Klimov Paul c17766181f Added QueryInterface::emulateExecution() ...

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 #12390
fixes #6373
close #12708

2016-12-02 13:28:51 +01:00

14 KiB

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