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How to handle JPA annotations for a pointer to a generic interface

- by HDave

I have a generic class that is also a mapped super class that has a private field that holds a pointer to another object of the same type: @MappedSuperclass public abstract class MyClass<T extends MyIfc<T>> implements MyIfc<T> { @OneToOne() @JoinColumn(name = "previous", nullable = true) private T previous; ... } My problem is that Eclipse is showing an error in the file at the OneToOne "Target Entity "T" for previous is not an Entity." All of the implementations of MyIfc are, in fact, Entities. I should also add that each concrete implementation that inherit from MyClass uses a different value for T (because T is itself) so I can't use the "targetEntity" attribute. I guess if there is no answer then I'll have to move this JPA annotation to all the concrete subclasses of MyClass. It just seems like JPA/Hibernate should be smart enough to know it'll all work out at run-time. Makes me wonder if I should just ignore this error somehow.

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Is this more suited for key value storage or a tree?

- by JC

I'm trying to figure out the best way to represent some data. It basically follows the form Manufacturer.Product.Attribute = Value. Something like: Acme.*.MinimumPrice = 100 Acme.ProductA.MinimumPrice = 50 Acme.ProductB.MinimumPrice = 60 Acme.ProductC.DefaultColor = Blue So the minimum price across all Acme products is 100 except in the case of product A and B. I want to store this data in C# and have some function where GetValue("Acme.ProductC.MinimumPrice") returns 100 but GetValue("Acme.ProductA.MinimumPrice") return 50. I'm not sure how to best represent the data. Is there a clean way to code this in C#?

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Java - JDBC alternatives

- by Mike

Hello, this is just teorethical question. I use JDBC with my Java applications for using database (select, insert, update, delete or whatever). I make "manually" Java classes which will contain data from DB tables (attribute = db column). Than I make querys (ResultSet) and fill those classes with data. I am not sure, if this is the right way. But I've read lot of about JDO and another persistence solutions. Can you please recommend some? Which are modern? Will be used in the future? Some advantages of JDO over JDBC (in simple words). I've been able to google lot of this stuff, but opinions from the "first hand" are always best. Thank you for responses, Mike

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How to support both DataContractSerializer and XMLSerializer for the same contract on the same host?

- by Sly

In our production environment, our WCF services are serialized with the XMLSerializer. To do so our service interfaces have the [XMLSerializerFormat] attribute. Now, we need to change to DataContractSerializer but we must stay compatible with our existing clients. Therefore, we have to expose each service with both serializers. We have one constraint: we don't want to redefine each contract interface twice, we have 50 services contract interfaces and we don't want to have IIncidentServiceXml IIncidentServiceDCS IEmployeeServiceXml IEmployeeServiceDCS IContractServiceXml IContractServiceDCS How can we do that? This is a description of what we have tried so far but I'm willing to try completely different approaches: We tried to create all the endpoints by code in our own ServiceHostFactory class. Basically we create each endpoint twice. The problem is that at runtime, WCF complains that the service has two endpoints with the same contact name but with different ContractDescription instances. The message says we should use different contract names or reuse the same ContractDescription instance.

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PHP upload file using PUT instead of POST

- by Marco Demaio

I read something about this on PHP docs, but it's not celar to me: Do the most widely used browsers (IE, FF, Chrome, Safari, Opera, ...) support this PUT method to uplaod files? What HTML should I write to make the browser call the server via PUT request. I mean do I need to write a FORM with an INPUT file field and just replace the attribute method="POST" with the method="PUT"? On the PHP docs (link above) they say a PUT request is much simplier than a POST request when uploading file, along with this advantage, what other advantages/disadvanatges do the PUT has comapred to teh POST? Thanks!

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How to set initial checked values of rich tree leaf node.

- by Ajay99

Hi, How to set the initial the leaf node values. -----------------------Stations.xml AAAAAAAAAAAA BBBBBBBBBBBB CCCCCCCCCC DDDDDDDDDDDD EEEEEEEEEEEEEE Hall Oates - Kiss On My List David Bowie - Let's Dance Lyn Collins - Think (About It) Kim Carnes - Bette Davis Eyes KC the Sunshine Band - Give It Up //inital check values --------------------Libray.java---------------- public class Library { private TreeNode treeData; private List menus=null; public Library()throws Exception { menus=new ArrayList(); //it's initial selection of the check box vardata.attributes.selection("---key1---); vardata.attributes.selection("---key2---); vardata.attributes.selection("---keyn---); yoursuggestedcode.attribute.selection("key"); //I need your suggestion code. FacesContext context = FacesContext.getCurrentInstance(); treeData = XmlTreeDataBuilder.build(new InputSource(getClass().getResourceAsStream("/Stations.xml"))); } public TreeNode getTreeData() { return treeData; } public void setTreeData(TreeNode treeData) { this.treeData = treeData; } public List getMenus() { return menus; } public void setMenus(List menus) { this.menus = menus; }

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richfaces keepAlive not working

- by Jurgen H

I have a mediaOutput tag which, in its createContent attribute, requires the backing bean to be in a certain state. A list of values, which is filled in an init method, must be available. I therefore added a keepAlive tag for the whole backing bean. I now indeed see the backingBean in stead of some (richfaces) proxy bean, but the filled list is null again. How to make this possible? I checked that the init method was called and that the list is filled in in the init method. <a4j:keepAlive beanName="myBean" /> <a4j:mediaOutput createContent="#{myBean.writeChart}" ... /> The backing bean public class MyBean implements Serializable { public List list; public void init(ActionEvent event) { // call some resource to fill the list list = service.getItems(); } public void writeChart(final OutputStream out, final Object data) throws IOException { // list is null } // getters & setters }

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Add a Carriage Return to the Output of an XSL Transformation

- by dsrekab

I am trying to use XSLT to convert an XML document to a text file and the text of the document looks fine. However, I need to add a carriage return after the end of each line (NOT A CRLF) and I seem to be failing in every attempt. I have tried adding just a CR at the end of the line like this: <xsl:text></xsl:text> I have tried changing my media-type to string, I have tried to add the disable-output-escaping attribute to the text element, but it always adds a CRLF. This is on a Windows OS and I know that Windows uses CRLF for a new line, but I would have thought you could override that if you said to specifically use only the CR or the LF (e.g. VB.net's VBCR or VBLF). Does anyone know if it is possible to only output a CR with XSLT? Thanks in advance.

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LINQ-to-XML to DataGridView: Cannot edit fields -- How to fix?

- by Pretzel

I am currently doing LINQ-to-XML and populating a DataGridView with my query just fine. The trouble I am running into is that once loaded into the DataGridView, the values appear to be Un-editable (ReadOnly). Here's my code: var barcodes = (from src in xmldoc.Descendants("Container") where src.Descendants().Count() > 0 select new { Id = (string)src.Element("Id"), Barcode = (string)src.Element("Barcode"), Quantity = float.Parse((string)src.Element("Quantity").Attribute("value")) }).Distinct(); dataGridView1.DataSource = barcodes.ToList(); I read somewhere that the "DataGridView will be in ReadOnly mode when you use Anonymous types." But I couldn't find an explanation why or exactly what to do about it. Any ideas?

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REXML Formatting issues

- by dagda1

Hi, I am using REXML to edit an xml file but have ran into difficulties with formatting. My original code looked like this: file = File.new( destination) doc = REXML::Document.new file doc.elements.each("configuration/continuity2") do |element| element.attributes["islive"] = "true" element.attributes["pagetitle"] = "#{@client.page_title}" element.attributes["clientname"] = "#{@client.name}" end doc.elements.each("configuration/continuity2/plans") do |element| element.attributes["storebasedir"] = "#{@client.store_dir}" end I first of all had to add the following code as REXML was adding single quotes instead of double quotes. I found the following via google: REXML::Attribute.class_eval( %q^ def to_string %Q[#@expanded_name="#{to_s().gsub(/"/, '"')}"] end ^ ) I also have a problem in that REXML is reformatting the document. are there ways to stop this? Cheers Paul

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ASP.NET MVC - Add XHTML into validation error messages

- by Neil

Hi, Just starting with ASP.Net MVC and have hit a bit of a snag regarding validation messages. I've a custom validation attribute assigned to my class validate several properties on my model. When this validation fails, we'd like the error message to contain XHTML mark-up, including a link to help page, (this was done in the original WebForms project as a ASP:Panel). At the moment the XHTML tags such as "< a ", in the ErrorMessage are being rendered to the screen. Is there any way to get the ValidationSummary to render the XHTML markup correctly? Or is there a better way to handle this kind of validation? Thanks

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Create xml type with no body

- by Pace

Hopefully this is an easy question. How can I define an XML type such that the type doesn't have a body. As an example I can define the Foo type as follows... <xs:complexType name="Foo"> <xs:simpleContent> <xs:extension base="xs:string"> <xs:attribute name="id" type="xs:integer" use="required"/> </xs:extension> </xs:simpleContent> </xs:complexType> But that would allow the following... <Foo id="7">STUFF I DON'T WANT</Foo> Is there a way I can change the xsd so that the Foo element isn't allowed any body?

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MySQL triggers cannot update rows in same table the trigger is assigned to. Suggested workaround?

- by Cory House

MySQL doesn't currently support updating rows in the same table the trigger is assigned to since the call could become recursive. Does anyone have suggestions on a good workaround/alternative? Right now my plan is to call a stored procedure that performs the logic I really wanted in a trigger, but I'd love to hear how others have gotten around this limitation. Edit: A little more background as requested. I have a table that stores product attribute assignments. When a new parent product record is inserted, I'd like the trigger to perform a corresponding insert in the same table for each child record. This denormalization is necessary for performance. MySQL doesn't support this and throws: Can't update table 'mytable' in stored function/trigger because it is already used by statement which invoked this stored function/trigger. A long discussion on the issue on the MySQL forums basically lead to: Use a stored proc, which is what I went with for now. Thanks in advance!

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Sorting of table column by string length not working as intended when done in IB via cocoa - binding

- by Miraaj

Hi all, I made a sample application displaying list of employees with their salaries over NSTableView using NSArrayController. Basic functionality is working as intended. Also sorting is working fine when Selector - compare or caseInsensitiveCompare is assigned in attribute pane for table column- employeeName. Problem occurs when I try to sort it by string length by setting selector in IB as - length, for the table column - employeeName. It does sorting by string length but does it inappropriately. It is doing sorting on alternate clicks ie. on first click it sorts the content in table in descending order by length. Then on second click it does not arrange contents in ascending order by length but sets arrow on top as in ascending. Then on third click it arranges contents in ascending order by length but sets arrow on top of table column as in descending and so on... Can anyone suggest if I am wrong somewhere? Thanks, Miraaj

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Reference the oncomplete event by an external java script function

- by user339637

Hi , I want to do some logic at the oncomplete attribute of the a4j:commandButton ,but my logic is too complicated , can I reference the code using a java script functions located in a external java-script file to have a better maintenance ? I found it has error because the JavaScript file cannot understand the EL expression . For example , originally I have , <a4j:commandButton id="btn1" action="#{MBena1.action1}" oncomplete="if( {MBena1.variable1}){Richfaces.showModalPanel('modelPanel1');};if (......) then "> I want to do something like this: <a4j:commandButton action="#{MBena1.action1}" oncomplete="Btn1OnComplete();"> the code is put inside the java script function Btn1OnComplete() which is located in a external java-script file. Thanks

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avoid preselection of a view when focus is gained android

- by Sephy

Hi all, I don't know if the title is very clear, but my issue is as follows : I have an activity with a listview, and on top of this listview, i have a searchfield (edittext). The issue is that when i try debugging on a phone, the virtual keyboard gets out straight after the screen displays the activity... And of course, it's hidding half of the list... So, is there an attribute or something I can use to prevent this from happening?(I still want to keybord to appear when i click the edittext though...) thank you

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Set date format in ruby model (sinatra/datamapper)

- by Gearóid

Hi, I have a ruby model that contains a date attribue which I'd like to be able to pass in as a parameter in the format dd/MM/yyyy. However, my sqlite3 db stores the data in yyyy-MM-dd format so when a date like 20/10/2010 gets passed in, it will not be read to the database. I am using the Sinatra framework and using haml for the markup creation. Do I need to write a helper that takes the date string and converts it to the correct format for the db? Or can I set a format type on the models attribute? Thanks.

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Paging in ActiveRecord

- by Alex

Does CastleProject ActiveRecord support paging? I need to load only data which is now seen on the screen. If I use [HasMany], it will be loaded as a whole either immediately or at the first call (if lazy attribute is true). However I only need something like first 100 records (then maybe 100 next records). Another question is how to load only 100 items. If the collection is too big, memory can reach its limit if we constantly load more and more items.

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Custom prerequsites to visual studio setup project

- by Sandy

I have a Visual Studio Setup project and have followed the steps mentioned in this link to load the Shared Add-in Support Update for the Microsoft .NET Framework 2.0 (KB908002) to the prerequisites list. The entry appears but there is this following warning shown No 'HomeSite' attribute has been provided for 'Shared Add-in Support Update for Microsoft .NET Framework 2.0 (KB908002)', so the package will be published to the same location as the bootstrapper. I use the Download component from the component vendor's website option. How do I set a homesite for this update so that the update is directly downloaded and installed. I do not want to distribute the update along with my setup. Thanks

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html form using input as a submit button

- by Mike

Hello onlookers, A web site I've been using has some interesting behavior... There is a form, but there is no button for submission. Instead, there is an input: <input id="ctl00_pageContent_loginButton" type="image" style="border-width: 0px;" alt="Login" src="images/btn_login.gif" name="ctl00$pageContent$loginButton"/> and when you hover over it the cursor turns into a hand, like an anchor tag -- however I do not see any css (in firebug) showing that the input should have a hover attribute. Further, the input does not have any sign of being an actual link/submission button. I'm stumped -- would love to know how they were able to do this. The web page is: https://my.sa.ucsb.edu/gold/Login.aspx Thank you!

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Workaround for abstract attributes in Java

- by deamon

In Scala I would write an abstract class with an abstract attribute path: abstract class Base { val path: String } class Sub extends Base { override val path = "/demo/" } Java doesn't know abstract attributes and I wonder what would be the best way to work around this limitation. My ideas: a) constructor parameter abstract class Base { protected String path; protected Base(String path) { this.path = path; } } class Sub extends Base { public Sub() { super("/demo/"); } } b) abstract method abstract class Base { // could be an interface too abstract String getPath(); } class Sub extends Base { public String getPath() { return "/demo/"; } } Which one do you like better? Other ideas? I tend to use the constructor since the path value should not be computed at runtime.

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How to set skin at runtime in Flex 4

- by Ben

Hi, I have a bunch of custom controls based on a SkinnableContainer. When adding the control at design time, I can specify a skin by using the skinClass attribute on the tag. I need to add some of these elements during runtime, and I can't figure out how to specify the skinClass for my controls. eg. var something:CustomThing = new CustomThing(); /* mistery code here to attach the skin ? */ addElement(something); How do I do this? Thanks!

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Is this XSLT correct for the XML file which I have developed?

- by atrueguy

This is my XML file. I need to develop a xslt for this. <?xml version="1.0" encoding="ISO-8859-1"?>   <svg width="100%" height="100%" viewBox="0 0 214.819 278.002"> <g id="Standard_x0020_layer"/> <g id="Catalog"> <line stroke-width="0.353" stroke-linecap="butt" x1="5.839" y1="262.185" x2="209.039" y2="262.185"/> <text transform="matrix(0.984 0 0 0.93 183.515 265.271)" stroke="none" fill="#000000" font-family="'Helvetica'" font-size="3.174">© 2009 k Co.</text> <text transform="matrix(0.994 0 0 0.93 7.235 265.3)" stroke="none" fill="#000000" font-family="'Helvetica'" font-size="3.174">087156-8-</text> <text transform="matrix(0.995 0 0 0.93 21.708 265.357)" stroke="none" fill="#000000" font-family="'Helvetica'" font-size="3.174" font-weight="bold">AB</text> <path stroke-width="0.088" stroke-linecap="butt" stroke-dasharray="2.822 1.058" d="M162.037 107.578L174.439 100.417L180.698 104.03"/> <g id="AUTOID_20445" class="52971"> <line stroke-width="0.088" stroke-linecap="butt" x1="68.859" y1="43.621" x2="65.643" y2="45.399"/> <text transform="matrix(0.944 0 0 0.93 69.165 43.356)" stroke="none" fill="#000000" font-family="'Helvetica'" font-size="2.775" font-weight="bold">52971</text> </g> </g> </svg> I have developed a XSLT for this in this way, but I am failing to produce the desired output can any one help me in this. <?xml version="1.0" encoding="ISO-8859-1"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:svg="http://www.w3.org/2000/svg"> <xsl:template match="/"> <fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format"> <fo:layout-master-set> <fo:simple-page-master master-name="simple" page-height="11in" page-width="8.5in"> <fo:region-body margin="0.7in" margin-top="1.15in" margin-left=".8in"/> <fo:region-before extent="1.5in"/> <fo:region-after extent="1.5in"/> <fo:region-start extent="1.5in"/> <fo:region-end extent="1.5in"/> </fo:simple-page-master> </fo:layout-master-set> <fo:page-sequence master-reference="simple"> <fo:flow flow-name="xsl-region-body"> <fo:block> <fo:instream-foreign-object> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" height="100%" width="100%" viewBox="0 0 214.819 278.002"> <xsl:for-each select="svg/g"> <svg:g style="stroke:none;fill:#000000;"> <svg:path> <xsl:variable name="s"> <xsl:value-of select="translate(@d,' ','')"/> </xsl:variable> <xsl:attribute name="d"><xsl:value-of select="translate($s,',',' ')"/></xsl:attribute> </svg:path> </svg:g> </xsl:for-each> <xsl:for-each select="svg/g"> <svg:line x1 = "{$x1}" y1 = "{$y1}" x2 = "{$x2}" y2 = "{$y2}" style = "stroke-width: 0.088; stroke: black;"/> <line xmlns="http://www.w3.org/2000/svg" x1="{$x1}" y1="{$y1}" x2="{$x2}" y2="{$y2}" stroke-width="0.088" stroke="black" fill="#000000" /> </xsl:for-each> </svg:svg> </fo:instream-foreign-object> </fo:block> </fo:flow> </fo:page-sequence> </fo:root> </xsl:template> </xsl:stylesheet> Please help me in this

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How can I compare Core Data models?

- by Don

I noticed while doing system testing that a feature of our app had been removed. It looks like at some point, an older version of a file was checked into SVN that was missing a property. This specific file was generated from the Core Data model, and sure enough, the latest version of the model in SVN is missing the same attribute. I need to find out if any other attributes are missing, or if anything else in the model changed. However, the elements file in the .xcodedatamodel folder appears to binary and I can't compare the revisions. Is there a way to find the differences between two Core Data models in SVN? Barring that, what would be the best way to accomplish this task?

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Adding configChanges ="locale" programatically

- by chrisonline

I use configChanges="locale" on my activities. Without this options in AndroidManifest.xml in 2.x i get flickering screens. It works in all my activities excepting in the preferences screen i add programatically. I have one Preference Activity -- it works after setting configChanges="locale" to the AndroidManifest.xml. Inside of the Preference Activity i add programatically a new preferencescreen. For this new PreferenceScreen i dont have an activity in the AndroidManifest.xml! So i cannot add the configChanges="locale" and the screen flickers on 2.x !! How can i add the attribute configChanges="locale" programatically?

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