使用SQLite创建条目（Android）

Question

I have problem with my insert method while testing it by JUnit Android Test and no enrty is saved in the database :

public long save(TAV t) {
    ContentValues v = new ContentValues();
    v.put(TAV_TITRE, t.getTitle());
    v.put(TAV_DATE, t.getDate());
    v.put(TAV_DESCRIPTION, t.getDescription());
    return db.insert(TAV_TABLE, null, v);
}
//this is the JUnit Test Method 
public void testAddition() {
    setUp();
    TAV t = new TAV("titre", "date", "decsritpion");
    m.open();
    m.save(t);
    Log.i(tag, "insertion");
    testShowAll();
}

HELP PLEASE !!!

Answer 1

In your save() method, make sure you make an instance of your databse,something like SQLiteDatabase db = this.getWritableDatabase(); .And remove return from return db.insert(TAV_TABLE, null, v); ie use

public void save(TAV t) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues v = new ContentValues();
v.put(TAV_TITRE, t.getTitle());
v.put(TAV_DATE, t.getDate());
v.put(TAV_DESCRIPTION, t.getDescription());
db.insert(TAV_TABLE, null, v);
}

From the SQLiteDatabase Documents

public long insert (String table, String nullColumnHack, ContentValues values) Returns the row ID of the newly inserted row, or -1 if an error occurred

So if your purpose is just to add a row into your database then your method need not return anything.So you can just make return type of your method void and use db.insert inside.