从房间数据库中获取当前星期和月份的数据

Question

我正在尝试从 Room 中的当前周和月获取数据。我创建了一个当前 Day 查询，它可以工作，但其他的都不能工作。

日查询（这个有效）：

 @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();

月份：

@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

根据文档，strftime('%W', ...) 用从 0 开始替换一年中的一周，Calendar.get(Calendar.WEEK_OF_YEAR) 从 1 开始返回一年中的一周。同样，strftime('%m', ...) 用基于 1 的值替换一年中的一周，Calendar.get(Calendar.MONTH) 用从 0 的值返回一年中的一周。

所以，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;

而不是

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