แก้ไข

แชร์ผ่าน

OracleCommand.Parameters Property

  • Reference

Definition

Namespace:
System.Data.OracleClient
Assembly:
System.Data.OracleClient.dll

Gets the OracleParameterCollection.

public:
 property System::Data::OracleClient::OracleParameterCollection ^ Parameters { System::Data::OracleClient::OracleParameterCollection ^ get(); };
public System.Data.OracleClient.OracleParameterCollection Parameters { get; }
member this.Parameters : System.Data.OracleClient.OracleParameterCollection
Public ReadOnly Property Parameters As OracleParameterCollection

Property Value

OracleParameterCollection

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

Examples

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

public void CreateOracleCommand(OracleConnection connection,
    string queryString, OracleParameter[] myParamArray)
{

    OracleCommand command = new OracleCommand(queryString, connection);
    command.CommandText =
        "SELECT * FROM Emp WHERE Job = :pJob AND Sal = :pSal";

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

    string message = "";

    for (int i = 0; i < command.Parameters.Count; i++)
        message += command.Parameters[i].ToString() + "\n";

    Console.WriteLine(message);

    using (OracleDataReader row = command.ExecuteReader())
    {
        while(row.Read())
        {
            Console.WriteLine(row.GetValue(0));
        }
    }
}

Public Sub CreateOracleCommand(ByVal connection As OracleConnection, _
ByVal queryString As String, ByVal prmArray() As OracleParameter)

    Dim command As New OracleCommand(queryString, connection)
    command.CommandText = _
        "SELECT * FROM Emp WHERE Job = :pJob AND Sal = :pSal"

    Dim j As Integer
    For j = 0 To prmArray.Length - 1
        command.Parameters.Add(prmArray(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)

    Dim reader As OracleDataReader = command.ExecuteReader
    While reader.Read
        Console.WriteLine(reader.GetValue(0))
    End While

End Sub

Remarks

When the CommandType property is set to StoredProcedure, the CommandText property should be set to the name of the stored procedure. The user may be required to use escape character syntax if the stored procedure name contains any special characters. The command executes this stored procedure when you call one of the Execute methods.

The .NET Framework Data Provider for Oracle does not support the question mark (?) placeholder for passing parameters to an SQL statement called by an OracleCommand of CommandType.Text. In this case, named parameters must be used. For example:

SELECT * FROM Customers WHERE CustomerID = :pCustomerID

When using named parameters in an SQL statement called by an OracleCommand of CommandType.Text, you must precede the parameter name with a colon (:). However, in a stored procedure, or when referring to a named parameter elsewhere in your code (for example, when adding OracleParameter objects to the Parameters property), do not precede the named parameter with a colon (:). The .NET Framework Data Provider for Oracle supplies the colon automatically.

Applies to

See also