Question

我正在寻找一种方法来将DateTime对象和Duration作为我的值对象的一部分。

这是我的价值对象：

@DatabaseTable(tableName = DrivingRecord.TableName)
public class DrivingRecord {
    public final static String TableName = "drivingRecord";
    public final static String DRIVING_TASK_COLUMN_NAME = "drivingTask";

    @DatabaseField(foreign = true, columnName = DRIVING_TASK_COLUMN_NAME)
    private DrivingTask drivingTask;

    @DatabaseField(generatedId = true)
    private int id;

    @DatabaseField(dataType = DataType.LONG)
    private DateTime startTime;

    @DatabaseField
    private Duration durationOfDriving;
}

我得到以下异常：

java.lang.IllegalArgumentException: Field class org.joda.time.Duration for field FieldType:name=durationOfDriving,class=DrivingRecord is not valid for type com.j256.ormlite.field.types.LongType@41223060, maybe should be long

尝试为DateTime

创建条目时，我也遇到了同样的异常

Answer 1

java.lang.IllegalArgumentException: Field class org.joda.time.Duration for
    field FieldType:name=durationOfDriving,class=DrivingRecord is not valid for
    type com.j256.ormlite.field.types.LongType@41223060, maybe should be long

此邮件试图告诉您，您的Duration字段durationOfDriving与日期类型DataType.LONG不兼容。我不确定你发布的代码是不正确的，但我认为你会尝试这样做：

@DatabaseField(dataType = DataType.LONG)
private Duration durationOfDriving;

ORMLite原生支持DateTime，但不支持持久保存Duration。试图强迫它成为一个长期将无法正常工作。您将不得不为Duration定义客户持久性。

查看documentation on custom persisters了解如何启动自己的信息。

您还可以查看此答案以获取另一个示例：Is there any way to disable ORMLite's check that a field declared with DataType.SERIALIZABLE implements Serializable?

Answer 2

这是显示我能够解决问题。使时间戳变长，并保存时区。现在，如果需要，我可以搜索时间戳。

@DatabaseTable(tableName = DrivingRecord.TableName)
public class DrivingRecord {
    public final static String TableName = "drivingRecord";
    public final static String DRIVING_TASK_COLUMN_NAME = "drivingTask";

    @DatabaseField(foreign = true, columnName = DRIVING_TASK_COLUMN_NAME)
    private DrivingTask drivingTask;

    @DatabaseField(generatedId = true)
    private int id;

    @DatabaseField(dataType = DataType.LONG)
    private long startTime;

    @DatabaseField
    private Duration durationOfDriving;

    @DatabaseField(canBeNull = false, dataType= DataType.SERIALIZABLE)
    private DateTimeZone timeZone;

    public void setDateTime(DateTime dateTime){
        this.startTime = startTime.getMillis();
        this.timeZone = startTime.getZone();
    }

    public DateTime getDateTime(){
        return new DateTime(startTime, timeZone);
    }

}

Answer 3

虽然JodaTime不能与ORMLite一起使用，但您可以使用与ORMLite一起使用的Java Date。您可以在JodaTime和Date之间进行转换。

@DatabaseField
protected Date createdAt;

public static String formatDateTime(DateTime dateTime1) {
    if (dateTime1 == null || dateTime1.getYear() == 0) {
        return "";
    }
    DateFormat df = DateFormat.getDateInstance(DateFormat.SHORT, ApplicationBase.AppContext.getResources().getConfiguration().locale);
    Calendar calendar02 = new GregorianCalendar(dateTime1.getYear(), dateTime1.getMonthOfYear() - 1, dateTime1.getDayOfMonth());
    Date date3 = calendar02.getTime();
    String date3str = DataItemBase.formatDate(date3);
    return date3str;
}

在Android上使用JodaTime（DateTime，Duration）和ORMLite

3 个答案: