defines the interface for a Propel database adapter.
*
* Support for new databases is added by subclassing
* DBAdapter and implementing its abstract interface, and by
* registering the new database adapter and corresponding Propel
* driver in the private adapters map (array) in this class.
*
* The Propel database adapters exist to present a uniform
* interface to database access across all available databases. Once
* the necessary adapters have been written and configured,
* transparent swapping of databases is theoretically supported with
* zero code change and minimal configuration file
* modifications.
*
* @author Hans Lellelid (Propel)
* @author Jon S. Stevens (Torque)
* @author Brett McLaughlin (Torque)
* @author Daniel Rall (Torque)
* @version $Revision: 1612 $
* @package propel.runtime.adapter
*/
abstract class DBAdapter
{
const ID_METHOD_NONE = 0;
const ID_METHOD_AUTOINCREMENT = 1;
const ID_METHOD_SEQUENCE = 2;
/**
* Propel driver to Propel adapter map.
* @var array
*/
private static $adapters = array(
'mysql' => 'DBMySQL',
'mysqli' => 'DBMySQLi',
'mssql' => 'DBMSSQL',
'dblib' => 'DBMSSQL',
'sybase' => 'DBSybase',
'oracle' => 'DBOracle',
'oci' => 'DBOracle',
'pgsql' => 'DBPostgres',
'sqlite' => 'DBSQLite',
'' => 'DBNone',
);
/**
* Creates a new instance of the database adapter associated
* with the specified Propel driver.
*
* @param string $driver The name of the Propel driver to
* create a new adapter instance for or a shorter form adapter key.
* @return DBAdapter An instance of a Propel database adapter.
* @throws PropelException if the adapter could not be instantiated.
*/
public static function factory($driver) {
$adapterClass = isset(self::$adapters[$driver]) ? self::$adapters[$driver] : null;
if ($adapterClass !== null) {
$a = new $adapterClass();
return $a;
} else {
throw new PropelException("Unsupported Propel driver: " . $driver . ": Check your configuration file");
}
}
/**
* This method is called after a connection was created to run necessary
* post-initialization queries or code.
*
* If a charset was specified, this will be set before any other queries
* are executed.
*
* This base method runs queries specified using the "query" setting.
*
* @param PDO A PDO connection instance.
* @param array An array of settings.
* @see setCharset()
*/
public function initConnection(PDO $con, array $settings)
{
if (isset($settings['charset']['value'])) {
$this->setCharset($con, $settings['charset']['value']);
}
if (isset($settings['queries']) && is_array($settings['queries'])) {
foreach ($settings['queries'] as $queries) {
foreach ((array)$queries as $query) {
$con->exec($query);
}
}
}
}
/**
* Sets the character encoding using SQL standard SET NAMES statement.
*
* This method is invoked from the default initConnection() method and must
* be overridden for an RDMBS which does _not_ support this SQL standard.
*
* @param PDO A PDO connection instance.
* @param string The charset encoding.
* @see initConnection()
*/
public function setCharset(PDO $con, $charset)
{
$con->exec("SET NAMES '" . $charset . "'");
}
/**
* This method is used to ignore case.
*
* @param string The string to transform to upper case.
* @return string The upper case string.
*/
public abstract function toUpperCase($in);
/**
* Returns the character used to indicate the beginning and end of
* a piece of text used in a SQL statement (generally a single
* quote).
*
* @return string The text delimeter.
*/
public function getStringDelimiter()
{
return '\'';
}
/**
* This method is used to ignore case.
*
* @param string $in The string whose case to ignore.
* @return string The string in a case that can be ignored.
*/
public abstract function ignoreCase($in);
/**
* This method is used to ignore case in an ORDER BY clause.
* Usually it is the same as ignoreCase, but some databases
* (Interbase for example) does not use the same SQL in ORDER BY
* and other clauses.
*
* @param string $in The string whose case to ignore.
* @return string The string in a case that can be ignored.
*/
public function ignoreCaseInOrderBy($in)
{
return $this->ignoreCase($in);
}
/**
* Returns SQL which concatenates the second string to the first.
*
* @param string String to concatenate.
* @param string String to append.
* @return string
*/
public abstract function concatString($s1, $s2);
/**
* Returns SQL which extracts a substring.
*
* @param string String to extract from.
* @param int Offset to start from.
* @param int Number of characters to extract.
* @return string
*/
public abstract function subString($s, $pos, $len);
/**
* Returns SQL which calculates the length (in chars) of a string.
*
* @param string String to calculate length of.
* @return string
*/
public abstract function strLength($s);
/**
* Quotes database objec identifiers (table names, col names, sequences, etc.).
* @param string $text The identifier to quote.
* @return string The quoted identifier.
*/
public function quoteIdentifier($text)
{
return '"' . $text . '"';
}
/**
* Quotes a database table which could have space seperating it from an alias, both should be identified seperately
* @param string $table The table name to quo
* @return string The quoted table name
**/
public function quoteIdentifierTable($table) {
return implode(" ", array_map(array($this, "quoteIdentifier"), explode(" ", $table) ) );
}
/**
* Returns the native ID method for this RDBMS.
* @return int one of DBAdapter:ID_METHOD_SEQUENCE, DBAdapter::ID_METHOD_AUTOINCREMENT.
*/
protected function getIdMethod()
{
return DBAdapter::ID_METHOD_AUTOINCREMENT;
}
/**
* Whether this adapter uses an ID generation system that requires getting ID _before_ performing INSERT.
* @return boolean
*/
public function isGetIdBeforeInsert()
{
return ($this->getIdMethod() === DBAdapter::ID_METHOD_SEQUENCE);
}
/**
* Whether this adapter uses an ID generation system that requires getting ID _before_ performing INSERT.
* @return boolean
*/
public function isGetIdAfterInsert()
{
return ($this->getIdMethod() === DBAdapter::ID_METHOD_AUTOINCREMENT);
}
/**
* Gets the generated ID (either last ID for autoincrement or next sequence ID).
* @return mixed
*/
public function getId(PDO $con, $name = null)
{
return $con->lastInsertId($name);
}
/**
* Returns timestamp formatter string for use in date() function.
* @return string
*/
public function getTimestampFormatter()
{
return "Y-m-d H:i:s";
}
/**
* Returns date formatter string for use in date() function.
* @return string
*/
public function getDateFormatter()
{
return "Y-m-d";
}
/**
* Returns time formatter string for use in date() function.
* @return string
*/
public function getTimeFormatter()
{
return "H:i:s";
}
/**
* Should Column-Names get identifiers for inserts or updates.
* By default false is returned -> backwards compability.
*
* it`s a workaround...!!!
*
* @todo should be abstract
* @return boolean
* @deprecated
*/
public function useQuoteIdentifier()
{
return false;
}
/**
* Modifies the passed-in SQL to add LIMIT and/or OFFSET.
*/
public abstract function applyLimit(&$sql, $offset, $limit);
/**
* Gets the SQL string that this adapter uses for getting a random number.
*
* @param mixed $seed (optional) seed value for databases that support this
*/
public abstract function random($seed = null);
}