diff --git a/extensions/sphinx/Command.php b/extensions/sphinx/Command.php
index 2c0b5ed..93c02f8 100644
--- a/extensions/sphinx/Command.php
+++ b/extensions/sphinx/Command.php
@@ -8,9 +8,7 @@
 namespace yii\sphinx;
 
 use Yii;
-use yii\base\Component;
-use yii\caching\Cache;
-use yii\db\Exception;
+use yii\base\NotSupportedException;
 
 /**
  * Command represents a SQL statement to be executed against a Sphinx.
@@ -41,406 +39,14 @@ use yii\db\Exception;
  *
  * To build SELECT SQL statements, please use [[Query]] and [[QueryBuilder]] instead.
  *
- * @property string $rawSql The raw SQL with parameter values inserted into the corresponding placeholders in
- * [[sql]]. This property is read-only.
- * @property string $sql The SQL statement to be executed.
+ * @property \yii\sphinx\Connection $db the Sphinx connection that this command is associated with.
  *
  * @author Paul Klimov <klimov.paul@gmail.com>
  * @since 2.0
  */
-class Command extends Component
+class Command extends \yii\db\Command
 {
 	/**
-	 * @var Connection the Sphinx connection that this command is associated with
-	 */
-	public $db;
-	/**
-	 * @var \PDOStatement the PDOStatement object that this command is associated with
-	 */
-	public $pdoStatement;
-	/**
-	 * @var integer the default fetch mode for this command.
-	 * @see http://www.php.net/manual/en/function.PDOStatement-setFetchMode.php
-	 */
-	public $fetchMode = \PDO::FETCH_ASSOC;
-	/**
-	 * @var array the parameters (name => value) that are bound to the current PDO statement.
-	 * This property is maintained by methods such as [[bindValue()]].
-	 * Do not modify it directly.
-	 */
-	public $params = [];
-	/**
-	 * @var string the SphinxQL statement that this command represents
-	 */
-	private $_sql;
-
-	/**
-	 * 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.
-	 * The previous SQL execution (if any) will be cancelled, and [[params]] will be cleared as well.
-	 * @param string $sql the SQL statement to be set.
-	 * @return static this command instance
-	 */
-	public function setSql($sql)
-	{
-		if ($sql !== $this->_sql) {
-			$this->cancel();
-			$this->_sql = $this->db->quoteSql($sql);
-			$this->params = [];
-		}
-		return $this;
-	}
-
-	/**
-	 * Returns the raw SQL by inserting parameter values into the corresponding placeholders in [[sql]].
-	 * Note that the return value of this method should mainly be used for logging purpose.
-	 * It is likely that this method returns an invalid SQL due to improper replacement of parameter placeholders.
-	 * @return string the raw SQL with parameter values inserted into the corresponding placeholders in [[sql]].
-	 */
-	public function getRawSql()
-	{
-		if (empty($this->params)) {
-			return $this->_sql;
-		} else {
-			$params = [];
-			foreach ($this->params as $name => $value) {
-				if (is_string($value)) {
-					$params[$name] = $this->db->quoteValue($value);
-				} elseif ($value === null) {
-					$params[$name] = 'NULL';
-				} else {
-					$params[$name] = $value;
-				}
-			}
-			if (isset($params[1])) {
-				$sql = '';
-				foreach (explode('?', $this->_sql) as $i => $part) {
-					$sql .= (isset($params[$i]) ? $params[$i] : '') . $part;
-				}
-				return $sql;
-			} else {
-				return strtr($this->_sql, $params);
-			}
-		}
-	}
-
-	/**
-	 * Prepares the SQL statement to be executed.
-	 * For complex SQL statement that is to be executed multiple times,
-	 * this may improve performance.
-	 * For SQL statement with binding parameters, this method is invoked
-	 * automatically.
-	 * @throws Exception if there is any DB error
-	 */
-	public function prepare()
-	{
-		if ($this->pdoStatement == null) {
-			$sql = $this->getSql();
-			try {
-				$this->pdoStatement = $this->db->pdo->prepare($sql);
-			} catch (\Exception $e) {
-				$message = $e->getMessage() . "\nFailed to prepare SQL: $sql";
-				$errorInfo = $e instanceof \PDOException ? $e->errorInfo : null;
-				throw new Exception($message, $errorInfo, (int)$e->getCode(), $e);
-			}
-		}
-	}
-
-	/**
-	 * 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 $driverOptions the driver-specific options
-	 * @return static the current command being executed
-	 * @see http://www.php.net/manual/en/function.PDOStatement-bindParam.php
-	 */
-	public function bindParam($name, &$value, $dataType = null, $length = null, $driverOptions = null)
-	{
-		$this->prepare();
-		if ($dataType === null) {
-			$dataType = $this->db->getSchema()->getPdoType($value);
-		}
-		if ($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 $dataType SQL data type of the parameter. If null, the type is determined by the PHP type of the value.
-	 * @return static the current command being executed
-	 * @see http://www.php.net/manual/en/function.PDOStatement-bindValue.php
-	 */
-	public function bindValue($name, $value, $dataType = null)
-	{
-		$this->prepare();
-		if ($dataType === null) {
-			$dataType = $this->db->getSchema()->getPdoType($value);
-		}
-		$this->pdoStatement->bindValue($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 $values the values to be bound. This must be given in terms of an associative
-	 * array with array keys being the parameter names, and array values the corresponding parameter values,
-	 * e.g. `[':name' => 'John', ':age' => 25]`. By default, the PDO type of each value is determined
-	 * by its PHP type. You may explicitly specify the PDO type by using an array: `[value, type]`,
-	 * e.g. `[':name' => 'John', ':profile' => [$profile, \PDO::PARAM_LOB]]`.
-	 * @return static 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 = $this->db->getSchema()->getPdoType($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.
-	 * @return integer number of rows affected by the execution.
-	 * @throws Exception execution failed
-	 */
-	public function execute()
-	{
-		$sql = $this->getSql();
-
-		$rawSql = $this->getRawSql();
-
-		Yii::trace($rawSql, __METHOD__);
-
-		if ($sql == '') {
-			return 0;
-		}
-
-		$token = $rawSql;
-		try {
-			Yii::beginProfile($token, __METHOD__);
-
-			$this->prepare();
-			$this->pdoStatement->execute();
-			$n = $this->pdoStatement->rowCount();
-
-			Yii::endProfile($token, __METHOD__);
-			return $n;
-		} catch (\Exception $e) {
-			Yii::endProfile($token, __METHOD__);
-			$message = $e->getMessage() . "\nThe SQL being executed was: $rawSql";
-			$errorInfo = $e instanceof \PDOException ? $e->errorInfo : null;
-			throw new Exception($message, $errorInfo, (int)$e->getCode(), $e);
-		}
-	}
-
-	/**
-	 * Executes the SQL statement and returns query result.
-	 * This method is for executing a SQL query that returns result set, such as `SELECT`.
-	 * @return DataReader the reader object for fetching the query result
-	 * @throws Exception execution failed
-	 */
-	public function query()
-	{
-		return $this->queryInternal('');
-	}
-
-	/**
-	 * Executes the SQL statement and returns ALL rows at once.
-	 * @param integer $fetchMode the result fetch mode. Please refer to [PHP manual](http://www.php.net/manual/en/function.PDOStatement-setFetchMode.php)
-	 * for valid fetch modes. If this parameter is null, the value set in [[fetchMode]] will be used.
-	 * @return array all rows of the query result. Each array element is an array representing a row of data.
-	 * An empty array is returned if the query results in nothing.
-	 * @throws Exception execution failed
-	 */
-	public function queryAll($fetchMode = null)
-	{
-		return $this->queryInternal('fetchAll', $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 integer $fetchMode the result fetch mode. Please refer to [PHP manual](http://www.php.net/manual/en/function.PDOStatement-setFetchMode.php)
-	 * for valid fetch modes. If this parameter is null, the value set in [[fetchMode]] will be used.
-	 * @return array|boolean the first row (in terms of an array) of the query result. False is returned if the query
-	 * results in nothing.
-	 * @throws Exception execution failed
-	 */
-	public function queryOne($fetchMode = null)
-	{
-		return $this->queryInternal('fetch', $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.
-	 * @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()
-	{
-		$result = $this->queryInternal('fetchColumn', 0);
-		if (is_resource($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.
-	 * @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()
-	{
-		return $this->queryInternal('fetchAll', \PDO::FETCH_COLUMN);
-	}
-
-	/**
-	 * Performs the actual DB query of a SQL statement.
-	 * @param string $method method of PDOStatement to be called
-	 * @param integer $fetchMode the result fetch mode. Please refer to [PHP manual](http://www.php.net/manual/en/function.PDOStatement-setFetchMode.php)
-	 * for valid fetch modes. If this parameter is null, the value set in [[fetchMode]] will be used.
-	 * @return mixed the method execution result
-	 * @throws Exception if the query causes any problem
-	 */
-	private function queryInternal($method, $fetchMode = null)
-	{
-		$db = $this->db;
-		$rawSql = $this->getRawSql();
-
-		Yii::trace($rawSql, __METHOD__);
-
-		/** @var $cache \yii\caching\Cache */
-		if ($db->enableQueryCache && $method !== '') {
-			$cache = is_string($db->queryCache) ? Yii::$app->getComponent($db->queryCache) : $db->queryCache;
-		}
-
-		if (isset($cache) && $cache instanceof Cache) {
-			$cacheKey = [
-				__CLASS__,
-				$db->dsn,
-				$db->username,
-				$rawSql,
-			];
-			if (($result = $cache->get($cacheKey)) !== false) {
-				Yii::trace('Query result served from cache', __METHOD__);
-				return $result;
-			}
-		}
-
-		$token = $rawSql;
-		try {
-			Yii::beginProfile($token, __METHOD__);
-
-			$this->prepare();
-			$this->pdoStatement->execute();
-
-			if ($method === '') {
-				$result = new DataReader($this);
-			} else {
-				if ($fetchMode === null) {
-					$fetchMode = $this->fetchMode;
-				}
-				$result = call_user_func_array([$this->pdoStatement, $method], (array)$fetchMode);
-				$this->pdoStatement->closeCursor();
-			}
-
-			Yii::endProfile($token, __METHOD__);
-
-			if (isset($cache, $cacheKey) && $cache instanceof Cache) {
-				$cache->set($cacheKey, $result, $db->queryCacheDuration, $db->queryCacheDependency);
-				Yii::trace('Saved query result in cache', __METHOD__);
-			}
-
-			return $result;
-		} catch (\Exception $e) {
-			Yii::endProfile($token, __METHOD__);
-			$message = $e->getMessage()  . "\nThe SQL being executed was: $rawSql";
-			$errorInfo = $e instanceof \PDOException ? $e->errorInfo : null;
-			throw new Exception($message, $errorInfo, (int)$e->getCode(), $e);
-		}
-	}
-
-	/**
-	 * Creates an INSERT command.
-	 * For example,
-	 *
-	 * ~~~
-	 * $connection->createCommand()->insert('idx_user', [
-	 *     'name' => 'Sam',
-	 *     'age' => 30,
-	 * ])->execute();
-	 * ~~~
-	 *
-	 * The method will properly escape the column names, and bind the values to be inserted.
-	 *
-	 * Note that the created command is not executed until [[execute()]] is called.
-	 *
-	 * @param string $index the index that new rows will be inserted into.
-	 * @param array $columns the column data (name => value) to be inserted into the index.
-	 * @return static the command object itself
-	 */
-	public function insert($index, $columns)
-	{
-		$params = [];
-		$sql = $this->db->getQueryBuilder()->insert($index, $columns, $params);
-		return $this->setSql($sql)->bindValues($params);
-	}
-
-	/**
 	 * Creates a batch INSERT command.
 	 * For example,
 	 *
@@ -545,30 +151,6 @@ class Command extends Component
 	}
 
 	/**
-	 * Creates a DELETE command.
-	 * For example,
-	 *
-	 * ~~~
-	 * $connection->createCommand()->delete('tbl_user', 'status = 0')->execute();
-	 * ~~~
-	 *
-	 * The method will properly escape the index and column names.
-	 *
-	 * Note that the created command is not executed until [[execute()]] is called.
-	 *
-	 * @param string $index the index where the data will be deleted from.
-	 * @param string|array $condition the condition that will be put in the WHERE part. Please
-	 * refer to [[Query::where()]] on how to specify condition.
-	 * @param array $params the parameters to be bound to the command
-	 * @return static the command object itself
-	 */
-	public function delete($index, $condition = '', $params = [])
-	{
-		$sql = $this->db->getQueryBuilder()->delete($index, $condition, $params);
-		return $this->setSql($sql)->bindValues($params);
-	}
-
-	/**
 	 * Creates a SQL command for truncating a runtime index.
 	 * @param string $index the index to be truncated. The name will be properly quoted by the method.
 	 * @return static the command object itself
@@ -608,4 +190,134 @@ class Command extends Component
 		$sql = $this->db->getQueryBuilder()->callKeywords($index, $text, $fetchStatistic, $params);
 		return $this->setSql($sql)->bindValues($params);
 	}
+
+	// Not Supported :
+
+	/**
+	 * @inheritdoc
+	 */
+	public function createTable($table, $columns, $options = null)
+	{
+		throw new NotSupportedException('"' . __METHOD__ . '" is not supported.');
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function renameTable($table, $newName)
+	{
+		throw new NotSupportedException('"' . __METHOD__ . '" is not supported.');
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function dropTable($table)
+	{
+		throw new NotSupportedException('"' . __METHOD__ . '" is not supported.');
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function truncateTable($table)
+	{
+		throw new NotSupportedException('"' . __METHOD__ . '" is not supported.');
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function addColumn($table, $column, $type)
+	{
+		throw new NotSupportedException('"' . __METHOD__ . '" is not supported.');
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function dropColumn($table, $column)
+	{
+		throw new NotSupportedException('"' . __METHOD__ . '" is not supported.');
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function renameColumn($table, $oldName, $newName)
+	{
+		throw new NotSupportedException('"' . __METHOD__ . '" is not supported.');
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function alterColumn($table, $column, $type)
+	{
+		throw new NotSupportedException('"' . __METHOD__ . '" is not supported.');
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function addPrimaryKey($name, $table, $columns)
+	{
+		throw new NotSupportedException('"' . __METHOD__ . '" is not supported.');
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function dropPrimaryKey($name, $table)
+	{
+		throw new NotSupportedException('"' . __METHOD__ . '" is not supported.');
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function addForeignKey($name, $table, $columns, $refTable, $refColumns, $delete = null, $update = null)
+	{
+		throw new NotSupportedException('"' . __METHOD__ . '" is not supported.');
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function dropForeignKey($name, $table)
+	{
+		throw new NotSupportedException('"' . __METHOD__ . '" is not supported.');
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function createIndex($name, $table, $columns, $unique = false)
+	{
+		throw new NotSupportedException('"' . __METHOD__ . '" is not supported.');
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function dropIndex($name, $table)
+	{
+		throw new NotSupportedException('"' . __METHOD__ . '" is not supported.');
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function resetSequence($table, $value = null)
+	{
+		throw new NotSupportedException('"' . __METHOD__ . '" is not supported.');
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	public function checkIntegrity($check = true, $schema = '')
+	{
+		throw new NotSupportedException('"' . __METHOD__ . '" is not supported.');
+	}
 }
\ No newline at end of file
diff --git a/extensions/sphinx/DataReader.php b/extensions/sphinx/DataReader.php
deleted file mode 100644
index 4b8ffe5..0000000
--- a/extensions/sphinx/DataReader.php
+++ /dev/null
@@ -1,265 +0,0 @@
-<?php
-/**
- * @link http://www.yiiframework.com/
- * @copyright Copyright (c) 2008 Yii Software LLC
- * @license http://www.yiiframework.com/license/
- */
-
-namespace yii\sphinx;
-
-use yii\base\InvalidCallException;
-use yii\base\Object;
-
-/**
- * DataReader represents a forward-only stream of rows from a query result set.
- *
- * To read the current row of data, call [[read()]]. The method [[readAll()]]
- * returns all the rows in a single array. Rows of data can also be read by
- * iterating through the reader. For example,
- *
- * ~~~
- * $reader = $command->query('SELECT * FROM idx_post');
- *
- * while ($row = $reader->read()) {
- *     $rows[] = $row;
- * }
- *
- * // equivalent to:
- * foreach ($reader as $row) {
- *     $rows[] = $row;
- * }
- *
- * // equivalent to:
- * $rows = $reader->readAll();
- * ~~~
- *
- * Note that since DataReader is a forward-only stream, you can only traverse it once.
- * Doing it the second time will throw an exception.
- *
- * It is possible to use a specific mode of data fetching by setting
- * [[fetchMode]]. See the [PHP manual](http://www.php.net/manual/en/function.PDOStatement-setFetchMode.php)
- * for more details about possible fetch mode.
- *
- * @property integer $columnCount The number of columns in the result set. This property is read-only.
- * @property integer $fetchMode Fetch mode. This property is write-only.
- * @property boolean $isClosed Whether the reader is closed or not. This property is read-only.
- * @property integer $rowCount Number of rows contained in the result. This property is read-only.
- *
- * @author Qiang Xue <qiang.xue@gmail.com>
- * @since 2.0
- */
-class DataReader extends Object implements \Iterator, \Countable
-{
-	/**
-	 * @var \PDOStatement the PDOStatement associated with the command
-	 */
-	private $_statement;
-	private $_closed = false;
-	private $_row;
-	private $_index = -1;
-
-	/**
-	 * Constructor.
-	 * @param Command $command the command generating the query result
-	 * @param array $config name-value pairs that will be used to initialize the object properties
-	 */
-	public function __construct(Command $command, $config = [])
-	{
-		$this->_statement = $command->pdoStatement;
-		$this->_statement->setFetchMode(\PDO::FETCH_ASSOC);
-		parent::__construct($config);
-	}
-
-	/**
-	 * Binds a column to a PHP variable.
-	 * When rows of data are being fetched, the corresponding column value
-	 * will be set in the variable. Note, the fetch mode must include PDO::FETCH_BOUND.
-	 * @param integer|string $column Number of the column (1-indexed) or name of the column
-	 * in the result set. If using the column name, be aware that the name
-	 * should match the case of the column, as returned by the driver.
-	 * @param mixed $value Name of the PHP variable to which the column will be bound.
-	 * @param integer $dataType Data type of the parameter
-	 * @see http://www.php.net/manual/en/function.PDOStatement-bindColumn.php
-	 */
-	public function bindColumn($column, &$value, $dataType = null)
-	{
-		if ($dataType === null) {
-			$this->_statement->bindColumn($column, $value);
-		} else {
-			$this->_statement->bindColumn($column, $value, $dataType);
-		}
-	}
-
-	/**
-	 * Set the default fetch mode for this statement
-	 * @param integer $mode fetch mode
-	 * @see http://www.php.net/manual/en/function.PDOStatement-setFetchMode.php
-	 */
-	public function setFetchMode($mode)
-	{
-		$params = func_get_args();
-		call_user_func_array([$this->_statement, 'setFetchMode'], $params);
-	}
-
-	/**
-	 * Advances the reader to the next row in a result set.
-	 * @return array the current row, false if no more row available
-	 */
-	public function read()
-	{
-		return $this->_statement->fetch();
-	}
-
-	/**
-	 * Returns a single column from the next row of a result set.
-	 * @param integer $columnIndex zero-based column index
-	 * @return mixed the column of the current row, false if no more rows available
-	 */
-	public function readColumn($columnIndex)
-	{
-		return $this->_statement->fetchColumn($columnIndex);
-	}
-
-	/**
-	 * Returns an object populated with the next row of data.
-	 * @param string $className class name of the object to be created and populated
-	 * @param array $fields Elements of this array are passed to the constructor
-	 * @return mixed the populated object, false if no more row of data available
-	 */
-	public function readObject($className, $fields)
-	{
-		return $this->_statement->fetchObject($className, $fields);
-	}
-
-	/**
-	 * Reads the whole result set into an array.
-	 * @return array the result set (each array element represents a row of data).
-	 * An empty array will be returned if the result contains no row.
-	 */
-	public function readAll()
-	{
-		return $this->_statement->fetchAll();
-	}
-
-	/**
-	 * Advances the reader to the next result when reading the results of a batch of statements.
-	 * This method is only useful when there are multiple result sets
-	 * returned by the query. Not all DBMS support this feature.
-	 * @return boolean Returns true on success or false on failure.
-	 */
-	public function nextResult()
-	{
-		if (($result = $this->_statement->nextRowset()) !== false) {
-			$this->_index = -1;
-		}
-		return $result;
-	}
-
-	/**
-	 * Closes the reader.
-	 * This frees up the resources allocated for executing this SQL statement.
-	 * Read attempts after this method call are unpredictable.
-	 */
-	public function close()
-	{
-		$this->_statement->closeCursor();
-		$this->_closed = true;
-	}
-
-	/**
-	 * whether the reader is closed or not.
-	 * @return boolean whether the reader is closed or not.
-	 */
-	public function getIsClosed()
-	{
-		return $this->_closed;
-	}
-
-	/**
-	 * Returns the number of rows in the result set.
-	 * Note, most DBMS may not give a meaningful count.
-	 * In this case, use "SELECT COUNT(*) FROM tableName" to obtain the number of rows.
-	 * @return integer number of rows contained in the result.
-	 */
-	public function getRowCount()
-	{
-		return $this->_statement->rowCount();
-	}
-
-	/**
-	 * Returns the number of rows in the result set.
-	 * This method is required by the Countable interface.
-	 * Note, most DBMS may not give a meaningful count.
-	 * In this case, use "SELECT COUNT(*) FROM tableName" to obtain the number of rows.
-	 * @return integer number of rows contained in the result.
-	 */
-	public function count()
-	{
-		return $this->getRowCount();
-	}
-
-	/**
-	 * Returns the number of columns in the result set.
-	 * Note, even there's no row in the reader, this still gives correct column number.
-	 * @return integer the number of columns in the result set.
-	 */
-	public function getColumnCount()
-	{
-		return $this->_statement->columnCount();
-	}
-
-	/**
-	 * Resets the iterator to the initial state.
-	 * This method is required by the interface Iterator.
-	 * @throws InvalidCallException if this method is invoked twice
-	 */
-	public function rewind()
-	{
-		if ($this->_index < 0) {
-			$this->_row = $this->_statement->fetch();
-			$this->_index = 0;
-		} else {
-			throw new InvalidCallException('DataReader cannot rewind. It is a forward-only reader.');
-		}
-	}
-
-	/**
-	 * Returns the index of the current row.
-	 * This method is required by the interface Iterator.
-	 * @return integer the index of the current row.
-	 */
-	public function key()
-	{
-		return $this->_index;
-	}
-
-	/**
-	 * Returns the current row.
-	 * This method is required by the interface Iterator.
-	 * @return mixed the current row.
-	 */
-	public function current()
-	{
-		return $this->_row;
-	}
-
-	/**
-	 * Moves the internal pointer to the next row.
-	 * This method is required by the interface Iterator.
-	 */
-	public function next()
-	{
-		$this->_row = $this->_statement->fetch();
-		$this->_index++;
-	}
-
-	/**
-	 * Returns whether there is a row of data at current position.
-	 * This method is required by the interface Iterator.
-	 * @return boolean whether there is a row of data at current position.
-	 */
-	public function valid()
-	{
-		return $this->_row !== false;
-	}
-}
\ No newline at end of file
diff --git a/tests/unit/extensions/sphinx/CommandTest.php b/tests/unit/extensions/sphinx/CommandTest.php
index e83fad2..b2346ef 100644
--- a/tests/unit/extensions/sphinx/CommandTest.php
+++ b/tests/unit/extensions/sphinx/CommandTest.php
@@ -2,8 +2,7 @@
 
 namespace yiiunit\extensions\sphinx;
 
-use yii\sphinx\DataReader;
-use yii\db\Expression;
+use yii\db\DataReader;
 
 /**
  * @group sphinx