Oracle Data Access ORA-06512: character string buffer too small

Question

When I call GetTest I get this error:

string buffer too small ORA-06512

This my c# method:

public string GetTEST()
{
    using (var conn = new OracleConnection(System.Configuration.ConfigurationManager.ConnectionStrings["Dbconnection"].ConnectionString))
    {
        OracleCommand cmd = new OracleCommand("Package.GetTEST");
        cmd.BindByName = true;
        cmd.Connection = conn;
        cmd.CommandType = CommandType.StoredProcedure;

        cmd.Parameters.Add("P_OUT_MESSAGE", OracleDbType.Varchar2,1000,ParameterDirection.Output);

        cmd.ExecuteNonQuery();

        var t = cmd.Parameters["P_OUT_MESSAGE"].Value;
    }
}

Oracle Procedure:

PROCEDURE GetTEST
(
  P_OUT_MESSAGE    OUT VARCHAR2 
)
IS
BEGIN
  p_out_message := 'Un problème a été signalé pour votre propriété. Veuillez communiquer avec le Service de l''évaluation au 418 111-7878 ou à l''adresse test@tesst.com';
END;

Answer 1

This is obviously not what you want, but it seems that ODP.NET uses the length of the parameter at the .NET side as the length of the out parameter...

This will fix your issue:

cmd.Parameters.Add("P_OUT_MESSAGE", OracleDbType.Varchar2, 32767, "x".PadRight(500, 'x'), ParameterDirection.Output);

But this is nicer, and although not entirely correct, it works:

cmd.Parameters.Add("P_OUT_MESSAGE", OracleDbType.Clob, ParameterDirection.Output);

Or, even better, if possible, avoid the use of out parameters and use scalar return values or table functions.