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tags/2.0.0-beta
Qiang Xue 14 years ago
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  1. 645
      framework/db/dao/Connection.php

645
framework/db/dao/Connection.php
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@ -11,74 +11,72 @@
namespace yii\db\dao; namespace yii\db\dao;
/** /**
* Connection represents a connection to a database. * Connection represents a connection to a database via [PDO](http://www.php.net/manual/en/ref.pdo.php).
* *
* Connection works together with {@link CDbCommand}, {@link CDbDataReader} * Connection works together with [[Command]], [[DataReader]] and [[Transaction]]
* and {@link CDbTransaction} to provide data access to various DBMS * to provide data access to various DBMS in a common set of APIs. They are a thin wrapper
* in a common set of APIs. They are a thin wrapper of the {@link http://www.php.net/manual/en/ref.pdo.php PDO} * of the [[PDO PHP extension]](http://www.php.net/manual/en/ref.pdo.php).
* PHP extension.
* *
* To establish a connection, set {@link setActive active} to true after * To establish a DB connection, set [[dsn]], [[username]] and [[password]], and then
* specifying {@link connectionString}, {@link username} and {@link password}. * call [[open]] or set [[active]] to be true.
* *
* The following example shows how to create a Connection instance and establish * The following example shows how to create a Connection instance and establish
* the actual connection: * the DB connection:
* <pre>
* $connection=new Connection($dsn,$username,$password);
* $connection->active=true;
* </pre>
* *
* After the DB connection is established, one can execute an SQL statement like the following: * ~~~
* <pre> * $connection = \yii\db\dao\Connection::create($dsn, $username, $password);
* $command=$connection->createCommand($sqlStatement); * $connection->open(); // same as: $connection->active = true;
* ~~~
*
* After the DB connection is established, one can execute a SQL statement like the following:
*
* ~~~
* $command = $connection->createCommand('SELECT * FROM tbl_post');
* $command->execute(); // a non-query SQL statement execution * $command->execute(); // a non-query SQL statement execution
* // or execute an SQL query and fetch the result set * // or execute an SQL query and return the results as an array
* $reader=$command->query(); * $rows = $command->queryAll();
* ~~~
*
* One can also do prepared SQL execution and bind parameters to the prepared SQL:
* *
* // each $row is an array representing a row of data * ~~~
* foreach($reader as $row) ... * $command = $connection->createCommand('SELECT * FROM tbl_post WHERE id=:id');
* </pre> * $command->bindValue(':id', $_GET['id']);
* $post = $command->query();
* ~~~
* *
* One can do prepared SQL execution and bind parameters to the prepared SQL: * DB transaction may also be used for DBMS that supports it. For example,
* <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(); * $transaction = $connection->beginTransaction();
* try * try {
* {
* $connection->createCommand($sql1)->execute(); * $connection->createCommand($sql1)->execute();
* $connection->createCommand($sql2)->execute(); * $connection->createCommand($sql2)->execute();
* //.... other SQL executions * // ... executing other SQL statements ...
* $transaction->commit(); * $transaction->commit();
* } * }
* catch(Exception $e) * catch(Exception $e) {
* {
* $transaction->rollBack(); * $transaction->rollBack();
* } * }
* </pre> * ~~~
* *
* Connection also provides a set of methods to support setting and querying * Since Connection extends from [[\yii\base\ApplicationComponent]], it can
* of certain DBMS attributes, such as {@link getNullConversion nullConversion}.
*
* Since Connection implements the interface IApplicationComponent, it can
* be used as an application component and be configured in application configuration, * be used as an application component and be configured in application configuration,
* like the following, * like the following,
* <pre> *
* ~~~
* array( * array(
* 'components' => array( * 'components' => array(
* 'db' => array( * 'db' => array(
* 'class'=>'Connection', * 'class' => '\yii\db\dao\Connection',
* 'connectionString'=>'sqlite:path/to/dbfile', * 'dsn' => 'mysql:host=127.0.0.1;dbname=demo',
* 'username' => 'root',
* 'password' => '',
* 'charset' => 'utf8',
* ), * ),
* ), * ),
* ) * )
* </pre> * ~~~
* *
* @author Qiang Xue <qiang.xue@gmail.com> * @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0 * @since 2.0
@ -86,8 +84,9 @@ namespace yii\db\dao;
class Connection extends \yii\base\ApplicationComponent class Connection extends \yii\base\ApplicationComponent
{ {
/** /**
* @var string The Data Source Name, or DSN, contains the information required to connect to the database. * @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 * Please refer to the [PHP manual](http://www.php.net/manual/en/function.PDO-construct.php) on
* the format of the DSN string.
* *
* Note that if your database is using GBK or BIG5 charset, we highly recommend you * Note that if your database is using GBK or BIG5 charset, we highly recommend you
* to upgrade to PHP 5.3.6+ and specify charset via DSN like the following to prevent * to upgrade to PHP 5.3.6+ and specify charset via DSN like the following to prevent
@ -103,12 +102,30 @@ class Connection extends \yii\base\ApplicationComponent
*/ */
public $password = ''; public $password = '';
/** /**
* @var array PDO attributes (name=>value) that should be set when calling [[open]]
* to establish a DB connection. Please refer to the
* [PHP manual](http://www.php.net/manual/en/function.PDO-setAttribute.php) for
* details about available attributes.
*/
public $attributes;
/**
* @var \PDO the PHP PDO instance associated with this DB connection.
* This property is mainly managed by [[open]] and [[close]] methods.
* When a DB connection is active, this property will represent a PDO instance;
* otherwise, it will be null.
*/
public $pdo;
/**
* @var integer number of seconds that table metadata can remain valid in cache. * @var integer number of seconds that table metadata can remain valid in cache.
* Use 0 or negative value to indicate not caching schema. * Defaults to -1, meaning schema caching is disabled.
* If greater than 0 and the primary cache is enabled, the table metadata will be cached. * Use 0 to indicate that the cached data will never expire.
*
* Note that in order to enable schema caching, a valid cache component as specified
* by [[schemaCacheID]] must be enabled.
* @see schemaCachingExclude * @see schemaCachingExclude
* @see schemaCacheID
*/ */
public $schemaCachingDuration = 0; public $schemaCachingDuration = -1;
/** /**
* @var array list of tables whose metadata should NOT be cached. Defaults to empty array. * @var array list of tables whose metadata should NOT be cached. Defaults to empty array.
* @see schemaCachingDuration * @see schemaCachingDuration
@ -116,55 +133,47 @@ class Connection extends \yii\base\ApplicationComponent
public $schemaCachingExclude = array(); public $schemaCachingExclude = array();
/** /**
* @var string the ID of the cache application component that is used to cache the table metadata. * @var string the ID of the cache application component that is used to cache the table metadata.
* Defaults to 'cache' which refers to the primary cache application component. * Defaults to 'cache'.
* Set this property to false if you want to disable caching table metadata. * @see schemaCachingDuration
* @since 1.0.10
*/ */
public $schemaCacheID = 'cache'; public $schemaCacheID = 'cache';
/** /**
* @var integer number of seconds that query results can remain valid in cache. * @var integer number of seconds that query results can remain valid in cache.
* Use 0 or negative value to indicate not caching query results (the default behavior). * Defaults to -1, meaning query caching is disabled.
* Use 0 to indicate that the cached data will never expire.
* *
* In order to enable query caching, this property must be a positive * Note that in order to enable query caching, a valid cache component as specified
* integer and {@link queryCacheID} must point to a valid cache component ID. * by [[queryCacheID]] must be enabled.
* *
* The method {@link cache()} is provided as a convenient way of setting this property * The method [[cache()]] is provided as a convenient way of setting this property
* and {@link queryCachingDependency} on the fly. * and [[queryCachingDependency]] on the fly.
* *
* @see cache * @see cache
* @see queryCachingDependency * @see queryCachingDependency
* @see queryCacheID * @see queryCacheID
* @since 1.1.7
*/ */
public $queryCachingDuration = 0; public $queryCachingDuration = -1;
/** /**
* @var CCacheDependency the dependency that will be used when saving query results into cache. * @var CCacheDependency the dependency that will be used when saving query results into cache.
* Defaults to null, meaning no dependency.
* @see queryCachingDuration * @see queryCachingDuration
* @since 1.1.7
*/ */
public $queryCachingDependency; public $queryCachingDependency;
/** /**
* @var integer the number of SQL statements that need to be cached next. * @var integer the number of SQL statements that need to be cached when they are executed next.
* If this is 0, then even if query caching is enabled, no query will be cached. * Defaults to 0, meaning the query result of the next SQL statement will NOT be cached.
* Note that each time after executing a SQL statement (whether executed on DB server or fetched from * Note that each time after executing a SQL statement (whether executed on DB server or fetched from
* query cache), this property will be reduced by 1 until 0. * query cache), this property will be reduced by 1 until 0.
* @since 1.1.7 * @see queryCachingDuration
*/ */
public $queryCachingCount = 0; public $queryCachingCount = 0;
/** /**
* @var string the ID of the cache application component that is used for query caching. * @var string the ID of the cache application component that is used for query caching.
* Defaults to 'cache' which refers to the primary cache application component. * Defaults to 'cache'.
* Set this property to false if you want to disable query caching. * @see queryCachingDuration
* @since 1.1.7
*/ */
public $queryCacheID = 'cache'; public $queryCacheID = 'cache';
/** /**
* @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 Connection object is used as an application component.
*/
public $autoConnect = true;
/**
* @var string the charset used for database connection. The property is only used * @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 * for MySQL and PostgreSQL databases. Defaults to null, meaning using default charset
* as specified by the database. * as specified by the database.
@ -188,77 +197,69 @@ class Connection extends \yii\base\ApplicationComponent
* so that parameter values bound to SQL statements are logged for debugging purpose. * 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 * You should be aware that logging parameter values could be expensive and have significant
* impact on the performance of your application. * impact on the performance of your application.
* @since 1.0.5
*/ */
public $enableParamLogging = false; public $enableParamLogging = false;
/** /**
* @var boolean whether to enable profiling the SQL statements being executed. * @var boolean whether to enable profiling for the SQL statements being executed.
* Defaults to false. This should be mainly enabled and used during development * Defaults to false. This should be mainly enabled and used during development
* to find out the bottleneck of SQL executions. * to find out the bottleneck of SQL executions.
* @since 1.0.6 * @see getStats
*/ */
public $enableProfiling = false; public $enableProfiling = false;
/** /**
* @var string the default prefix for table names. Defaults to null, meaning no table prefix. * @var string the default prefix for table names. Defaults to null, meaning no table prefix.
* By setting this property, any token like '{{tableName}}' in {@link CDbCommand::text} will * By setting this property, any token like '{{tableName}}' in [[Command::text]] will
* be replaced by 'prefixTableName', where 'prefix' refers to this property value. * be replaced with 'prefixTableName', where 'prefix' refers to this property value.
* @since 1.1.0 * For example, '{{post}}' becomes 'tbl_post', if 'tbl_' is set as the table prefix.
*/ */
public $tablePrefix; public $tablePrefix;
/** /**
* @var array list of SQL statements that should be executed right after the DB connection is established. * @var array list of SQL statements that should be executed right after the DB connection is established.
* @since 1.1.1
*/ */
public $initSQLs; public $initSQLs;
/** /**
* @var array mapping between PDO driver and schema class name. * @var array mapping between PDO drivers and schema classes.
* A schema class can be specified using path alias. * The keys of the array are PDO driver names while the values the corresponding
* @since 1.1.6 * schema class name or configuration. Please refer to [[\Yii::createComponent]] for
*/ * details on how to specify a configuration.
public $driverMap = array( *
'pgsql' => 'CPgsqlSchema', // PostgreSQL * This property is mainly used by [[getSchema]] when fetching the database schema information.
'mysqli' => 'CMysqlSchema', // MySQL */
'mysql' => 'CMysqlSchema', // MySQL public $schemaMap = array(
'sqlite' => 'CSqliteSchema', // sqlite 3 'pgsql' => '\yii\db\dao\pgsql\Schema', // PostgreSQL
'sqlite2' => 'CSqliteSchema', // sqlite 2 'mysqli' => '\yii\db\dao\mysql\Schema', // MySQL
'mssql' => 'CMssqlSchema', // Mssql driver on windows hosts 'mysql' => '\yii\db\dao\mysql\Schema', // MySQL
'dblib' => 'CMssqlSchema', // dblib drivers on linux (and maybe others os) hosts 'sqlite' => '\yii\db\dao\sqlite\Schema', // sqlite 3
'sqlsrv' => 'CMssqlSchema', // Mssql 'sqlite2' => '\yii\db\dao\\sqlite\Schema', // sqlite 2
'oci' => 'COciSchema', // Oracle driver 'mssql' => '\yii\db\dao\mssql\Schema', // Mssql driver on windows hosts
'dblib' => '\yii\db\dao\mssql\Schema', // dblib drivers on linux (and maybe others os) hosts
'sqlsrv' => '\yii\db\dao\mssql\Schema', // Mssql
'oci' => '\yii\db\dao\oci\Schema', // Oracle driver
); );
/**
* @var string Custom PDO wrapper class.
* @since 1.1.8
*/
public $pdoClass = 'PDO';
private $_attributes = array();
private $_active = false;
private $_pdo;
private $_transaction; private $_transaction;
private $_schema; private $_schema;
/** /**
* Constructor. * Constructor.
* Note, the DB connection is not established when this connection * Note, the DB connection is not established when this connection
* instance is created. Set {@link setActive active} property to true * instance is created. You may set [[active]] to be true or call [[open]]
* to establish the connection. * to establish the connection.
* @param string $dsn The Data Source Name, or DSN, contains the information required to connect to the database. * @param string $dsn the Data Source Name, or DSN, contains the information
* @param string $username The user name for the DSN string. * required to connect to the database.
* @param string $password The password for the DSN string. * @param string $username the user name for the DSN string.
* @param string $password the password for the DSN string.
* @see http://www.php.net/manual/en/function.PDO-construct.php * @see http://www.php.net/manual/en/function.PDO-construct.php
*/ */
public function __construct($dsn = '', $username = '', $password = '') public function __construct($dsn = '', $username = '', $password = '')
{ {
$this->connectionString = $dsn; $this->dsn = $dsn;
$this->username = $username; $this->username = $username;
$this->password = $password; $this->password = $password;
} }
/** /**
* Close the connection when serializing. * Closes the connection when this component is being serialized.
* @return array * @return array
*/ */
public function __sleep() public function __sleep()
@ -278,61 +279,38 @@ class Connection extends \yii\base\ApplicationComponent
} }
/** /**
* Initializes the component. * Returns a value indicating whether the DB connection is established.
* This method is required by {@link IApplicationComponent} and is invoked by application
* when the Connection is used as an application component.
* If you override this method, make sure to call the parent implementation
* so that the component can be marked as initialized.
*/
public function init()
{
parent::init();
if ($this->autoConnect)
$this->setActive(true);
}
/**
* Returns whether the DB connection is established.
* @return boolean whether the DB connection is established * @return boolean whether the DB connection is established
*/ */
public function getActive() public function getActive()
{ {
return $this->_active; return $this->pdo !== null;
} }
/** /**
* Open or close the DB connection. * Opens or closes the DB connection.
* @param boolean $value whether to open or close DB connection * @param boolean $value whether to open or close the DB connection
* @throws CException if connection fails * @throws Exception if there is any error when establishing the connection
*/ */
public function setActive($value) public function setActive($value)
{ {
if ($value != $this->_active) $value ? $this->open() : $this->close();
{
if ($value)
$this->open();
else
$this->close();
}
} }
/** /**
* Sets the parameters about query caching. * Sets the parameters about query caching.
* This method can be used to enable or disable query caching. * This method is provided as a shortcut to setting three properties that are related
* By setting the $duration parameter to be 0, the query caching will be disabled. * with query caching: [[queryCachingDuration]], [[queryCachingDependency]] and
* Otherwise, query results of the new SQL statements executed next will be saved in cache * [[queryCachingCount]].
* and remain valid for the specified duration.
* If the same query is executed again, the result may be fetched from cache directly
* without actually executing the SQL statement.
* @param integer $duration the number of seconds that query results may remain valid in cache. * @param integer $duration the number of seconds that query results may remain valid in cache.
* If this is 0, the caching will be disabled. * See [[queryCachingDuration]] for more details.
* @param CCacheDependency $dependency the dependency that will be used when saving the query results into cache. * @param CCacheDependency $dependency the dependency for the cached query result.
* @param integer $queryCount number of SQL queries that need to be cached after calling this method. Defaults to 1, * See [[queryCachingDependency]] for more details.
* meaning that the next SQL query will be cached. * @param integer $queryCount number of SQL queries that need to be cached after calling this method.
* See [[queryCachingCount]] for more details.
* @return Connection the connection instance itself. * @return Connection the connection instance itself.
* @since 1.1.7
*/ */
public function cache($duration, $dependency = null, $queryCount = 1) public function cache($duration = 300, $dependency = null, $queryCount = 1)
{ {
$this->queryCachingDuration = $duration; $this->queryCachingDuration = $duration;
$this->queryCachingDependency = $dependency; $this->queryCachingDependency = $dependency;
@ -341,33 +319,28 @@ class Connection extends \yii\base\ApplicationComponent
} }
/** /**
* Opens DB connection if it is currently not * Establishes a DB connection.
* @throws CException if connection fails * It does nothing if a DB connection has already been established.
* @throws Exception if connection fails
*/ */
protected function open() public function open()
{
if ($this->_pdo === null)
{
if (empty($this->connectionString))
throw new CDbException(Yii::t('yii', 'Connection.connectionString cannot be empty.'));
try
{ {
Yii::trace('Opening DB connection', 'system.db.Connection'); if ($this->pdo === null) {
$this->_pdo = $this->createPdoInstance(); if (empty($this->dsn)) {
$this->initConnection($this->_pdo); throw new Exception('Connection.dsn cannot be empty.');
$this->_active = true;
} }
catch(PDOException $e) try {
{ \Yii::trace('Opening DB connection', __CLASS__);
if (YII_DEBUG) $this->pdo = $this->createPdoInstance();
{ $this->initConnection($this->pdo);
throw new CDbException(Yii::t('yii', 'Connection failed to open the DB connection: {error}',
array('{error}' => $e->getMessage())), (int)$e->getCode(), $e->errorInfo);
} }
else catch (\PDOException $e) {
{ if (YII_DEBUG) {
Yii::log($e->getMessage(), CLogger::LEVEL_ERROR, 'exception.CDbException'); throw new Exception('Failed to open DB connection: ' . $e->getMessage(), (int)$e->getCode(), $e->errorInfo);
throw new CDbException(Yii::t('yii', 'Connection failed to open the DB connection.'), (int)$e->getCode(), $e->errorInfo); }
else {
\Yii::error($e->getMessage(), __CLASS__);
throw new Exception('Failed to open DB connection.', (int)$e->getCode(), $e->errorInfo);
} }
} }
} }
@ -377,93 +350,82 @@ class Connection extends \yii\base\ApplicationComponent
* Closes the currently active DB connection. * Closes the currently active DB connection.
* It does nothing if the connection is already closed. * It does nothing if the connection is already closed.
*/ */
protected function close() public function close()
{ {
Yii::trace('Closing DB connection', 'system.db.Connection'); if ($this->pdo !== null) {
$this->_pdo = null; \Yii::trace('Closing DB connection', __CLASS__);
$this->_active = false; $this->pdo = null;
$this->_schema = null; $this->_schema = null;
} }
}
/** /**
* Creates the PDO instance. * Creates the PDO instance.
* When some functionalities are missing in the pdo driver, we may use * This method is called by [[open]] to establish a DB connection.
* an adapter class to provides them. * The default implementation will create a PHP `PDO` instance.
* @return PDO the pdo instance * You may override this method if the default `PDO` needs to be adapted for certain DBMS.
* @since 1.0.4 * @return \PDO the pdo instance
*/ */
protected function createPdoInstance() protected function createPdoInstance()
{ {
$pdoClass = $this->pdoClass; $pdoClass = '\PDO';
if (($pos = strpos($this->connectionString, ':')) !== false) if (($pos = strpos($this->dsn, ':')) !== false) {
{ $driver = strtolower(substr($this->dsn, 0, $pos));
$driver = strtolower(substr($this->connectionString, 0, $pos)); if ($driver === 'mssql' || $driver === 'dblib' || $driver === 'sqlsrv') {
if ($driver === 'mssql' || $driver === 'dblib' || $driver === 'sqlsrv') $pdoClass = '\yii\db\dao\mssql\PDO';
$pdoClass = 'CMssqlPdoAdapter';
} }
return new $pdoClass($this->connectionString, $this->username, }
$this->password, $this->_attributes); return new $pdoClass($this->dsn, $this->username, $this->password, $this->attributes);
} }
/** /**
* Initializes the open db connection. * Initializes the DB connection.
* This method is invoked right after the db connection is established. * 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. * The default implementation sets the [[charset]] and executes SQLs specified
* @param PDO $pdo the PDO instance * in [[initSQLs]].
*/ */
protected function initConnection($pdo) protected function initConnection()
{
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
if ($this->emulatePrepare !== null && constant('PDO::ATTR_EMULATE_PREPARES'))
$pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, $this->emulatePrepare);
if ($this->charset !== null)
{ {
$driver = strtolower($pdo->getAttribute(PDO::ATTR_DRIVER_NAME)); $this->pdo->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);
if (in_array($driver, array('pgsql', 'mysql', 'mysqli'))) if ($this->emulatePrepare !== null && constant('\PDO::ATTR_EMULATE_PREPARES')) {
$pdo->exec('SET NAMES ' . $pdo->quote($this->charset)); $this->pdo->setAttribute(\PDO::ATTR_EMULATE_PREPARES, $this->emulatePrepare);
} }
if ($this->initSQLs !== null) if ($this->charset !== null) {
{ $driver = strtolower($this->pdo->getAttribute(\PDO::ATTR_DRIVER_NAME));
foreach ($this->initSQLs as $sql) if (in_array($driver, array('pgsql', 'mysql', 'mysqli'))) {
$pdo->exec($sql); $this->pdo->exec('SET NAMES ' . $this->pdo->quote($this->charset));
}
}
if (!empty($this->initSQLs)) {
foreach ($this->initSQLs as $sql) {
$this->pdo->exec($sql);
} }
} }
/**
* Returns the PDO instance.
* @return PDO the PDO instance, null if the connection is not established yet
*/
public function getPdoInstance()
{
return $this->_pdo;
} }
/** /**
* Creates a command for execution. * Creates a command for execution.
* @param mixed $query the DB query to be executed. This can be either a string representing a SQL statement, * @param mixed $query the DB query to be executed. This can be either a string representing a SQL statement,
* or an array representing different fragments of a SQL statement. Please refer to {@link CDbCommand::__construct} * or an array representing different fragments of a SQL statement. Please refer to [[Command::__construct]]
* for more details about how to pass an array as the query. If this parameter is not given, * for more details about how to pass an array as the query. If this parameter is not given,
* you will have to call query builder methods of {@link CDbCommand} to build the DB query. * you will have to call query builder methods in [[Command]] to build the DB query.
* @return CDbCommand the DB command * @return Command the DB command
*/ */
public function createCommand($query = null) public function createCommand($query = null)
{ {
$this->setActive(true); $this->open();
return new CDbCommand($this, $query); return new Command($this, $query);
} }
/** /**
* Returns the currently active transaction. * Returns the currently active transaction.
* @return CDbTransaction the currently active transaction. Null if no active transaction. * @return Transaction the currently active transaction. Null if no active transaction.
*/ */
public function getCurrentTransaction() public function getCurrentTransaction()
{ {
if ($this->_transaction !== null) if ($this->_transaction !== null && $this->_transaction->getActive()) {
{
if ($this->_transaction->getActive())
return $this->_transaction; return $this->_transaction;
} }
return null;
} }
/** /**
@ -472,10 +434,10 @@ class Connection extends \yii\base\ApplicationComponent
*/ */
public function beginTransaction() public function beginTransaction()
{ {
Yii::trace('Starting transaction', 'system.db.Connection'); \Yii::trace('Starting transaction', __CLASS__);
$this->setActive(true); $this->open();
$this->_pdo->beginTransaction(); $this->pdo->beginTransaction();
return $this->_transaction = new CDbTransaction($this); return $this->_transaction = new Transaction($this);
} }
/** /**
@ -484,13 +446,13 @@ class Connection extends \yii\base\ApplicationComponent
*/ */
public function getSchema() public function getSchema()
{ {
if ($this->_schema !== null) if ($this->_schema !== null) {
return $this->_schema; return $this->_schema;
else }
{ else {
$driver = $this->getDriverName(); $driver = $this->getDriverName();
if (isset($this->driverMap[$driver])) if (isset($this->schemaMap[$driver]))
return $this->_schema = Yii::createComponent($this->driverMap[$driver], $this); return $this->_schema = Yii::createComponent($this->schemaMap[$driver], $this);
else else
throw new CDbException(Yii::t('yii', 'Connection does not support reading schema for {driver} database.', throw new CDbException(Yii::t('yii', 'Connection does not support reading schema for {driver} database.',
array('{driver}' => $driver))); array('{driver}' => $driver)));
@ -498,16 +460,6 @@ class Connection extends \yii\base\ApplicationComponent
} }
/** /**
* Returns the SQL command builder for the current DB connection.
* @return CDbCommandBuilder the command builder
* @since 1.0.4
*/
public function getCommandBuilder()
{
return $this->getSchema()->getCommandBuilder();
}
/**
* Returns the ID of the last inserted row or sequence value. * Returns the ID of the last inserted row or sequence value.
* @param string $sequenceName name of the sequence object (required by some DBMS) * @param string $sequenceName name of the sequence object (required by some DBMS)
* @return string the row ID of the last row inserted, or the last value retrieved from the sequence object * @return string the row ID of the last row inserted, or the last value retrieved from the sequence object
@ -515,8 +467,8 @@ class Connection extends \yii\base\ApplicationComponent
*/ */
public function getLastInsertID($sequenceName = '') public function getLastInsertID($sequenceName = '')
{ {
$this->setActive(true); $this->open();
return $this->_pdo->lastInsertId($sequenceName); return $this->pdo->lastInsertId($sequenceName);
} }
/** /**
@ -527,15 +479,18 @@ class Connection extends \yii\base\ApplicationComponent
*/ */
public function quoteValue($str) public function quoteValue($str)
{ {
if (is_int($str) || is_float($str)) if (is_int($str) || is_float($str) || is_bool($str)) {
return $str; return $str;
}
$this->setActive(true); $this->open();
if (($value = $this->_pdo->quote($str)) !== false) if (($value = $this->pdo->quote($str)) !== false) {
return $value; return $value;
else // the driver doesn't support quote (e.g. oci) }
else { // the driver doesn't support quote (e.g. oci)
return "'" . addcslashes(str_replace("'", "''", $str), "\000\n\r\\\032") . "'"; return "'" . addcslashes(str_replace("'", "''", $str), "\000\n\r\\\032") . "'";
} }
}
/** /**
* Quotes a table name for use in a query. * Quotes a table name for use in a query.
@ -560,166 +515,34 @@ class Connection extends \yii\base\ApplicationComponent
} }
/** /**
* Determines the PDO type for the specified PHP type. * Determines the PDO type for the give PHP data type.
* @param string $type The PHP type (obtained by gettype() call). * @param string $type The PHP type (obtained by `gettype()` call).
* @return integer the corresponding PDO type * @return integer the corresponding PDO type
* @see http://www.php.net/manual/en/pdo.constants.php
*/ */
public function getPdoType($type) public function getPdoType($type)
{ {
static $map = array static $map = array(
( 'boolean' => \PDO::PARAM_BOOL,
'boolean' => PDO::PARAM_BOOL, 'integer' => \PDO::PARAM_INT,
'integer' => PDO::PARAM_INT, 'string' => \PDO::PARAM_STR,
'string' => PDO::PARAM_STR, 'NULL' => \PDO::PARAM_NULL,
'NULL' => PDO::PARAM_NULL,
); );
return isset($map[$type]) ? $map[$type] : PDO::PARAM_STR; return isset($map[$type]) ? $map[$type] : PDO::PARAM_STR;
} }
/** /**
* Returns the case of the column names * Returns the name of the DB driver for the current [[dsn]].
* @return mixed the case of the column names
* @see http://www.php.net/manual/en/pdo.setattribute.php
*/
public function getColumnCase()
{
return $this->getAttribute(PDO::ATTR_CASE);
}
/**
* Sets the case of the column names.
* @param mixed $value the case of the column names
* @see http://www.php.net/manual/en/pdo.setattribute.php
*/
public function setColumnCase($value)
{
$this->setAttribute(PDO::ATTR_CASE, $value);
}
/**
* Returns how the null and empty strings are converted.
* @return mixed how the null and empty strings are converted
* @see http://www.php.net/manual/en/pdo.setattribute.php
*/
public function getNullConversion()
{
return $this->getAttribute(PDO::ATTR_ORACLE_NULLS);
}
/**
* Sets how the null and empty strings are converted.
* @param mixed $value how the null and empty strings are converted
* @see http://www.php.net/manual/en/pdo.setattribute.php
*/
public function setNullConversion($value)
{
$this->setAttribute(PDO::ATTR_ORACLE_NULLS, $value);
}
/**
* Returns whether creating or updating a DB record will be automatically committed.
* Some DBMS (such as sqlite) may not support this feature.
* @return boolean whether creating or updating a DB record will be automatically committed.
*/
public function getAutoCommit()
{
return $this->getAttribute(PDO::ATTR_AUTOCOMMIT);
}
/**
* Sets whether creating or updating a DB record will be automatically committed.
* Some DBMS (such as sqlite) may not support this feature.
* @param boolean $value whether creating or updating a DB record will be automatically committed.
*/
public function setAutoCommit($value)
{
$this->setAttribute(PDO::ATTR_AUTOCOMMIT, $value);
}
/**
* Returns whether the connection is persistent or not.
* Some DBMS (such as sqlite) may not support this feature.
* @return boolean whether the connection is persistent or not
*/
public function getPersistent()
{
return $this->getAttribute(PDO::ATTR_PERSISTENT);
}
/**
* Sets whether the connection is persistent or not.
* Some DBMS (such as sqlite) may not support this feature.
* @param boolean $value whether the connection is persistent or not
*/
public function setPersistent($value)
{
return $this->setAttribute(PDO::ATTR_PERSISTENT, $value);
}
/**
* Returns the name of the DB driver
* @return string name of the DB driver * @return string name of the DB driver
*/ */
public function getDriverName() public function getDriverName()
{ {
if (($pos = strpos($this->connectionString, ':')) !== false) if (($pos = strpos($this->dsn, ':')) !== false) {
return strtolower(substr($this->connectionString, 0, $pos)); return strtolower(substr($this->dsn, 0, $pos));
// return $this->getAttribute(PDO::ATTR_DRIVER_NAME);
} }
else {
/** return $this->getAttribute(\PDO::ATTR_DRIVER_NAME);
* Returns the version information of the DB driver.
* @return string the version information of the DB driver
*/
public function getClientVersion()
{
return $this->getAttribute(PDO::ATTR_CLIENT_VERSION);
} }
/**
* Returns the status of the connection.
* Some DBMS (such as sqlite) may not support this feature.
* @return string the status of the connection
*/
public function getConnectionStatus()
{
return $this->getAttribute(PDO::ATTR_CONNECTION_STATUS);
}
/**
* Returns whether the connection performs data prefetching.
* @return boolean whether the connection performs data prefetching
*/
public function getPrefetch()
{
return $this->getAttribute(PDO::ATTR_PREFETCH);
}
/**
* Returns the information of DBMS server.
* @return string the information of DBMS server
*/
public function getServerInfo()
{
return $this->getAttribute(PDO::ATTR_SERVER_INFO);
}
/**
* Returns the version information of DBMS server.
* @return string the version information of DBMS server
*/
public function getServerVersion()
{
return $this->getAttribute(PDO::ATTR_SERVER_VERSION);
}
/**
* Returns the timeout settings for the connection.
* @return integer timeout settings for the connection
*/
public function getTimeout()
{
return $this->getAttribute(PDO::ATTR_TIMEOUT);
} }
/** /**
@ -730,8 +553,8 @@ class Connection extends \yii\base\ApplicationComponent
*/ */
public function getAttribute($name) public function getAttribute($name)
{ {
$this->setActive(true); $this->open();
return $this->_pdo->getAttribute($name); return $this->pdo->getAttribute($name);
} }
/** /**
@ -742,51 +565,25 @@ class Connection extends \yii\base\ApplicationComponent
*/ */
public function setAttribute($name, $value) public function setAttribute($name, $value)
{ {
if ($this->_pdo instanceof PDO) $this->open();
$this->_pdo->setAttribute($name, $value); $this->pdo->setAttribute($name, $value);
else
$this->_attributes[$name] = $value;
}
/**
* Returns the attributes that are previously explicitly set for the DB connection.
* @return array attributes (name=>value) that are previously explicitly set for the DB connection.
* @see setAttributes
* @since 1.1.7
*/
public function getAttributes()
{
return $this->_attributes;
}
/**
* Sets a set of attributes on the database connection.
* @param array $values attributes (name=>value) to be set.
* @see setAttribute
* @since 1.1.7
*/
public function setAttributes($values)
{
foreach ($values as $name => $value)
$this->_attributes[$name] = $value;
} }
/** /**
* Returns the statistical results of SQL executions. * Returns the statistical results of SQL executions.
* The results returned include the number of SQL statements executed and * The results returned include the number of SQL statements executed and
* the total time spent. * the total time spent.
* In order to use this method, {@link enableProfiling} has to be set true. * In order to use this method, [[enableProfiling]] has to be set true.
* @return array the first element indicates the number of SQL statements executed, * @return array the first element indicates the number of SQL statements executed,
* and the second element the total time spent in SQL execution. * and the second element the total time spent in SQL execution.
* @since 1.0.6
*/ */
public function getStats() public function getStats()
{ {
$logger = Yii::getLogger(); $logger = \Yii::getLogger();
$timings = $logger->getProfilingResults(null, 'system.db.CDbCommand.query'); $timings = $logger->getProfilingResults(null, 'yii\db\dao\Command::query');
$count = count($timings); $count = count($timings);
$time = array_sum($timings); $time = array_sum($timings);
$timings = $logger->getProfilingResults(null, 'system.db.CDbCommand.execute'); $timings = $logger->getProfilingResults(null, 'yii\db\dao\Command::execute');
$count += count($timings); $count += count($timings);
$time += array_sum($timings); $time += array_sum($timings);
return array($count, $time); return array($count, $time);

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