I have a question about DataTable
. I retrieve a DataTable
from the database, and one of these columns contains either a 1 or a 0. Now I want to retrieve only the rows with a 1 value of 1 in that column.
The name of the column is ACTIVATE
.
Here is my DataTable
:
DataTable table = new DataTable(TABLE);
//How can I filter here so ACTIVATE == 1?
adapter.Fill(table);
connection.Open();
selectcommand.ExecuteReader();
return table;
Via SQL (preferred)
SELECT * FROM dbo.Table WHERE ACTIVATE = 1
Via Linq-To-Datatable
(in memory):
DataTable tblFiltered = table.AsEnumerable()
.Where(r => r.Field<int>("ACTIVATE") == 1)
.CopyToDataTable();
If you're still on .NET 2, you can use DataTable.Select
:
DataRow[] filteredRows = table.Select("ACTIVATE = 1");
Apart from that, you don't need selectcommand.ExecuteReader()
to fill the table.
DataTable table = new Datatable();
using(var con = new SqlConnection(connectionString))
using(var cmd = new SqlCommand("SELECT * FROM dbo.Table WHERE ACTIVATE = 1", con))
using(var da = new SqlDataAdapter(cmd))
{
da.Fill( table );
}
You simply use DataTable.Select like this:
foundRows = table.Select("ACTIVATE = '1'");
It returns an array of DataRow objects.
DataTable results = table.Select("ACTIVATE = 1").CopyToDataTable();
这应该实现你想要的,基本上你可以像SQL一样查询数据表。
return table;
DataTable results = table.Select("ACTIVATE = 1").CopyToDataTable();
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