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<?php
/**
* Database access module.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @version $Revision: $ $Date: $
* @package System.DataAccess
* @since 3.0
*/
abstract class TDatabaseProvider extends TModule
{
private $_connectionString = '';
private $_database='';
private $_driver='';
private $_host='';
private $_username='';
private $_password='';
private $_persistent=true;
/**
* @param string used to open the connection
*/
public function setConnectionString($value)
{
$this->_connectionString = $value;
}
/**
* @return string used to open the connection
*/
public function getConnectionString()
{
return $this->_connectionString;
}
/**
* @return string the DB driver (mysql, sqlite, etc.)
*/
public function getDriver()
{
return $this->_driver;
}
/**
* Sets the DB driver (mysql, sqlite, etc.)
* @param string the DB driver
*/
public function setDriver($value)
{
$this->_driver=$value;
}
/**
* @return string the DB host name/IP (and port number) in the format "host[:port]"
*/
public function getHost()
{
return $this->_host;
}
/**
* Sets the DB host name/IP (and port number) in the format "host[:port]"
* @param string the DB host
*/
public function setHost($value)
{
$this->_host=$value;
}
/**
* @return string the DB username
*/
public function getUsername()
{
return $this->_username;
}
/**
* Sets the DB username
* @param string the DB username
*/
public function setUsername($value)
{
$this->_username=$value;
}
/**
* @return string the DB password
*/
public function getPassword()
{
return $this->_password;
}
/**
* Sets the DB password
* @param string the DB password
*/
public function setPassword($value)
{
$this->_password=$value;
}
/**
* @return string the database name
*/
public function getDatabase()
{
return $this->_database;
}
/**
* Sets the database name
* @param string the database name
*/
public function setDatabase($value)
{
$this->_database=$value;
}
/**
* @return boolean whether the DB connection is persistent
*/
public function getUsePersistentConnection()
{
return $this->_persistent;
}
/**
* Sets whether the DB connection should be persistent
* @param boolean whether the DB connection should be persistent
*/
public function setUsePersistentConnection($value)
{
$this->_persistent=$value;
}
/**
* @return TDbConnection a database connection
*/
public abstract function getConnection();
}
/**
* A connection (session) with a specific database. SQL statements are executed
* and results are returned within the context of a connection.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @version $Revision: $ $Date: $
* @package System.DataAccess
* @since 3.0
*/
interface IDbConnection
{
/**
* Closes the connection to the database.
*/
public function close();
/**
* @return boolean retrieves whether this connection has been closed.
*/
public function getIsClosed();
/**
* Opens a database connection with settings provided in the ConnectionString.
*/
public function open();
/**
* @return string creates a prepared statement for sending parameterized
* SQL statements to the database.
*/
public function prepare($statement);
/**
* Executes the SQL statement which may be any kind of SQL statement,
* including prepared statements.
* @param string sql query statement
* @param array subsititution parameters
* @return mixed result set
*/
public function execute($sql, $parameters=array());
/**
* Start a transaction on this connection.
*/
public function beginTransaction();
/**
* Finish and cleanup transactions.
*/
public function completeTransaction();
/**
* Fail the current transaction.
*/
public function failTransaction();
/**
* @return boolean true if transaction has failed.
*/
public function getHasTransactionFailed();
/**
* Makes all changes made since the previous commit/rollback permanent and
* releases any database locks.
*/
public function commit();
/**
* Undoes all changes made in the current transaction and releases any
* database locks
*/
public function rollback();
/**
* @param string quote a string to be sent to the database.
* @param boolean if true it ensure that the variable is not quoted twice,
* once by quote and once by the magic_quotes_gpc.
* @return string database specified quoted string
*/
public function quote($string, $magic_quotes=false);
}
/**
* Performs the connection to the database using a TDatabaseProvider,
* executes SQL statements.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @version $Revision: $ $Date: $
* @package System.DataAccess
* @since 3.0
*/
abstract class TDbConnection extends TComponent implements IDbConnection
{
private $_provider;
public function __construct($provider)
{
if($provider instanceof TDatabaseProvider)
$this->setProvider($provider);
}
public function setProvider($provider)
{
$this->_provider = $provider;
}
public function getProvider()
{
return $this->_provider;
}
}
?>
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