it is the first time that I need to change database structure of my app (that has been already published on Google play). This is my database class:
public class Database extends SQLiteOpenHelper {
private static final String DB_NAME = "db";
private static final int DB_VERSION = 1;
public Database(Context context) {
super(context, DB_NAME, null, DB_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
String table = "CREATE TABLE users(";
table += "_id TEXT PRIMARY KEY,";
table += "name TEXT NOT NULL,";
table += "surname TEXT NOT NULL,";
table += "details TEXT);";
String table2 = "CREATE TABLE favorite(";
table2 += "id TEXT PRIMARY KEY);";
String table3 = "CREATE TABLE documents(";
table3 += "id TEXT PRIMARY KEY,";
table3 += "text TEXT NOT NULL,";
table3 += "username TEXT REFERENCES users(_id));";
String table4 = "CREATE TABLE average(";
table4 += "user TEXT PRIMARY KEY,";
table4 += "document INTEGER NOT NULL,";
table4 += "avg REAL NOT NULL);";
db.execSQL(table);
db.execSQL(table2);
db.execSQL(table3);
db.execSQL(table4);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
I have added the following table:
String table5 = "CREATE TABLE categories(";
table5 += "source TEXT PRIMARY KEY,";
table5 += "parent TEXT,";
table5 += "sub TEXT NOT NULL);";
and then add this:
db.execSQL(table5);
So now, what have i to add in onUpgrade method to make users have the updated database on their device? Sorry if it could be a dumb question, but I'm not sure to be able to do that and I want to feel safe about making users to get the right structure in the new version of the app.
