我做的一个查询页面，有几个文本框和下拉框做查询条件
但是当什么条件都不选的话，由于数据库里的数据很多，有10多万条，要查很久才能出来。。
能不能将查询的结果分页显示？我不想只查前n条。。还有，我用的是第三方控件gridcontrol做的。不知道有没有分页显示查询结果的功能？如果有的话应该怎么做？
但是当什么条件都不选的话，由于数据库里的数据很多，有10多万条，要查很久才能出来。。
能不能将查询的结果分页显示？我不想只查前n条。。还有，我用的是第三方控件gridcontrol做的。不知道有没有分页显示查询结果的功能？如果有的话应该怎么做？
@PageSize int, --每页显示条数
@PageIndex int, --当前是第几页
@totalRows int output, --总行数
@totalPages int output --总页数
as
declare @startId int
declare @endId int
set @startId = @PageSize*(@PageIndex-1)+1
set @endId = @startId+@PageSize-1
select @totalRows=COUNT(*) from Books
set @totalPages=@totalRows/@PageSize
if(@totalRows%@PageSize != 0) --如果总行数除每页显示数据量的值不等于0,则总页数得加1
begin
set @totalPages=@totalPages+1
end
declare @IndexTable table(Id int identity(1,1) ,nId int)
insert into @IndexTable select Id from Books
select * from @IndexTable as t ,Books as b where t.Id>=@startId and t.Id<=@endId and t.nId=b.Id
go
declare @tr int --总行数
declare @tp int --总页数
exec PageNum 4,2,@tr output ,@tp output
print '这是总页数'+convert(varchar,@tp) --数据转换
print @tr 2、不一定要用存储过程，可以一次性读到DataTable后，再做处理 private int pageSize = 0; //每页显示行数
private int pageCurrent = 0; //当前页号
private int pageCount = 0; //页数＝总记录数/每页显示行数
private int nCurrent = 0; //当前记录行号
private int nMax = 0; //总记录数
private DataTable srcTable = null; //元数据 private void First_Click(object sender, EventArgs e)
{
try
{
pageCurrent = 1; //当前页数从1开始
nCurrent = 0; //当前记录数从0开始 if (srcTable == null || srcTable.Rows.Count == 0)
return; DataTable table = LoadPageData();
ChangeDataSoure(table); First.Enabled =false;
Prev.Enabled = false;
Next.Enabled = true;
End.Enabled = true;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
} private void Prev_Click(object sender, EventArgs e)
{
try
{
pageCurrent--;
nCurrent = pageSize * (pageCurrent - 1); if (srcTable == null || srcTable.Rows.Count == 0)
return;
DataTable table = LoadPageData();
ChangeDataSoure(table); bool b = pageCurrent <= 1 ? false : true;
First.Enabled = b;
Prev.Enabled = b;
Next.Enabled = true;
End.Enabled = true;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
} private void Next_Click(object sender, EventArgs e)
{
try
{
pageCurrent++;
nCurrent = pageSize * (pageCurrent - 1); if (srcTable == null || srcTable.Rows.Count == 0)
return;
DataTable table = LoadPageData();
ChangeDataSoure(table); bool b = pageCurrent >= pageCount ? false : true;
Next.Enabled = b;
End.Enabled = b; First.Enabled = true;
Prev.Enabled = true;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
} private void End_Click(object sender, EventArgs e)
{
try
{
pageCurrent = pageCount;
nCurrent = pageSize * (pageCurrent - 1); if (srcTable == null || srcTable.Rows.Count == 0)
return; DataTable table = LoadPageData();
ChangeDataSoure(table); Next.Enabled =false;
End.Enabled = false;
First.Enabled = true;
Prev.Enabled = true;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
} private void InitPageSet()
{
pageSize = 30; //设置页面行数
nMax = srcTable.Rows.Count;
pageCount = (nMax / pageSize); //计算出总页数 if ((nMax % pageSize) > 0)
{
pageCount++;
} pageCurrent = 1; //当前页数从1开始
nCurrent = 0; //当前记录数从0开始 First.Enabled =false;
Prev.Enabled = false; bool b = pageCurrent == pageCount ? false : true;
Next.Enabled = b;
End.Enabled = b;
} private DataTable LoadPageData()
{
int nStartPos = 0; //当前页面开始记录行
int nEndPos = 0; //当前页面结束记录行
DataTable dtTemp = null;
if (srcTable == null || srcTable.Rows.Count == 0)
return srcTable;
try
{
dtTemp = srcTable.Clone(); //克隆DataTable结构框架
if (pageCurrent == pageCount)
{
nEndPos = nMax;
}
else
{
nEndPos = pageSize * pageCurrent;
} nStartPos = nCurrent;
//从元数据源复制记录行
for (int i = nStartPos; i < nEndPos; i++)
{
dtTemp.ImportRow(srcTable.Rows[i]);
nCurrent++;
} textEdit1.Text = pageCurrent.ToString();
Page.Text = string.Format("/{0}页", pageCount);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message + "LoadPageData");
}
return dtTemp;
} private void ChangeDataSoure(DataTable table)
{
if (table == null)
return;
gridView1.Columns.Clear();
gridControl1.DataSource = null;
gridControl1.DataSource = table; }