Question

I want to update a record in my SQLite DB. This record is stored in a table with fields described by annotation @DatabaseField(canBeNull = false). Firstly I store a record, I fill all required values and later I try to update it.
I want to update only some values of record. For example:

Order o = new Order();
o.setStatus(OrderStatus.PENDING);
o.setIdOrder(1);

orderDAO.update(order);

I use update method of RuntimeExceptionDao. It constructs full update query with all columns.

For example:

UPDATE `order` SET `idCustomer` = ?, `number` = ?, `orderDate` = ?, `status` = ? WHERE `idOrder` = ?

And it throws me the exception

java.lang.RuntimeException: java.sql.SQLException: Unable to run update stmt on object Order

How can I specify fields for UPDATE query? I want only this query

UPDATE `order` SET `status` = ? WHERE `idOrder` = ?

Answer 1

By default dao.update(...) updates all fields. It doesn’t know that you’ve only changed a couple of them or anything.

Typically you request the item from the database, change it and call dao.update(...):

Order order = orderDao.queryForId(1);
if (order.getStatus() != OrderStatus.PENDING) {
   order.setStatus(OrderStatus.PENDING);
   orderDao.update(order);
}

This allows you to test the current Order status, etc.. If you must create a custom UPDATE method, you can use the UpdateBuilder:

http://ormlite.com/docs/update-builder

For example:

UpdateBuilder<Order, Integer> updateBuilder = orderDAO.updateBuilder();
updateBuilder.updateColumnValue(Order.STATUS_FIELD_NAME, OrderStatus.PENDING);
updateBuilder.where().eq(Order.ID_FIELD_NAME, 1);
updateBuilder.update();