Local storage and offline

Question 1

How can you create a local copy of xerver side entities?

Answer 1

Right click on Local Storage and select “Add Entity from DB…”

Question 2

What are the restrictions on local entities?

Answer 2

• No data preview available

- Can’t be bootstrapped

Question 3

How can I secure small amounts of sensitive data in the local storage?

Answer 3

• Use the device’s Keystore/Keychain with the Keystore Plugin from the forge, then the encryption is done by the device itself
• Use a Javascript encryption frameto encrypt data before storing it. Then youn still need to secure the encryption ke, this can be done using the keystore

Question 4

How can I secure large amounts of sensitive data in the local storage?

Answer 4

• Encrypt the whole local storage with the Ciphered Local Storage Plugin
• Then you have a performance overhead

Question 5

What Sync Actions are available wnd where are they?

Answer 5

The Synvc actions can be found in the Logic Tabs's folders Client/Server actions.
Client Actions:
-OfflineDataSync
-OfflineDataSyncConfiguration
-TriggerOfflineDataSync
Server Actions:
-ServerDataSync

Question 6

What is the content of the offline data sync event block?

Answer 6

Actions:
-On Configure
-On Sync
-Trigger OnSyncStart/Error/Complete
Events
-OnSyncStart/Error/Complete

Question 7

How can I react to a Network Status Change?

Answer 7

There is a Network Status Changed block with event which is part of the MobilePatterns/Private Section

Question 8

When could you do offline data sync?

Answer 8

• OnLogin
• OnOnline
• OnResume

Question 9

What are the OfflineDataSync Config variables? What are their default settings?

Answer 9

• SyncOnOnline False
• SyncOnLogin False
• SyncvOnResume False
• SyncOnError False
• RetryIntervalInSeconds 30

Question 10

How is the OfflineDataSync called in the TriggerOfflineDataSync Routine and what are the parameters?

Answer 10

It is an action from the SILKUI private block which will start the sync to run in background. The parameters are:
SyncUnit
-DiscardPendingSyncUnit

Question 11

What are the typical Sync patterns?

Answer 11

-Read Only Data
Read Only Data - Optimized
-Read Write Data - Last write wins
-Read Write Data - With Conflict Detection

Question 12

What buttons/functions are available while debugging?

Answer 12

• Step over
• Step into
• Step Out
• Break on all Exceptions

Question 13

How are watches used in debugger?

Answer 13

Right click on variables, their content is then listed and updated in the watches tab of the debugger

Question 14

How is an exception handler selected?

Answer 14

OS always chooses the most specific one. If no handler applies in current context OS bubbkles up until arriving at the GlobalException handler

Question 15

Where can the global exception handler be configured?

Answer 15

In the Onexception action in Folder Common of UI Flow

Question 16

What properties of an Exception Handler can be configured?

Answer 16

-Abort transaction
If true, it rolls back all DB changes which were made so far by the process which raiosed the exception. Is only available on server side/server actions.
-Log Error
Defines if the error should be logged in the OS platform logs. If configured for Client side actions, the logs will be synced as soon as the user is online

Question 17

-What is available in the monitoring for the App?

Answer 17

Details About:

• Error Logs
• Database query durations
• Web service cvalls

Question 18

Where can monitoring be accessed?

Answer 18

In the monitoring tab of OS Servicecenter under myName.outsuystemscloud.com/servicecenter

Question 19

Can I refresh an aggregate in a Client action?

Answer 19

No, Aggregates can only be refreshed in screen action

Question 20

Assume data is fetched in a screen action by an aggregate, how can I refresh the agrregate after updating the corresponding entities?

Answer 20

You can only refresh screen aggregates in a client action. The only way ist to call another aggregate to obtain the modified data.

Question 21

Can I use functions in an aggregate, e.g. to calculate data in a calculated attribute?

Answer 21

Yes, you can. Even self programmed User functions. But you can not pass the data which should be fetched as an input to it.

Question 22

If you bootstrap data from a sheest of an excel with several sheets, what will be the name of the table?

Answer 22

The name of the selected sheet.

Question 23

If you perform an advanced SQL query, what is the correct structure?

• SELECT * FROM Entity.Name
• SELECT * FROM [Entity].{Name}
• SELECT * FROM {Entit}.[Name]

Answer 23

SELECT * FROM [Entity].{Name}