moved System.Db to System.Testing.Data and updated classes accordingly

1 files changed, 0 insertions, 759 deletions

diff --git a/framework/Db/TDbConnection.php b/framework/Db/TDbConnection.php
deleted file mode 100755
index d377b552..00000000
--- a/framework/Db/TDbConnection.php
+++ /dev/null
@@ -1,759 +0,0 @@
-<?php
-/**
- * TDbConnection class file
- *
- * @author Qiang Xue <qiang.xue@gmail.com>
- * @author Christophe Boulain <Christophe.Boulain@gmail.com>
- * @link http://www.yiiframework.com/
- * @copyright Copyright &copy; 2008-2009 Yii Software LLC
- * @license http://www.yiiframework.com/license/
- */
-
-prado::using ('System.Db.TDbCommand');
-prado::using ('System.Db.TDbTransaction');
-
-/**
- * TDbConnection represents a connection to a database.
- *
- * This is a port of {@link http://www.yiiframework.com Yii} {@link http://www.yiiframework.com/ CDbConnection}
- *
- * 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 connectionString}, {@link username} and {@link password}.
- *
- * The following example shows how to create a TDbConnection instance and establish
- * the actual connection:
- * <pre>
- * $connection=new TDbConnection($dsn,$username,$password);
- * $connection->active=true;
- * </pre>
- *
- * After the DB connection is established, one can execute an SQL statement like the following:
- * <pre>
- * $command=$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) ...
- * </pre>
- *
- * One can do prepared SQL execution and bind parameters to the prepared SQL:
- * <pre>
- * $command=$connection->createCommand($sqlStatement);
- * $command->bindParam($name1,$value1);
- * $command->bindParam($name2,$value2);
- * $command->execute();
- * </pre>
- *
- * To use transaction, do like the following:
- * <pre>
- * $transaction=$connection->beginTransaction();
- * try
- * {
- *    $connection->createCommand($sql1)->execute();
- *    $connection->createCommand($sql2)->execute();
- *    //.... other SQL executions
- *    $transaction->commit();
- * }
- * catch(Exception $e)
- * {
- *    $transaction->rollBack();
- * }
- * </pre>
- *
- * TDbConnection also 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>
- * @author Christophe.Boulain <Christophe.Boulain@gmail.com>
- * @version $Id$
- * @package System.Db
- * @since 3.2
- */
-class TDbConnection extends TComponent
-{
-	/**
-	 * @var 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 $connectionString;
-	/**
-	 * @var string the username for establishing DB connection. Defaults to empty string.
-	 */
-	public $username='';
-	/**
-	 * @var string the password for establishing DB connection. Defaults to empty string.
-	 */
-	public $password='';
-	/**
-	 * @var integer number of seconds that table metadata can remain valid in cache.
-	 * Use 0 or negative value to indicate not caching schema.
-	 * If greater than 0 and the primary cache is enabled, the table metadata will be cached.
-	 * @see schemaCachingExclude
-	 */
-	public $schemaCachingDuration=0;
-	/**
-	 * @var array list of tables whose metadata should NOT be cached. Defaults to empty array.
-	 * @see schemaCachingDuration
-	 */
-	public $schemaCachingExclude=array();
-	/**
-	 * @var boolean whether the database connection should be automatically established
-	 * the component is being initialized. Defaults to true. Note, this property is only
-	 * effective when the TDbConnection object is used as an application component.
-	 */
-	public $autoConnect=true;
-	/**
-	 * @var string the charset used for database connection. The property is only used
-	 * for MySQL and PostgreSQL databases. Defaults to null, meaning using default charset
-	 * as specified by the database.
-	 */
-	public $charset;
-	/**
-	 * @var boolean whether to turn on prepare emulation. Defaults to false, meaning PDO
-	 * will use the native prepare support if available. For some databases (such as MySQL),
-	 * this may need to be set true so that PDO can emulate the prepare support to bypass
-	 * the buggy native prepare support. Note, this property is only effective for PHP 5.1.3 or above.
-	 */
-	public $emulatePrepare=false;
-	/**
-	 * @var boolean whether to log the values that are bound to a prepare SQL statement.
-	 * Defaults to false. During development, you may consider setting this property to true
-	 * so that parameter values bound to SQL statements are logged for debugging purpose.
-	 * You should be aware that logging parameter values could be expensive and have significant
-	 * impact on the performance of your application.
-	 */
-	public $enableParamLogging=false;
-	/**
-	 * @var boolean whether to enable profiling the SQL statements being executed.
-	 * Defaults to false. This should be mainly enabled and used during development
-	 * to find out the bottleneck of SQL executions.
-	 */
-	public $enableProfiling=false;
-
-	private $_attributes=array();
-	private $_active=false;
-	private $_pdo;
-	private $_transaction;
-	private $_schema;
-
-
-	/**
-	 * Constructor.
-	 * Note, the DB connection is not established when this connection
-	 * instance is created. Set {@link setActive active} property to true
-	 * to establish the connection.
-	 * @param string The Data Source Name, or DSN, contains the information required to connect to the database.
-	 * @param string The user name for the DSN string.
-	 * @param string The password for the DSN string.
-	 * @see http://www.php.net/manual/en/function.PDO-construct.php
-	 */
-	public function __construct($dsn='',$username='',$password='')
-	{
-		$this->connectionString=$dsn;
-		$this->username=$username;
-		$this->password=$password;
-	}
-
-	/**
-	 * Close the connection when serializing.
-	 */
-	public function __sleep()
-	{
-		$this->close();
-		return array_keys(get_object_vars($this));
-	}
-
-	/**
-	 * @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();
-	}
-
-	/**
-	 * Initializes the component.
-	 * This method is required by {@link IApplicationComponent} and is invoked by application
-	 * when the TDbConnection is used as an application component.
-	 * If you override this method, make sure to call the parent implementation
-	 * so that the component can be marked as initialized.
-	 */
-	public function init()
-	{
-		if($this->autoConnect)
-			$this->setActive(true);
-	}
-
-	/**
-	 * @return boolean whether the DB connection is established
-	 */
-	public function getActive()
-	{
-		return $this->_active;
-	}
-
-	/**
-	 * Open or close the DB connection.
-	 * @param boolean whether to open or close DB connection
-	 * @throws CException if connection fails
-	 */
-	public function setActive($value)
-	{
-		if($value!=$this->_active)
-		{
-			if($value)
-				$this->open();
-			else
-				$this->close();
-		}
-	}
-
-	/**
-	 * Opens DB connection if it is currently not
-	 * @throws CException if connection fails
-	 */
-	protected function open()
-	{
-		if($this->_pdo===null)
-		{
-			if(empty($this->connectionString))
-				throw new TDbException('TDbConnection.connectionString cannot be empty.');
-			try
-			{
-				Prado::trace('Opening DB connection','system.Db.TDbConnection');
-				$this->_pdo=$this->createPdoInstance();
-				$this->initConnection($this->_pdo);
-				$this->_active=true;
-			}
-			catch(PDOException $e)
-			{
-				throw new TDbException('TDbConnection failed to open the DB connection: {0}',$e->getMessage());
-			}
-		}
-	}
-
-	/**
-	 * Closes the currently active DB connection.
-	 * It does nothing if the connection is already closed.
-	 */
-	protected function close()
-	{
-		Prado::trace('Closing DB connection','system.Db.TDbConnection');
-		$this->_pdo=null;
-		$this->_active=false;
-		$this->_schema=null;
-	}
-
-	/**
-	 * Creates the PDO instance.
-	 * When some functionalities are missing in the pdo driver, we may use
-	 * an adapter class to provides them.
-	 * @return PDO the pdo instance
-	 * @since 1.0.4
-	 */
-	protected function createPdoInstance()
-	{
-		$pdoClass='PDO';
-		if(($pos=strpos($this->connectionString,':'))!==false)
-		{
-			$driver=strtolower(substr($this->connectionString,0,$pos));
-			if($driver==='mssql' || $driver==='dblib')
-			{
-				prado::using('System.Db.Schema.mssql.TMssqlPdoAdapter');
-				$pdoClass='TMssqlPdoAdapter';
-			}
-		}
-		return new $pdoClass($this->connectionString,$this->username,
-									$this->password,$this->_attributes);
-	}
-
-	/**
-	 * Initializes the open db connection.
-	 * This method is invoked right after the db connection is established.
-	 * The default implementation is to set the charset for MySQL and PostgreSQL database connections.
-	 * @param PDO the PDO instance
-	 */
-	protected function initConnection($pdo)
-	{
-		$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
-		if($this->emulatePrepare && constant('PDO::ATTR_EMULATE_PREPARES'))
-			$pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES,true);
-		if($this->charset!==null)
-		{
-			switch ($pdo->getAttribute(PDO::ATTR_DRIVER_NAME))
-			{
-				case 'mysql':
-					$stmt = $pdo->prepare('SET CHARACTER SET ?');
-				break;
-				case 'pgsql':
-					$stmt = $pdo->prepare('SET client_encoding TO ?');
-				break;
-				case 'sqlite':
-					$stmt = $pdo->prepare ('SET NAMES ?');
-				break;
-			}
-			$stmt->execute(array($this->charset));
-		}
-	}
-
-	/**
-	 * @return PDO the PDO instance, null if the connection is not established yet
-	 */
-	public function getPdoInstance()
-	{
-		return $this->_pdo;
-	}
-
-	/**
-	 * Creates a command for execution.
-	 * @param string SQL statement associated with the new command.
-	 * @return TDbCommand the DB command
-	 * @throws CException if the connection is not active
-	 */
-	public function createCommand($sql)
-	{
-		if($this->getActive())
-			return new TDbCommand($this,$sql);
-		else
-			throw new TDbException('TDbConnection is inactive and cannot perform any DB operations.');
-	}
-
-	/**
-	 * @return TDbTransaction the currently active transaction. Null if no active transaction.
-	 */
-	public function getCurrentTransaction()
-	{
-		if($this->_transaction!==null)
-		{
-			if($this->_transaction->getActive())
-				return $this->_transaction;
-		}
-		return null;
-	}
-
-	/**
-	 * Starts a transaction.
-	 * @return TDbTransaction the transaction initiated
-	 * @throws CException if the connection is not active
-	 */
-	public function beginTransaction()
-	{
-		if($this->getActive())
-		{
-			$this->_pdo->beginTransaction();
-			return $this->_transaction=new TDbTransaction($this);
-		}
-		else
-			throw new TDbException('TDbConnection is inactive and cannot perform any DB operations.');
-	}
-
-	/**
-	 * @return TDbSchema the database schema for the current connection
-	 * @throws CException if the connection is not active yet
-	 */
-	public function getSchema()
-	{
-		if($this->_schema!==null)
-			return $this->_schema;
-		else
-		{
-			if(!$this->getActive())
-				throw new TDbException('TDbConnection is inactive and cannot perform any DB operations.');
-			$driver=$this->getDriverName();
-			switch(strtolower($driver))
-			{
-				case 'pgsql':  // PostgreSQL
-					prado::using('System.Db.Schema.pgsql.TPgsqlSchema');
-					return $this->_schema=new TPgsqlSchema($this);
-				case 'mysqli': // MySQL
-				case 'mysql':
-					prado::using('System.Db.Schema.mysql.TMysqlSchema');
-					return $this->_schema=new TMysqlSchema($this);
-				case 'sqlite': // sqlite 3
-				case 'sqlite2': // sqlite 2
-					prado::using('System.Db.Schema.sqlite.TSqliteSchema');
-					return $this->_schema=new TSqliteSchema($this);
-				case 'mssql': // Mssql driver on windows hosts
-				case 'dblib': // dblib drivers on linux (and maybe others os) hosts
-					prado::using('System.Db.Schema.mssql.TMssqlSchema');
-					return $this->_schema=new TMssqlSchema($this);
-				case 'oci':  // Oracle driver
-					prado::using('System.Db.Schema.oci.TOciSchema');
-					return $this->_schema=new TOciSchema($this);
-				case 'ibm':
-				default:
-					throw new TDbException('TDbConnection does not support reading schema for {0} database.',
-						$driver);
-			}
-		}
-	}
-
-	/**
-	 * Returns the SQL command builder for the current DB connection.
-	 * @return TDbCommandBuilder the command builder
-	 */
-	public function getCommandBuilder()
-	{
-		return $this->getSchema()->getCommandBuilder();
-	}
-
-	/**
-	 * Returns the ID of the last inserted row or sequence value.
-	 * @param string name of the sequence object (required by some DBMS)
-	 * @return string the row ID of the last row inserted, or the last value retrieved from the sequence object
-	 * @see http://www.php.net/manual/en/function.PDO-lastInsertId.php
-	 */
-	public function getLastInsertID($sequenceName='')
-	{
-		if($this->getActive())
-			return $this->_pdo->lastInsertId($sequenceName);
-		else
-			throw new TDbException('TDbConnection is inactive and cannot perform any DB operations.');
-	}
-
-	/**
-	 * Quotes a string value 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('TDbConnection is inactive and cannot perform any DB operations.');
-	}
-
-	/**
-	 * Quotes a table name for use in a query.
-	 * @param string table name
-	 * @return string the properly quoted table name
-	 */
-	public function quoteTableName($name)
-	{
-		return $this->getSchema()->quoteTableName($name);
-	}
-
-	/**
-	 * Quotes a column name for use in a query.
-	 * @param string column name
-	 * @return string the properly quoted column name
-	 */
-	public function quoteColumnName($name)
-	{
-		return $this->getSchema()->quoteColumnName($name);
-	}
-
-	/**
-	 * Determines the PDO type for the specified PHP type.
-	 * @param string The PHP type (obtained by gettype() call).
-	 * @return integer the corresponding PDO type
-	 */
-	public function getPdoType($type)
-	{
-		static $map=array
-		(
-			'boolean'=>PDO::PARAM_BOOL,
-			'integer'=>PDO::PARAM_INT,
-			'string'=>PDO::PARAM_STR,
-			'NULL'=>PDO::PARAM_NULL,
-		);
-		return isset($map[$type]) ? $map[$type] : PDO::PARAM_STR;
-	}
-
-	/**
-	 * @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)
-	{
-		$this->setAttribute(PDO::ATTR_AUTOCOMMIT,$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 $this->setAttribute(PDO::ATTR_PERSISTENT,$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('TDbConnection is inactive and cannot perform any DB operations.');
-	}
-
-	/**
-	 * 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]=$value;
-	}
-
-	/**
-	 * Returns the statistical results of SQL executions.
-	 * The results returned include the number of SQL statements executed and
-	 * the total time spent.
-	 * In order to use this method, {@link enableProfiling} has to be set true.
-	 * @return array the first element indicates the number of SQL statements executed,
-	 * and the second element the total time spent in SQL execution.
-	 * @since 1.0.6
-	 */
-	public function getStats()
-	{
-		/*$logger=Yii::getLogger();
-		$timings=$logger->getProfilingResults(null,'system.Db.TDbCommand.query');
-		$count=count($timings);
-		$time=array_sum($timings);
-		$timings=$logger->getProfilingResults(null,'system.Db.TDbCommand.execute');
-		$count+=count($timings);
-		$time+=array_sum($timings);
-		return array($count,$time);*/
-	}
-
-	/**
-	 * Getters & Setters to provide BC with prado-3.1
-	 */
-	public function getConnectionString() { return $this->connectionString;	}
-	public function getUsername () { return $this->username; }
-	public function getPassword () { return $this->password; }
-	public function getCharset () { return $this->charset; }
-	public function getSchemaCachingDuration() { return $this->schemaCachingDuration; }
-	public function getSchemaCachingExclude () { return $this->schemaCachingExclude; }
-	public function getAutoConnect () { return $this->autoConnect; }
-	public function getEmulatePrepare () { return $this->emulatePrepare; }
-	public function getEnableParamLogging () { return $this->enableParamLogging; }
-	public function getEnableProfiling () { return $this->enableProfiling; }
-
-	public function setConnectionString($value) { $this->connectionString=TPropertyValue::ensureString($value);	}
-	public function setUsername ($value) { $this->username=TPropertyValue::ensureString($value); }
-	public function setPassword ($value) { $this->password=TPropertyValue::ensureString($value); }
-	public function setCharset ($value) { $this->charset=TPropertyValue::ensureString($value); }
-	public function setSchemaCachingDuration ($value) { $this->schemaCachingDuration=TPropertyValue::ensureInteger($value); }
-	public function setSchemaCachingExclude ($value) { $this->username=TPropertyValue::ensureArray($value); }
-	public function setAutoConnect ($value) { $this->autoConnect = TPropertyValue::ensureBoolean($value); }
-	public function setEnablePrepare ($value) { $this->emulatePrepare = TPropertyValue::ensureBoolean($value); }
-	public function setEnableParamLogging ($value) { $this->enableParamLogging = TPropertyValue::ensureBoolean($value); }
-	public function setEnableProfiling ($value) { $this->enableProfiling = TPropertyValue::ensureBoolean ($value) ; }
-}
-
-
-/**
- * TDbColumnCaseMode
- *
- * @author Qiang Xue <qiang.xue@gmail.com>
- * @version $Id$
- * @package System.Db
- * @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.Db
- * @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';
-}