android - ORMLite id 生成

Question

我有这个对象:

public class Set {
    @DatabaseField(columnName = "setID", generatedId = true)
    private int setID;
    @DatabaseField(columnName = "setName")
    private String setName;
}

如果我制作这样的对象:

Set newSet = new Set("name");
setDao.create(newSet);

然后如果我这样做:

int id = newSet.getID();

我会获取集合 ID 还是应该从数据库中获取整个对象

setDao.queryForEq("setName", "name");

Answer 1

因此 ORMLite 文档非常广泛。如果你查找generated-id in the docs您会看到以下语句:

Boolean whether the field is an auto-generated id field. Default is false. Only one field can have this set in a class. This tells the database to auto-generate a corresponding id for every row inserted. When an object with a generated-id is created using the Dao.create() method, the database will generate an id for the row which will be returned and set in the object by the create method.

因此在您调用setDao.create(newSet) 之后，newSet 对象的setID 字段将更改为数据库中的id。

此外，调用字段 setID 是一种非常糟糕的模式。我建议只使用 id。