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  • What are the most common SQL anti-patterns?

    - by le dorfier
    All of us who work with relational databases have learned (or are learning) that SQL is different. Eliciting the desired results, and doing so efficiently, involves a tedious process partly characterized by learning unfamiliar paradigms, and finding out that some of our most familiar programming patterns don't work here. What are the most common antipatterns you've seen (or your self committed), whether generic or product-specific, whether in SQL statements directly, or in the ways applications build and apply them?

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  • blocking url using firefox extension

    - by user272483
    how can i control access to webpages in firefox. i'm going to develope a new addon for this but colud you tell me what should i do? can firefox extension programming allows this. or should i develop a desktop application to control access. thx in advance.

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  • Video Game Bots?

    - by cam
    Something I've always wondered, especially since it inspired me to start programming when I was a kid, was how video game bots work? I'm sure there are a lot of different methods, but what about automation for MMORPGs? Or even FPS-type bots?

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  • Differnce between linux write and sendfile syscall

    - by JosiP
    Hi Im programming webserver (C), which should send big files. My question is: What are the main differneces in two syscalls: write and sendfile. Does sendfile depends on size of socket system buffer ? I noticed that write often writes less then i requested. For example, if got many requests for one file: should i open it, copy into memory and use 'write', or maybe i can do 'sendfile' for each client ? thx in advance for all answers

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  • Spring HibernateTemplate: how it deals with transactions?

    - by EugeneP
    Could you explain, what happens behind the scene? Transaction management when using this template in Spring is absolutely unclear. What if I invoke 10 DAO methods that all use the same Hibernatetemplate and I invoke them one after another? Every method runs within its own transaction? It's not effective is not it?

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  • How to use prettify with blogger/blogspot?

    - by billpg
    Hi everyone. I'm using blogger.com to host some texts on programming, and I'd like to use prettify (same as stackoverflow) to nicely colour the code samples. How do I install the prettify scripts into the blog domain? Would it be better (if indeed its possible) to link to a shared copy somewhere? I have webspace on a different domain. Would that help? Many thanks.

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  • Design Patters in Rails

    - by Winston
    I remember, I have a GoF book back in college about design patterns which helped me a lot with my C and C++ programming, since my jump ship to Rails I was trying to use those design patterns I learned previously, Rails is a relatively new paradigm to me, plurals, verbs, REST, DRY.. Can you give me a recommended book for Rails that I can easily understand what I previously learned back in College. P.S. I suspect Matz knew about the GoF book, and applied it on Ruby... :-)

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  • What causes the error "Can't execute code from a freed script"

    - by tjrobinson
    I thought I'd found the solution a while ago (see my blog): If you ever get the JavaScript (or should that be JScript) error "Can't execute code from a freed script" - try moving any meta tags in the head so that they're before your script tags. ...but based on one of the most recent blog comments, the fix I suggested may not work for everyone. I thought this would be a good one to open up to the StackOverflow community.... What causes the error "Can't execute code from a freed script" and what are the solutions/workarounds?

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  • JSF Composite Component

    - by purecharger
    I'm trying to create a composite component for use in my Seam application, and I'm running into problems with the simplest "hello, world" component. I have placed a file named hello.xhtml in {jboss deploy}/application.ear/application.war/resources/greet : <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html" xmlns:composite="http://java.sun.com/jsf/composite"> <head> <title>My First Composite Component</title> </head> <body> <composite:interface> <composite:attribute name="who"/> </composite:interface> <composite:implementation> <h:outputText value="Hello, #{cc.attrs.who}!"/> </composite:implementation> </body> </html> Now in home.xhtml, located at the root of my webapp ({jboss deploy}/application.ear/application.war/home.xhtml): <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <ui:composition xmlns="http://www.w3.org/1999/xhtml" xmlns:ui="http://java.sun.com/jsf/facelets" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core" xmlns:g="http://java.sun.com/jsf/composite/greet" xmlns:s="http://jboss.com/products/seam/taglib" template="layout/template.xhtml"> <ui:define name="content"> <div id="content"> <g:hello who="World"/> <br/> </div> </ui:define> </ui:composition> But my "hello, world" is not displayed, and I dont get any error messages, even when I turn on debug level logging for com.sun and javax.faces categories. Any ideas?

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  • Passing local variables to Erlydtl block

    - by Justin
    Hi, I've got a block of erlydtl code which I use repeatedly and would like to abstract to some kind of block / partial template. The issue is that I need to pass the block a local variable. This is possible with Rails partial templates; it looks like it's possible with Django's blocks [albeit with some kind of Python hackery]; I'm wondering if it's possible with Erlydtl [Erlang implementation of Django templates] Ideas ? Thanks you.

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  • Succinct introduction to C++/CLI for C#/Haskell/F#/JS/C++/... programmer

    - by Henrik
    Hello everybody, I'm trying to write integrations with the operating system and with things like active directory and Ocropus. I know a bunch of programming languages, including those listed in the title. I'm trying to learn exactly how C++/CLI works, but can't find succinct, exact and accurate descriptions online from the searching that I have done. So I ask here. Could you tell me the pitfalls and features of C++/CLI? Assume I know all of C# and start from there. I'm not an expert in C++, so some of my questions' answers might be "just like C++", but could say that I am at C#. I would like to know things like: Converting C++ pointers to CLI pointers, Any differences in passing by value/doubly indirect pointers/CLI pointers from C#/C++ and what is 'recommended'. How do gcnew, __gc, __nogc work with Polymorphism Structs Inner classes Interfaces The "fixed" keyword; does that exist? Compiling DLLs loaded into the kernel with C++/CLI possible? Loaded as device drivers? Invoked by the kernel? What does this mean anyway (i.e. to load something into the kernel exactly; how do I know if it is?)? L"my string" versus "my string"? wchar_t? How many types of chars are there? Are we safe in treating chars as uint32s or what should one treat them as to guarantee language indifference in code? Finalizers (~ClassName() {}) are discouraged in C# because there are no garantuees they will run deterministically, but since in C++ I have to use "delete" or use copy-c'tors as to stack allocate memory, what are the recommendations between C#/C++ interactions? What are the pitfalls when using reflection in C++/CLI? How well does C++/CLI work with the IDisposable pattern and with SafeHandle, SafeHandleZeroOrMinusOneIsInvalid? I've read briefly about asynchronous exceptions when doing DMA-operations, what are these? Are there limitations you impose upon yourself when using C++ with CLI integration rather than just doing plain C++? Attributes in C++ similar to Attributes in C#? Can I use the full meta-programming patterns available in C++ through templates now and still have it compile like ordinary C++? Have you tried writing C++/CLI with boost? What are the optimal ways of interfacing the boost library with C++/CLI; can you give me an example of passing a lambda expression to an iterator/foldr function? What is the preferred way of exception handling? Can C++/CLI catch managed exceptions now? How well does dynamic IL generation work with C++/CLI? Does it run on Mono? Any other things I ought to know about?

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  • Succinct introduction to C++/CLI for C#/Haskell/F#/JS/C++/... programmer

    - by Henrik
    Hello everybody, I'm trying to write integrations with the operating system and with things like active directory and Ocropus. I know a bunch of programming languages, including those listed in the title. I'm trying to learn exactly how C++/CLI works, but can't find succinct, exact and accurate descriptions online from the searching that I have done. So I ask here. Could you tell me the pitfalls and features of C++/CLI? Assume I know all of C# and start from there. I'm not an expert in C++, so some of my questions' answers might be "just like C++", but could say that I am at C#. I would like to know things like: Converting C++ pointers to CLI pointers, Any differences in passing by value/doubly indirect pointers/CLI pointers from C#/C++ and what is 'recommended'. How do gcnew, __gc, __nogc work with Polymorphism Structs Inner classes Interfaces The "fixed" keyword; does that exist? Compiling DLLs loaded into the kernel with C++/CLI possible? Loaded as device drivers? Invoked by the kernel? What does this mean anyway (i.e. to load something into the kernel exactly; how do I know if it is?)? L"my string" versus "my string"? wchar_t? How many types of chars are there? Are we safe in treating chars as uint32s or what should one treat them as to guarantee language indifference in code? Finalizers (~ClassName() {}) are discouraged in C# because there are no garantuees they will run deterministically, but since in C++ I have to use "delete" or use copy-c'tors as to stack allocate memory, what are the recommendations between C#/C++ interactions? What are the pitfalls when using reflection in C++/CLI? How well does C++/CLI work with the IDisposable pattern and with SafeHandle, SafeHandleZeroOrMinusOneIsInvalid? I've read briefly about asynchronous exceptions when doing DMA-operations, what are these? Are there limitations you impose upon yourself when using C++ with CLI integration rather than just doing plain C++? Attributes in C++ similar to Attributes in C#? Can I use the full meta-programming patterns available in C++ through templates now and still have it compile like ordinary C++? Have you tried writing C++/CLI with boost? What are the optimal ways of interfacing the boost library with C++/CLI; can you give me an example of passing a lambda expression to an iterator/foldr function? What is the preferred way of exception handling? Can C++/CLI catch managed exceptions now? How well does dynamic IL generation work with C++/CLI? Does it run on Mono? Any other things I ought to know about?

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  • Dynamic Jasper Report

    - by pramod
    Hi, i need to create dynamic jasper report . my scenario is i have nearly 60 tables in database,so i can't create 60 jasper reports.i want a template jasper report which should be modified automatically by program.The data will come dynamically from the database and will be stored in an arraylist. iterating the arraylist i need to upload the data to jasper report. is that possible in java + jasper Reports. if so please give an example or any idea. thanks pramod

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  • Column variables in Excel?

    - by Ryan
    Let's say I have column A and Column B. Cells in Column A contain either "Y" or "N". How can I set the value of the cell in the corresponding row in Column B with a formula that detects if the cell's value = "N"? Not new to programming logic but to Excel formulas, thanks for your help. -Ryan

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  • How to reuse layouts in WPF

    - by Ingó Vals
    I'm trying to create a application that will be tabbed where each tab will have a button area and a view area. Now each tab will essentially have the same layout just different things in the layout and I wanted to be able to reuse the same layout so that I won't have to change at many places ( it's just not good programming ). Can I accomplish this using resources or perhaps Styles. Please supply a light code example if possible.

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  • translate database fields with rails

    - by fursie
    hi I know about the built-in I18n in Rails, but how can I select a database field per locale? My model structure is something like this: title #default (englisch) title_de #(german) title_it #(italian) In my template I want to be able to write only <%= @model.title %> and should get the value in the right language. Is there a plugin or a solution to use different fields per different locale settings with a structure like mine?

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  • Django: Prefill a ManytoManyField

    - by Emile Petrone
    I have a ManyToManyField on a settings page that isn't rendering. The data was filled when the user registered, and I am trying to prefill that data when the user tries to change it. Thanks in advance for the help! The HTML: {{form.types.label}} {% if add %} {{form.types}} {% else %} {% for type in form.types.all %} {{type.description}} {% endfor %} {% endif %} The View: @csrf_protect @login_required def edit_host(request, host_id, template_name="host/newhost.html"): host = get_object_or_404(Host, id=host_id) if request.user != host.user: return HttpResponseForbidden() form = HostForm(request.POST) if form.is_valid(): if request.method == 'POST': if form.cleaned_data.get('about') is not None: host.about = form.cleaned_data.get('about') if form.cleaned_data.get('types') is not None: host.types = form.cleaned_data.get('types') host.save() form.save_m2m() return HttpResponseRedirect('/users/%d/' % host.user.id) else: form = HostForm(initial={ "about":host.about, "types":host.types, }) data = { "host":host, "form":form } return render_to_response(template_name, data, context_instance=RequestContext(request)) Form: class HostForm(forms.ModelForm): class Meta: model = Host fields = ('types', 'about', ) types = forms.ModelMultipleChoiceField( widget=forms.CheckboxSelectMultiple, queryset=Type.objects.all(), required=True) about = forms.CharField( widget=forms.Textarea(), required=True) def __init__(self, *args, **kwargs): super(HostForm, self).__init__(*args, **kwargs) self.fields['about'].widget.attrs = { 'placeholder':'Hello!'}

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  • Text encoding in HTML text fields

    - by joe
    I have a site up that has a form on it. The form POSTs to a php script which then inserts the data into my database. The page has a charset=UTF-8 attribute in the <meta> tag, and the database is setup to use UTF-8. However, when I copy and paste characters from MS Word into the field, the output is messed up. For example, the quotes in I am using "Microsoft Word" '''' become I am using “Microsoft Word†???? in the database. Anyone have any idea why this might occur?

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