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标量值，如果该查询没有结果则返回 false
* @param type $sql
* @return type
*/
private function query_scalar($sql)
{
return $this->_getDb()->createCommand($sql)->queryScalar();
}
/**
* execute操作
* @param type $sql
* @return type
*/
private function execute($sql)
{
return $this->_getDb()->createCommand($sql)->execute();
}
/**
* sql过滤，后期安全扩展
* @param type $str
* @return type
*/
private function cleanString($value = '')
{
if (is_string($value)) {
$value = trim($value);
$value = stripslashes($value);
$value = mysqli_real_escape_string($value);
}
return $value;
}
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//-------------------------Yii2 END----------------------
//-------------------------Yii2 END----------------------
}
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