Question

Q:

Please , i want to ask ,how to perform a query(select statement) using a parametrized query in Informix database ,with a simple example.
thanks in advance.

EDIT:

i use

IfxConnection and IfxCommand

Answer 1

.NET Framework Data Provider for OLE DB

This is just one connection string sample for the wrapping OleDbConnection class that calls the underlying OLEDB provider. See respective OLE DB provider for more connection strings to use with this class.

Provider=Ifxoledbc;Data Source=dbName@serverName;User ID=myUsername;Password=myPassword;

 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);
}

Hope this will help