从房间数据库中获取当前周和月的数据

Question

我正试图从当前的每周和每月的房间中获取数据。我已经创建了一个当前的Day查询，它可以工作，但其他的不起作用。

日查询（这个工作）：

 @Query("SELECT * FROM expense_table WHERE day = strftime('%d', 'now')")
LiveData<List<Expense>> getExpensesDay();

周：

@Query("SELECT * FROM expense_table WHERE week = strftime('%W', 'now')")
LiveData<List<Expense>> getExpensesWeek();

月：

@Query("SELECT * FROM expense_table WHERE month = strftime('%m', 'now')")
LiveData<List<Expense>> getExpensesMonth();

实体：

@Entity(tableName = "expense_table")
public class Expense  {

@PrimaryKey(autoGenerate = true)
private int expenseId;
private String note;
private Double value;
private String type;
private Long dateLong = System.currentTimeMillis();
private String date = new SimpleDateFormat("MM/yyyy").format(new Date(dateLong));
private static Calendar cal = Calendar.getInstance();
private int month = cal.get(Calendar.MONTH);
private int week = cal.get(Calendar.WEEK_OF_YEAR);
private int day = cal.get(Calendar.DAY_OF_MONTH);
private int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK);
private String weekDay = new DateFormatSymbols().getWeekdays()[dayOfWeek];

Answer 1

根据文件，strftime('%W', ...)以0为基础代替一年中的一周，而Calendar.get(Calendar.WEEK_OF_YEAR)以1为基础的年份返回一周。同样地，strftime('%m', ...)以1为基础替换一年中的一周，而Calendar.get(Calendar.MONTH)以0为基础返回一年中的一周。

因此，尝试替换Entity类中的字段计算：

private int month = cal.get(Calendar.MONTH) + 1;
private int week = cal.get(Calendar.WEEK_OF_YEAR) - 1;

代替

private int month = cal.get(Calendar.MONTH);
private int week = cal.get(Calendar.WEEK_OF_YEAR);