如何在 ORMLITE android On Upgrade 方法中添加主键？

Question

In my project I have used ORMLite. Now I added a primary key for tje accountId field and also have changed DB Version. Please help me, I don't know how to write query in onUpgrade(...) . For reference I have attached Account class below.

public class Account implements Serializable {
    @DatabaseField
    private String cdate;

    @DatabaseField(id=true)
    private Integer accountId;

    @DatabaseField
    private String Type;

    @DatabaseField
    private String Desc;

    @DatabaseField
    private String UpdatedDate;
}

Answer 1

I don't know how to write query in onUpgrade(...).

The trick is to figure out what Sqlite commands you need to make to add a primary key. You can figure this out by looking at the Sqlite docs for the primary key . There you can see that your accountId field should be defined as:

accountId INTEGER PRIMARY KEY ASC

So then your onUpdate(...) method should be something like:

if (version of db is the old-version) {
    dao.executeRaw("ALTER TABLE account ADD COLUMN accountId INTEGER PRIMARY KEY ASC;");
}

You should do this conditionally based on the old version of the DB.