Question

我创建了这样的表：

$this->createTable('evenement', [
        'id' => $this->integer(),
        'description' => $this->string(),
        'status' => $this->smallInteger()->defaultValue(10),
        'start_datetime' => $this->integer()->notNull(),
        'end_datetime' => $this->integer()->notNull()
        'created_at' => $this->integer()->notNull(),
        'updated_at' => $this->integer()->notNull(),
        'created_by' => $this->integer(),
        'updated_by' => $this->integer(),
        ], $tableOptions);
  $this->createTable('event_participant', [
        'event_id' => $this->integer(),
        'user_id' => $this->integer(),
        'status' => $this->smallInteger()->defaultValue(10),
        ], $tableOptions);
    $this->addPrimaryKey('pk-event_participant', 'event_participant', ['event_id', 'user_id']);
    $this->addForeignKey('fk-user_id-event_participant', 'event_participant', 'user_id', 'user', 'id', 'no action');
    $this->addForeignKey('fk-event_id-event_participant', 'event_participant', 'event_id', 'evenement', 'id', 'CASCADE');

但我收到此错误，我不知道为什么？我做错了什么？

add foreign key fk-event_id-event_participant: event_participant (event_id) references evenement (id) ...Exception 'yii\db\Exception' with message 'SQLSTATE[HY000]: General error: 1215 Cannot add foreign key constraint
The SQL being executed was: ALTER TABLE `event_participant` ADD CONSTRAINT `fk-event_id-event_participant` FOREIGN KEY (`event_id`) REFERENCES `evenement` (`id`) ON DELETE CASCADE'

Answer 1

外键只能链接到主键或唯一键。

将PK或UK定义添加到evenement表

'id' => $this->primaryKey(),

或

'id' => $this->integer()->notNull()->unique(),

Yii2迁移一般错误：1215无法添加外键约束

1 个答案: