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

1 files changed, 759 insertions, 0 deletions

diff --git a/framework/Testing/Data/TDbConnection.php b/framework/Testing/Data/TDbConnection.php
new file mode 100755
index 00000000..92708907
--- /dev/null
+++ b/framework/Testing/Data/TDbConnection.php
@@ -0,0 +1,759 @@
+<?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.Testing.Data.TDbCommand');
+prado::using ('System.Testing.Data.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.Testing.Data
+ * @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.Testing.Data.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.Testing.Data.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.Testing.Data.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.Testing.Data.Schema.pgsql.TPgsqlSchema');
+					return $this->_schema=new TPgsqlSchema($this);
+				case 'mysqli': // MySQL
+				case 'mysql':
+					prado::using('System.Testing.Data.Schema.mysql.TMysqlSchema');
+					return $this->_schema=new TMysqlSchema($this);
+				case 'sqlite': // sqlite 3
+				case 'sqlite2': // sqlite 2
+					prado::using('System.Testing.Data.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.Testing.Data.Schema.mssql.TMssqlSchema');
+					return $this->_schema=new TMssqlSchema($this);
+				case 'oci':  // Oracle driver
+					prado::using('System.Testing.Data.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.Testing.Data.TDbCommand.query');
+		$count=count($timings);
+		$time=array_sum($timings);
+		$timings=$logger->getProfilingResults(null,'System.Testing.Data.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.Testing.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.Testing.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';
+}