SQLSTATE [42000]：语法错误或访问冲突：1068 定义了多个主键

Question

我正在尝试将我的应用程序切换为使用 Uuid，但我的迁移在事件表上失败。

SQLSTATE[42000]：语法错误或访问冲突：1068 定义了多个主键（SQL：alter table events add primary key events_id_primary(id)）

Schema::create('events', function (Blueprint $table) {
        $table->uuid('id')->primary();
        $table->string('title', 255);
        $table->integer('join_id', 6)->unique();
        $table->string('image')->nullable();
        $table->string('location')->nullable();
        $table->text('description')->nullable();
        $table->timestamp('event_date')->nullable();
        $table->timestamp('event_time')->nullable();
        $table->foreignUuid('user_id')->nullable()->index();
        $table->foreign('user_id')
            ->references('id')
            ->on('users')
            ->onDelete('cascade');
        $table->softDeletes();
        $table->timestamps();
    });


Schema::create('users', function (Blueprint $table) {
        $table->uuid('id')->primary();
        $table->string('name')->nullable();
        $table->string('email')->unique();
        $table->string('username')->nullable();
        $table->string('avatar')->nullable();
        $table->string('phone_number')->nullable();
        $table->timestamp('email_verified_at')->nullable();
        $table->string('password');
        $table->rememberToken();
        $table->timestamps();
    });

非常感谢任何帮助！

Answer 1

当您查看integer() 的文档时，您会发现第二个参数不是用于大小，而是用于字段的自动增量/主。整数类型本身就是一个大小（tinyInteger、smallInteger、bigInteger，...）。而6 变成布尔值返回 true。

/**
     * Create a new integer (4-byte) column on the table.
     *
     * @param  string  $column
     * @param  bool  $autoIncrement
     * @param  bool  $unsigned
     * @return \Illuminate\Database\Schema\ColumnDefinition
     */
    public function integer($column, $autoIncrement = false, $unsigned = false)
    {
        return $this->addColumn('integer', $column, compact('autoIncrement', 'unsigned'));
    }

你只需要删除那个 6

Schema::create('events', function (Blueprint $table) {
        $table->uuid('id')->primary();
        $table->string('title', 255);
        $table->integer('join_id')->unique();
        $table->string('image')->nullable();
        $table->string('location')->nullable();
        $table->text('description')->nullable();
        $table->timestamp('event_date')->nullable();
        $table->timestamp('event_time')->nullable();
        $table->foreignUuid('user_id')->nullable()->index();
        $table->foreign('user_id')
            ->references('id')
            ->on('users')
            ->onDelete('cascade');
        $table->softDeletes();
        $table->timestamps();
    });