Exception 'could not find driver' while migration in yii2

问题

This my stack trace:

  Exception 'yii\db\Exception' with message 'could not find driver'

in /opt/lampp/htdocs/advanced/vendor/yiisoft/yii2/db/Connection.php:534

#0 /opt/lampp/htdocs/advanced/vendor/yiisoft/yii2/db/Connection.php(836): yii\db\Connection->open()
        #1 /opt/lampp/htdocs/advanced/vendor/yiisoft/yii2/db/Connection.php(823): yii\db\Connection->getMasterPdo()
        #2 /opt/lampp/htdocs/advanced/vendor/yiisoft/yii2/db/Command.php(208): yii\db\Connection->getSlavePdo()
        #3 /opt/lampp/htdocs/advanced/vendor/yiisoft/yii2/db/Command.php(816): yii\db\Command->prepare(true)
        #4 /opt/lampp/htdocs/advanced/vendor/yiisoft/yii2/db/Command.php(350): yii\db\Command->queryInternal('fetchAll', NULL)
        #5 /opt/lampp/htdocs/advanced/vendor/yiisoft/yii2/db/mysql/Schema.php(198): yii\db\Command->queryAll()
        #6 /opt/lampp/htdocs/advanced/vendor/yiisoft/yii2/db/mysql/Schema.php(97): yii\db\mysql\Schema->findColumns(Object(yii\db\TableSchema))
        #7 /opt/lampp/htdocs/advanced/vendor/yiisoft/yii2/db/Schema.php(140): yii\db\mysql\Schema->loadTableSchema('migration')
        #8 /opt/lampp/htdocs/advanced/vendor/yiisoft/yii2/console/controllers/MigrateController.php(121): yii\db\Schema->getTableSchema('{{%migration}}', true)
        #9 /opt/lampp/htdocs/advanced/vendor/yiisoft/yii2/console/controllers/BaseMigrateController.php(610): yii\console\controllers\MigrateController->getMigrationHistory(NULL)
        #10 /opt/lampp/htdocs/advanced/vendor/yiisoft/yii2/console/controllers/BaseMigrateController.php(102): yii\console\controllers\BaseMigrateController->getNewMigrations()
        #11 [internal function]: yii\console\controllers\BaseMigrateController->actionUp(0)
        #12 /opt/lampp/htdocs/advanced/vendor/yiisoft/yii2/base/InlineAction.php(55): call_user_func_array(Array, Array)
        #13 /opt/lampp/htdocs/advanced/vendor/yiisoft/yii2/base/Controller.php(151): yii\base\InlineAction->runWithParams(Array)
        #14 /opt/lampp/htdocs/advanced/vendor/yiisoft/yii2/console/Controller.php(91): yii\base\Controller->runAction('', Array)
        #15 /opt/lampp/htdocs/advanced/vendor/yiisoft/yii2/base/Module.php(455): yii\console\Controller->runAction('', Array)
        #16 /opt/lampp/htdocs/advanced/vendor/yiisoft/yii2/console/Application.php(161): yii\base\Module->runAction('migrate', Array)
        #17 /opt/lampp/htdocs/advanced/vendor/yiisoft/yii2/console/Application.php(137): yii\console\Application->runAction('migrate', Array)
        #18 /opt/lampp/htdocs/advanced/vendor/yiisoft/yii2/base/Application.php(375): yii\console\Application->handleRequest(Object(yii\console\Request))
        #19 /opt/lampp/htdocs/advanced/yii(31): yii\base\Application->run()
        #20 {main}

I am new to yii2. I have added database name,username in advaced/common/config/main-local.php. Using xampp webserver and version of php is 5.6.8 and PDO is also enabled.

This is my db configuration.

'db' => [
        'class' => 'yii\db\Connection',
        'dsn' => 'mysql:host=localhost;dbname=yii2advanced',
        'username' => 'root',
        'password' => '',
        'charset' => 'utf8',
    ],

回答1:

Found this on Yii2

"Most likely it is your system config. If you are using packages like MAMP, XAMPP or other, you may need to change "localhost" to "127.0.0.1" in your db.php configuration file. Also if you are on Linux you may need to install some other additional packages like php5-mysql and stuff like that."

回答2:

I had a similar situation during Yii2 (Advanced) migration (Xampp in Ubuntu 14.04 and PHP)

This is the message i've got:

Exception 'yii\db\Exception' with message 'could not find driver'

So after googling and reading this thread and others I found out that could be the possible problem

the PHP extension "pdo_mysql" was disabled or not installed at all

and tried this at my terminal:

php -m

after realize that the module was not there...

sudo apt-get install php5-gd php5-mysql

and after a quick install the service must be re-started...

sudo /opt/lampp/lampp restart

....finally (retry migration)

php yii migrate

Migrated up successfully.

Hope you find it useful & work for others.

I found it at ask ubuntu but i'm unable to add a link or code, since this is my first post.

link: http://www.yiiframework.com/forum/index.php/topic/49450-error-on-migrate-command-advanced-yii2-app/

回答3:

I had exactly the same error. Searching, I found a Brazilian comment regarding a similar problem caused because he had two different php version installed in his computer.

I checked the /opt/lampp/bin directory and I found two different php versions, one just plain "php" and the other "php-5.6.8", so I decided to run the second version, and it works!

test@pctest:~$ /opt/lampp/bin/php-5.6.8 /opt/lampp/htdocs/advanced/yii migrate

回答4:

I had same error, but instead of xampp I used Fedora 25 with Apache, for me 'dnf install -y php-mysqlnd' fixed this error, so you are probably missing extension.