I've got dialog with QTableView that is using QSqlTableModel and QSortFilterProxyModel, and they are reading from SQL Database. I want to change the color of my columns [3 , 4 , 5].
I am using the following code:
ui->tableView->model()->setData(
ui->tableView->model()->index(1,2),
QVariant(QBrush(Qt::red)),
Qt::BackgroundRole);
I am searching solution for 4 days already, and still nothing. Please tell me what to do. Whatever it is, i just need some new source code, or some other way, or just to edit my piece of code.
The problem is that neither the proxy model nor the QSqlTableModel will do anything with the background role. So you set it, but if you cared to check for the result returned by setData, you'd notice that it's false: what you're doing is a no-operation.
Just think about it: the SQL database in general has no way of storing an attribute like the background color together with other data in a given field. Similarly, the proxy model is there only to sort the data, and it doesn't give you any extra storage.
What you need to do is to insert a custom proxy between the table model and the sort/filter proxy. That proxy needs to store such extended attributes for you. Then it'll work.
Related
I would really like to understand how to use the "count" property of the IconTabFilter for SAPUI5 to dynamically show the count of the result set of a table.
I have the following code -
<IconTabFilter
count="{DataSet/$count}">
<Table items="{DataSet}">
But the count is not filled automatically.
I am using an oData model that is bound on the view level. I do not want to make another backend request just for the counts. What am I doing wrong here? Is there a different mechanism that can be used?
I also tried using the updateFinished event on the table to then get the count and set it via JS but the event is triggered only on DOM placement of the table. In my case the table is hidden behind the IconTab and is not placed into the DOM till the first time the user clicks the tab so its useless.
Really would appreciate some insight into how to use this!
Thanks!
Okay, so what I did was I bound my information to a local model and did an oData $expand query to fetch the entire pages information in one call.
This worked out for me because I had several sets of data to be fetched. Before they were bound individually to tables, now they are all in one query.
In the .done() method of the call I just used the setCount method of the IconTabFilter to set the count as per the return data set.
I have a database in access for institute. there is a [Registers] Table and [Certificates] Table.
I want to give Mark to each of Registers a Mark. I want to set Validation Rule for Each
If [Certificates].[Mark]>70
Then UpdateRecord
SetField
CertificateID "GENERATE AutoNumber"
My Problem is i cant handle the CertificateID Generate with Macro. i cant use DMAX.
looking for a solution to give CertificateID to only Registers who passed the Course.
Tried "After Update" Macro and "After Insert" macro but still didnt success.
is there any other way to give AutoNumber except "DMax"?
Well, i just already found a way but not the best way.
I just added another Table as "Certificates" and renamed current(Certificates) to "Marks".
Tables and Fields
i made a query with Select a "Grade" from Certificates Table and rest from Marks. Whenever i fill a record in Grade table it generate Autonumber for "CertificateID" a new number.
For Validation i set my validation Rule in my form on Grade which i cant fill that field if Marks.Mark is less than 70. ( [Marks].[Mark] < 70)
I know its not a good way.
Still looking for better answer
I have a little appliation that shows MySQL data in web browser ListGrid. It has 14 columns.
I would like to upgrade it so the user could add query parameters.
For this job the best I could imagine is the grid.setShowFilterEditor() that put text boxes above the column headers and will live together with the column header when moved or resized.
I planned to use the filter button FilterEditorSubmitHandler() to get the filter values and run the query.
Unfortunately, I can not find any solution to get the text from a certain filter box eg. the value that was written by the user into the box above Column_#1. Is there any way to do that or this FilterEditor grown together with the DataSources object, and not available for any other data binding?
Something like this, but without using DataSource:
http://www.smartclient.com/smartgwt/showcase/#grid_sortfilter_disable_filter
As per my knowledge, filter editor works on com.smartgwt.client.data.DataSource only.
If you want to have filterEditor in ListGrid, you have to use DataSource or go for some custom implementation.
I'm writing a database access app for storing some data and want to ask a few questions about the model/view architecture.
(Using: Qt 4.7.4, own build; PostgreSQL 9.0; Targets: WinXP, Win7 (32/64 bit))
Let me first explain what I am trying to achieve and where I am currently.
I have two pages (subclassed QWidgets inserted in a QStackedWidget) with a QTableView bound to a model. Each view is bound to a table in the PostgreSQL server. You can add/edit/delete/sort/filter items.
Each page can be seen by only one type of users, lets call the roles Role1 and Role2.
The submit strategies of everything connected to the model are OnManualSubmit.
(Transaction isolation level = Serializable.) When two users want to edit(for example) the same row, I want to do a "SELECT ... FOR UPDATE" query - to make sure that when someone edits something, he will merge his changes with newer ones (if any, just like in SVN for example). But I see only a submitAll() method the QSqlTableModel.
Maybe catching the signals beforeUpdate(), beforeDelete(), beforeInsert() and performing manually "SELECT ... FOR UPDATE" is one option.
The other way I think is to subclass QSqlTableModel. What is the clean and nice way to achieve this?
I want to periodically update the QSqlTableView for each of the pages (one page is seen at most, Role1 users have access only to Page1 and the same for Role2 => Page2).
The first thing that came to my mind is to use a QTimer and manually call select() of the QSqlTableModel, but... not sure if this is the cool way.
I also want to periodically check if the connection to the database is ok, but I think that a QTimer + QSqlDatabase::isOpen () will do.
Now, the 2 tables have the same primary keys and some columns are the same. I want when a user with Role1 changes a row in Table1 to automatically change corresponding columns of Table2 and vice versa. Should I create a trigger in Postgres?
BTW, the database is small - each of the two tables is around 3-4000 rows with ~10 columns (varchars mostly, 1 text and 2 date colunms).
Thanks for reading and Happy New Year! :)
I think you should consider doing something of the following:
Instead of using QSqlTableModel as a model I'd implement my own model as a subclass of QAbstractTableModel. This will allow you a lot of control over what you can do in terms of data manipulation.
One thing that this will require is for certain fields in the table you would need to implement subclass of QAbstractItemDelegate that will allow for modification of data in the table as I am fairly sure you don't want to allow users updating any field in the table as for example primary key is likely have to be left alone.
For question 2 I would suggest implementing a field called transaction_counter for every row so you don't have to select every row in the table just the updated ones the transaction_counter will be updated on every row update and the new one will be inserted on the new row insert. One thing that will be required is that the counter is unique across the table. For example if initial state of the table is: row1 has counter = 0 and row2 has counter = 0. If row1 is updated counter set to 1. When row1 is then updated again counter on it is set to 2. When row2 is now updated counter on it is set to 3, etc. You can certainly do the data refreshes now using QTimer and this will be much more advantageous to for example checking the data as one user may be updating the same table as another user with the same Role.
For Question 3. I don't see any reason why not custom models and especially if you decide to separate data from the model you can manipulate data separately from it's display. Sort of Data->Model->View->Controller implementation. Each one can be maintained separately as long as you have a feedback mechanism for your delegates.
For Question 4. The answer is sure or you can implement the trigger in your application.
Hope this helps. Have a great New Year!
Ok so I have drop down list connected to a datasource, and I need to change 2 or 3 of the values before they are displayed and I'm just having trouble figuring out what to do. I'm assuming I setup some kind of loop to check the values, but thats all I can figure. Does anybody have any general suggestions or resources they know that I can look up? Thanks.
You need to do your processing before you bind the datasource. So for example, create a dataset of results or arraylist, process the results changing your values and then bind to your dataset/arraylist.
You'll need to be more specific about what you are binding to and how you want to process for me to be more specific..
See link at http://www.c-sharpcorner.com/uploadfile/sd_patel/dropdownlistbox11222005064123am/dropdownlistbox.aspx