如何在 Delphi 7 上使用日期時間選擇器

Question

如何使用時間格式（時：分：秒）的TDateTimePicker ？
我試過這個代碼：

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');

還有這個代碼：

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');

還有這個代碼：

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，幫我糾正他們。
我正在對 MySQL 數據庫使用SQLYog 。

更新

@Jens Borrisholt 我以前試過這個代碼，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

您的查詢有誤

• 和 fieldname太多了

---

用數據縮短

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';

---

帶有數據的有效 SQL 示例

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

所有與您的代碼一起。 沒有和 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

我確定您的確切要求是什么。我會盡力幫助您。

I）如果你想在的DateTimePicker日期比較對日期時間字段的表的日期，

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)如果要將datetimepicker的日期時間與表中datetime字段的日期時間進行比較，

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) 如果要將日期時間選擇器的時間與表中日期時間字段的時間進行比較，

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)))]))

如果您的要求不一樣，請告訴我