call_user_func_array（）期望参数1是有效的回调，类'Illuminate \ Database \ MySqlConnection'没有方法'query'

Question

///迁移此文件时出现上面的错误

<?php

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

class SubjectOrderForExam extends Migration {

    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('subjectOrderingForExam', function(Blueprint $table)
        {
            $table->integer('id', true);
            $table->integer('subjectId');
            $table->integer('classId');
            $table->integer('sectionId');
            $table->string('subjectName', 255);
            $table->integer('orderingNo');
            $table->enum('isDelete', ['0','1'])->default('0');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::drop('subjectOrderingForExam');
    }

}

Answer 1

也许您没有为此使用所有必需的名称空间。

作为示例，在我的laravel 6项目之一中，我在开始时包括以下内容（请注意Schema ns）：

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