Added `QueryInterface::emulateExecution()`, which allows preventing of
the actual query execution.
This allows to cancel `DataProvider` preventing search query execution
in case search model is invalid:
``` php
public function search($params)
{
$query = Item::find();
$dataProvider = new ActiveDataProvider([
'query' => $query,
]);
$this->load($params);
if (!$this->validate()) {
$query->where('0=1');
$query->emulateExecution(); // No SQL execution will be done
return $dataProvider;
}
```
This also fix unecessary query in case of `via()` usage. See #12390.
fixes#12390fixes#6373close#12708
- changed test class naming for easier copying and searching of classes
- made base tests abstract and made MySQL an equal citisen in the test
hierarchie
- added missing db specific test classes
Basic implementation proposal for yiisoft/yii2#2022
Shortcomings/todo's:
* filtering on non-scalars (where IN statements) not supported
* Numeric properties with a corresponding validation rule will yield
errors when they contain an alphanumeric operator. These properties'
rules should be defined as 'string' or 'safe'.
* no implementation example in Gii code (yet).
close#8505
