Unable to find TableMapping["cars"] or DataTable "cars"

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Hello everyone!

I have a problem, and for several a hours i try to found what i'm doing wrong.
So, i want to delete a record from a table(i use acces). I create a combobox where i put all id's cars. But i receive this error : "Unable to find TableMapping["cars"] or DataTable "cars""
Bellow is the code, please help with a solution.

private void button1_Click(object sender, EventArgs e)
{
string str = comboBox1.Text;
OleDbConnection myConex = new OleDbConnection(sirConex);

string deletecar = "Delete from cars where id_car=@str";
OleDbCommand cmd = new OleDbCommand(deletecar, myConex);

cmd.Parameters.Add("@str", OleDbType.Char).Value = str;

mda.InsertCommand = cmd;

try
{
mda.Update(mds,"cars");

}

catch (Exception excpt)
{
MessageBox.Show("Error:" + excpt.Message);

}
}

Posted 6-Jan-10 12:15pm

Madalin Dobrin

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Christian Graus · Answer 1 · 2010-01-06T12:27:00

I assume you have a table called cars ? It looks a bit backwards to me that you'd set an 'insertcommand' to delete. It's also obviously hideous that you'd doing this in the presentation layer, but I assume it's just learning code. What is mda ? Why don't you just run the SQL without using it ?

DABBee · Answer 2 · 2010-01-06T12:34:00

Solution 2

Where is your Connection.Open ?

Posted 6-Jan-10 12:34pm

DABBee

Madalin Dobrin · Answer 3 · 2010-01-06T12:40:00

Solution 3

Yes, i have a table cars.
mda is declared like this

OleDbDataAdapter mda=new OleDbDataAdapter();

Posted 6-Jan-10 12:40pm

Madalin Dobrin

Christian Graus · Answer 4 · 2010-01-06T12:49:00

OK - I've never used that, I just write straight SQL commands through a straight connection. I think the other guy is right, I didn't know what you were using, so I didn't look for an open command, but it's not there. Here is the MSDN sample for this class:

OleDbDataAdapter adapter = new OleDbDataAdapter(selectCommand, connection);

    adapter.MissingSchemaAction = MissingSchemaAction.AddWithKey;

    // Create the Insert, Update and Delete commands.
    adapter.InsertCommand = new OleDbCommand(
        "INSERT INTO Customers (CustomerID, CompanyName) " +
        "VALUES (?, ?)");

    adapter.UpdateCommand = new OleDbCommand(
        "UPDATE Customers SET CustomerID = ?, CompanyName = ? " +
        "WHERE CustomerID = ?");

    adapter.DeleteCommand = new OleDbCommand(
        "DELETE FROM Customers WHERE CustomerID = ?");

    // Create the parameters.
    adapter.InsertCommand.Parameters.Add("@CustomerID", 
        OleDbType.Char, 5, "CustomerID");
    adapter.InsertCommand.Parameters.Add("@CompanyName", 
        OleDbType.VarChar, 40, "CompanyName");

    adapter.UpdateCommand.Parameters.Add("@CustomerID", 
        OleDbType.Char, 5, "CustomerID");
    adapter.UpdateCommand.Parameters.Add("@CompanyName", 
        OleDbType.VarChar, 40, "CompanyName");
    adapter.UpdateCommand.Parameters.Add("@oldCustomerID", 
        OleDbType.Char, 5, "CustomerID").SourceVersion = 
        DataRowVersion.Original;

    adapter.DeleteCommand.Parameters.Add("@CustomerID", 
        OleDbType.Char, 5, "CustomerID").SourceVersion = 
        DataRowVersion.Original;

    return adapter;

Two differences I note.

1 - they use a ? to denote the location of a parameter
2 - they use the deletecommand to delete stuff ( makes sense to me )

Unable to find TableMapping["cars"] or DataTable "cars"

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