Question

Edit fields in DBGrid with Query

Asked by: prevarant

Hi experts,
How to edit fields in DBGrid with Query?
When I using Table component there is no problem but with Query nothing hapens.
When I type a new value in Query and press ENTER, old value returns.

How to solve the problem?

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Asked On
2007-06-15 at 02:49:29ID22635936
Tags

dbgrid

,

edit

Topics

Delphi Programming

,

Delphi Components

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4
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Answers

 

by: RickJPosted on 2007-06-15 at 03:03:49ID: 19290389

Make sure you are working with a dataset that can be updated.
Depending on your sql statement and database, setting the RequestLive property on the query to true will work.

 

by: alex_codePosted on 2007-06-16 at 09:18:46ID: 19298595

>>>>When I type a new value in Query and press ENTER, old value returns.<<<<

You mean ADOQuery with an adoconnection and a datasource that you connect to the adoquery and the dbgrid reads from the datasource.

if i understood correctly what you mean, if you want to update some fields to the database and not to the dbgrid as you said you have to put the adoquery to update mode.

for example

...code code...

             adoquery1.Edit;
                    adoquery1.FieldByName('field_name_here').AsString:=edit1.text;
                           adoquery1.Post;
....code code.....

hope that helps...

 

by: mocartsPosted on 2007-06-16 at 23:00:33ID: 19301597

that depends.. if you want your data in database to be updated right after post (move to next row) or you may want implement Save/Cancel functionality in your application.
Instant update is what TTable do (or TQuery with LiveRequest enabled - however there is strong limitations for LiveRequest to work - read help for that property)
Best approach would be to let the user to decide whether he/she wants to save their changes or cancel. That could be done by implementing CachedUpdates what means you need to enable TQuery.CachedUpdates property and either assign TUpdateSQL compoenent to TQuery.UpdateObject property or implement TQuery.OnUpdateRecord event (just setting CachedUpdates will not work e.g. your Query component will not be editable) - now you can do your save operation in one transaction ([TQuery.]Database.StartTransaction/Commit or Rollback on error)

there is much more solutions (for ex., by using in mem ClientDataSet) but this one is easiest one

wbr, mo.

 

by: Computer101Posted on 2008-03-25 at 15:49:03ID: 21207106

Forced accept.

Computer101
EE Admin

20120131-EE-VQP-002

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