Android 选择返回特定时间后的作业数的查询

下面是我的sqllite表，我正在使用Java获取当前时间，现在我将如何进行查询，返回我在特定时间后的作业总数

  private static final String TABLE_COMPLETED_JOBS = "jobs";

String CREATE_COMPLETED_TABLE = "CREATE TABLE " + TABLE_COMPLETED_JOBS
            + "(" + KEY_COMPID + " INTEGER PRIMARY KEY," + KEY_TIMEJOB
            + " TEXT,"   + KEY_PICK + " TEXT," + KEY_DEST + " TEXT,"
            + KEY_FARE + " TEXT,"
            + KEY_TIMEWEEK + " DateTime" + ")";






            String selectQuery = "SELECT  * FROM " + TABLE_COMPLETED_JOBS + " ORDER BY 
             "+KEY_TIMEWEEK+" ; 

               String mydate =  

      java.text.DateFormat.getDateTimeInstance().format(Calendar.getInstance().getTime());

---

假设您编写的查询有效：

String selectQuery = "SELECT  * FROM " + TABLE_COMPLETED_JOBS + " ORDER BY 
         "+KEY_TIMEWEEK+" ;

在执行数据库操作的databaseHandler类中，可以使用游标获取计数，如下所示：

db = this.getReadableDatabase();
Cursor c = db.rawQuery(selectQuery);
int counter;

if(c != null) {
    counter = c.getCount();
}

c.close();
return counter;

因此：如果

counter=0

，则表示没有获取记录；如果

counter>0

，则表示有记录

希望有帮助

以下是查询

SELECT COUNT(*)
FROM jobs
WHERE KEY_TIMEWEEK > myDate

这里，

KEY\u TIMEWEEK

应该是列的名称，

myDate

应该是

yyyy-MM-dd

格式的日期。您可以按如下方式设置日期格式：

SimpleDateFormat dbDateFormat = new SimpleDateFormat("yyyy-MM-dd");

Calendar c = Calendar.getInstance();
String myDate = dbDateFormat.format(c.getTime);

这将以yyy MM dd格式返回当前系统日期

int myCount = getData();

Handler handle = new Handler();

handle.postDelayed(new Runnable() 
           {    
             @Override
             public void run() 
             {      
               "the code to be exec."
             }
           }, delayTimeInMilliseconds);

         }    

---

只需在处理器延迟时间中添加以毫秒为单位的时间，即可获得所需的输出

---

谢谢

select count（*）或select query将返回一个结果集，返回的行数cud将提供count给我示例查询plz

public void getData(){

db = this.getReadableDatabase();
Cursor c = db.rawQuery(selectQuery);
int counter;

if(c != null) {
    counter = c.getCount();
}

c.close();
return counter;


}