Android -- Sqlite事务

public PersonSQLite(Context context) {
        super(context, "person.db", null, 2);
        // TODO 自动生成的构造函数存根
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO 自动生成的方法存根
        System.out.println("数据库发生了变化！！");
        db.execSQL("alter table person add account varchar(20)");
    }

public long addMoney(String name ,String number,int money)
    {
        SQLiteDatabase db = sqlite.getWritableDatabase();
        //db.execSQL("insert into person (name,number) values (?,?)", new Object[]{name,number});
        ContentValues values = new ContentValues();
        values.put("name", name);
        values.put("number", number);
        values.put("account", money);
        long id = db.insert("person", null, values);
        db.close();
        return id;
    }

//先添加数据
    public void testAddMoney()
    {
        PersonDao2 dao = new PersonDao2(getContext());
        dao.addMoney("wangwu", "123", 5000);
        dao.addMoney("zhangsan", "321", 2000);
    }
    //事务处理
    public void testTransaction()
    {
        PersonSQLite sqlite = new PersonSQLite(getContext());
        SQLiteDatabase db = sqlite.getWritableDatabase();
        db.beginTransaction();
        db.execSQL("update person set account=account-1000 where name = ?",new Object[]{"zhangsan"});
        db.execSQL("update person set account=account+1000 where name = ?",new Object[]{"wangwu"});
        db.endTransaction();
        db.close();
    }