如何在 Delphi 7 上使用日期时间选择器

Question

How to use TDateTimePicker with time format (hour:minute:second)?
I tried this code:

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');

Also this code:

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');

Also this code:

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');

but those wont work, help me to correct them.
I'm using SQLYog against a MySQL database.

UPDATE

@Jens Borrisholt i try this code before, but it doesnt work either

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

Your query is wrong

• and fieldname is too much

---

shortened with data

NOT OK

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

OK

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

---

example valid SQL with data

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

All together with your code. without and 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

I mt sure what is your exact requirement.ill try to help you.

I)If you want to compare the date of the datetimepicker against a date of datetime field in table,

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)If you want to compare the date time of the datetimepicker against a date time of datetime field in the table,

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)If you want to compare the time of the datetimepicker against a time of datetime field in table,

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)))]))

Please let me know if your requirement is not the same