How to update an SQLite Database and NOT lose all existing data?

Question

I\'m adding a table to my app\'s SQLite DB. All my syntax there is fine, not the issue. But I\'m having some trouble getting the new table to be created properly. I added the ne

Answer 1

if DB version : 6

Ex : There is a table with 5 columns

When you upgrade to : 7 ( I am adding 1 new column in the 3 tables)

 1. We need to add the columns when creating a table

 2. onUpgrade method:

 if (oldVersion < 7) 
 { 
    db.execSQL(DATABASE_ALTER_ADD_PAPER_PAID);
    db.execSQL(DATABASE_ALTER_LAST_UPLOADED);
    db.execSQL(DATABASE_ALTER_PAPER_LABEL); 
 }

Where : "DATABASE_ALTER_ADD_PAPER_PAID" is query.

EX: public static final String DATABASE_ALTER_ADD_PAPER_PAID = "ALTER TABLE "
                + TableConstants.MY_PAPERS_TABLE + " ADD COLUMN " + COLUMN_PAPER_PAID + " TEXT;";

After above two operation it will works fine for the fresh install user and app upgrade user