如何在 laravel 迁移中更改主键

Question

我正在尝试更改表上的主键，以便我也可以使用其他列作为外键。

这是创建的迁移

public function up()
{
   Schema::create('blacklists', function (Blueprint $table) {
        $table->id();
        $table->integer('adv_id')->default(0);
        // ...other columns
   });
}

然后，我进行了另一个迁移以更改adv_id列类型以准备添加外键

public function up()
{
    Schema::table('blacklists', function(Blueprint $table){
         $table->integer('adv_id')->unsigned()->change();
    });
}

这是我有货的地方

public function up()
{
     Schema::table('blacklists', function(Blueprint $table) {
         $table->dropPrimary('id');
         $table->integer('adv_id')->primary()->change();
     });
}

当我运行最后一次迁移时，我收到了这个错误消息

Syntax error or access violation: 1075 Incorrect table definition; there can be only one auto column and it must be defined as a key (SQL: alter table `blacklists` drop primary key)

Answer 1

您可以尝试这样做，因为一次只允许一个自动增量。

public function up()
{
 Schema::table('blacklists', function (Blueprint $table) {
    $table->dropPrimary('id');
    $table->integer('adv_id')->unsigned()->change();
 });
}

Answer 2

这对我有用

public function up()
{
 Schema::table('blacklists', function (Blueprint $table) {
   $table->dropPrimary();
   $table->unsignedInteger('id')->change();
   $table->dropColumn('id');
   $table->uuid()->primary()->unique()->index()->first();
 });