如何在 Delphi 7 上使用日期时间选择器

Question

如何使用时间格式（时：分：秒）的TDateTimePicker ？
我试过这个代码：

Sql.text:= ('select * from namatabel where namafield between '+quotedstr(formatdatetime('yyyy/mm/dd', datetimepicker1.date))+' and '+quotedstr(formatdatetime('yyyy/mm/dd', datetimepicker2.date))+' and field order by field ASC');

还有这个代码：

Sql.text:= ('select * from tablename where fieldname between '+quotedstr(formatdatetime('yyyy/mm/dd hh:mm:ss', datetimepicker1.date))+' and '+quotedstr(formatdatetime('yyyy/mm/dd hh:mm:ss', datetimepicker2.date))+' and fieldname order by fieldname ASC');

还有这个代码：

Sql.text:= ('select * from tablename where fieldname between '+quotedstr(formatdatetime('yyyy/mm/dd hh:mm:ss', datetimepicker1.datetime))+' and '+quotedstr(formatdatetime('yyyy/mm/dd hh:mm:ss', datetimepicker2.datetime))+' and fieldname order by fieldname ASC');

但那些行不通，帮我纠正他们。
我正在对 MySQL 数据库使用SQLYog 。

更新

@Jens Borrisholt 我以前试过这个代码，但它也不起作用

SQL.Add('SELECT meteran.kd_meter as no,kamar.nama,meteran.waktu,meteran.meter '+
        'FROM meteran,kamar WHERE kamar.idkamar = meteran.idkamar AND meteran.waktu BETWEEN :tgl1 and :tgl2 and waktu group by waktu asc');
ParamByName('tgl1').AsString:=FormatDateTime('yyyy-mm-dd',DateTimePicker1.DateTime);
ParamByName('tgl2').AsString:=FormatDateTime('yyyy-mm-dd',DateTimePicker2.DateTime); end;
DBGrid2.DataSource.DataSet:=MyQuery2;

Answer 1

您的查询有误

• 和 fieldname太多了

---

用数据缩短

不好

Sql.text:= 'select * from tablename where fieldname between "2006-06-11"'+
           'and "2006-06-19" and fieldname order by fieldname ASC';

好的

Sql.text:= 'select * from tablename where fieldname between "2006-06-11" '+
           'and "2006-06-19" order by fieldname ASC';

---

带有数据的有效 SQL 示例

select * from auktionen where auktionende between '2006-06-11' and '2006-06-19' order by auktionende ASC;

所有与您的代码一起。 没有和 waktu

BETWEEN :tgl1 and :tgl2 and waktu

---

MyQuery2.Close;
MyQuery2.SQL.Text := 'SELECT meteran.kd_meter as no,kamar.nama,meteran.waktu,meteran.meter '+
        'FROM meteran,kamar WHERE kamar.idkamar = meteran.idkamar'+
        ' AND meteran.waktu BETWEEN :tgl1 and :tgl2'+
        ' group by waktu';
MyQuery2.ParamByName('tgl1').AsString:=FormatDateTime('yyyy-mm-dd',DateTimePicker1.Date);
MyQuery2.ParamByName('tgl2').AsString:=FormatDateTime('yyyy-mm-dd',DateTimePicker2.Date);
DBGrid2.DataSource := DataSource1;
MyQuery2.Open;

Answer 2

我确定您的确切要求是什么。我会尽力帮助您。

I）如果你想在的DateTimePicker日期比较对日期时间字段的表的日期，

SQL.Add(format('select * from tablename where cast ([my_date_time_var] as date) between %s and %s ' ,[Quotedstr(FormatDateTime('MM/DD/YYYY',(datepicker1.Date))),Quotedstr (FormatDateTime('MM/DD/YYYY',(datepicker2.Date)))]))

II)如果要将datetimepicker的日期时间与表中datetime字段的日期时间进行比较，

SQL.Add(format('select * from tablename where my_date_time_var between %s and %s ' ,[Quotedstr(FormatDateTime('MM/DD/YYYY HH:MM:SS',(datepicker1.DateTime))),Quotedstr(FormatDateTime) ('MM/DD/YYYY HH:MM:SS',(datepicker2.DateTime)))]));

III) 如果要将日期时间选择器的时间与表中日期时间字段的时间进行比较，

SQL.Add(format('select * from tablename where cast ([my_date_time_var] as time) between %s and %s ' ,[Quotedstr(FormatDateTime('HH:MM:SS',(datepicker1.time))),Quotedstr (FormatDateTime('HH:MM:SS',(datepicker2.Time)))]))

如果您的要求不一样，请告诉我