android - greendao 中主键短时出现 ClassCastException

Question

我创建了一个只需要通过 Short 来标识的实体。

这是我生成的代码:

public Source(Short id, String name) {
    this.id = id;
    this.name = name;
}

测试代码DatabaseHelperTest.java:

public void testInsertAndLoad(){
    Source source = new Source((short) 0, "TestSource");
    SourceDao sourceDao = daoSession.getSourceDao(); //#line 26
    sourceDao.insert(source);
    Short id = source.getId();
    assertNotNull(id);
}

当我运行测试时，我得到了 ClassCastException:

Running tests
Test running started
java.lang.ClassCastException: java.lang.Short cannot be cast to java.lang.Long
at de.greenrobot.dao.identityscope.IdentityScopeLong.put(IdentityScopeLong.java:31)
at de.greenrobot.dao.AbstractDao.attachEntity(AbstractDao.java:695)
at de.greenrobot.dao.AbstractDao.updateKeyAfterInsertAndAttach(AbstractDao.java:362)
at de.greenrobot.dao.AbstractDao.executeInsert(AbstractDao.java:355)
at de.greenrobot.dao.AbstractDao.insert(AbstractDao.java:293)
at com.tuanchau.DatabaseHelperTest.testInsertAndLoad(DatabaseHelperTest.java:26)
at java.lang.reflect.Method.invokeNative(Native Method)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:190)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:175)
at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:555)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1584)

那么，GreenDAO是否允许让short成为primary key？ 而且，我该如何处理这个异常。

谢谢

更新:

数据库生成代码

Entity source = schema.addEntity("Source");
Entity category = schema.addEntity("Category");

source.addShortProperty("id").primaryKey().getProperty();
source.addStringProperty("name").notNull();

category.addIntegerProperty("id").primaryKey().getProperty();
category.addStringProperty("name").notNull();
Property csid = category.addLongProperty("sid").notNull().getProperty();

category.addToOne(source, csid);

源属性

public static class Properties {
    public final static Property Id = new Property(0, Short.class, "id", true, "ID");
    public final static Property Name = new Property(1, String.class, "name", false, "NAME");
};

类别属性

public static class Properties {
    public final static Property Id = new Property(0, Integer.class, "id", true, "ID");
    public final static Property Name = new Property(1, String.class, "name", false, "NAME");
    public final static Property Sid = new Property(2, short.class, "sid", false, "SID");
};

Answer 1

来自 greenDao website :

Current primary key (PK) restrictions: Currently, entities must have a long or Long property as their primary key. This is recommended practice for Android and SQLite. greenDAO is prepared to handle any primary key scenario in the future, but not everything is implemented completely yet. To work around this issue, you can use a long primary key and use an unique index for the intended “key” properties.

你可以尝试使用这样的东西:

source.addIdProperty();
source.addShortProperty("shortId").unique().getProperty();
source.addStringProperty("name").notNull();