[英]MySQL delete and remove from many-to-many table in one transaction
Is it possible to delete from association table (many-to-many) and insert same row to it in the same transaction? 是否可以从关联表中删除(多对多)并将同一行插入同一事务中?
This is my association table: 这是我的关联表:
CREATE TABLE image_tag (
imageid bigint(19) NOT NULL,
tagid bigint(19) NOT NULL,
PRIMARY KEY (imageid, tagid));
ALTER TABLE image_tag ADD INDEX FKimage_tag587679 (tagid), ADD CONSTRAINT FKimage_tag587679 FOREIGN KEY (tagid) REFERENCES tag (id);
ALTER TABLE image_tag ADD INDEX FKimage_tag426448 (imageid), ADD CONSTRAINT FKimage_tag426448 FOREIGN KEY (imageid) REFERENCES image (id);
When I am creating a new image and inserting into image, insert into tag and insert into image_tag in one transaction, everything works. 当我创建一个新图像并插入到图像中时,在一个事务中插入到tag并插入到image_tag,一切正常。
The problem occurs when I want to to update Image and I: 当我想更新Image时出现问题,我:
Exception: 例外:
Cannot add or update a child row: a foreign key constraint fails (`mydatabase`.`image_tag`, CONSTRAINT `FKimage_tag426448` FOREIGN KEY (`imageid`) REFERENCES `image` (`id`))
Data: 数据:
Original data: (194, 123), (194, 225), (194, 291)
New data: (194, 123), (194, 225), (194, 65)
Source code (in PHP): 源代码(在PHP中):
if ($editation) {
if ($values->image->isOk()) {
$url = $img->load($values->id)->getUrl();
$values->image->move($this->wwwDir . "/" . $url);
} else {
$url = null;
}
$img->update($values->name, $values->descr, $url, null, $featured);
} else {
$uname = $img->createUniqueName($values->name);
$url = ImageManager::PATH . "/" . $uname . ".svg";
$values->image->move($this->wwwDir . "/" . $url);
$img->create($userId, $values->name, $url, $values->descr, null, $featured);
}
// Delete old image-tag associations if any
$this->db->query('DELETE FROM image_tag WHERE imageid = %i', $img->getId());
// Save tags and assign them to image
$tagIds = $this->tagManager->saveTags($values->tags);
$assoc = (new Dao\ImageTag())->setDb($this->db);
//throw new \Exception(implode(",", $tagIds));
foreach ($tagIds as $tagId) {
// EXCEPTION IS THROWED HERE (but only after editation)
$assoc->create($img->getId(), $tagId);
}
Don't you try to update your image_tag with invalid id? 您不尝试使用无效ID更新您的image_tag吗? ..null, 0, -1 or something else?
..null,0,-1还是其他?
Look to your code. 查看您的代码。 I suppose $img and $values->image are not the same, but you load $img only when $values->image is provided.
我想$ img和$ values-> image是不一样的,但是只有在提供$ values-> image时才加载$ img。 However, you try to update image_tag every time.
但是,您尝试每次更新image_tag。
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