I'm starting with Oracle ADF. I'm trying my first examples with basic components.
Starting from classic HR schema for Oracle ADF (Departments, Employees, Regions, Countries, etc.), I drop a SelectOneChoice for DepartmentsView1, and then I drop a SelectManyCheckbox for related EmployeesView3.
So, the data are well matched and, all employees from selected department are displayed.
Well, my two questions are:
How can I preselect all checkboxes in the SelectManyCheckbox componente? I need that all related employees were preselected.
If I had an input text box, a button and a SelectManyCheckbox component, how can I bind typed value in input box to the query (View Object) and then list the result in the SelectManyCheckbox component?
Maybe they are very basic questions, but I've recently started with Oracle ADF, coming from Java Spring Framwork and I'm changing the problem and programming approach and my mind too.
Any help is very appreciated, because this is a great change for me.
For your first question you've asked, you need to get the binding
(and cast it to JControlListBinding) of the selectManyCheckbox from the bindings
and set its selected values via setSelectedIndices method.
If you want them all to be preselected, you can iterate through all
values, find their indexes, put them in an array and then pass as a
parameter to the setSelectedIndices method.
For the second one,
I have no idea about the reason behind such an operation, but i
guess you could create an appropiate Row with the value the has been
typed in to the box, then you could add it to the RowSet
(via createRow() method of the ViewObjectImpl.) that is bound the selectManyCheckbox.
Maybe because of my rookieness, I don't think that the questions you've asked can considered to be basic. :)
Bonne chance in your ADF adventure by the way.
Related
I'm working on a portal based on Orchard CMS. We're using Orchard to manage the "normal" content of the site, as well as to model what's essentially data for a small application embedded in it.
We figured that doing it that way is "recommended" for working in Orchard, and that it would save us duplicating a bunch of effort in features that Orchard already provides, mainly generating a good enough admin UI. This is also why we're using fields wherever possible.
However, for said application, the client wants to be able to display the data in the regular UI in a garden-variety datagrid that can be filtered, sorted, and paged.
I first tried to implement this by cobbling together a page with a bunch of form elements for the filtering, above a projection with filters bound to query string parameters. However, I ran into the following issues with this approach:
Filters for numeric fields crash when the value is missing - as would be pretty common to indicate that the given field shouldn't be considered when filtering. (This I could achieve by changing the implementation in the Orchard source, which would however make upgrading trickier later. I'd prefer to keep anything I haven't written untouched.)
It seems the sort order can only be defined in the administration UI, it doesn't seem to support tokens to allow for the field to sort by to be changed when querying.
So I decided to dump that approach and switched to trying to do this with just MVC controllers that access data using IContentQuery. However, there I found out that:
I have no clue how, if at all, it's possible to sort the query based on field values.
Or, for that matter, how / if I can filter.
I did take a look at the code of Orchard.Projections, however, how it handles sorting is pretty inscrutable to me, and there doesn't seem to be a straightforward way to change the sort order for just one query either.
So, is there any way to achieve what I need here with the rest of the setup (which isn't little) unchanged, or am I in a trap here, and I'll have to move every single property I wish to use for sorting / filtering into a content part and code the admin UI myself? (Or do something ludicrous, like create one query for every sortable property and direction.)
EDIT: Another thought I had was having my custom content part duplicate the fields that are displayed in the datagrids into Hibernate-backed properties accessible to query code, and whenever the content item is updated, copy values from these fields into the properties before saving. However, again, I'm not sure if this is feasible, and how I would be able to modify a content item just before it's saved on update.
Right so I have actually done a similar thing here to you. I ended up going down both approaches, creating some custom filters for projections so I could manage filters on the frontend. It turned out pretty cool but in the end projections lacked the raw querying power I needed (I needed to filter and sort based on joins to aggregated tables which I think I decided I didn't know how I could do that in projections, or if its nature of query building would allow it). I then decided to move all my data into a record so I could query and filter it. This felt like the right way to go about it, since if I was building a UI to filter records it made sense those records should be defined in code. However, I was sorting on users where each site had different registration data associated to users and (I think the following is a terrible affliction many Orchard devs suffer from) I wanted to build a reusable, modular system so I wouldn't have to change anything, ever!
Didn't really work out quite like I hoped, but to eventually answer the question in your title: yes, you can query fields. Orchard projections builds an index that it uses for querying fields. You can access these in HQL, get the ids of the content items, then call getmany to get them all. I did this several years ago, and I cant remember much but I do remember having a distinctly unenjoyable time with it haha. So after you have an nhibernate session you can write your hql
select distinct civr.Id
from Orchard.ContentManagement.Records.ContentItemVersionRecord civr
join civ.ContentItemRecord cir
join ci.FieldIndexPartRecord fipr
join fipr.StringFieldIndexRecord sfir
This just shows you how to join to the field indexes. There are a few, for each different data type. This is the string one I'm joining here. They are all basically the same, with a PropertyName and value field. Hql allows you to add conditions to your join so we can use that to join with the relevant field index records. If you have a part called Group attached directly to your content type then it would be like this:
join fipr.StringFieldIndexRecord sfir
with sfir.PropertyName = 'MyContentType.Group.'
where sfir.Value = 'HR'
If your field is attached to a part, replace MyContentType with the name of your part. Hql is pretty awesome, can learn more here: https://docs.jboss.org/hibernate/orm/3.3/reference/en/html/queryhql.html But I dunno, it gave me a headache haha. At least HQL has documentation though, unlike Orchard's query layer. Also can always fall back to pure SQL when HQL wont do what you want, there is an option to write SQL queries from the NHibernate session.
Your other option is to index your content types with lucene (easy if you are using fields) then filter and search by that. I quite liked using that, although sometimes indexes are corrupted, or need to be rebuilt etc. So I've found it dangerous to rely on it for something that populates pages regularly.
And pretty much whatever you do, one query to filter and sort, then another query to getmany on the contentmanager to get the content items is what you should accept is the way to go. Good luck!
You can use indexing and the Orchard Search API for this. Sebastien demoed something similar to what you're trying to achieve at Orchard Harvest recently: https://www.youtube.com/watch?v=7v5qSR4g7E0
I have a working system that lets me build a database containing instances of various entities , all linked together nicely.
Before I knew I would care, I came across a tutorial on using Core Data and bindings, and it went through a complete case where you get a table showing all the entities of some type with a column for each property. It showed both the UI side and the Data model side - not that I need the data model part at this point. Now, darned if I can find it. This is one of those things that is supposed to be easy, and requires virtually no code, but getting exactly the right connections in UIBuilder is not going to happen if I can't find instructions.
Also, I thought I came across an example of something like a query editor where the user could select which properties to sort on, which to match on, etc. Did I imagine that?
Anyone out there know where I can find such?
Sure, you can do this without code:
Add an array controller to your nib.
Bind or connect an outlet for its managed object context
Set the array controller to Entity mode, fill in the entity name, and select Prepares Content.
Bind your table view columns to array controller's arranged objects, and fill in the key name for the model key.
Regarding the query editor, open up the model, and on the Editor menu click Add Fetch Request.
I found at least a partial answer to the query editor question, in this apple tutorial. Not sure how far it will get me, as I prefer to write code where possible, since then I can leave a trail of comments.
List of values, with multiple columns and multiple return values in Apex. It's a question i've seen around the web quite a few times, but i'm struggling with it aswell.
Coming from Oracle Forms, and now migrating forms to Apex, this is a feature i'm missing quite well. It also still baffles me a bit how enormously basic the built-in popup-lov is.
For example, right now i'm making some smaller forms, each having about 4 or 5 multirecord columns, for not much else than having 2 values linked up. Column 1: some value, used in sap for example, column 2: the id of a record in the oracle database (another table than the base table for the block). On column 2 there is an lov, with validate from list, and displays 3 columns, but also returns 3 columns. So you can choose a record from the lov, and automatically, the id will be filled in, aswell as the 'name' and 'description' for said id. Column 1 and column 2 form the base table of the block.
Now, in Apex, i'd loose this functionality by default. So for now, i've mostly coded the onchange event in javascript, and get the values with an ajax callback process. In the popup i concatenate the 3 columns. This however looks stupid (in my most humble opinion) when you want to force the user to pick a value from the lov ('Not Enterable, Show Display Value and Store Return Value'): the item will contain the concatenated value used in the lov, not just the id i'd much rather show - plus, i'll already have my other 2 fields filled in by the ajax callback.
It rather stings a bit to have to deal with this. The users are used to working with these old (headstart generated) forms, with just 2 enterable columns, one of which has an lov. Now they need to start working with this 'new tech', and even though there is some adjustment required, this area does feels a bit archaic at times!
So, i've made it work through an Ajax callback on the onchange event. So, when the value is changed through the lov, extra fields are filled up. This goes together with an after header process, after the automated row fetch, so the values are fetched when the page is loaded (or a user navigates the rows).
I've also written a custom solution, which requires me to create a page with a classic report on it with a search box. I then use this page in an iframe, and pop it up through a modal. When the user selects a record, i return the required returnvalue and a list of displayvalues. This i do through a bunch of javascript, which i've packed in a JS file, and actually requires quite little extra work to do on the pages: include the file on both, make an item with some post element text calling an 'open' procedure, and calling a select-and-close procedure on my lov page. I'm quite considering creating a small item typep plug-in, so i can more easily configure my calling item. Just a couple of buts: i've not actually used this in some forms already, i've engineered this in a testing application after getting frustrated with the standard tool. It would also require the client to maintain this javascript code + remember the config of the 2 items, let alone me writing a small plugin. So i'm hesitant to implement this.
TLDR: if you've been using Apex for a while, and maybe done some forms: how do you actually work with the popups. And if you've known forms: how did you deal with this change?
I'm still struggling - throw me a bone ;)
I haven't used it myself yet but I believe SkillBuilders Super LOV plug-in probably does what you need.
How to do databse driveen jsp page,
Suppose i have 5 text fields,if user wants to put one of the form field as select box.JSp should identify and return the select box if it define in db as select box.
I dont know how to achieve this,can anyone suggest this.
Regards,
Raju komaturi
There are multiple tasks if you want to do this completely. The world at large has not gone this way and so there are not many tools (if any) for this. But basically here are the main ideas.
1) You want a "data dictionary", a collection of meta-data that tells you what the types and sizes of each column are, and the primary and foreign keys are.
2) For your example of "knowing" that a field should be a drop-down, this almost always means that column value is a foreign key to another table. Your code detects this and builds a listbox out of the values in the parent table.
3) You can go so far as to create a complete form generator for simple tables, where all of the HTML is generated, but you always need a way to override this for the more complex forms. If you do this, your data dictionary should also have column descriptions or captions.
There are many many more ideas, but this is the starting point for what you describe.
I am now to the stage of adding validation to a simple app for editing a few SQL tables via data-bound controls. I can see that the BindingSource knows the limits of the table's structure: if I enter, for example, letters in a field that should contain only decimals, up pops a DataError exception with the message that you can only enter decimals there.
It seems to me that ADO.NET should be able to use reflection to generate basic validation for all the data-bound fields. But after a lot of Googling, I see only people creating their own validation by column by column.
Can I use ADO.NET's knowledge of the database structure to have it make some of the basic validation for me (e.g. data type, text field length limits)? Do you have some examples?
I'm sad that I've never gotten a good response on this question... but I think I have my answer:
Yes, it should be possible, but no, it hasn't been done yet.
(Maybe someday I'll start a project myself to make a tool which would auto-generate basic validation values for data-bound form fields.)