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There is lot of stuff available on the internet on how to use singleton pattern for sqlite in android, my question is why use singleton pattern to communicate with sqlite database
Using a singleton class to manage access to your database can help developers avoid the mistake of leaking database instances (i.e. opening but not closing database instances).
This approach, and the problem is solves, is described nicely in this post: https://www.androiddesignpatterns.com/2012/05/correctly-managing-your-sqlite-database.html.
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I have an android app that constantly inputs data on a database (sqlite).
every 3 or 6 seconds (sometime is less than that) I insert data into the DB.
I created a DatabaseHelper (SQLiteOpenHelper) object which does that but I've been wondering if its better to close and create a new DatabaseHelper object each time I input data or if its better to keep it open?
It's better to use a single connection throughout your whole app, it's explanied here.
Also you could use ORM Lite.
But keep in mind that you should use ROOM, from Android documentation:
We highly recommended using the Room Persistence Library as an
abstraction layer for accessing information in your app's SQLite
databases.
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I want to make a database with 2 columns: name and age. Should I use a Content Provider for this?
"You don't need to develop your own provider if you don't intend to share your data with other applications."
Otherwise, I'd use SQLite directly with SQLiteOpenHelper.
Only if you want other apps to access this data. That's the purpose of a ContentProvider. If you want to use it internally, just access the database.
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how to join in android database sqlite
this is how I usually select and join between two or more different tables :
SELECT master_spaj._id,master_spaj.SPAJ_ID,pemegang_polis.nama_pp,table_tertanggung.nama_tt,master_spaj.IdProposal FROM master_spaj,pemegang_polis,table_tertanggung WHERE master_spaj.SPAJ_ID=pemegang_polis.SPAJ_ID AND master_spaj.SPAJ_ID=table_tertanggung.SPAJ_ID
Used queries to URL conversions.
OData v4 introduces a new operators, which may resolve your scenario.
For more please reference this:http://docs.oasis-open.org/odata/odata/v4.0/odata-v4.0-part2-url-conventions.html,
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I read at the Android documentation, and the "sqlite helper" is crazy complicated! Is there a way to not use it and maybe use standard sql commands instead? I come from the php mysql, that's my reference; I took a look at the php sqlite too and it also looks much easier.
UPDATE
Thanks soulreaver! Now, another question:
When would I want to use the sqlite helper ? what are the benefits ?
You can always use raw SQLite queries RawQuery. I can agree that sometimes for simple tasks using SQLiteOpenHelper doesn't help at all (It is usable for more complicated things though).
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So how di I manage a Android database which isn't even located in the assets folder. I followed this tutorial, and it's great, but what if I want to delete and add information to tables manually?
http://www.java2s.com/Code/Android/Database/Createdeleteupdate.htm
You can use other software to modify you Database simply by opening the assets file with that software.
Here is SQLite Expert that is recommended for modifying your Database