public static void DeriveParameters(VirtuosoCommand command)
{
if (command == null)
{
throw new ArgumentNullException("command");
}
if (command.CommandType != CommandType.StoredProcedure)
{
throw new InvalidOperationException("DeriveParameters supports only stored procedures.");
}
VirtuosoConnection connection = (VirtuosoConnection)command.Connection;
if (connection == null)
{
throw new InvalidOperationException("The Connection property is not set.");
}
if (connection.State == ConnectionState.Closed)
{
throw new InvalidOperationException("The connection is closed.");
}
IInnerCommand innerCommand = null;
VirtuosoDataReader reader = null;
try
{
innerCommand = connection.innerConnection.CreateInnerCommand(null);
innerCommand.GetProcedureColumns(command.CommandText);
reader = new VirtuosoDataReader(connection, innerCommand, null, CommandBehavior.Default, false);
command.Parameters.Clear();
while (reader.Read())
{
CLI.InOutType iotype = (CLI.InOutType)reader.GetInt16(reader.GetOrdinal("COLUMN_TYPE"));
ParameterDirection direction;
switch (iotype)
{
case CLI.InOutType.SQL_PARAM_INPUT:
direction = ParameterDirection.Input;
break;
case CLI.InOutType.SQL_PARAM_OUTPUT:
direction = ParameterDirection.Output;
break;
case CLI.InOutType.SQL_PARAM_INPUT_OUTPUT:
direction = ParameterDirection.InputOutput;
break;
case CLI.InOutType.SQL_PARAM_RETURN_VALUE:
direction = ParameterDirection.ReturnValue;
break;
default:
#if MONO
direction = ParameterDirection.Input;
#endif
continue;
}
string name = reader.GetString(reader.GetOrdinal("COLUMN_NAME"));
if (name == "" && iotype == CLI.InOutType.SQL_PARAM_RETURN_VALUE)
{
name = "ReturnValue";
}
CLI.SqlType sqlType = (CLI.SqlType)reader.GetInt16(reader.GetOrdinal("DATA_TYPE"));
DataType type = DataTypeInfo.MapSqlType(sqlType);
if (type == null)
{
throw new SystemException("Unknown data type");
}
int sizeOrdinal = reader.GetOrdinal("COLUMN_SIZE");
if (sizeOrdinal < 0)
{
sizeOrdinal = reader.GetOrdinal("PRECISION");
}
int size = reader.IsDBNull(sizeOrdinal) ? 0 : reader.GetInt32(sizeOrdinal);
int scaleOrdinal = reader.GetOrdinal("DECIMAL_DIGITS");
if (scaleOrdinal < 0)
{
scaleOrdinal = reader.GetOrdinal("SCALE");
}
short scale = reader.IsDBNull(scaleOrdinal) ? (short)0 : reader.GetInt16(scaleOrdinal);
int nullableOrdinal = reader.GetOrdinal("NULLABLE");
CLI.Nullable nullable = (CLI.Nullable)reader.GetInt16(nullableOrdinal);
bool isNullable = (nullable != CLI.Nullable.SQL_NO_NULLS);
VirtuosoParameter parameter = (VirtuosoParameter)command.CreateParameter();
parameter.ParameterName = name;
parameter.Direction = direction;
parameter.VirtDbType = type.vdbType;
parameter.Size = type.GetFieldSize(size);
parameter.Precision = type.GetPrecision(size);
parameter.Scale = (byte)scale;
parameter.IsNullable = isNullable;
command.Parameters.Add(parameter);
}
}
finally
{
if (reader != null)
{
reader.Close();
}
if (innerCommand != null)
{
innerCommand.Dispose();
}
}
}