public static void DeriveParameters(MySqlCommand command)
{
if (command.CommandType != CommandType.StoredProcedure)
{
throw new InvalidOperationException(Resources.CanNotDeriveParametersForTextCommands);
}
string text = command.CommandText;
if (text.IndexOf(".") == -1)
{
text = command.Connection.Database + "." + text;
}
try
{
ProcedureCacheEntry procedure = command.Connection.ProcedureCache.GetProcedure(command.Connection, text, null);
command.Parameters.Clear();
foreach (MySqlSchemaRow current in procedure.parameters.Rows)
{
MySqlParameter mySqlParameter = new MySqlParameter();
mySqlParameter.ParameterName = string.Format("@{0}", current["PARAMETER_NAME"]);
if (current["ORDINAL_POSITION"].Equals(0) && mySqlParameter.ParameterName == "@")
{
mySqlParameter.ParameterName = "@RETURN_VALUE";
}
mySqlParameter.Direction = MySqlCommandBuilder.GetDirection(current);
bool unsigned = StoredProcedure.GetFlags(current["DTD_IDENTIFIER"].ToString()).IndexOf("UNSIGNED") != -1;
bool realAsFloat = procedure.procedure.Rows[0]["SQL_MODE"].ToString().IndexOf("REAL_AS_FLOAT") != -1;
mySqlParameter.MySqlDbType = MetaData.NameToType(current["DATA_TYPE"].ToString(), unsigned, realAsFloat, command.Connection);
if (current["CHARACTER_MAXIMUM_LENGTH"] != null)
{
mySqlParameter.Size = (int)current["CHARACTER_MAXIMUM_LENGTH"];
}
if (current["NUMERIC_PRECISION"] != null)
{
mySqlParameter.Precision = Convert.ToByte(current["NUMERIC_PRECISION"]);
}
if (current["NUMERIC_SCALE"] != null)
{
mySqlParameter.Scale = Convert.ToByte(current["NUMERIC_SCALE"]);
}
if (mySqlParameter.MySqlDbType == MySqlDbType.Set || mySqlParameter.MySqlDbType == MySqlDbType.Enum)
{
mySqlParameter.PossibleValues = MySqlCommandBuilder.GetPossibleValues(current);
}
command.Parameters.Add(mySqlParameter);
}
}
catch (InvalidOperationException ex)
{
throw new MySqlException(Resources.UnableToDeriveParameters, ex);
}
}