Question

clear table

Asked by: mezura

how can i show a dbgrid with a clear table with fileds even if there are information inside the database? i just dont want the datas to be shown when i start my program.

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Asked On
2003-08-26 at 06:31:07ID20720259
Topic

Delphi Programming

Participating Experts
5
Points
50
Comments
8

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Answers

 

by: knightmadPosted on 2003-08-26 at 06:37:41ID: 9223799

Well, you question is hard to understand (maybe you should to clarify it for help up : ) But if I understood it correctly, you want your DBGrid to show the columns but not the data. You can do it adding the columns of the DBGrid by hand, double click the DBGrid and add columns in the way you want, and be sure your TTable (or whatever is the Dataset) active property is set to false before to compile your program.

 

by: geobulPosted on 2003-08-26 at 06:48:34ID: 9223913

Hi,

In design-time:
1. add one query component,
2. attach DataSource1 (which the grid is connected to) to that query,
3. write query.SQL = 'SELECT * FROM tablename WHERE 1=2',
4. make the query active

in run time when you want your grid to display data (in a button click for example):

procedure TForm1.Button1Click(Sender: TObject);
begin
  DataSource1.DataSet := Table1;
  Table1.Open;
end;

To hide the records again:

procedure TForm1.Button2Click(Sender: TObject);
begin
  DataSource1.DataSet := Query1;
  Table1.Close;
end;

Regards, Geo

 

by: mezuraPosted on 2003-08-26 at 06:48:58ID: 9223918

i have this database with many records. when i start my program all those record always show up. what i want is to start my program not showing any records but just the new records that i am about to input.

 

by: coondogPosted on 2003-08-26 at 07:42:28ID: 9224435

Why not create a new table in your database with the same format as the original and call it TempTable.  Have the grid connect to the TempTable on startup and then when you are ready, copy the records from the TempTable to the original table. After this clear the TempTable and it will be ready for next time.

 

by: sybernitePosted on 2003-08-26 at 14:19:05ID: 9227838

in addition to geobul's comment, you could just set the datasource's dataset to nil when you wish to hide the data again.
eg. DataSource.DataSet := nil;

 

by: mezuraPosted on 2003-08-26 at 14:54:29ID: 9228056

if i use DataSource.DataSet := nil; the fields are also hidden. i just want the records but the the field names.

 

by: sybernitePosted on 2003-08-26 at 22:42:39ID: 9229966

Add all the columns to the grid (with the columns editor) at design time. Setting the datasource to nil will still retain the column information

 

by: delphizedPosted on 2003-09-11 at 03:09:19ID: 9335634

You can use a TQuery and in the SQL you put your select and a where clause as WHERE 'A'='B' or something else, so your recordset will be empty and you can input in the grid.
when you post you'll not see the new record because of the where , but you can think some Where that defines the new records added...
bye ;)

20120131-EE-VQP-002

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