如何在Laravel中执行查询前检查列

use Illuminate\Support\Facades\Schema;

if (Schema::hasColumn('table_name', 'column_name')) {
    // 列存在，可以执行查询操作
} else {
    // 列不存在，执行相应的处理逻辑
}

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class AddColumnToTable extends Migration
{
    public function up()
    {
        Schema::table('table_name', function (Blueprint $table) {
            if (!Schema::hasColumn('table_name', 'column_name')) {
                $table->string('column_name');
            }
        });
    }

    public function down()
    {
        Schema::table('table_name', function (Blueprint $table) {
            if (Schema::hasColumn('table_name', 'column_name')) {
                $table->dropColumn('column_name');
            }
        });
    }
}