$components public property The list of the component definitions or the loaded component instances (ID => definition or instance). public array getComponents ( $returnDefinitions = true )public void setComponents ( $components )

$security public read-only property The security application component. public yii\base\Security getSecurity ( )

renameColumn() public method Creates a SQL command for renaming a column. public $this renameColumn ( $table, $oldName, $newName )$table string The table whose column is to be renamed. The name will be properly quoted by the method. $oldName string The old name of the column. The name will be properly quoted by the method. $newName string The new name of the column. The name will be properly quoted by the method. return $this The command object itself

$migrationTable public property The name of the table for keeping applied migration information. public string $migrationTable = '{{%migration}}'

$singleton public write-only property Class name, interface name or alias name public $this setSingleton ( $class, $definition = [], array $params = [] )

getDb() protected abstract method protected abstract yii\db\Connection getDb ( )return yii\db\Connection The database connection to be used for schema building.

addCommentOnColumn() public method (available since version 2.0.8) Builds a SQL command for adding comment to column public $this addCommentOnColumn ( $table, $column, $comment )$table string The table whose column is to be commented. The table name will be properly quoted by the method. $column string The name of the column to be commented. The column name will be properly quoted by the method. $comment string The text of the comment to be added. The comment will be properly quoted

renderItems() protected method Renders collapsible items as specified on $items. protected string renderItems ( )return string The rendering result. throws \yii\jui\InvalidConfigException.

getIsHead() public method Returns whether this is a HEAD request. public boolean getIsHead ( )return boolean Whether this is a HEAD request.

getValue() protected method Retrieves a value from cache with a specified key. This method should be implemented by child classes to retrieve the data from specific cache storage. protected string|boolean getValue ( $key )$key string A unique key identifying the cached value return string|boolean The value stored in cache, false if the value is not in the cache or expired.