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<?php
/**
* Command class file.
*
* @link http://www.yiiframework.com/
* @copyright Copyright &copy; 2008-2012 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\db\dao;
use yii\db\Exception;
/**
* Command represents a SQL statement to be executed against a database.
*
* A command object is usually created by calling [[Connection::createCommand()]].
* The SQL statement it represents can be set via the [[sql]] property.
*
* To execute a non-query SQL (such as INSERT, DELETE, UPDATE), call [[execute()]].
* To execute a SQL statement that returns result data set (such as SELECT),
* use [[queryAll()]], [[queryRow()]], [[queryColumn()]], [[queryScalar()]], or [[query()]].
* For example,
*
* ~~~
* $users = \Yii::$application->db->createCommand('SELECT * FROM tbl_user')->queryAll();
* ~~~
*
* Command supports SQL statement preparation and parameter binding.
* Call [[bindValue()]] to bind a value to a SQL parameter;
* Call [[bindParam()]] to bind a PHP variable to a SQL parameter.
* When binding a parameter, the SQL statement is automatically prepared.
* You may also call [[prepare()]] explicitly to prepare a SQL statement.
*
* @property string $sql the SQL statement to be executed
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class Command extends \yii\base\Component
{
/**
* @var Connection the DB connection that this command is associated with
*/
public $connection;
/**
* @var \PDOStatement the PDOStatement object that this command contains
*/
public $pdoStatement;
/**
* @var mixed the default fetch mode for this command.
* @see http://www.php.net/manual/en/function.PDOStatement-setFetchMode.php
*/
public $fetchMode = \PDO::FETCH_ASSOC;
/**
* @var string the SQL statement that this command represents
*/
private $_sql;
/**
* @var array the parameter log information (name=>value)
*/
private $_params = array();
/**
* Constructor.
* @param Connection $connection the database connection
* @param string $sql the SQL statement to be executed
* @param array $params the parameters to be bound to the SQL statement
* @param array $config name-value pairs that will be used to initialize the object properties
*/
public function __construct($connection, $sql = null, $params = array(), $config = array())
{
$this->connection = $connection;
$this->_sql = $sql;
$this->bindValues($params);
parent::__construct($config);
}
/**
* Returns the SQL statement for this command.
* @return string the SQL statement to be executed
*/
public function getSql()
{
return $this->_sql;
}
/**
* Specifies the SQL statement to be executed.
* Any previous execution will be terminated or cancelled.
* @param string $value the SQL statement to be set.
* @return Command this command instance
*/
public function setSql($value)
{
$this->_sql = $value;
$this->_params = array();
$this->cancel();
return $this;
}
/**
* Prepares the SQL statement to be executed.
* For complex SQL statement that is to be executed multiple times,
* this may improve performance.
* For SQL statement with binding parameters, this method is invoked
* automatically.
* @throws Exception if there is any DB error
*/
public function prepare()
{
if ($this->pdoStatement == null) {
$sql = $this->connection->expandTablePrefix($this->getSql());
try {
$this->pdoStatement = $this->connection->pdo->prepare($sql);
} catch (\Exception $e) {
\Yii::error($e->getMessage() . "\nFailed to prepare SQL: $sql", __CLASS__);
$errorInfo = $e instanceof \PDOException ? $e->errorInfo : null;
throw new Exception($e->getMessage(), (int)$e->getCode(), $errorInfo);
}
}
}
/**
* Cancels the execution of the SQL statement.
* This method mainly sets [[pdoStatement]] to be null.
*/
public function cancel()
{
$this->pdoStatement = null;
}
/**
* Binds a parameter to the SQL statement to be executed.
* @param string|integer $name parameter identifier. For a prepared statement
* using named placeholders, this will be a parameter name of
* the form `:name`. For a prepared statement using question mark
* placeholders, this will be the 1-indexed position of the parameter.
* @param mixed $value Name of the PHP variable to bind to the SQL statement parameter
* @param integer $dataType SQL data type of the parameter. If null, the type is determined by the PHP type of the value.
* @param integer $length length of the data type
* @param mixed $driverOptions the driver-specific options
* @return Command the current command being executed
* @see http://www.php.net/manual/en/function.PDOStatement-bindParam.php
*/
public function bindParam($name, &$value, $dataType = null, $length = null, $driverOptions = null)
{
$this->prepare();
if ($dataType === null) {
$this->pdoStatement->bindParam($name, $value, $this->connection->getPdoType(gettype($value)));
} elseif ($length === null) {
$this->pdoStatement->bindParam($name, $value, $dataType);
} elseif ($driverOptions === null) {
$this->pdoStatement->bindParam($name, $value, $dataType, $length);
} else {
$this->pdoStatement->bindParam($name, $value, $dataType, $length, $driverOptions);
}
$this->_params[$name] =& $value;
return $this;
}
/**
* Binds a value to a parameter.
* @param string|integer $name Parameter identifier. For a prepared statement
* using named placeholders, this will be a parameter name of
* the form `:name`. For a prepared statement using question mark
* placeholders, this will be the 1-indexed position of the parameter.
* @param mixed $value The value to bind to the parameter
* @param integer $dataType SQL data type of the parameter. If null, the type is determined by the PHP type of the value.
* @return Command the current command being executed
* @see http://www.php.net/manual/en/function.PDOStatement-bindValue.php
*/
public function bindValue($name, $value, $dataType = null)
{
$this->prepare();
if ($dataType === null) {
$this->pdoStatement->bindValue($name, $value, $this->connection->getPdoType(gettype($value)));
} else {
$this->pdoStatement->bindValue($name, $value, $dataType);
}
$this->_params[$name] = $value;
return $this;
}
/**
* Binds a list of values to the corresponding parameters.
* This is similar to [[bindValue()]] except that it binds multiple values at a time.
* Note that the SQL data type of each value is determined by its PHP type.
* @param array $values the values to be bound. This must be given in terms of an associative
* array with array keys being the parameter names, and array values the corresponding parameter values,
* e.g. `array(':name'=>'John', ':age'=>25)`. By default, the PDO type of each value is determined
* by its PHP type. You may explicitly specify the PDO type by using an array: `array(value, type)`,
* e.g. `array(':name'=>'John', ':profile'=>array($profile, \PDO::PARAM_LOB))`.
* @return Command the current command being executed
*/
public function bindValues($values)
{
if (!empty($values)) {
$this->prepare();
foreach ($values as $name => $value) {
if (is_array($value)) {
$type = $value[1];
$value = $value[0];
} else {
$type = $this->connection->getPdoType(gettype($value));
}
$this->pdoStatement->bindValue($name, $value, $type);
$this->_params[$name] = $value;
}
}
return $this;
}
/**
* Executes the SQL statement.
* This method should only be used for executing non-query SQL statement, such as `INSERT`, `DELETE`, `UPDATE` SQLs.
* No result set will be returned.
* @param array $params input parameters (name=>value) for the SQL execution. This is an alternative
* to [[bindValues()]]. Note that if you pass parameters in this way, any previous call to [[bindParam()]]
* or [[bindValue()]] will be ignored.
* @return integer number of rows affected by the execution.
* @throws Exception execution failed
*/
public function execute($params = array())
{
$sql = $this->connection->expandTablePrefix($this->getSql());
$this->_params = array_merge($this->_params, $params);
if ($this->_params === array()) {
$paramLog = '';
} else {
$paramLog = "\nParameters: " . var_export($this->_params, true);
}
\Yii::trace("Executing SQL: {$sql}{$paramLog}", __CLASS__);
try {
if ($this->connection->enableProfiling) {
\Yii::beginProfile(__METHOD__ . "($sql)", __CLASS__);
}
$this->prepare();
if ($params === array()) {
$this->pdoStatement->execute();
} else {
$this->pdoStatement->execute($params);
}
$n = $this->pdoStatement->rowCount();
if ($this->connection->enableProfiling) {
\Yii::endProfile(__METHOD__ . "($sql)", __CLASS__);
}
return $n;
} catch (\Exception $e) {
if ($this->connection->enableProfiling) {
\Yii::endProfile(__METHOD__ . "($sql)", __CLASS__);
}
$message = $e->getMessage();
\Yii::error("$message\nFailed to execute SQL: {$sql}{$paramLog}", __CLASS__);
$errorInfo = $e instanceof \PDOException ? $e->errorInfo : null;
throw new Exception($message, (int)$e->getCode(), $errorInfo);
}
}
/**
* Executes the SQL statement and returns query result.
* This method is for executing a SQL query that returns result set, such as `SELECT`.
* @param array $params input parameters (name=>value) for the SQL execution. This is an alternative
* to [[bindValues()]]. Note that if you pass parameters in this way, any previous call to [[bindParam()]]
* or [[bindValue()]] will be ignored.
* @return DataReader the reader object for fetching the query result
* @throws Exception execution failed
*/
public function query($params = array())
{
return $this->queryInternal('', $params);
}
/**
* Executes the SQL statement and returns ALL rows at once.
* @param array $params input parameters (name=>value) for the SQL execution. This is an alternative
* to [[bindValues()]]. Note that if you pass parameters in this way, any previous call to [[bindParam()]]
* or [[bindValue()]] will be ignored.
* @param mixed $fetchMode the result fetch mode. Please refer to [PHP manual](http://www.php.net/manual/en/function.PDOStatement-setFetchMode.php)
* for valid fetch modes. If this parameter is null, the value set in [[fetchMode]] will be used.
* @return array all rows of the query result. Each array element is an array representing a row of data.
* An empty array is returned if the query results in nothing.
* @throws Exception execution failed
*/
public function queryAll($params = array(), $fetchMode = null)
{
return $this->queryInternal('fetchAll', $params, $fetchMode);
}
/**
* Executes the SQL statement and returns the first row of the result.
* This method is best used when only the first row of result is needed for a query.
* @param array $params input parameters (name=>value) for the SQL execution. This is an alternative
* to [[bindValues()]]. Note that if you pass parameters in this way, any previous call to [[bindParam()]]
* or [[bindValue()]] will be ignored.
* @param mixed $fetchMode the result fetch mode. Please refer to [PHP manual](http://www.php.net/manual/en/function.PDOStatement-setFetchMode.php)
* for valid fetch modes. If this parameter is null, the value set in [[fetchMode]] will be used.
* @return array|boolean the first row (in terms of an array) of the query result. False is returned if the query
* results in nothing.
* @throws Exception execution failed
*/
public function queryRow($params = array(), $fetchMode = null)
{
return $this->queryInternal('fetch', $params, $fetchMode);
}
/**
* Executes the SQL statement and returns the value of the first column in the first row of data.
* This method is best used when only a single value is needed for a query.
* @param array $params input parameters (name=>value) for the SQL execution. This is an alternative
* to [[bindValues()]]. Note that if you pass parameters in this way, any previous call to [[bindParam()]]
* or [[bindValue()]] will be ignored.
* @return string|boolean the value of the first column in the first row of the query result.
* False is returned if there is no value.
* @throws Exception execution failed
*/
public function queryScalar($params = array())
{
$result = $this->queryInternal('fetchColumn', $params, 0);
if (is_resource($result) && get_resource_type($result) === 'stream') {
return stream_get_contents($result);
} else {
return $result;
}
}
/**
* Executes the SQL statement and returns the first column of the result.
* This method is best used when only the first column of result (i.e. the first element in each row)
* is needed for a query.
* @param array $params input parameters (name=>value) for the SQL execution. This is an alternative
* to [[bindValues()]]. Note that if you pass parameters in this way, any previous call to [[bindParam()]]
* or [[bindValue()]] will be ignored.
* @return array the first column of the query result. Empty array is returned if the query results in nothing.
* @throws Exception execution failed
*/
public function queryColumn($params = array())
{
return $this->queryInternal('fetchAll', $params, \PDO::FETCH_COLUMN);
}
/**
* Performs the actual DB query of a SQL statement.
* @param string $method method of PDOStatement to be called
* @param array $params input parameters (name=>value) for the SQL execution. This is an alternative
* to [[bindValues()]]. Note that if you pass parameters in this way, any previous call to [[bindParam()]]
* or [[bindValue()]] will be ignored.
* @param mixed $fetchMode the result fetch mode. Please refer to [PHP manual](http://www.php.net/manual/en/function.PDOStatement-setFetchMode.php)
* for valid fetch modes. If this parameter is null, the value set in [[fetchMode]] will be used.
* @return mixed the method execution result
*/
private function queryInternal($method, $params, $fetchMode = null)
{
$db = $this->connection;
$sql = $db->expandTablePrefix($this->getSql());
$this->_params = array_merge($this->_params, $params);
if ($this->_params === array()) {
$paramLog = '';
} else {
$paramLog = "\nParameters: " . var_export($this->_params, true);
}
\Yii::trace("Querying SQL: {$sql}{$paramLog}", __CLASS__);
if ($db->queryCachingCount > 0 && $db->queryCachingDuration >= 0 && $method !== '') {
$cache = \Yii::$application->getComponent($db->queryCacheID);
}
if (isset($cache)) {
$db->queryCachingCount--;
$cacheKey = __CLASS__ . "/{$db->dsn}/{$db->username}/$sql/$paramLog";
if (($result = $cache->get($cacheKey)) !== false) {
\Yii::trace('Query result found in cache', __CLASS__);
return $result;
}
}
try {
if ($db->enableProfiling) {
\Yii::beginProfile(__METHOD__ . "($sql)", __CLASS__);
}
$this->prepare();
if ($params === array()) {
$this->pdoStatement->execute();
} else {
$this->pdoStatement->execute($params);
}
if ($method === '') {
$result = new DataReader($this);
} else {
if ($fetchMode === null) {
$fetchMode = $this->fetchMode;
}
$result = call_user_func_array(array($this->pdoStatement, $method), (array)$fetchMode);
$this->pdoStatement->closeCursor();
}
if ($db->enableProfiling) {
\Yii::endProfile(__METHOD__ . "($sql)", __CLASS__);
}
if (isset($cache)) {
$cache->set($cacheKey, $result, $db->queryCachingDuration, $db->queryCachingDependency);
\Yii::trace('Saved query result in cache', __CLASS__);
}
return $result;
} catch (\Exception $e) {
if ($db->enableProfiling) {
\Yii::endProfile(__METHOD__ . "($sql)", __CLASS__);
}
$message = $e->getMessage();
\Yii::error("$message\nCommand::$method() failed: {$sql}{$paramLog}", __CLASS__);
$errorInfo = $e instanceof \PDOException ? $e->errorInfo : null;
throw new Exception($message, (int)$e->getCode(), $errorInfo);
}
}
}