Defining more parameters than a query needs

Question

Hi.
When I run the following code, I get the error "ORA-01036: illegal variable name/number" .
The problem is that I currently define more parameters than the query needs. Thats because I don't know how many bind variables the query uses, and I would not like to parse the query ...
I don't understand why I have to define exactly the same number of parameters, and in the exact order ... It doesn't make sense. As bind variables have names, there should be no problem passing more parameters or parameters in a different order: the binding should be done by name...
I'm currently using Oracle10g, ODP.NET and .NET Framework 2.0.
I would appreciate any help ...
Thank you.
Ricardo Coimbras
===== BEGIN VB.NET CODE =====
Sub Execute_Query(ByVal SqlString as String)
Dim ObjCmd As OracleCommand
Dim DataAdap As OracleDataAdapter
Dim outDsCorpo As DataSet
Dim Constroi_Conn_String_Oracle As String
Dim mObjConnOracle As OracleConnection
Constroi_Conn_String_Oracle = "User ID=uuu" & _
";Password=ppp" & _
";Data Source=bd" & _
";Pooling=false"
mObjConnOracle = New OracleConnection(Constroi_Conn_String_Oracle)
mObjConnOracle.Open()
ObjCmd = mObjConnOracle.CreateCommand()
ObjCmd.CommandType = CommandType.Text
ObjCmd.CommandText = SqlString
ObjCmd.Parameters.Add("p1", OracleDbType.Char, 3, "001", ParameterDirection.Input)
ObjCmd.Parameters.Add("p2", OracleDbType.Char, 3, "001", ParameterDirection.Input)
DataAdap = New OracleDataAdapter(ObjCmd)
outDsCorpo = New DataSet()
DataAdap.Fill(outDsCorpo)
GridView1.DataSource = outDsCorpo
GridView1.DataBind()
DataAdap = Nothing
ObjCmd = Nothing
mObjConnOracle.Close()
mObjConnOracle.Dispose()
mObjConnOracle = Nothing
End Sub
Execute_Query "select * from map.t_mapa_def where mapa_def_cod = :p1 order by mapa_def_cod"
===== END VB.NET CODE =====

Answer 1

Hi,
BindByPosition is the default behavior as per the docs, and you can change that by setting cmd.BindByName=true which adds a little bit of extra overhead.
That wont fix the error seen when binding a random number of parameters to the statement though. You need to bind the correct number and types of parameters.
Greg