Yii 1x to yii 2x details change

Yii2The default format for returning table name values is {{%user}}
and Yii1is returned in the {{user}}
Look at the source code, found that in Yii1Of

path\to\yii\framework\db\schema\cdbschema.php line78

if($this->_connection->tablePrefix!==null && strpos($name,'{{')!==false)            $realName=preg_replace('/\{\{(.*?)\}\}/',$this->_connection->tablePrefix.'$1',$name);        else            $realName=$name;

and Yii2 the

path\to\vendor\yiisoft\yii2\db\connection.php line795

return preg_replace_callback(        '/(\\{\\{(%?[\w\-\. ]+%?)\\}\\}|\\[\\[([\w\-\. ]+)\\]\\])/',        function ($matches) {            if (isset($matches[3])) {                return $this->quoteColumnName($matches[3]);            } else {                return str_replace('%', $this->tablePrefix, $this->quoteTableName($matches[2]));            }        },        $sql    );

It will be found that not only the class of the call is changed, but even the method is changed, and the change of the str_place prg_replace regular expression can be observed at the same time instead of being fast outdated, so % what is the new one behind? I thought it was the suffix, read the source code and there is no other things, run it is just a simple replacement. This means that each addition is % replaced by a prefix. Maybe the author would like to add a suffix for the convenience of other people.

Take a look at the back of the regular \\[\\[([\w\-\. ]+)\\]\\]) , if the table name is said [[user]] , then the call is $this->quoteColumnName($matches[3]); returned `user` , the outer set of an anti-quotation mark, the generated SQL statement has been inverted quotation marks, so the table name is not used [[xxx]] for nesting.

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The above describes the Yii 1x to Yii 2x of the details of the changes, including the aspects of the content, I hope that the PHP tutorial interested in a friend helpful.

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