laravel安装nova 运行php artisan migrate出错

报错一
$ php artisan migrate

IlluminateDatabaseQueryException : could not find driver (SQL: select * fr
om information_schema.tables where table_schema = dev_oms and table_name = migra
tions)

at D:WWWdev_omsvendorlaravelframeworksrcIlluminateDatabaseConnection.
php:664
660| // If an exception occurs when attempting to run a query, we'll
format the error
661| // message to include the bindings with SQL, which will make th
is exception a
662| // lot more helpful to the developer instead of just the databa
se's errors.
663| catch (Exception $e) {
> 664| throw new QueryException(
665| $query, $this->prepareBindings($bindings), $e
666| );
667| }
668|

Exception trace:

1 PDOException::("could not find driver")
D:WWWdev_omsvendorlaravelframeworksrcIlluminateDatabaseConnectors
Connector.php:68

2 PDO::__construct("mysql:host=127.0.0.1;port=3306;dbname=dev_oms", "root",
"root", [])
D:WWWdev_omsvendorlaravelframeworksrcIlluminateDatabaseConnectors
Connector.php:68

Please use the argument -v to see more details.
原因是php.ini 扩展"php_pdo_mysql.dll"没开启

报错二
$ php artisan migrate
Migration table created successfully.

IlluminateDatabaseQueryException : SQLSTATE[42000]: Syntax error or access
violation: 1071 Specified key was too long; max key length is 767 bytes (SQL: a
lter table `users` add unique `users_email_unique`(`email`))

at D:WWWdev_omsvendorlaravelframeworksrcIlluminateDatabaseConnection.
php:664
660| // If an exception occurs when attempting to run a query, we'll
format the error
661| // message to include the bindings with SQL, which will make th
is exception a
662| // lot more helpful to the developer instead of just the databa
se's errors.
663| catch (Exception $e) {
> 664| throw new QueryException(
665| $query, $this->prepareBindings($bindings), $e
666| );
667| }
668|

Exception trace:

1 PDOException::("SQLSTATE[42000]: Syntax error or access violation: 1071 Sp
ecified key was too long; max key length is 767 bytes")
D:WWWdev_omsvendorlaravelframeworksrcIlluminateDatabaseConnection
.php:458

2 PDOStatement::execute()
D:WWWdev_omsvendorlaravelframeworksrcIlluminateDatabaseConnection
.php:458

Please use the argument -v to see more details.
数据库编码改为utf8mb4

报错三
$ php artisan migrate
Migration table created successfully.

IlluminateDatabaseQueryException : SQLSTATE[42000]: Syntax error or access
violation: 1071 Specified key was too long; max key length is 767 bytes (SQL: a
lter table `users` add unique `users_email_unique`(`email`))

at D:WWWdev_omsvendorlaravelframeworksrcIlluminateDatabaseConnection.
php:664
660| // If an exception occurs when attempting to run a query, we'll
format the error
661| // message to include the bindings with SQL, which will make th
is exception a
662| // lot more helpful to the developer instead of just the databa
se's errors.
663| catch (Exception $e) {
> 664| throw new QueryException(
665| $query, $this->prepareBindings($bindings), $e
666| );
667| }
668|

Exception trace:

1 PDOException::("SQLSTATE[42000]: Syntax error or access violation: 1071 Sp
ecified key was too long; max key length is 767 bytes")
D:WWWdev_omsvendorlaravelframeworksrcIlluminateDatabaseConnection
.php:458

2 PDOStatement::execute()
D:WWWdev_omsvendorlaravelframeworksrcIlluminateDatabaseConnection
.php:458

Please use the argument -v to see more details.
加上两行代码即可最后一句改成

 Schema::defaultStringLength(191);