src/Db/Orm/BaseActiveRecord.php
public function update($runValidation = true, $attributeNames = null)
    {
        $basePromise = $runValidation
            ? new LazyPromise(function() use ($attributeNames) { return $this->validate($attributeNames); })
            : resolveLazy(true);
        return $basePromise
            ->otherwiseLazy(function() {
                return reject(new ValidationError("Model is not valid"));
            })->thenLazy(function() use ($attributeNames) {
                return $this->updateInternal($attributeNames);
            });
    }
public function update($runValidation = true, $attributeNames = null)
    {
        $basePromise = $runValidation
            ? new LazyPromise(function() use ($attributeNames) { return $this->validate($attributeNames); })
            : resolveLazy(true);
        return $basePromise
            ->otherwiseLazy(function() {
                return reject(new ValidationError("Model is not valid"));
            })->thenLazy(function() use ($attributeNames) {
                return $this->updateInternal($attributeNames);
            });
    }
Saves the changes to this active record into the associated database table.

This method performs the following steps in order:

1. call [[beforeValidate()]] when `$runValidation` is `true`. If [[beforeValidate()]]
returns `false`, the rest of the steps will be skipped;
2. call [[afterValidate()]] when `$runValidation` is `true`. If validation
failed, the rest of the steps will be skipped;
3. call [[beforeSave()]]. If [[beforeSave()]] returns `false`,
the rest of the steps will be skipped;
4. save the record into database. If this fails, it will skip the rest of the steps;
5. call [[afterSave()]];

In the above step 1, 2, 3 and 5, events [[EVENT_BEFORE_VALIDATE]],
[[EVENT_AFTER_VALIDATE]], [[EVENT_BEFORE_UPDATE]], and [[EVENT_AFTER_UPDATE]]
will be raised by the corresponding methods.

Only the [[dirtyAttributes|changed attribute values]] will be saved into database.

For example, to update a customer record:

```php
$customer = Customer::findOne($id);
$customer->name = $name;
$customer->email = $email;
$customer->update();
```

Note that it is possible the update does not affect any row in the table.
In this case, this method will return 0. For this reason, you should use the following
code to check if update() is successful or not:

```php
if ($customer->update() !== false) {
// update successful
} else {
// update failed
}
```

@param bool $runValidation whether to perform validation (calling [[validate()]])
before saving the record. Defaults to `true`. If the validation fails, the record
will not be saved to the database and this method will return `false`.
@param array $attributeNames list of attribute names that need to be saved. Defaults to null,
meaning all attributes that are loaded from DB will be saved.
@return ExtendedPromiseInterface with int|false the number of rows affected, or `false` if validation fails
or [[beforeSave()]] stops the updating process.
@throws StaleObjectException if [[optimisticLock|optimistic locking]] is enabled and the data
being updated is outdated.
@throws Exception in case update failed.