java - Saving ArrayList in SQLite database in Android

Question

I've been working with SQLite on android and I would like to add an arraylist to a column in a table, and then fetch the data back as an arraylist. The arraylist is a list of Longs. I've noticed that SQL has an option for storing BLOBS, however it looks like I need to convert the arraylist to a byte[] first before being able to store it as a blob in my SQLite database.

If anyone has a solution on how to save arraylists into an SQLite database that would be greatly appreciated. Or is there any other option for saving my array of data, i should consider?

Answer 1

To Insert :

ArrayList<String> inputArray=new ArrayList<String>();

//....Add Values to inputArray

Gson gson = new Gson();

String inputString= gson.toJson(inputArray);

System.out.println("inputString= " + inputString);

use "inputString" to save the value of ArrayList in SQLite Database

To retreive:

Get the String from the SQLiteDatabse what you saved and changed into ArrayList type like below: outputarray is a String which is get from SQLiteDatabase for this example.

Type type = new TypeToken<ArrayList<String>>() {}.getType();

ArrayList<String> finalOutputString = gson.fromJson(outputarray, type);

• In SQLite use text as format to store the string Value.....