参考地址: https://blog.csdn.net/xinren369/article/details/51865424
public function actionTableField(){
$tableName= 'member'; (表名)
$db = Yii::$app->getDb();
$table = $db->createCommand("SHOW TABLES LIKE '".$tableName."'")->queryAll(); (获取数据库名字)
$r=$db->getSchema()->getTableNames();//获取表名
$r=$db->getSchema()->getTableSchema($tableName); //获取表字段名
}