1 files changed, 683 insertions, 683 deletions
diff --git a/framework/Data/TDbConnection.php b/framework/Data/TDbConnection.php
index 0fd17ae1..fb93f076 100644
--- a/framework/Data/TDbConnection.php
+++ b/framework/Data/TDbConnection.php
@@ -1,685 +1,685 @@
-<?php
-/**
- * TDbConnection class file
- *
- * @author Qiang Xue <qiang.xue@gmail.com>
- * @link http://www.pradosoft.com/
- * @copyright Copyright &copy; 2005-2012 PradoSoft
- * @license http://www.pradosoft.com/license/
- * @version $Id$
- * @package System.Data
- */
-
-Prado::using('System.Data.TDbTransaction');
-Prado::using('System.Data.TDbCommand');
-
-/**
- * TDbConnection class
- *
- * TDbConnection represents a connection to a database.
- *
- * TDbConnection works together with {@link TDbCommand}, {@link TDbDataReader}
- * and {@link TDbTransaction} to provide data access to various DBMS
- * in a common set of APIs. They are a thin wrapper of the {@link http://www.php.net/manual/en/ref.pdo.php PDO}
- * PHP extension.
- *
- * To establish a connection, set {@link setActive Active} to true after
- * specifying {@link setConnectionString ConnectionString}, {@link setUsername Username}
- * and {@link setPassword Password}.
- *
- * Since 3.1.2, the connection charset can be set (for MySQL and PostgreSQL databases only)
- * using the {@link setCharset Charset} property. The value of this property is database dependant.
- * e.g. for mysql, you can use 'latin1' for cp1252 West European, 'utf8' for unicode, ...
- *
- * The following example shows how to create a TDbConnection instance and establish
- * the actual connection:
- * <code>
- * $connection=new TDbConnection($dsn,$username,$password);
- * $connection->Active=true;
- * </code>
- *
- * After the DB connection is established, one can execute an SQL statement like the following:
- * <code>
- * $command=$connection->createCommand($sqlStatement);
- * $command->execute();   // a non-query SQL statement execution
- * // or execute an SQL query and fetch the result set
- * $reader=$command->query();
- *
- * // each $row is an array representing a row of data
- * foreach($reader as $row) ...
- * </code>
- *
- * One can do prepared SQL execution and bind parameters to the prepared SQL:
- * <code>
- * $command=$connection->createCommand($sqlStatement);
- * $command->bindParameter($name1,$value1);
- * $command->bindParameter($name2,$value2);
- * $command->execute();
- * </code>
- *
- * To use transaction, do like the following:
- * <code>
- * $transaction=$connection->beginTransaction();
- * try
- * {
- *    $connection->createCommand($sql1)->execute();
- *    $connection->createCommand($sql2)->execute();
- *    //.... other SQL executions
- *    $transaction->commit();
- * }
- * catch(Exception $e)
- * {
- *    $transaction->rollBack();
- * }
- * </code>
- *
- * TDbConnection provides a set of methods to support setting and querying
- * of certain DBMS attributes, such as {@link getNullConversion NullConversion}.
- *
- * @author Qiang Xue <qiang.xue@gmail.com>
- * @version $Id$
- * @package System.Data
- * @since 3.0
- */
-class TDbConnection extends TComponent
-{
-	/**
-	 *
-	 * @since 3.1.7
-	 */
-	const DEFAULT_TRANSACTION_CLASS = 'System.Data.TDbTransaction';
-
-	private $_dsn='';
-	private $_username='';
-	private $_password='';
-	private $_charset='';
-	private $_attributes=array();
-	private $_active=false;
-	private $_pdo=null;
-	private $_transaction;
-
-	/**
-	 * @var TDbMetaData
-	 */
-	private $_dbMeta = null;
-
-	/**
-	 * @var string
-	 * @since 3.1.7
-	 */
-	private $_transactionClass=self::DEFAULT_TRANSACTION_CLASS;
-
-	/**
-	 * Constructor.
-	 * Note, the DB connection is not established when this connection
-	 * instance is created. Set {@link setActive Active} property to true
-	 * to establish the connection.
-	 * Since 3.1.2, you can set the charset for MySql connection
-	 *
-	 * @param string The Data Source Name, or DSN, contains the information required to connect to the database.
-	 * @param string The user name for the DSN string.
-	 * @param string The password for the DSN string.
-	 * @param string Charset used for DB Connection (MySql & pgsql only). If not set, will use the default charset of your database server
-	 * @see http://www.php.net/manual/en/function.PDO-construct.php
-	 */
-	public function __construct($dsn='',$username='',$password='', $charset='')
-	{
-		$this->_dsn=$dsn;
-		$this->_username=$username;
-		$this->_password=$password;
-		$this->_charset=$charset;
-	}
-
-	/**
-	 * Close the connection when serializing.
-	 */
-	public function __sleep()
-	{
-//		$this->close(); - DO NOT CLOSE the current connection as serializing doesn't neccessarily mean we don't this connection anymore in the current session
-		return array_diff(parent::__sleep(),array("\0TDbConnection\0_pdo","\0TDbConnection\0_active")); 
-	}
-
-	/**
-	 * @return array list of available PDO drivers
-	 * @see http://www.php.net/manual/en/function.PDO-getAvailableDrivers.php
-	 */
-	public static function getAvailableDrivers()
-	{
-		return PDO::getAvailableDrivers();
-	}
-
-	/**
-	 * @return boolean whether the DB connection is established
-	 */
-	public function getActive()
-	{
-		return $this->_active;
-	}
-
-	/**
-	 * Open or close the DB connection.
-	 * @param boolean whether to open or close DB connection
-	 * @throws TDbException if connection fails
-	 */
-	public function setActive($value)
-	{
-		$value=TPropertyValue::ensureBoolean($value);
-		if($value!==$this->_active)
-		{
-			if($value)
-				$this->open();
-			else
-				$this->close();
-		}
-	}
-
-	/**
-	 * Opens DB connection if it is currently not
-	 * @throws TDbException if connection fails
-	 */
-	protected function open()
-	{
-		if($this->_pdo===null)
-		{
-			try
-			{
-				$this->_pdo=new PDO($this->getConnectionString(),$this->getUsername(),
+<?php
+/**
+ * TDbConnection class file
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.pradosoft.com/
+ * @copyright Copyright &copy; 2005-2012 PradoSoft
+ * @license http://www.pradosoft.com/license/
+ * @version $Id$
+ * @package System.Data
+ */
+
+Prado::using('System.Data.TDbTransaction');
+Prado::using('System.Data.TDbCommand');
+
+/**
+ * TDbConnection class
+ *
+ * TDbConnection represents a connection to a database.
+ *
+ * TDbConnection works together with {@link TDbCommand}, {@link TDbDataReader}
+ * and {@link TDbTransaction} to provide data access to various DBMS
+ * in a common set of APIs. They are a thin wrapper of the {@link http://www.php.net/manual/en/ref.pdo.php PDO}
+ * PHP extension.
+ *
+ * To establish a connection, set {@link setActive Active} to true after
+ * specifying {@link setConnectionString ConnectionString}, {@link setUsername Username}
+ * and {@link setPassword Password}.
+ *
+ * Since 3.1.2, the connection charset can be set (for MySQL and PostgreSQL databases only)
+ * using the {@link setCharset Charset} property. The value of this property is database dependant.
+ * e.g. for mysql, you can use 'latin1' for cp1252 West European, 'utf8' for unicode, ...
+ *
+ * The following example shows how to create a TDbConnection instance and establish
+ * the actual connection:
+ * <code>
+ * $connection=new TDbConnection($dsn,$username,$password);
+ * $connection->Active=true;
+ * </code>
+ *
+ * After the DB connection is established, one can execute an SQL statement like the following:
+ * <code>
+ * $command=$connection->createCommand($sqlStatement);
+ * $command->execute();   // a non-query SQL statement execution
+ * // or execute an SQL query and fetch the result set
+ * $reader=$command->query();
+ *
+ * // each $row is an array representing a row of data
+ * foreach($reader as $row) ...
+ * </code>
+ *
+ * One can do prepared SQL execution and bind parameters to the prepared SQL:
+ * <code>
+ * $command=$connection->createCommand($sqlStatement);
+ * $command->bindParameter($name1,$value1);
+ * $command->bindParameter($name2,$value2);
+ * $command->execute();
+ * </code>
+ *
+ * To use transaction, do like the following:
+ * <code>
+ * $transaction=$connection->beginTransaction();
+ * try
+ * {
+ *    $connection->createCommand($sql1)->execute();
+ *    $connection->createCommand($sql2)->execute();
+ *    //.... other SQL executions
+ *    $transaction->commit();
+ * }
+ * catch(Exception $e)
+ * {
+ *    $transaction->rollBack();
+ * }
+ * </code>
+ *
+ * TDbConnection provides a set of methods to support setting and querying
+ * of certain DBMS attributes, such as {@link getNullConversion NullConversion}.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id$
+ * @package System.Data
+ * @since 3.0
+ */
+class TDbConnection extends TComponent
+{
+	/**
+	 *
+	 * @since 3.1.7
+	 */
+	const DEFAULT_TRANSACTION_CLASS = 'System.Data.TDbTransaction';
+
+	private $_dsn='';
+	private $_username='';
+	private $_password='';
+	private $_charset='';
+	private $_attributes=array();
+	private $_active=false;
+	private $_pdo=null;
+	private $_transaction;
+
+	/**
+	 * @var TDbMetaData
+	 */
+	private $_dbMeta = null;
+
+	/**
+	 * @var string
+	 * @since 3.1.7
+	 */
+	private $_transactionClass=self::DEFAULT_TRANSACTION_CLASS;
+
+	/**
+	 * Constructor.
+	 * Note, the DB connection is not established when this connection
+	 * instance is created. Set {@link setActive Active} property to true
+	 * to establish the connection.
+	 * Since 3.1.2, you can set the charset for MySql connection
+	 *
+	 * @param string The Data Source Name, or DSN, contains the information required to connect to the database.
+	 * @param string The user name for the DSN string.
+	 * @param string The password for the DSN string.
+	 * @param string Charset used for DB Connection (MySql & pgsql only). If not set, will use the default charset of your database server
+	 * @see http://www.php.net/manual/en/function.PDO-construct.php
+	 */
+	public function __construct($dsn='',$username='',$password='', $charset='')
+	{
+		$this->_dsn=$dsn;
+		$this->_username=$username;
+		$this->_password=$password;
+		$this->_charset=$charset;
+	}
+
+	/**
+	 * Close the connection when serializing.
+	 */
+	public function __sleep()
+	{
+//		$this->close(); - DO NOT CLOSE the current connection as serializing doesn't neccessarily mean we don't this connection anymore in the current session
+		return array_diff(parent::__sleep(),array("\0TDbConnection\0_pdo","\0TDbConnection\0_active")); 
+	}
+
+	/**
+	 * @return array list of available PDO drivers
+	 * @see http://www.php.net/manual/en/function.PDO-getAvailableDrivers.php
+	 */
+	public static function getAvailableDrivers()
+	{
+		return PDO::getAvailableDrivers();
+	}
+
+	/**
+	 * @return boolean whether the DB connection is established
+	 */
+	public function getActive()
+	{
+		return $this->_active;
+	}
+
+	/**
+	 * Open or close the DB connection.
+	 * @param boolean whether to open or close DB connection
+	 * @throws TDbException if connection fails
+	 */
+	public function setActive($value)
+	{
+		$value=TPropertyValue::ensureBoolean($value);
+		if($value!==$this->_active)
+		{
+			if($value)
+				$this->open();
+			else
+				$this->close();
+		}
+	}
+
+	/**
+	 * Opens DB connection if it is currently not
+	 * @throws TDbException if connection fails
+	 */
+	protected function open()
+	{
+		if($this->_pdo===null)
+		{
+			try
+			{
+				$this->_pdo=new PDO($this->getConnectionString(),$this->getUsername(),
 									$this->getPassword(),$this->_attributes);
-				// This attribute is only useful for PDO::MySql driver.
+				// This attribute is only useful for PDO::MySql driver.
 				// Ignore the warning if a driver doesn't understand this.
-				@$this->_pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
-				$this->_pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
-				$this->_active=true;
-				$this->setConnectionCharset();
-			}
-			catch(PDOException $e)
-			{
-				throw new TDbException('dbconnection_open_failed',$e->getMessage());
-			}
-		}
-	}
-
-	/**
-	 * Closes the currently active DB connection.
-	 * It does nothing if the connection is already closed.
-	 */
-	protected function close()
-	{
-		$this->_pdo=null;
-		$this->_active=false;
-	}
-
-	/*
-	 * Set the database connection charset.
-	 * Only MySql databases are supported for now.
-	 * @since 3.1.2
-	 */
-	protected function setConnectionCharset()
-	{
-		if ($this->_charset === '' || $this->_active === false)
-			return;
-		switch ($this->_pdo->getAttribute(PDO::ATTR_DRIVER_NAME))
-		{
-			case 'mysql':
-			case 'sqlite':
-				$stmt = $this->_pdo->prepare('SET NAMES ?');
-			break;
-			case 'pgsql':
-				$stmt = $this->_pdo->prepare('SET client_encoding TO ?');
-			break;
-			default:
-				throw new TDbException('dbconnection_unsupported_driver_charset', $driver);
-		}
-		$stmt->execute(array($this->_charset));
-	}
-
-	/**
-	 * @return string The Data Source Name, or DSN, contains the information required to connect to the database.
-	 */
-	public function getConnectionString()
-	{
-		return $this->_dsn;
-	}
-
-	/**
-	 * @param string The Data Source Name, or DSN, contains the information required to connect to the database.
-	 * @see http://www.php.net/manual/en/function.PDO-construct.php
-	 */
-	public function setConnectionString($value)
-	{
-		$this->_dsn=$value;
-	}
-
-	/**
-	 * @return string the username for establishing DB connection. Defaults to empty string.
-	 */
-	public function getUsername()
-	{
-		return $this->_username;
-	}
-
-	/**
-	 * @param string the username for establishing DB connection
-	 */
-	public function setUsername($value)
-	{
-		$this->_username=$value;
-	}
-
-	/**
-	 * @return string the password for establishing DB connection. Defaults to empty string.
-	 */
-	public function getPassword()
-	{
-		return $this->_password;
-	}
-
-	/**
-	 * @param string the password for establishing DB connection
-	 */
-	public function setPassword($value)
-	{
-		$this->_password=$value;
-	}
-
-	/**
-	 * @return string the charset used for database connection. Defaults to emtpy string.
-	 */
-	public function getCharset ()
-	{
-		return $this->_charset;
-	}
-
-	/**
-	 * @param string the charset used for database connection
-	 */
-	public function setCharset ($value)
-	{
-		$this->_charset=$value;
-		$this->setConnectionCharset();
-	}
-
-	/**
-	 * @return PDO the PDO instance, null if the connection is not established yet
-	 */
-	public function getPdoInstance()
-	{
-		return $this->_pdo;
-	}
-
-	/**
-	 * Creates a command for execution.
-	 * @param string SQL statement associated with the new command.
-	 * @return TDbCommand the DB command
-	 * @throws TDbException if the connection is not active
-	 */
-	public function createCommand($sql)
-	{
-		if($this->getActive())
-			return new TDbCommand($this,$sql);
-		else
-			throw new TDbException('dbconnection_connection_inactive');
-	}
-
-	/**
-	 * @return TDbTransaction the currently active transaction. Null if no active transaction.
-	 */
-	public function getCurrentTransaction()
-	{
-		if($this->_transaction!==null)
-		{
-			if($this->_transaction->getActive())
-				return $this->_transaction;
-		}
-		return null;
-	}
-
-	/**
-	 * Starts a transaction.
-	 * @return TDbTransaction the transaction initiated
-	 * @throws TDbException if the connection is not active
-	 */
-	public function beginTransaction()
-	{
-		if($this->getActive())
-		{
-			$this->_pdo->beginTransaction();
-			return $this->_transaction=Prado::createComponent($this->getTransactionClass(), $this);
-		}
-		else
-			throw new TDbException('dbconnection_connection_inactive');
-	}
-
-	/**
-	 * @return string Transaction class name to be created by calling {@link TDbConnection::beginTransaction}. Defaults to 'System.Data.TDbTransaction'.
-	 * @since 3.1.7
-	 */
-	public function getTransactionClass()
-	{
-		return $this->_transactionClass;
-	}
-
-
-	/**
-	 * @param string Transaction class name to be created by calling {@link TDbConnection::beginTransaction}.
-	 * @since 3.1.7
-	 */
-	public function setTransactionClass($value)
-	{
-		$this->_transactionClass = (string)$value;
-	}
-
-	/**
-	 * Returns the ID of the last inserted row or sequence value.
-	 * @param string name of the sequence object (required by some DBMS)
-	 * @return string the row ID of the last row inserted, or the last value retrieved from the sequence object
-	 * @see http://www.php.net/manual/en/function.PDO-lastInsertId.php
-	 */
-	public function getLastInsertID($sequenceName='')
-	{
-		if($this->getActive())
-			return $this->_pdo->lastInsertId($sequenceName);
-		else
-			throw new TDbException('dbconnection_connection_inactive');
-	}
-
-	/**
-	 * Quotes a string for use in a query.
-	 * @param string string to be quoted
-	 * @return string the properly quoted string
-	 * @see http://www.php.net/manual/en/function.PDO-quote.php
-	 */
-	public function quoteString($str)
-	{
-		if($this->getActive())
-			return $this->_pdo->quote($str);
-		else
-			throw new TDbException('dbconnection_connection_inactive');
-	}
-
-	/**
-	 * Quotes a table name for use in a query.
-	 * @param string $name table name
-	 * @return string the properly quoted table name
-	 */
-	public function quoteTableName($name)
-	{
-		return $this->getDbMetaData()->quoteTableName($name);
-	}
-
-	/**
-	 * Quotes a column name for use in a query.
-	 * @param string $name column name
-	 * @return string the properly quoted column name
-	 */
-	public function quoteColumnName($name)
-	{
-		return $this->getDbMetaData()->quoteColumnName($name);
-	}
-
-	/**
-	 * Quotes a column alias for use in a query.
-	 * @param string $name column name
-	 * @return string the properly quoted column alias
-	 */
-	public function quoteColumnAlias($name)
-	{
-		return $this->getDbMetaData()->quoteColumnAlias($name);
-	}
-
-	/**
-	 * @return TDbMetaData
-	 */
-	public function getDbMetaData()
-	{
-		if($this->_dbMeta===null)
-		{
-			Prado::using('System.Data.Common.TDbMetaData');
-			$this->_dbMeta = TDbMetaData::getInstance($this);
-		}
-		return $this->_dbMeta;
-	}
-
-	/**
-	 * @return TDbColumnCaseMode the case of the column names
-	 */
-	public function getColumnCase()
-	{
-		switch($this->getAttribute(PDO::ATTR_CASE))
-		{
-			case PDO::CASE_NATURAL:
-				return TDbColumnCaseMode::Preserved;
-			case PDO::CASE_LOWER:
-				return TDbColumnCaseMode::LowerCase;
-			case PDO::CASE_UPPER:
-				return TDbColumnCaseMode::UpperCase;
-		}
-	}
-
-	/**
-	 * @param TDbColumnCaseMode the case of the column names
-	 */
-	public function setColumnCase($value)
-	{
-		switch(TPropertyValue::ensureEnum($value,'TDbColumnCaseMode'))
-		{
-			case TDbColumnCaseMode::Preserved:
-				$value=PDO::CASE_NATURAL;
-				break;
-			case TDbColumnCaseMode::LowerCase:
-				$value=PDO::CASE_LOWER;
-				break;
-			case TDbColumnCaseMode::UpperCase:
-				$value=PDO::CASE_UPPER;
-				break;
-		}
-		$this->setAttribute(PDO::ATTR_CASE,$value);
-	}
-
-	/**
-	 * @return TDbNullConversionMode how the null and empty strings are converted
-	 */
-	public function getNullConversion()
-	{
-		switch($this->getAttribute(PDO::ATTR_ORACLE_NULLS))
-		{
-			case PDO::NULL_NATURAL:
-				return TDbNullConversionMode::Preserved;
-			case PDO::NULL_EMPTY_STRING:
-				return TDbNullConversionMode::EmptyStringToNull;
-			case PDO::NULL_TO_STRING:
-				return TDbNullConversionMode::NullToEmptyString;
-		}
-	}
-
-	/**
-	 * @param TDbNullConversionMode how the null and empty strings are converted
-	 */
-	public function setNullConversion($value)
-	{
-		switch(TPropertyValue::ensureEnum($value,'TDbNullConversionMode'))
-		{
-			case TDbNullConversionMode::Preserved:
-				$value=PDO::NULL_NATURAL;
-				break;
-			case TDbNullConversionMode::EmptyStringToNull:
-				$value=PDO::NULL_EMPTY_STRING;
-				break;
-			case TDbNullConversionMode::NullToEmptyString:
-				$value=PDO::NULL_TO_STRING;
-				break;
-		}
-		$this->setAttribute(PDO::ATTR_ORACLE_NULLS,$value);
-	}
-
-	/**
-	 * @return boolean whether creating or updating a DB record will be automatically committed.
-	 * Some DBMS (such as sqlite) may not support this feature.
-	 */
-	public function getAutoCommit()
-	{
-		return $this->getAttribute(PDO::ATTR_AUTOCOMMIT);
-	}
-
-	/**
-	 * @param boolean whether creating or updating a DB record will be automatically committed.
-	 * Some DBMS (such as sqlite) may not support this feature.
-	 */
-	public function setAutoCommit($value)
-	{
-		$this->setAttribute(PDO::ATTR_AUTOCOMMIT,TPropertyValue::ensureBoolean($value));
-	}
-
-	/**
-	 * @return boolean whether the connection is persistent or not
-	 * Some DBMS (such as sqlite) may not support this feature.
-	 */
-	public function getPersistent()
-	{
-		return $this->getAttribute(PDO::ATTR_PERSISTENT);
-	}
-
-	/**
-	 * @param boolean whether the connection is persistent or not
-	 * Some DBMS (such as sqlite) may not support this feature.
-	 */
-	public function setPersistent($value)
-	{
-		return $this->setAttribute(PDO::ATTR_PERSISTENT,TPropertyValue::ensureBoolean($value));
-	}
-
-	/**
-	 * @return string name of the DB driver
-	 */
-	public function getDriverName()
-	{
-		return $this->getAttribute(PDO::ATTR_DRIVER_NAME);
-	}
-
-	/**
-	 * @return string the version information of the DB driver
-	 */
-	public function getClientVersion()
-	{
-		return $this->getAttribute(PDO::ATTR_CLIENT_VERSION);
-	}
-
-	/**
-	 * @return string the status of the connection
-	 * Some DBMS (such as sqlite) may not support this feature.
-	 */
-	public function getConnectionStatus()
-	{
-		return $this->getAttribute(PDO::ATTR_CONNECTION_STATUS);
-	}
-
-	/**
-	 * @return boolean whether the connection performs data prefetching
-	 */
-	public function getPrefetch()
-	{
-		return $this->getAttribute(PDO::ATTR_PREFETCH);
-	}
-
-	/**
-	 * @return string the information of DBMS server
-	 */
-	public function getServerInfo()
-	{
-		return $this->getAttribute(PDO::ATTR_SERVER_INFO);
-	}
-
-	/**
-	 * @return string the version information of DBMS server
-	 */
-	public function getServerVersion()
-	{
-		return $this->getAttribute(PDO::ATTR_SERVER_VERSION);
-	}
-
-	/**
-	 * @return int timeout settings for the connection
-	 */
-	public function getTimeout()
-	{
-		return $this->getAttribute(PDO::ATTR_TIMEOUT);
-	}
-
-	/**
-	 * Obtains a specific DB connection attribute information.
-	 * @param int the attribute to be queried
-	 * @return mixed the corresponding attribute information
-	 * @see http://www.php.net/manual/en/function.PDO-getAttribute.php
-	 */
-	public function getAttribute($name)
-	{
-		if($this->getActive())
-			return $this->_pdo->getAttribute($name);
-		else
-			throw new TDbException('dbconnection_connection_inactive');
-	}
-
-	/**
-	 * Sets an attribute on the database connection.
-	 * @param int the attribute to be set
-	 * @param mixed the attribute value
-	 * @see http://www.php.net/manual/en/function.PDO-setAttribute.php
-	 */
-	public function setAttribute($name,$value)
-	{
-		if($this->_pdo instanceof PDO)
-			$this->_pdo->setAttribute($name,$value);
-		else
-			$this->_attributes[$name]=$value;
-	}
-}
-
-/**
- * TDbColumnCaseMode
- *
- * @author Qiang Xue <qiang.xue@gmail.com>
- * @version $Id$
- * @package System.Data
- * @since 3.0
- */
-class TDbColumnCaseMode extends TEnumerable
-{
-	/**
-	 * Column name cases are kept as is from the database
-	 */
-	const Preserved='Preserved';
-	/**
-	 * Column names are converted to lower case
-	 */
-	const LowerCase='LowerCase';
-	/**
-	 * Column names are converted to upper case
-	 */
-	const UpperCase='UpperCase';
-}
-
-/**
- * TDbNullConversionMode
- *
- * @author Qiang Xue <qiang.xue@gmail.com>
- * @version $Id$
- * @package System.Data
- * @since 3.0
- */
-class TDbNullConversionMode extends TEnumerable
-{
-	/**
-	 * No conversion is performed for null and empty values.
-	 */
-	const Preserved='Preserved';
-	/**
-	 * NULL is converted to empty string
-	 */
-	const NullToEmptyString='NullToEmptyString';
-	/**
-	 * Empty string is converted to NULL
-	 */
-	const EmptyStringToNull='EmptyStringToNull';
-}
-
-?>
+				@$this->_pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
+				$this->_pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
+				$this->_active=true;
+				$this->setConnectionCharset();
+			}
+			catch(PDOException $e)
+			{
+				throw new TDbException('dbconnection_open_failed',$e->getMessage());
+			}
+		}
+	}
+
+	/**
+	 * Closes the currently active DB connection.
+	 * It does nothing if the connection is already closed.
+	 */
+	protected function close()
+	{
+		$this->_pdo=null;
+		$this->_active=false;
+	}
+
+	/*
+	 * Set the database connection charset.
+	 * Only MySql databases are supported for now.
+	 * @since 3.1.2
+	 */
+	protected function setConnectionCharset()
+	{
+		if ($this->_charset === '' || $this->_active === false)
+			return;
+		switch ($this->_pdo->getAttribute(PDO::ATTR_DRIVER_NAME))
+		{
+			case 'mysql':
+			case 'sqlite':
+				$stmt = $this->_pdo->prepare('SET NAMES ?');
+			break;
+			case 'pgsql':
+				$stmt = $this->_pdo->prepare('SET client_encoding TO ?');
+			break;
+			default:
+				throw new TDbException('dbconnection_unsupported_driver_charset', $driver);
+		}
+		$stmt->execute(array($this->_charset));
+	}
+
+	/**
+	 * @return string The Data Source Name, or DSN, contains the information required to connect to the database.
+	 */
+	public function getConnectionString()
+	{
+		return $this->_dsn;
+	}
+
+	/**
+	 * @param string The Data Source Name, or DSN, contains the information required to connect to the database.
+	 * @see http://www.php.net/manual/en/function.PDO-construct.php
+	 */
+	public function setConnectionString($value)
+	{
+		$this->_dsn=$value;
+	}
+
+	/**
+	 * @return string the username for establishing DB connection. Defaults to empty string.
+	 */
+	public function getUsername()
+	{
+		return $this->_username;
+	}
+
+	/**
+	 * @param string the username for establishing DB connection
+	 */
+	public function setUsername($value)
+	{
+		$this->_username=$value;
+	}
+
+	/**
+	 * @return string the password for establishing DB connection. Defaults to empty string.
+	 */
+	public function getPassword()
+	{
+		return $this->_password;
+	}
+
+	/**
+	 * @param string the password for establishing DB connection
+	 */
+	public function setPassword($value)
+	{
+		$this->_password=$value;
+	}
+
+	/**
+	 * @return string the charset used for database connection. Defaults to emtpy string.
+	 */
+	public function getCharset ()
+	{
+		return $this->_charset;
+	}
+
+	/**
+	 * @param string the charset used for database connection
+	 */
+	public function setCharset ($value)
+	{
+		$this->_charset=$value;
+		$this->setConnectionCharset();
+	}
+
+	/**
+	 * @return PDO the PDO instance, null if the connection is not established yet
+	 */
+	public function getPdoInstance()
+	{
+		return $this->_pdo;
+	}
+
+	/**
+	 * Creates a command for execution.
+	 * @param string SQL statement associated with the new command.
+	 * @return TDbCommand the DB command
+	 * @throws TDbException if the connection is not active
+	 */
+	public function createCommand($sql)
+	{
+		if($this->getActive())
+			return new TDbCommand($this,$sql);
+		else
+			throw new TDbException('dbconnection_connection_inactive');
+	}
+
+	/**
+	 * @return TDbTransaction the currently active transaction. Null if no active transaction.
+	 */
+	public function getCurrentTransaction()
+	{
+		if($this->_transaction!==null)
+		{
+			if($this->_transaction->getActive())
+				return $this->_transaction;
+		}
+		return null;
+	}
+
+	/**
+	 * Starts a transaction.
+	 * @return TDbTransaction the transaction initiated
+	 * @throws TDbException if the connection is not active
+	 */
+	public function beginTransaction()
+	{
+		if($this->getActive())
+		{
+			$this->_pdo->beginTransaction();
+			return $this->_transaction=Prado::createComponent($this->getTransactionClass(), $this);
+		}
+		else
+			throw new TDbException('dbconnection_connection_inactive');
+	}
+
+	/**
+	 * @return string Transaction class name to be created by calling {@link TDbConnection::beginTransaction}. Defaults to 'System.Data.TDbTransaction'.
+	 * @since 3.1.7
+	 */
+	public function getTransactionClass()
+	{
+		return $this->_transactionClass;
+	}
+
+
+	/**
+	 * @param string Transaction class name to be created by calling {@link TDbConnection::beginTransaction}.
+	 * @since 3.1.7
+	 */
+	public function setTransactionClass($value)
+	{
+		$this->_transactionClass = (string)$value;
+	}
+
+	/**
+	 * Returns the ID of the last inserted row or sequence value.
+	 * @param string name of the sequence object (required by some DBMS)
+	 * @return string the row ID of the last row inserted, or the last value retrieved from the sequence object
+	 * @see http://www.php.net/manual/en/function.PDO-lastInsertId.php
+	 */
+	public function getLastInsertID($sequenceName='')
+	{
+		if($this->getActive())
+			return $this->_pdo->lastInsertId($sequenceName);
+		else
+			throw new TDbException('dbconnection_connection_inactive');
+	}
+
+	/**
+	 * Quotes a string for use in a query.
+	 * @param string string to be quoted
+	 * @return string the properly quoted string
+	 * @see http://www.php.net/manual/en/function.PDO-quote.php
+	 */
+	public function quoteString($str)
+	{
+		if($this->getActive())
+			return $this->_pdo->quote($str);
+		else
+			throw new TDbException('dbconnection_connection_inactive');
+	}
+
+	/**
+	 * Quotes a table name for use in a query.
+	 * @param string $name table name
+	 * @return string the properly quoted table name
+	 */
+	public function quoteTableName($name)
+	{
+		return $this->getDbMetaData()->quoteTableName($name);
+	}
+
+	/**
+	 * Quotes a column name for use in a query.
+	 * @param string $name column name
+	 * @return string the properly quoted column name
+	 */
+	public function quoteColumnName($name)
+	{
+		return $this->getDbMetaData()->quoteColumnName($name);
+	}
+
+	/**
+	 * Quotes a column alias for use in a query.
+	 * @param string $name column name
+	 * @return string the properly quoted column alias
+	 */
+	public function quoteColumnAlias($name)
+	{
+		return $this->getDbMetaData()->quoteColumnAlias($name);
+	}
+
+	/**
+	 * @return TDbMetaData
+	 */
+	public function getDbMetaData()
+	{
+		if($this->_dbMeta===null)
+		{
+			Prado::using('System.Data.Common.TDbMetaData');
+			$this->_dbMeta = TDbMetaData::getInstance($this);
+		}
+		return $this->_dbMeta;
+	}
+
+	/**
+	 * @return TDbColumnCaseMode the case of the column names
+	 */
+	public function getColumnCase()
+	{
+		switch($this->getAttribute(PDO::ATTR_CASE))
+		{
+			case PDO::CASE_NATURAL:
+				return TDbColumnCaseMode::Preserved;
+			case PDO::CASE_LOWER:
+				return TDbColumnCaseMode::LowerCase;
+			case PDO::CASE_UPPER:
+				return TDbColumnCaseMode::UpperCase;
+		}
+	}
+
+	/**
+	 * @param TDbColumnCaseMode the case of the column names
+	 */
+	public function setColumnCase($value)
+	{
+		switch(TPropertyValue::ensureEnum($value,'TDbColumnCaseMode'))
+		{
+			case TDbColumnCaseMode::Preserved:
+				$value=PDO::CASE_NATURAL;
+				break;
+			case TDbColumnCaseMode::LowerCase:
+				$value=PDO::CASE_LOWER;
+				break;
+			case TDbColumnCaseMode::UpperCase:
+				$value=PDO::CASE_UPPER;
+				break;
+		}
+		$this->setAttribute(PDO::ATTR_CASE,$value);
+	}
+
+	/**
+	 * @return TDbNullConversionMode how the null and empty strings are converted
+	 */
+	public function getNullConversion()
+	{
+		switch($this->getAttribute(PDO::ATTR_ORACLE_NULLS))
+		{
+			case PDO::NULL_NATURAL:
+				return TDbNullConversionMode::Preserved;
+			case PDO::NULL_EMPTY_STRING:
+				return TDbNullConversionMode::EmptyStringToNull;
+			case PDO::NULL_TO_STRING:
+				return TDbNullConversionMode::NullToEmptyString;
+		}
+	}
+
+	/**
+	 * @param TDbNullConversionMode how the null and empty strings are converted
+	 */
+	public function setNullConversion($value)
+	{
+		switch(TPropertyValue::ensureEnum($value,'TDbNullConversionMode'))
+		{
+			case TDbNullConversionMode::Preserved:
+				$value=PDO::NULL_NATURAL;
+				break;
+			case TDbNullConversionMode::EmptyStringToNull:
+				$value=PDO::NULL_EMPTY_STRING;
+				break;
+			case TDbNullConversionMode::NullToEmptyString:
+				$value=PDO::NULL_TO_STRING;
+				break;
+		}
+		$this->setAttribute(PDO::ATTR_ORACLE_NULLS,$value);
+	}
+
+	/**
+	 * @return boolean whether creating or updating a DB record will be automatically committed.
+	 * Some DBMS (such as sqlite) may not support this feature.
+	 */
+	public function getAutoCommit()
+	{
+		return $this->getAttribute(PDO::ATTR_AUTOCOMMIT);
+	}
+
+	/**
+	 * @param boolean whether creating or updating a DB record will be automatically committed.
+	 * Some DBMS (such as sqlite) may not support this feature.
+	 */
+	public function setAutoCommit($value)
+	{
+		$this->setAttribute(PDO::ATTR_AUTOCOMMIT,TPropertyValue::ensureBoolean($value));
+	}
+
+	/**
+	 * @return boolean whether the connection is persistent or not
+	 * Some DBMS (such as sqlite) may not support this feature.
+	 */
+	public function getPersistent()
+	{
+		return $this->getAttribute(PDO::ATTR_PERSISTENT);
+	}
+
+	/**
+	 * @param boolean whether the connection is persistent or not
+	 * Some DBMS (such as sqlite) may not support this feature.
+	 */
+	public function setPersistent($value)
+	{
+		return $this->setAttribute(PDO::ATTR_PERSISTENT,TPropertyValue::ensureBoolean($value));
+	}
+
+	/**
+	 * @return string name of the DB driver
+	 */
+	public function getDriverName()
+	{
+		return $this->getAttribute(PDO::ATTR_DRIVER_NAME);
+	}
+
+	/**
+	 * @return string the version information of the DB driver
+	 */
+	public function getClientVersion()
+	{
+		return $this->getAttribute(PDO::ATTR_CLIENT_VERSION);
+	}
+
+	/**
+	 * @return string the status of the connection
+	 * Some DBMS (such as sqlite) may not support this feature.
+	 */
+	public function getConnectionStatus()
+	{
+		return $this->getAttribute(PDO::ATTR_CONNECTION_STATUS);
+	}
+
+	/**
+	 * @return boolean whether the connection performs data prefetching
+	 */
+	public function getPrefetch()
+	{
+		return $this->getAttribute(PDO::ATTR_PREFETCH);
+	}
+
+	/**
+	 * @return string the information of DBMS server
+	 */
+	public function getServerInfo()
+	{
+		return $this->getAttribute(PDO::ATTR_SERVER_INFO);
+	}
+
+	/**
+	 * @return string the version information of DBMS server
+	 */
+	public function getServerVersion()
+	{
+		return $this->getAttribute(PDO::ATTR_SERVER_VERSION);
+	}
+
+	/**
+	 * @return int timeout settings for the connection
+	 */
+	public function getTimeout()
+	{
+		return $this->getAttribute(PDO::ATTR_TIMEOUT);
+	}
+
+	/**
+	 * Obtains a specific DB connection attribute information.
+	 * @param int the attribute to be queried
+	 * @return mixed the corresponding attribute information
+	 * @see http://www.php.net/manual/en/function.PDO-getAttribute.php
+	 */
+	public function getAttribute($name)
+	{
+		if($this->getActive())
+			return $this->_pdo->getAttribute($name);
+		else
+			throw new TDbException('dbconnection_connection_inactive');
+	}
+
+	/**
+	 * Sets an attribute on the database connection.
+	 * @param int the attribute to be set
+	 * @param mixed the attribute value
+	 * @see http://www.php.net/manual/en/function.PDO-setAttribute.php
+	 */
+	public function setAttribute($name,$value)
+	{
+		if($this->_pdo instanceof PDO)
+			$this->_pdo->setAttribute($name,$value);
+		else
+			$this->_attributes[$name]=$value;
+	}
+}
+
+/**
+ * TDbColumnCaseMode
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id$
+ * @package System.Data
+ * @since 3.0
+ */
+class TDbColumnCaseMode extends TEnumerable
+{
+	/**
+	 * Column name cases are kept as is from the database
+	 */
+	const Preserved='Preserved';
+	/**
+	 * Column names are converted to lower case
+	 */
+	const LowerCase='LowerCase';
+	/**
+	 * Column names are converted to upper case
+	 */
+	const UpperCase='UpperCase';
+}
+
+/**
+ * TDbNullConversionMode
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id$
+ * @package System.Data
+ * @since 3.0
+ */
+class TDbNullConversionMode extends TEnumerable
+{
+	/**
+	 * No conversion is performed for null and empty values.
+	 */
+	const Preserved='Preserved';
+	/**
+	 * NULL is converted to empty string
+	 */
+	const NullToEmptyString='NullToEmptyString';
+	/**
+	 * Empty string is converted to NULL
+	 */
+	const EmptyStringToNull='EmptyStringToNull';
+}
+
+?>