[CODE REVIEW] PDO Prepared Statements

public function update( $tableName, $values, $identifier, $identifierValues )
{
	if ( empty( $tableName ) or !is_array( $values ) or empty( $tableName ) or !is_array( $identifierValues ) )
	{
		die ("PDO Error on update");
	}
	else
	{
		++$this->queryCount;
		$date = time();
		$preparedQuery = "UPDATE `{$tableName}` SET ";
		foreach ( $values as $key => $value )
		{
			$preparedQuery .= "`{$key}` = :{$key}, ";
		}
		$preparedQuery = substr( $preparedQuery, 0, -2 ) . " WHERE `{$identifier}` IN (";
		$count = 0;
		foreach ( $identifierValues as $key )
		{
			++$count;
			$preparedQuery .= ":id{$date}_{$count}, ";
		}
		$preparedQuery = substr( $preparedQuery, 0, -2 ) . " )";
		$query = $this->connection->prepare( $preparedQuery );

		foreach ( $values as $key => $value )
		{
			$query->bindValue( ":{$key}", $value );
		}
		$count = 0;
		foreach (  $identifierValues as $key )
		{
			++$count;
			$query->bindValue( ":id{$date}_{$count}", "{$key}" );
		}
		$query->execute();
	}
}

public function delete ( $tableName, $identifier, $type, $identifierValues )
{
	if ( empty( $tableName ) )
	{
		die ("PDO error on delete");
	}
	else
	{
		$preparedQuery = "DELETE FROM `{$tableName}` WHERE `{$identifier}` ";

		if ( is_array( $identifierValues ) and $type != 'IN' )
		{
			die ("PDO error on delete");
		}
		else
		{

			if ( !is_array( $identifierValues ) )
			{
				$preparedQuery .= "{$type} ?";
				$query = $this->connection->prepare( $preparedQuery );
				$query->bindValue(1, $identifierValues);
				$query->execute();
			}
			else
			{

				$preparedQuery .= $type . " ( ";
				$countIdentifierValues = count( $identifierValues );

				for ( $i = 1 ; $i <= $countIdentifierValues ; $i++ )
				{
					$preparedQuery .= "?, ";
				}

				$preparedQuery = substr( $preparedQuery, 0, -2 ) . " )";
				$count = 0;
				$query = $this->connection->prepare( $preparedQuery );

				foreach ( $identifierValues as $value )
				{
					$count++;
					$query->bindValue( $count, $value );
				}

				$query->execute();
			}
		}
	}
}