Fastest way to insert values to android sqlite database

Question

I want to create a database, and fill it at the start of application. It will remain same and will never change. There will be like 1000 entries. What is the good way to do this?

I created the table so far, but now i have to fill it with 1000 entries. Is there an UI for it?

public void onCreate(SQLiteDatabase db) {
            // TODO Auto-generated method stub
            db.execSQL("CREATE TABLE "+TABLE_NAME+" ("+
            UID+" INTEGER PRIMARY KEY AUTOINCREMENT, "+
            USER_NAME+" TEXT NOT NULL, "+
            USER_TYPE+" TEXT NOT NULL, "+
            USER_CLASS+" TEXT NOT NULL);"


        );

Answer 1

Several ways to improve the performance:

As Tsunaze suggests, you should do this in another thread, you can check AsyncTask which is the "default" tool provided in the SDK to do this.

---

Consider using transactions:

db.beginTransaction();
for(...){
    db.insert(...);
}
db.commit();

In this way you will only write to the database when you finish inserting all the values, speeding up the process.

---

Do massive inserts:

insert into table
select value1X, value1Y, value1Z
union all
select value2X, value2Y, value2Z
union all
select value3X, value3Y, value3Z
union all
select value4X, value4Y, value4Z

Answer 2

you can create file "table_inserts.sql" and put it in "raw" folder.

    private void insertValues(SQLiteDatabase db) {
        db.beginTransaction();
        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(context.getResources().openRawResource(R.raw.table_inserts))));
            String s;
            while ((s = reader.readLine()) != null) {
                db.execSQL(s);
            }
            reader.close();
        } catch (IOException ignored) {
        }
        db.setTransactionSuccessful();
        db.endTransaction();
    }

or your can write all inserts in code.

Answer 3

You need to do it in a thread, to no block the main UI:

public void addObjects(List<Object> objects, OnQueryListener listener){
listener.begin();
database.beginTransaction();
for(int i = 0; i < objects.size();i++{
// Add
}
database.setTransactionSuccessful();
database.endTransaction();
listener.end();
}

private interface OnQueryListener{
void begin();
void end();
}

And in your main Code do something like this :

Handler h = new Handler();
Thread t = new Thread(run);
t.start();

Runnable run = new Runnable{

void run(){
addObjects(objects, new OnQueryListener{

void begin(){

}
void end(){
handler.post(new Runnable{
void run(){
// On your main UI
}
}
}
}
}
}

It's not something i've tested on real code, just something at the top of my head.