获取语​​法错误或访问冲突：1067 laravel 中 'deadline' 的默认值无效迁移

Question

我正在迁移 table:

<?php

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

class CreateExamsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('exams', function (Blueprint $table) {
            $table->id();
            $table->string('name');
            $table->enum('type',['iq','math','geo','gen']);
            $table->string('notes');
            $table->boolean('vip');
            $table->string('rate');
            $table->integer('hardness');
            $table->string('quode');
            $table->timestamp('bornline');
            $table->timestamp('deadline', $precision = '0000-00-00');
            $table->timestamps();
        });
    }

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

cmd 返回此错误

Illuminate\Database\QueryException

SQLSTATE[42000]: Syntax error or access violation: 1067 Invalid default value for 'deadline' (SQL: create table exams (id bigint unsigned not null auto_increment primary key, name varchar(191) not null, type enum('iq', 'math', 'geo', 'gen') not null, notes varchar(191) not null, vip tinyint(1) not null, rate varchar(191) not null, hardness int not null, quode varchar(191) not null, bornline timestamp not null, deadline timestamp not null, created_at timestamp null, updated_at timestamp null) default character set utf8mb4 collate 'utf8mb4_unicode_ci')

at C:\Users\xxgam\OneDrive\Desktop\projects\deneme\vendor\laravel\framework\src\Illuminate\Database\Connection.php:705
701▕ // If an exception occurs when attempting to run a query, we'll format the error
702▕ // message to include the bindings with SQL, which will make this exception a
703▕ // lot more helpful to the developer instead of just the database's errors.
704▕ catch (Exception $e) { ➜ 705▕ throw new QueryException(
706▕ $query, $this->prepareBindings($bindings), $e
707▕ );
708▕ }
709▕ }

C:\Users\xxgam\OneDrive\Desktop\projects\deneme\vendor\laravel\framework\src\Illuminate\Database\Connection.php:494 PDOException::("SQLSTATE[42000]: Syntax error or access violation: 1067 Invalid default value for 'deadline'")

C:\Users\xxgam\OneDrive\Desktop\projects\deneme\vendor\laravel\framework\src\Illuminate\Database\Connection.php:494 PDOStatement::execute()

Answer 1

小数秒精度 (fsp) 没有像 0000-00-00 这样的格式。 fsp 值，如果给定， 必须在 0 到 6.

范围内

使用 0000-00-00 格式，我相信您想为 deadline 列创建一个默认值。您可以使用 default() 方法：

$table->timestamp('deadline')->default('0000-00-00');

或nullable()方法，允许将NULL值输入到列中：

$table->timestamp('deadline')->nullable();