I have two reports I'm redoing.
The first has basic info, and the second has the exact same thing plus some more information.
Both are made using FastReport and master/detail with TSqlQuery and TClientDataset.
The first has 3 details and the second has 5.
Is there a way to make only one report document and disable the details dynamically?
Obs: I can't load the TClientDataset and then hide the elements on the first report because the query takes a long time to run: about 30 seconds to load the first report and about 10 minutes for the second one.
Thank you #MartynA for the help.
I manage to do it but it took more work than I think it should.
Clear the DataSource property on your TSqlQuery;
Clear the DataSetField property on your TClientDataSet (detail);
Remove the field used on DataSetField from your TClientDataSet (master);
And if you're using FastReport, the ClientDataSet must be active so you use the method CreateDataSet.
Related
I'm using Delphi 10 with Firedac , I have with two tables in a Master-Detail configuration , A(Document) and B(DocDetail) . In my Form I have two DBgrids, linked to each Datasource respectively. I want a configuration, if possible, that delete all records items in table DocDetail when I delete its corresponding Master record in the master DBgrid. Is there any configuration in the table FDTable component that does such action ? Or there any other way to do delete master - delete detail in Delphi side ? (I know that it is possible to do it in database side through a constraint delete cascade). Thanks for your help.
The properties you are looking for on the TFDQuery component are FetchOptions.DetailCascade and/or FetchOptions.DetailServerCascade
From the help on DetailServerCascade
When DetailServerCascade is False, then FireDAC posts client-side
cascading changes to the database. The client-side cascading changes
are performed when DetailCascade is True. So DetailServerCascade
should be used together with DetailCascade.
If you are using CachedUpdates you may also need a TFDSchemaAdapter component. This CentralizedCachedUpdates Sample page list all of the steps need to setup the components when using cached updates.
I am using this on one form with good results. It was a little bit picky to get it all setup correctly. Basically every DataSet involved in the update needs to point to one common TFDSchemaAdapter component. Then any Master datasets need to have their FetchOptions.DetailCascade set to true to ensure that the rows are correctly deleted from the child datasets
I am trying to use Macros in FireDAC to Preprocess my SQL Queries. I have a TADQuery object on a Data Module with the SQL set to something like:
Select * from MyTable
join OtherTable on MyTable.Key = OtherTable.Key
&Where
Then in my code I do this:
WhereClause = 'stuff based on my form';
Query.MacroByName('Where').AsRaw := WhereClause;
Query.Open;
This has worked great for complicated queries because it lets me make sure my fields and join conditions are correct using the SQL Property editor.
My problem is when the SQL statements ends up invalid because of my where clause. Is there any way to see the SQL after pre-processing that is going to be executed? Right now I am catching the FireDac errors and showing the SQL that is on EADDBEngineException object. However that is still showing my original SQL with the macros. If I can't get to it after the error happens is there anyway to force the Macro replacement to take place so I can look at the SQL in the debugger to help me see what is wrong.
If it matters I am connecting to a MS Access database with the goal of moving to SQL Server in the near future.
Apart from using Text property, to monitor what SQL is actually going to the database engine, consider using the "FDMonitor" FireDAC utility. According to the DokWiki pages (below):
drop a TFDMoniRemoteClientLink component on your form,
Set its Tracing property to True,
Add the MonitorBy=Xxx connection definition parameter to your existing FDConnection component. You can do this in the IDE object inspector, by selecting your FDConnection component, expanding the Params property, and setting MonitorBy to mbRemote.
Note that the TFDMoniXxxxClientLink should come before TFDConnection in the data module or form creation order, so adjust this by right clicking on the form or data module, then Creation Order, and moving the TFDMoni.. component above the FDConnection.
Also, it's helpful in the options of the TFDMoniXxxxClientLink, to disable most of the events being recorded, otherwise all the data returned is also shown in the FireDAC monitor. Expand the EventKinds property, and turn all the event kinds off, except for perhaps ekConnConnect, ekConnPrepare, and ekCmdExecute.
Then open the FireDAC Monitor from the IDE, (Tools > FireDAC Monitor). Start your app only once the monitor is running. Double click on a trace event (in the Trace Output tab), and you will see the actual SQL sent to the database in the bottom pane.
It also seems likely that adding the EventType of ekConnPrepare as mentioned above, would show you when the query's Prepare is called, but I haven't played enough with it say for sure.
Please see the following pages on the DocWiki for more information:
Overview: FDMonitor
How to: Tracing and Monitoring (FireDAC)
Other FireDAC utilities: Utilities (FireDAC)
(Just to remove this question from list of unanswered questions)
From comments:
Well, I've roughly checked what's happening there and I'm still not
sure if calling Prepare (which is useless for you as I get) is the
minimal requirement to trigger that preprocessing. Though, the
preprocessed SQL, the one which is sent to the DBMS you can access
through the Text property (quite uncommon name for such property). – TLama Feb
21 '14 at 8:18
I have created a report using FastReport Designer (Delphi 2010). I have one TfrxIBXQuery (Query1) connected with main database -Base1(frxIBXComponents.DefaultDatabase:=Base1). It works fine, I can get data using Query1+MasterData band.
The problem arises when I'm trying to get data from another database in the same report.
In Designer I drop new frxIBXDatabase (Base2), set the necessary properties. Add new TfrxIBXQuery (Query2) and connect it with Base2.
But I can't get any data from Query2 because it does not see Base2.
How do I solve this problem?
When you look at the properties tab from your query component, can you see any FieldAliases?
If not, you should check the SQL, FastReport can be really picky when it comes to parameters.
Try changing parameter names and see if that works.
If you want to use two or more databases inside report - you should use two TfrxIBXDatabase inside report (on the Data tab)
Clear frxIBXComponents.DefaultDatabase property
HI,
I created 4 radiobuttons in a intraweb application.
One is checked by default, the rest is not.
The belong to the same group called group. (I set the group properly of each TIWradiobutton)
There is twiimage image which has click event. In that click event, I tried to set the radiobuttons.
E.g.
radiobutton1.checked:=true;
The problem is that this sometimes set the radiobutton and sometimes it does not.
I found a fix by setting the rest of radiobuttons.checked to false. That fixed the problem.
I wonder what I did wrong in the first place when I just used one assignment.
Can you tell me if it is a bug in intraweb or I used radiobutton improperly?
Thanks.
just create a IWRadioGroup1(in iwstanderd pallet ) in your form
select IWRadioGroup1 , in the properties panenel dblclick on items
you will get a stringlist editor ,type the captions of your four radiobuttons line by line then click OK
now select your IWImage1 ,goto click events just type th above code
procedure TformMain.IWImage1Click(Sender: TObject);
begin
IWRadioGroup1.ItemIndex := 2 // 2 is the radiobutton number as you typed in stringlist editor
end;
sometimes IW or components build over the IW (e.g TMS suite for IW) have a strange behavior.you can find how it works by looking out in the code, how they manage the java script behind your radio groups.
Also sometimes you must manage the components exactly how Atozed say in their documentation.
Probably isn't the best answer, but if you'll work a lot with IW you'll see that it has a lots of limitations and strange behavior (only if you don't work in their style, which sometimes differs a lot from win32 style).
best regards,
I need a delphi component for Delphi 2007 win32 that have features like Google search text box.
** While User writing search key it should fill/refresh the list with values, and user can select one of them.
**User can go up and down list and can select one of them.
**List should contain codes and text pair, so user can select text and I can get code for database operations.
(Google can highlight the search text in List but I think it is not possible with Delphi 2007, so it is not expected.)
I tried Dev Express TcxMRUEdit, however it doesn't meet my needs
Since you have DevExpress, why don't you try the cxLookupComboBox in lsEditMode and with ImmediateDropDown = True?
Check out woll2woll components. The TLookupcombobox has done this since Delphi 3 (or earlier). This is not spam, I just use the library.
http://www.woll2woll.com/
I also had the same problem and unfortunately didn't find a suitable component. I was also inspired from google.
So it turned out to be easier for me to "simulate a component" by using an editbox and a grid placed under it. As the user types something in the editbox the query refreshes and the proper resulst are shown in the grid. I have many columns in the grid, the query results try to match all the fields (so if I type 'po', the query will return all records where any field is like 'po%'). I also added a delay of 500ms after the user types to avoid to run too many unnecessary queries (another aproach could be to kill the thread as the user strikes a new key, if the query is run in a thread).
In this way I obtained the required functionality, even if without higlighting the search text, anyway my users are delighted by this.
In every place I am using this "component" I am attaching a query at runtime so it can be used in many different forms.
I somehow was also inspired by the skype UI: when you display the lsit of contacts you can type something and the contacts will be filtered accordingly (skype uses an editbox + grid/listbox).