从java中的字符串转换日期或时间时转换失败

Question

我在java中创建了两个方法，一个返回数据库服务器时间，另一个返回数据库服务器一小时前的时间。现在我必须将这两个日期时间用于sql查询。检索数据库的代码服务器时间是：-

     public String database_Time() throws SQLException
       {

        con = getConnection();
        String sql = "select GETDATE()";
        clstmt = con.prepareCall(sql); 

        clstmt.execute();
        rs = clstmt.getResultSet();
        while(rs.next()) {
        timestr= rs.getString(1);
        }

        System.out.println("database time is" +timestr);

        return timestr;
       } 

另一种检索一小时前时间的方法是

  public String previostime() throws ParseException, SQLException
    {   
     database_Time();

     String format = "yyyy-MM-dd HH:mm:ss";
      SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);
      Date date = simpleDateFormat.parse(timestr);
      Calendar calendar = Calendar.getInstance();
      calendar.setTime(date);
      int hours = calendar.get(Calendar.HOUR_OF_DAY);
      hours--;
      calendar.set(Calendar.HOUR_OF_DAY, hours);
      fixedDate = calendar.getTime();
      stringDate = simpleDateFormat.format(fixedDate );
     System.out.println("previous date is"+(stringDate));
     System.out.println("current date is"+timestr);
     return stringDate;
     }

但是当我在 sql 查询中使用 stringDate 和 timestr 时，我得到一个错误 com.microsoft.sqlserver.jdbc.SQLServerException: Conversion failed when converting date and/or time from character string.

sql查询的代码是：- String sql = "select * from vs1_bag where logtime between 'stringDate'and 'timestr' ";

编辑：- 我将检索时间并在我的应用程序中使用它的方法是：-

public String [] getChartTime() throws SQLException, ParseException
    {   
    List<String> tStr = new ArrayList<String>();
    database_Time();
    String atime[] = null;
    previostime();
    getConnection();
    try
        {
             con = getConnection();

             stmt = con.createStatement();
  String sql = "select * from vs1_bag where logtime between 'stringDate'and 'timestr' ";
           stmt.executeQuery(sql);
           rs = stmt.getResultSet();

        while(rs.next()) {
            // Just get the value of the column, and add it to the list
            tStr.add(rs.getString(1).substring(11,16));
           }

        }
        catch( Exception e )
        {
            System.out.println("\nException in  Bean in getDbTable(String code):"+e);
        }


         finally
         {
            closeConnection();
         }
          // I would return the list here, but let's convert it to an array
     atime=  tStr.toArray(new String[tStr.size()]);

     return atime;


    }

如何解决。

Answer 1

不应该是这样吗？ ：

String sql = "select * from vs1_bag where logtime between '"+stringDate+"' and '"+timestr+"' ";