php cakephp 更新字段
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cakephp Update field
提问by aWebDeveloper
How do i force cake to update a field and not insert a new record.
我如何强制蛋糕更新字段而不是插入新记录。
It should fail if the id does not exist in the db
如果 id 不存在于数据库中，它应该会失败
I found to force a insertion i can do 'updated' => falseso if i do 'updated' => truewill it work
我发现强制插入我可以这样做'updated' => false，如果我这样做'updated' => true会起作用吗
回答by JohnP
If you want to just update a field, use the saveFieldmethod of the model
如果你只想更新一个字段，使用saveField模型的方法
$this->Order->id = $id;
$this->Order->saveField('status', 'VOID');
Reference : http://book.cakephp.org/2.0/en/models/saving-your-data.html
参考：http: //book.cakephp.org/2.0/en/models/saving-your-data.html
回答by Orbit
//Create: id isn't set or is null
$this->Recipe->create();
$this->Recipe->save($this->data);
//Update: id is set to a numerical value
$this->Recipe->id = 2;
$this->Recipe->save($this->data);
see http://book.cakephp.org/2.0/en/models/saving-your-data.html
见http://book.cakephp.org/2.0/en/models/saving-your-data.html
回答by AD7six
Use Model::exists
使用模型::存在
To ensure that the record does exist, use Model::Exists. For example:
要确保记录确实存在，请使用Model::Exists。例如：
function updateFoo($id, $value) {
if (!$this->exists($id) {
return false;
}
$this->id = $id;
return $this->saveField('foo', $value);
}
This would act like so:
这会像这样：
$false = $model->updateFoo(false, $value);
$false = $model->updateFoo(0, $value);
$false = $model->updateFoo('doesnotexist', $value);
$true = $model->updateFoo('doesexist', $value);
