如何在 Delphi 7 上使用 datetimepicker

Question

如何将TDateTimePicker与时间格式（时：分：秒）一起使用？
我试过这段代码：

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');

还有这段代码：

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');

还有这段代码：

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');

但是这些都行不通，请帮我纠正它们。
我正在对 MySQL 数据库使用 SQLYog。

更新

@Jens Borrisholt 我之前尝试过这段代码，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

您的查询错误

• 字段名太多了

---

用数据缩短

不行

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;

全部与您的代码一起。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

我不确定您的具体要求是什么。我会尽力帮助您。

I)如果您想将 datetimepicker 的 date 与表中 datetime 字段的 date 进行比较，

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)如果您想比较日期时间选择器的日期时间与表格中日期时间字段的日期时间，

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)如果您想比较 datetimepicker 的 时间 和表中 datetime 字段的 时间，

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