问题
My preview works and has data but my deployment has no data. I'm using the (Recommended) DEFAULT CLOUD SQL database configuration.
Note: This is only day 4 with Google App Maker. Finding answers to App Maker-specific questions has been super difficult, but I'm making rapid progress on my application, so overall tired but good. :{)
回答1:
As written in the documentation,
App Maker deployments can use the same Cloud SQL instance, but have separate databases on that instance. Data that you had in preview mode is not available in other deployments. You have a few options for how to handle this situation:
To use data from the preview instance in your published deployment, export the deployment data from the preview instance and import it to the published deployment.
To share a database across all deployments (preview and published), use a custom Cloud SQL database.
回答2:
When you deploy your app, AppMaker create a new database in your google cloud SQL instance for the deployment. All the data create in previews is in another database.
To use the same database as the preview mode you have to go in the settings of your app in the tab "DATABASE" and copy the Database Key. Then go to your cloud sql instance in google cloud platforme and on the details of the instance in the overview tab just copy the instance connexion name. then edit your deployments and select "Use Custom Cloud SQL database" and copy with the format "instanceConnexionName/DatabaseKey" then save and appmaker should ask you to enter you username and password of your google cloud sql insatnce.
回答3:
On app settings, database page you should see
Databas key: iTIJQaCj491a4111 (Actually this is the name of the mySQL instance)
In GCP console, go to SQL, click on Instance ID, and on the Instance ID overview page is the instance connection name, e.g., MyProject-123456:us-central1:instancename
Back in app settings Select Switch to custom database and enter the full connection string projectname:instancename/schema as
MyProject-123456:us-central1:instancename/iTIJQaCj491a4111
Provide username and password and follow the steps to confirm existing database
回答4:
Turns out the issue is when you publish it doesn't push the data, you have to manually re-upload the data into the live version. This is actually a good thing, but I wish it'd been explicitly documented. I found it, after figuring it out on my own, in some early release notes from a few years back. I guess I wasn't the only one this stupid.
来源：https://stackoverflow.com/questions/55803032/why-does-my-deployment-have-no-data-but-my-preview-has-all-the-data