OleDbCommand.Parameters Property

Definition

public:
 property System::Data::OleDb::OleDbParameterCollection ^ Parameters { System::Data::OleDb::OleDbParameterCollection ^ get(); };
[System.Data.DataSysDescription("DbCommand_Parameters")]
public System.Data.OleDb.OleDbParameterCollection Parameters { get; }
member this.Parameters : System.Data.OleDb.OleDbParameterCollection
Public ReadOnly Property Parameters As OleDbParameterCollection

Property Value

The parameters of the SQL statement or stored procedure. The default is an empty collection.

Attributes

Examples

The following example creates an OleDbCommand and displays its parameters. To accomplish this, the method is passed an OleDbConnection, a query string that is an SQL SELECT statement, and an array of OleDbParameter objects.

public void CreateMyOleDbCommand(OleDbConnection connection,
    string queryString, OleDbParameter[] parameters) 
{
    OleDbCommand command = new OleDbCommand(queryString, connection);
    command.CommandText = 
        "SELECT CustomerID, CompanyName FROM Customers WHERE Country = ? AND City = ?";
    command.Parameters.Add(parameters);

    for (int j=0; j<parameters.Length; j++)
    {
        command.Parameters.Add(parameters[j]) ;
    }

    string message = "";
    for (int i = 0; i < command.Parameters.Count; i++) 
    {
        message += command.Parameters[i].ToString() + "\n";
    }
    Console.WriteLine(message);
}
 Public Sub CreateMyOleDbCommand(connection As OleDbConnection, _
   queryString As String, parameters() As OleDbParameter)

    Dim command As New OleDbCommand(queryString, connection)
    command.CommandText = _
       "SELECT CustomerID, CompanyName FROM Customers WHERE Country = ? AND City = ?"
    command.Parameters.Add(parameters)

    Dim j As Integer
    For j = 0 To command.Parameters.Count - 1
       command.Parameters.Add(parameters(j))
    Next j

    Dim message As String = ""
    Dim i As Integer
    For i = 0 To command.Parameters.Count - 1
        message += command.Parameters(i).ToString() + ControlChars.Cr
    Next i
    Console.WriteLine(message)
End Sub

Remarks

The OLE DB .NET Provider does not support named parameters for passing parameters to an SQL statement or a stored procedure called by an OleDbCommand when CommandType is set to Text. In this case, the question mark (?) placeholder must be used. For example:

SELECT * FROM Customers WHERE CustomerID = ?

Therefore, the order in which OleDbParameter objects are added to the OleDbParameterCollection must directly correspond to the position of the question mark placeholder for the parameter in the command text.

Note

If the parameters in the collection do not match the requirements of the query to be executed, an error may result.

For more information, see Configuring Parameters and Parameter Data Types.

Applies to

See also