Database Exception – yii\db\Exception

     * @return mixed the value stored in cache, false if the value is not in the cache, expired,
     * or the dependency associated with the cached data has changed.
     */
    public function get($key)
    {
        $key = $this->buildKey($key);
        $value = $this->getValue($key);
        if ($value === false || $this->serializer === false) {
            return $value;
        } elseif ($this->serializer === null) {
            $value = unserialize($value);
        } else {
            $value = call_user_func($this->serializer[1], $value);

        if (is_string($this->cache)) {
            $this->cache = Yii::$app->get($this->cache, false);
        }
        if ($this->cache instanceof Cache) {
            $cacheKey = __CLASS__;
            $hash = md5(json_encode($this->rules));
            if (($data = $this->cache->get($cacheKey)) !== false && isset($data[1]) && $data[1] === $hash) {
                $this->rules = $data[0];
            } else {
                $this->rules = $this->buildRules($this->rules);
                $this->cache->set($cacheKey, [$this->rules, $hash]);
            }
        } else {

     */
    public function __construct($config = [])
    {
        if (!empty($config)) {
            Yii::configure($this, $config);
        }
        $this->init();
    }
 
    /**
     * Initializes the object.
     * This method is invoked at the end of the constructor after the object is initialized with the
     * given configuration.

            return $reflection->newInstanceArgs($dependencies);
        }
 
        if (!empty($dependencies) && $reflection->implementsInterface('yii\base\Configurable')) {
            // set $config as the last parameter (existing one will be overwritten)
            $dependencies[count($dependencies) - 1] = $config;
            return $reflection->newInstanceArgs($dependencies);
        } else {
            $object = $reflection->newInstanceArgs($dependencies);
            foreach ($config as $name => $value) {
                $object->$name = $value;
            }
            return $object;

    public function get($class, $params = [], $config = [])
    {
        if (isset($this->_singletons[$class])) {
            // singleton
            return $this->_singletons[$class];
        } elseif (!isset($this->_definitions[$class])) {
            return $this->build($class, $params, $config);
        }
 
        $definition = $this->_definitions[$class];
 
        if (is_callable($definition, true)) {
            $params = $this->resolveDependencies($this->mergeParams($class, $params));

    {
        if (is_string($type)) {
            return static::$container->get($type, $params);
        } elseif (is_array($type) && isset($type['class'])) {
            $class = $type['class'];
            unset($type['class']);
            return static::$container->get($class, $params, $type);
        } elseif (is_callable($type, true)) {
            return call_user_func($type, $params);
        } elseif (is_array($type)) {
            throw new InvalidConfigException('Object configuration must be an array containing a "class" element.');
        } else {
            throw new InvalidConfigException("Unsupported configuration type: " . gettype($type));

 
        if (isset($this->_definitions[$id])) {
            $definition = $this->_definitions[$id];
            if (is_object($definition) && !$definition instanceof Closure) {
                return $this->_components[$id] = $definition;
            } else {
                return $this->_components[$id] = Yii::createObject($definition);
            }
        } elseif ($throwException) {
            throw new InvalidConfigException("Unknown component ID: $id");
        } else {
            return null;
        }

    /**
     * Returns the URL manager for this application.
     * @return \yii\web\UrlManager the URL manager for this application.
     */
    public function getUrlManager()
    {
        return $this->get('urlManager');
    }
 
    /**
     * Returns the internationalization (i18n) component
     * @return \yii\i18n\I18N the internationalization application component.
     */

     * Resolves the current request into a route and the associated parameters.
     * @return array the first element is the route, and the second is the associated parameters.
     * @throws NotFoundHttpException if the request cannot be resolved.
     */
    public function resolve()
    {
        $result = Yii::$app->getUrlManager()->parseRequest($this);
        if ($result !== false) {
            list ($route, $params) = $result;
            if ($this->_queryParams === null) {
                $_GET = $params + $_GET; // preserve numeric keys
            } else {
                $this->_queryParams = $params + $this->_queryParams;

     * @return Response the resulting response
     * @throws NotFoundHttpException if the requested route is invalid
     */
    public function handleRequest($request)
    {
        if (empty($this->catchAll)) {
            list ($route, $params) = $request->resolve();
        } else {
            $route = $this->catchAll[0];
            $params = $this->catchAll;
            unset($params[0]);
        }
        try {

        try {
 
            $this->state = self::STATE_BEFORE_REQUEST;
            $this->trigger(self::EVENT_BEFORE_REQUEST);
 
            $this->state = self::STATE_HANDLING_REQUEST;
            $response = $this->handleRequest($this->getRequest());
 
            $this->state = self::STATE_AFTER_REQUEST;
            $this->trigger(self::EVENT_AFTER_REQUEST);
 
            $this->state = self::STATE_SENDING_RESPONSE;
            $response->send();