php - Laravel 迁移，hasColumn 方法失败

Question

我使用的是 Laravel 5.2 版本和 PHP 7.1。我正在尝试从我的 laravel 项目迁移文件，其中我有代码来检查列是否存在，如下所示 -

if (!Schema::hasColumn('table1', 'column1')) {
    // Add column1
}

我知道代码非常好，并且在设置相同的代码时已经工作了好几次。但现在我在单独的机器上尝试这个并失败并出现错误 -

[ErrorException]
Undefined property: stdClass::$column_name

如果我从代码中删除 hasColumn 检查，我可以摆脱这个错误，但这是我在整个代码中编写的内容，不能仅仅为了运行迁移而修改每个迁移。

非常感谢对此的任何帮助。

堆栈跟踪:

[ErrorException]
Undefined property: stdClass::$column_name

Exception trace: () at /private/var/www/html/whitelabel_eb/vendor/laravel/framework/src/Illuminate/Database/Query/Processors/MySqlProcessor.php:18 Illuminate\Foundation\Bootstrap\HandleExceptions->handleError() at /private/var/www/html/whitelabel_eb/vendor/laravel/framework/src/Illuminate/Database/Query/Processors/MySqlProcessor.php:18 Illuminate\Database\Query\Processors\MySqlProcessor->Illuminate\Database\Query\Processors{closure}() at n/a:n/a array_map() at /private/var/www/html/whitelabel_eb/vendor/laravel/framework/src/Illuminate/Database/Query/Processors/MySqlProcessor.php:21 Illuminate\Database\Query\Processors\MySqlProcessor->processColumnListing() at /private/var/www/html/whitelabel_eb/vendor/laravel/framework/src/Illuminate/Database/Schema/MySqlBuilder.php:40 Illuminate\Database\Schema\MySqlBuilder->getColumnListing() at /private/var/www/html/whitelabel_eb/vendor/laravel/framework/src/Illuminate/Database/Schema/Builder.php:69 Illuminate\Database\Schema\Builder->hasColumn() at /private/var/www/html/whitelabel_eb/vendor/laravel/framework/src/Illuminate/Support/Facades/Facade.php:217 Illuminate\Support\Facades\Facade::__callStatic() at /private/var/www/html/whitelabel_eb/database/migrations/2017_07_28_053158_add_columns_to_project_configurations_table.php:16 AddColumnsToProjectConfigurationsTable->{closure}() at /private/var/www/html/whitelabel_eb/vendor/laravel/framework/src/Illuminate/Database/Schema/Blueprint.php:69 Illuminate\Database\Schema\Blueprint->__construct() at /private/var/www/html/whitelabel_eb/vendor/laravel/framework/src/Illuminate/Database/Schema/Builder.php:207 Illuminate\Database\Schema\Builder->createBlueprint() at /private/var/www/html/whitelabel_eb/vendor/laravel/framework/src/Illuminate/Database/Schema/Builder.php:116 Illuminate\Database\Schema\Builder->table() at /private/var/www/html/whitelabel_eb/vendor/laravel/framework/src/Illuminate/Support/Facades/Facade.php:217 Illuminate\Support\Facades\Facade::__callStatic() at /private/var/www/html/whitelabel_eb/database/migrations/2017_07_28_053158_add_columns_to_project_configurations_table.php:103 AddColumnsToProjectConfigurationsTable->up() at /private/var/www/html/whitelabel_eb/vendor/laravel/framework/src/Illuminate/Database/Migrations/Migrator.php:135 Illuminate\Database\Migrations\Migrator->runUp() at /private/var/www/html/whitelabel_eb/vendor/laravel/framework/src/Illuminate/Database/Migrations/Migrator.php:112 Illuminate\Database\Migrations\Migrator->runMigrationList() at /private/var/www/html/whitelabel_eb/vendor/laravel/framework/src/Illuminate/Database/Migrations/Migrator.php:85 Illuminate\Database\Migrations\Migrator->run() at /private/var/www/html/whitelabel_eb/vendor/laravel/framework/src/Illuminate/Database/Console/Migrations/MigrateCommand.php:74 Illuminate\Database\Console\Migrations\MigrateCommand->fire() at n/a:n/a call_user_func_array() at /private/var/www/html/whitelabel_eb/vendor/laravel/framework/src/Illuminate/Container/Container.php:507 Illuminate\Container\Container->call() at /private/var/www/html/whitelabel_eb/vendor/laravel/framework/src/Illuminate/Console/Command.php:150 Illuminate\Console\Command->execute() at /private/var/www/html/whitelabel_eb/vendor/symfony/console/Command/Command.php:238 Symfony\Component\Console\Command\Command->run() at /private/var/www/html/whitelabel_eb/vendor/laravel/framework/src/Illuminate/Console/Command.php:136 Illuminate\Console\Command->run() at /private/var/www/html/whitelabel_eb/vendor/symfony/console/Application.php:840 Symfony\Component\Console\Application->doRunCommand() at /private/var/www/html/whitelabel_eb/vendor/symfony/console/Application.php:190 Symfony\Component\Console\Application->doRun() at /private/var/www/html/whitelabel_eb/vendor/symfony/console/Application.php:114 Symfony\Component\Console\Application->run() at /private/var/www/html/whitelabel_eb/vendor/laravel/framework/src/Illuminate/Foundation/Console/Kernel.php:107 Illuminate\Foundation\Console\Kernel->handle() at /private/var/www/html/whitelabel_eb/artisan:35

Answer 1

我做了以下更改来解决此问题。 转到以下路径:/vendor/laravel/framework/src/Illuminate/Database/Query/Processors/MySqlProcessor.php

改变这个， return $r->column_name; 第 18 行 到 返回$r->COLUMN_NAME;