升级现有的预加载sqlite数据库

Question

I want to upgrade my existing database. I have imported a preloaded database(stored in assets folder) which is created using Sqlite manager. So previously it has 4 Tables (eg Table A , B , C , D ),and I want to do the following operations

• I want to add columns in table A
• I want to add a new table E
• I want to add some extra data in table B

Note: I have already created a database using Sqlite manager and added extra data also in table B .

My question is how to upgrade the database for existing user ?

my code is for adding a column is as below :

@Override
public void onUpgrade(SQLiteDatabase database, int version_old,
            int current_version) {

    if(version_old == 1){
        mySqliteDb.execSQL("ALTER TABLE A ADD columnName TEXT ");
    }
}

So basically I am stuck in 2nd and 3rd problem.

There are few same type of question I found here , however what I need is an example. Thank you.

Answer 1

对于表E，您只需要创建一个create table语句，对于表B，您需要一个insert语句，而无需用where填充现有列。