AppSheet can build apps from Oracle databases hosted in Oracle Cloud, Amazon RDS, or other cloud hosting provider that supports Oracle.
To use data from Oracle in your app, you must first add an Oracle data source to your account. To do so, go to the account page, open the Data Sources tab, and click on the add new data source button.
When prompted, name your new data source and select Database.
Fill out the connection information of your Oracle database, test the connection, and authorize AppSheet to use data from the data source.
If you don't specify any port number with the server address, AppSheet will assume the database uses the default port 1521; if a different port is used, it must be included in the server address. Below is an example of a server address with port number 8000:
In order for AppSheet to access the database, the Oracle instance must be hosted in the cloud (Oracle Cloud, Amazon RDS, or other cloud hosting provider), and both the network and the Oracle instance must accept inbound connections to the database from AppSheet servers. Please refer to Managing IP Address and Firewall Information for further information.
Once an Oracle data source has been added to your account, you can add tables or views in the data source to any app. When you choose Add Table in the app editor, you can select the specific data source, and a table or view from that data source.
Once added to the app, AppSheet treats all data sources similarly. In fact, it's common and natural to combine data from an Oracle data source with data from other sources in the same app.
Using Oracle on Amazon RDS
If your database is running on AWS, ensure that Network Security option Publicly Accessible is set to Yes. Then create inbound rules to accept all traffic from AppSheet's IP addresses, which can be found in Managing IP Address and Firewall Information.
Working with Identity Columns
Starting with Oracle Database 12c release 1 (12.1), Oracle tables can use IDENTITY columns as key columns. The values of an IDENTITY column are auto-incrementing numbers that get automatically inserted by the database.
Oracle tables with IDENTITY columns can pose a problem when used in AppSheet. By default, SQL doesn't let an application define the IDENTITY column value. However, with AppSheet, new rows are created in the app when it's potentially offline and may only be synced later, so the app needs to be able to assign key/IDENTITY values.
The best solution is to avoid IDENTITY column keys altogether in your database schema. Instead, use a column that is an NVARCHAR2(8) (or in general an NVARCHAR of length greater than or equal to 8). In AppSheet's column definition for this key, give it an initial value of UNIQUEID(). Now unique key values can be assigned by the app and inserted into the backend database.
If the database must use IDENTITY columns, it's preferable to create them with a large initial seed. For example, use START WITH 100000 to set the initial value of the column to 100000. In AppSheet's column definition for this key, give it an initial value of RANDBETWEEN(10000, 99999). Now any records created from your app will have five digit values that lie randomly in the range 10000 to 99999, while records created directly against the database will have higher values.
If the database schema cannot be changed and if there is already an IDENTITY column being used with the default initial seed (of 1), we recommend you follow the same approach as described earlier. However, you can first manually increment the IDENTITY seed as follows:
ALTER TABLE tablename MODIFY (columnName GENERATED START WITH 100000)
This should "re-seed" the IDENTITY column to the desired range. Your AppSheet app will insert values in the range specified by the RANDBETWEEN() function in the initial value of your AppSheet column definition.
Saving Files Created in the App
Database servers differ from the rest of our cloud storage providers in that they do not have a file system. This leads to a change in AppSheet behavior when saving files (like images and documents). If the app has to capture photographs, they're normally stored in a folder next to the source of data in cloud storage. However, in the case of an Oracle table, image and document files are stored in the main cloud file system associated with the app creator's primary AppSheet account (typically Google Drive/Dropbox/Office 365/Box). The files will be saved in a subfolder of your account's default folder path (usually /appsheet/data). You can view and change the default folder path in your account page under the Settings tab.