doctrine / dbal-尝试将字符串字段更改为日期时出错

Question

我使用laraval迁移创建表。我将两个字段迁移为字符串。但我想要一个作为日期，一个作为整数。因此，我创建了一个用于更改这些字段的新迁移。我安装了教义/ dbal。我使用laravel 6.5。但是尝试迁移时出现错误。我的迁移是

/**
 * Run the migrations.
 *
 * @return void
 */
public function up()
{
    Schema::table('follow_up_task', function (Blueprint $table) {
        $table->date('next_follow_date')->change();
        $table->integer('follow_stop_after')->change();
    });
}

/**
 * Reverse the migrations.
 *
 * @return void
 */
public function down()
{
    Schema::table('follow_up_task', function (Blueprint $table) {
        $table->string('next_follow_date')->change();
        $table->string('follow_stop_after')->change();
    });
}

但是我有错误

  IlluminateDatabaseQueryException  : SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your mysql server version for the right syntax to use near 'CHARACTER SET utf8mb4 DEFAULT NULL COLLATE `utf8mb4_unicode_ci`, CHANGE recurrin' at line 1 (SQL: ALTER TABLE recurring_tasks CHANGE next_recurring_date next_recurring_date DATE CHARACTER SET utf8mb4 DEFAULT NULL COLLATE `utf8mb4_unicode_ci`, CHANGE recurring_stop_after recurring_stop_after INT CHARACTER SET utf8mb4 DEFAULT NULL COLLATE `utf8mb4_unicode_ci`)

at /home/vagrant/flowtopia-api/vendor/laravel/framework/src/Illuminate/Database/Connection.php:669
665|         // If an exception occurs when attempting to run a query, we'll format the error
666|         // message to include the bindings with SQL, which will make this exception a
667|         // lot more helpful to the developer instead of just the database's errors.
668|         catch (Exception $e) {
669|             throw new QueryException(
670|                 $query, $this->prepareBindings($bindings), $e
671|             );
672|         }
673| 

Exception trace:

1 Doctrine DBAL Driver PDOException：:(“ SQLSTATE [42000]：语法错误或访问冲突：1064您的SQL语法有错误；请查看与您的MySQL服务器版本相对应的手册，以获取正确的语法。在“ CHARACTER SET utf8mb4 DEFAULT NULL COLLATE utf8mb4_unicode_ci，CHANGE recurrin”第1行附近使用”）/home/vagrant/flowtopia-api/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php:63

2 PDOException：:(“ SQLSTATE [42000]：语法错误或访问冲突：1064您的SQL语法有错误；请查看与MySQL服务器版本相对应的手册，以获取在'CHARACTER SET utf8mb4附近使用的正确语法。默认为NULL COLLATE utf8mb4_unicode_ci，更改在第1行重复发生”）/home/vagrant/flowtopia-api/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php:61

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