLL.ListTourismCHM(AspNetPager1.PageSize, AspNetPager1.CurrentPageIndex, 0, strWhere);

GridViewBandData(gvTourismCHM, dt);

//得到记录的总数
AspNetPager1.RecordCount = int.Parse(tourismCHMBLL.ListTourismCHM(AspNetPager1.PageSize, AspNetPager1.CurrentPageIndex, 1, strWhere).Rows[0][0].ToString());

AspNetPager1.CustomInfoHTML = "记录总数：<b>" + AspNetPager1.RecordCount.ToString() + "</b>";
AspNetPager1.CustomInfoHTML += " 总页数：<b>" + AspNetPager1.PageCount.ToString() + "</b>";
AspNetPager1.CustomInfoHTML += " 当前页：<font color=/"red/"><b>" + AspNetPager1.CurrentPageIndex.ToString() + "</b></font>";
}