Salad <oil@vinegar.com> wrote in message news:<mxNtc.14827$be.7102@newsread2.news.pas.earth link.net>...[color=blue]
> Joe wrote:
>[color=green]
> > Hi All,
> >
> > I am new to using the Access DB and I need some help if someone
> > is able to give it to me. What I want to do is get the names of
> > the columns of certain tables. Not the data in the table but the
> > table column names.
> >
> > I've seen other posts that suggest using the SQL command DESCRIBE
> > but I can't get it to work for some reason. Other posts have code
> > samples but they're written in
VB which I am not familiar with. I
> > am looking for a piece of sample code written in C# using the
> > OleDbConnection classes, if that is possible. An SQL command would
> > be great but from what I've read there is no DESCRIBE command or
> > an equivalent. Can someone help me out?
> >
> > Thanks in advance for any help or direction!
> >
> > Sincerely,
> > Joe[/color]
>
> This link may help. I've cut some of the code out from one of the
> response that may help you. I think part of it should show you the
> properties in the collection you need. Not my forte tho.
>
>
http://groups.google.com/groups?hl=e...6btnG%3DSearch
>
> Option Strict On
> Module Main
> 'microsoft adox ext 2.7 for dll and security
> Public Sub Main()
> Dim catNewDB As ADOX.Catalog
> catNewDB = New ADOX.Catalog
> If System.IO.File.Exists("C:\db1.mdb") Then
> System.IO.File.Delete("C:\db1.mdb")
> System.IO.File.Delete("C:\db2.mdb")
> End If
> catNewDB.Create("Provider=Microsoft.Jet.OLEDB.4.0; " & "Data
> Source=C:\db1.mdb")
> catNewDB.Create("Provider=Microsoft.Jet.OLEDB.4.0; " & "Data
> Source=C:\db2.mdb")
> catNewDB = Nothing
> catNewDB = Nothing
> Dim conn1 As OleDb.OleDbConnection = New OleDb.OleDbConnection
> Dim conn2 As OleDb.OleDbConnection = New OleDb.OleDbConnection
> conn1.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data
> Source=C:\db1.mdb;User Id=admin;Password=;"
> conn2.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data
> Source=C:\db2.mdb;User Id=admin;Password=;"
> conn1.Open()
> Dim cmd1 As New OleDb.OleDbCommand( _
> "CREATE TABLE tbl1 (a int NOT NULL," & _
> "b Char(20)," & _
> "CONSTRAINT [pk_a] PRIMARY KEY (a))", conn1)
> cmd1.ExecuteNonQuery()
> conn2.Open()
> Dim cmd2 As New OleDb.OleDbCommand( _
> "CREATE TABLE tbl1 (a int NOT NULL," & _
> "b Char(20)," & _
> "CONSTRAINT [pk_a] PRIMARY KEY (a))", conn2)
> cmd2.ExecuteNonQuery()
> Try
> For i As Integer = 1 To 9
> cmd1.Parameters.Clear()
> cmd1.CommandText = "INSERT INTO tbl1 (a,b) VALUES (@a,@b)"
> cmd1.Parameters.Add(New OleDb.OleDbParameter("@a",
> OleDb.OleDbType.Integer)).Value = i
> cmd1.Parameters.Add(New OleDb.OleDbParameter("@b",
> OleDb.OleDbType.Char, 20)).Value = Chr(64 + i)
> cmd1.ExecuteNonQuery()
> Next
> For i As Integer = 4 To 12 Step 2
> cmd2.Parameters.Clear()
> cmd2.CommandText = "INSERT INTO tbl1 (a,b) VALUES (@a,@b)"
> cmd2.Parameters.Add(New OleDb.OleDbParameter("@a",
> OleDb.OleDbType.Integer)).Value = i
> cmd2.Parameters.Add(New OleDb.OleDbParameter("@b",
> OleDb.OleDbType.Char, 20)).Value = Chr(75 + i)
> cmd2.ExecuteNonQuery()
> Next
> cmd1.CommandText = "Select * from tbl1"
> Dim da1 As OleDb.OleDbDataAdapter = New
> OleDb.OleDbDataAdapter(cmd1)
> Dim ds1 As DataSet = New DataSet
> Dim dt1 As New DataTable("tbl1")
> Dim dca As New DataColumn("a", Type.GetType("System.Int32"))
> Dim dcb As New DataColumn("b", Type.GetType("System.String"))
> dt1.Columns.Add(dca)
> dt1.Columns.Add(dcb)
> ds1.Tables.Add(dt1)
> cmd1.CommandText = "Select a, b from tbl1"
> Dim rdr As OleDb.OleDbDataReader
> rdr = cmd1.ExecuteReader()
> While rdr.Read()
> Dim dr As DataRow
> dr = ds1.Tables(0).NewRow
> dr("a") = rdr.GetInt32(0)
> dr("b") = rdr.GetString(1)
> ds1.Tables(0).Rows.Add(dr)
> End While
> rdr.Close()
> ds1.AcceptChanges()
> cmd2.CommandText = "Select * from tbl1"
> cmd2.Connection = conn2
> Dim da2 As OleDb.OleDbDataAdapter = New
> OleDb.OleDbDataAdapter(cmd2)
> Dim cmb2 As OleDb.OleDbCommandBuilder = New
> OleDb.OleDbCommandBuilder(da2)
> Dim ds2 As DataSet = New DataSet
> conn2.Close()
> da2.Fill(ds2)
> For i As Integer = 0 To ds1.Tables(0).Rows.Count - 1
> Dim swN As Boolean = True
> For y As Integer = 0 To ds2.Tables(0).Rows.Count - 1
> Dim a As Integer = ds2.Tables(0).Rows.Count - 1
> If CInt(ds1.Tables(0).Rows(i).Item(0)) =
> CInt(ds2.Tables(0).Rows(y).Item(0)) Then
> ds2.Tables(0).Rows(y).Item(1) =
> ds1.Tables(0).Rows(i).Item(1)
> swN = False
> Exit For
> End If
> Next
> If swN Then
> Dim dr As DataRow
> dr = ds2.Tables(0).NewRow
> For y As Integer = 0 To
> ds1.Tables(0).Rows(i).ItemArray.Length - 1
> dr(y) = ds1.Tables(0).Rows(i).ItemArray(y)
> Next
> ds2.Tables(0).Rows.Add(dr)
> End If
> Next
> da2.Update(ds2)
> Catch ex As Exception
> MessageBox.Show(ex.ToString)
> End Try
> conn1.Close()
> conn2.Close()
> End Sub
> End Module[/color]
Hi Salad,
Thanks you for the reply and you help. After some more research, I
was able to find a solution. I will post it here for anyone else who
may be looking into the same problem. This little snipet of code gets
the name of the table, does some filtering, and gets the column name
and its type in its ordinal position. In other words, the columns
wind up being in the order in which they were created. If you do not
end up doing this sorting the columns wind up in aphabetical order.
The columns data type is stored as an integer and I don't know what
the correct mapping it so I just store the info as such in a class
called TableInfo that I created. Anyway, here it is.
private void GetTableInfo()
{
DataRowView drvCols = null;
DataTable dtCols = null;
DataView dvColumns = null;
TableInfo tabInfoObj = null;
string sTableNm = null;
string sNamePrefix = null;
string sColName = null;
int nColType = 0;
// Get the list of tables that there are.
DataTable schemaTab =
m_oleDbSrcConn.GetOleDbSchemaTable(OleDbSchemaGuid .Tables,
new Object[] {null, null, null, "TABLE"});
for (int i = 0; i < schemaTab.Rows.Count; i++)
{
sTableNm = schemaTab.Rows[i].ItemArray[2].ToString();
sNamePrefix = sTableNm.Substring(0, 4);
if ((sTableNm != "_NEW_TABLES") && (sNamePrefix != "temp"))
{
tabInfoObj = new TableInfo(sTableNm);
// Get the column name and its type and sort them
// according to their position in the table.
dtCols = m_oleDbSrcConn.GetOleDbSchemaTable(
OleDbSchemaGuid.Columns,
new Object[]{null,null, sTableNm, null});
dvColumns = new DataView(dtCols);
dvColumns.Sort = "ORDINAL_POSITION";
// Get the column names and their types.
for (int j=0; j< dvColumns.Count; j++)
{
// Get the name of the column.
drvCols = dvColumns[j];
sColName = drvCols.Row.ItemArray[3].ToString();
// Get columns data type code and save it off.
nColType = Convert.ToInt32(drvCols.Row.ItemArray[11]);
tabInfoObj.AddColumn(sColName, nColType);
m_alTables.Add(tabInfoObj);
}
} // if
} // for
}
I hope this helps someone!
Later,
Joe
Getting column names of a table in C# using OleDB 
