android - ORMLite：有没有办法告知 QueryBuilder 应该使用哪个引用来连接？

Question

我正在尝试对以下类执行连接查询：

public class EquipmentCharacteristic {
    @DatabaseField(canBeNull = false, foreign = true, uniqueCombo = true)
    private Equipment equipment;

    @DatabaseField(canBeNull = false, foreign = true, uniqueCombo = true)
    private Characteristic characteristic;

    ...
}

public class Characteristic {
    ...
}

public class Equipment {
    ...
}

查询生成器：

QueryBuilder<EquipmentCharacteristic, ?> daoEC = entityDAO.getDAO(
            EquipmentCharacteristic.class).queryBuilder();
daoEC.where().eq(EquipmentCharacteristic.EQUIPMENT + "_id", equipment.getId());

QueryBuilder<Characteristic, ?> daoCharacteristic = entityDAO.getDAO(
    Characteristic.class).queryBuilder();

return daoEC.join(daoCharacteristic)
    .selectRaw(
            "EquipmentCharacteristic." + EquipmentCharacteristic.ID, 
            "EquipmentCharacteristic." + EquipmentCharacteristic.EQUIPMENT + "_" + Equipment.ID, 
            "EquipmentCharacteristic." + EquipmentCharacteristic.POSSIBLE_VALUES, 
            "EquipmentCharacteristic." + EquipmentCharacteristic.CHARACTERISTIC + "_" + Characteristic.ID, 
            "EquipmentCharacteristic." + EquipmentCharacteristic.VALUE, 
            "Characteristic." + Characteristic.FIXED_VALUE, 
            "Characteristic." + Characteristic.UNIT, 
            "Characteristic." + Characteristic.CHARACTERISTIC)
    .queryRaw().closeableIterator();

问题是创建的查询与设备而不是特征连接：

SELECT 
    EquipmentCharacteristic.id, 
    EquipmentCharacteristic.equipment_id, 
    EquipmentCharacteristic.possibleValues, 
    EquipmentCharacteristic.characteristic_id, 
    EquipmentCharacteristic.value, 
    Characteristic.fixedValue, 
    Characteristic.unit, 
    Characteristic.characteristic 
FROM `EquipmentCharacteristic` INNER JOIN `Characteristic` ON `EquipmentCharacteristic`.`equipment_id` = `Characteristic`.`id` 

如果我在 EquipmentCharacteristic 中将 Characteristic 引用放在 Equipment 之前，则不会出现问题。

public class EquipmentCharacteristic {
    @DatabaseField(canBeNull = false, foreign = true, uniqueCombo = true)
    private Characteristic characteristic;

    @DatabaseField(canBeNull = false, foreign = true, uniqueCombo = true)
    private Equipment equipment;

    ...
}

有没有办法通知 QueryBuilder 应该使用哪个表（类）来连接？

谢谢。

Answer 1

问题是创建的查询与设备而不是特征连接：

很抱歉，我无法重现此内容。我已将以下测试添加到主干。如果您能弄清楚为什么我的测试有效但您的代码失败了，那将非常有帮助。

https://github.com/j256/ormlite-core/commit/78223c682aa0d7063c095afc0e26b466aeb618af

不幸的是，没有太多答案。