refactored the active property of Connection and Transaction.

refactored Transaction.

framework/db/Connection.php

@@ -19,7 +19,7 @@ use yii\db\Exception;
  * of the [[PDO PHP extension]](http://www.php.net/manual/en/ref.pdo.php).
  *
  * To establish a DB connection, set [[dsn]], [[username]] and [[password]], and then
- * call [[open]] or set [[active]] to be true.
+ * call [[open()]] to be true.
  *
  * The following example shows how to create a Connection instance and establish
  * the DB connection:
@@ -30,7 +30,7 @@ use yii\db\Exception;
  *     'username' => $username,
  *     'password' => $password,
  * ));
- * $connection->active = true;  // same as: $connection->open();
+ * $connection->open();
  * ~~~
  *
  * After the DB connection is established, one can execute SQL statements like the following:
@@ -86,7 +86,7 @@ use yii\db\Exception;
  * )
  * ~~~
  *
- * @property boolean $active Whether the DB connection is established.
+ * @property boolean $isActive Whether the DB connection is established. This property is read-only.
  * @property Transaction $currentTransaction The currently active transaction. Null if no active transaction.
  * @property Driver $driver The database driver for the current connection.
  * @property QueryBuilder $queryBuilder The query builder.
@@ -290,22 +290,12 @@ class Connection extends \yii\base\ApplicationComponent
 	 * Returns a value indicating whether the DB connection is established.
 	 * @return boolean whether the DB connection is established
 	 */
-	public function getActive()
+	public function getIsActive()
 	{
 		return $this->pdo !== null;
 	}
 
 	/**
-	 * Opens or closes the DB connection.
-	 * @param boolean $value whether to open or close the DB connection
-	 * @throws Exception if there is any error when establishing the connection
-	 */
-	public function setActive($value)
-	{
-		$value ? $this->open() : $this->close();
-	}
-
-	/**
 	 * Turns on query caching.
 	 * This method is provided as a shortcut to setting two properties that are related
 	 * with query caching: [[queryCacheDuration]] and [[queryCacheDependency]].
@@ -433,7 +423,7 @@ class Connection extends \yii\base\ApplicationComponent
 	 */
 	public function getCurrentTransaction()
 	{
-		if ($this->_transaction !== null && $this->_transaction->active) {
+		if ($this->_transaction !== null && $this->_transaction->isActive) {
 			return $this->_transaction;
 		} else {
 			return null;
@@ -446,10 +436,12 @@ class Connection extends \yii\base\ApplicationComponent
 	 */
 	public function beginTransaction()
 	{
-		\Yii::trace('Starting transaction', __CLASS__);
 		$this->open();
-		$this->pdo->beginTransaction();
+		$this->_transaction = new Transaction(array(
-		return $this->_transaction = new Transaction($this);
+			'connection' => $this,
+		));
+		$this->_transaction->begin();
+		return $this->_transaction;
 	}
 
 	/**

framework/db/Transaction.php

@@ -10,6 +10,7 @@
 namespace yii\db;
 
 use yii\db\Exception;
+use yii\base\BadConfigException;
 
 /**
  * Transaction represents a DB transaction.
@@ -31,32 +32,48 @@ use yii\db\Exception;
  * }
  * ~~~
  *
+ * @property boolean $isActive Whether the transaction is active. This property is read-only.
+ *
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @since 2.0
  */
 class Transaction extends \yii\base\Object
 {
 	/**
+	 * @var Connection the database connection that this transaction is associated with.
+	 */
+	public $connection;
+	/**
 	 * @var boolean whether this transaction is active. Only an active transaction
 	 * can [[commit()]] or [[rollBack()]]. This property is set true when the transaction is started.
 	 */
-	public $active;
+	private $_active = false;
+
 	/**
-	 * @var Connection the database connection that this transaction is associated with.
+	 * Returns a value indicating whether this transaction is active.
+	 * @return boolean whether this transaction is active. Only an active transaction
+	 * can [[commit()]] or [[rollBack()]].
 	 */
-	public $connection;
+	public function getIsActive()
+	{
+		return $this->_active;
+	}
 
 	/**
-	 * Constructor.
+	 * Begins a transaction.
-	 * @param Connection $connection the connection associated with this transaction
+	 * @throws BadConfigException if [[connection]] is null
-	 * @param array $config name-value pairs that will be used to initialize the object properties
-	 * @see Connection::beginTransaction
 	 */
-	public function __construct($connection, $config = array())
+	public function begin()
 	{
-		$this->active = true;
+		if (!$this->_active) {
-		$this->connection = $connection;
+			if ($this->connection === null) {
-		parent::__construct($config);
+				throw new BadConfigException('Transaction::connection must be set.');
+			}
+			\Yii::trace('Starting transaction', __CLASS__);
+			$this->connection->open();
+			$this->connection->pdo->beginTransaction();
+			$this->_active = true;
+		}
 	}
 
 	/**
@@ -65,10 +82,10 @@ class Transaction extends \yii\base\Object
 	 */
 	public function commit()
 	{
-		if ($this->active && $this->connection->getActive()) {
+		if ($this->_active && $this->connection && $this->connection->isActive) {
 			\Yii::trace('Committing transaction', __CLASS__);
 			$this->connection->pdo->commit();
-			$this->active = false;
+			$this->_active = false;
 		} else {
 			throw new Exception('Failed to commit transaction: transaction was inactive.');
 		}
@@ -80,10 +97,10 @@ class Transaction extends \yii\base\Object
 	 */
 	public function rollback()
 	{
-		if ($this->active && $this->connection->getActive()) {
+		if ($this->_active && $this->connection && $this->connection->isActive) {
 			\Yii::trace('Rolling back transaction', __CLASS__);
-			$this->connection->pdo->rollBack();
+			$this->connection->pdo->commit();
-			$this->active = false;
+			$this->_active = false;
 		} else {
 			throw new Exception('Failed to roll back transaction: transaction was inactive.');
 		}

tests/unit/MysqlTestCase.php

@@ -23,7 +23,7 @@ class MysqlTestCase extends TestCase
 		$db->username = $params['username'];
 		$db->password = $params['password'];
 		if ($reset) {
-			$db->active = true;
+			$db->open();
 			$lines = explode(';', file_get_contents($params['fixture']));
 			foreach ($lines as $line) {
 				if (trim($line) !== '') {

tests/unit/framework/db/ConnectionTest.php

@@ -20,15 +20,15 @@ class ConnectionTest extends \yiiunit\MysqlTestCase
 	{
 		$connection = $this->getConnection(false);
 
-		$this->assertFalse($connection->active);
+		$this->assertFalse($connection->isActive);
 		$this->assertEquals(null, $connection->pdo);
 
 		$connection->open();
-		$this->assertTrue($connection->active);
+		$this->assertTrue($connection->isActive);
 		$this->assertTrue($connection->pdo instanceof \PDO);
 
 		$connection->close();
-		$this->assertFalse($connection->active);
+		$this->assertFalse($connection->isActive);
 		$this->assertEquals(null, $connection->pdo);
 
 		$connection = new Connection;
@@ -41,7 +41,7 @@ class ConnectionTest extends \yiiunit\MysqlTestCase
 	{
 		$connection = $this->getConnection(false);
 		$this->assertEquals('mysql', $connection->driverName);
-		$this->assertFalse($connection->active);
+		$this->assertFalse($connection->isActive);
 	}
 
 	function testQuoteValue()