Android Question Simple 2 SQlite example (by Klaus)

Beja

Beja

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This is about the second example with more functions.

1- First run just after installation is ok
2- next run (run 2) brings exception
LogCat connected to: emulator-5554
** Activity (main) Create, isFirst = true **


** Activity (main) Resume **
ExecuteHtml: SELECT ID, FirstName As [First name], LastName As [Last name], City FROM persons
** Activity (main) Pause, UserClosed = false **
** Activity (edit) Create, isFirst = true **
** Activity (edit) Resume **
** Activity (edit) Pause, UserClosed = true **
** Activity (main) Resume **
ExecuteHtml: SELECT ID, FirstName As [First name], LastName As [Last name], City FROM persons
** Activity (main) Pause, UserClosed = false **
** Activity (edit) Create, isFirst = false **
** Activity (edit) Resume **
** Activity (edit) Pause, UserClosed = true **
** Activity (main) Resume **
ExecuteHtml: SELECT ID, FirstName As [First name], LastName As [Last name], City FROM persons
** Activity (main) Pause, UserClosed = true **
** Activity (main) Create, isFirst = false **
** Activity (main) Resume **
java.lang.IllegalStateException: database not open
at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1333)
at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1315)
at anywheresoftware.b4a.sql.SQL.ExecQuery2(SQL.java:167)
at anywheresoftware.b4a.sql.SQL.ExecQuery(SQL.java:155)
at b4a.sqlitelight2.main._executehtml(main.java:384)
at b4a.sqlitelight2.main._showtable(main.java:573)
at b4a.sqlitelight2.main._activity_resume(main.java:327)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:174)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:158)
at b4a.sqlitelight2.main.afterFirstLayout(main.java:104)
at b4a.sqlitelight2.main.access$100(main.java:16)
at b4a.sqlitelight2.main$WaitForLayout.run(main.java:76)
at android.os.Handler.handleCallback(Handler.java:587)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4627)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)
java.lang.IllegalStateException: database not open

Note:
after the exception I have two options: Continue, yes or no
If I chose yes, database is blank, and next run will be the same error
If I chose No, it will exit the App, but next run the data is there but any editing or added records are lost


Note: no modification.
 
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Beja

Beja

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Sorry, Beja, what means "with more functions"?
Click to expand...

Thanks LukaMs, this is how Klaus described it "with more functions" (check Klaus signature and follow the link)
 
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LucaMs

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Maybe I was right about a question that I made with regard to the "exits" from the activities (without use Activity.Finish); I think is possible that a dirty queue remains open.

I think so, because, adding:
ExitApplication

in the Activity_Pause, the app has no problems.
 
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Beja

Beja

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In fact I didn't touch the code, that was a quick run to see.. but I think one of the activities (that you visit, like Add) is not closing. Will also check.
 
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LucaMs

LucaMs

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No, If I only add Activity.Finish in ever Activity but don't add ExitApplication, I get the error.

I confirm that adding ExitApplication, the app works well.

For some reason, isFirst is False; this means that the app is running, whithout use ExitApplication
 
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Beja

Beja

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Yeah,
Now working fine.. but edit and add are not saving.. when you close and open again, the original db comes up.
 
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LucaMs

LucaMs

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Yes, but that is because of design choice, because it is an example.
You should delete:
B4X: 
        File.Delete(File.DirInternal, "persons.db") ' only for testing, removes the database

I found that the app is still running (isFirst remains False) because of the WebView.

I have tested it in an empty project and this error remains.

[EDIT] It is normal behavior when you close the Main via the hardware Back button, so it is not inherent to the WebView.
 
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Beja

Beja

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Thanks LucaMS, but I don't know how to save and update the table..
 
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LucaMs

LucaMs

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B4X: 
    If FirstTime Then
'        File.Delete(File.DirInternal, "persons.db") ' only for testing, removes the database

B4X: 
Sub Activity_Pause (UserClosed As Boolean)
    If UserClosed Then
        ExitApplication
    End If
End Sub

These two changes are sufficient.

Obviously, you should start the Activity for the editing pressing [Edit] and save pressing [Update]
 
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klaus

klaus

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Sorry for answering somewhat late, but I had no internet connection for two days.

Add the three lines below at the beginning of Activity_Resume.
B4X: 
Sub Activity_Resume
    If SQL1.IsInitialized = False Then
        SQL1.Initialize(File.DirInternal, "persons.db", True)
    End If
The first post in SQLiteLight has been updated.
 
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Beja

Beja

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Thanks Klaus,
I downloaded the updated version..
I want to edit the table to add 3 more fields (state, zip and phone) but didn't know how to do that.
Any hint appreciated.
 
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