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  • Vehicle Make/Model and Parts Database

    - by Jas Panesar
    I am looking to see if there is a web based service I can either access programmatically to access teh following information, or a database I could purchase or interface with. I am looking to see if there are databases out there for: 1) Vehicle makes and models -- I recall something being out there in the $500/yr range 2) Vehicle Part Numbers - A database of car part numbers that is maintained and updated for a yearly subscription. I had read something similar about databases being purchased for other industries on SO.. so I figure this is fair game. Thanks in advance!

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  • PHP OOP: Avoid Singleton/Static Methods in Domain Model Pattern

    - by sunwukung
    I understand the importance of Dependency Injection and its role in Unit testing, which is why the following issue is giving me pause: One area where I struggle not to use the Singleton is the Identity Map/Unit of Work pattern (Which keeps tabs on Domain Object state). //Not actual code, but it should demonstrate the point class Monitor{//singleton construction omitted for brevity static $members = array();//keeps record of all objects static $dirty = array();//keeps record of all modified objects static $clean = array();//keeps record of all clean objects } class Mapper{//queries database, maps values to object fields public function find($id){ if(isset(Monitor::members[$id]){ return Monitor::members[$id]; } $values = $this->selectStmt($id); //field mapping process omitted for brevity $Object = new Object($values); Monitor::new[$id]=$Object return $Object; } $User = $UserMapper->find(1);//domain object is registered in Id Map $User->changePropertyX();//object is marked "dirty" in UoW // at this point, I can save by passing the Domain Object back to the Mapper $UserMapper->save($User);//object is marked clean in UoW //but a nicer API would be something like this $User->save(); //but if I want to do this - it has to make a call to the mapper/db somehow $User->getBlogPosts(); //or else have to generate specific collection/object graphing methods in the mapper $UserPosts = $UserMapper->getBlogPosts(); $User->setPosts($UserPosts); Any advice on how you might handle this situation? I would be loathe to pass/generate instances of the mapper/database access into the Domain Object itself to satisfy DI - At the same time, avoiding that results in lots of calls within the Domain Object to external static methods. Although I guess if I want "save" to be part of its behaviour then a facility to do so is required in its construction. Perhaps it's a problem with responsibility, the Domain Object shouldn't be burdened with saving. It's just quite a neat feature from the Active Record pattern - it would be nice to implement it in some way.

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  • Multiple has_many's of the same model

    - by Koning Baard
    I have these models: Person has_many :messages_form_person, :foreign_key => :from_user_id, :class_name => :messages has_many :messages_to_person, :foreign_key => :to_user_id, :class_name => :messages Message belongs_to :to_person, :foreign_key => :to_user_id, :class_name => :person belongs_to :from_person, :foreign_key => :to_user_id, :class_name => :person And this view: person#show <% @person.messages_to_person.each do |message| %> <%=h message.title %> <% end %> But I get this error: TypeError in People#show Showing app/views/people/show.html.erb where line #26 raised: can't convert Symbol into String Extracted source (around line #26): 23: <%=h @person.biography %> 24: </p> 25: 26: <% @person.messages_to_person.each do |message| %> 27: 28: <% end %> 29: I basicly want that people can send eachother messages. Can anyone help me? Thanks.

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  • Can't send flash message from Model method

    - by Andy
    Hello, I'm trying to prevent a record that has a relationship to another record from being deleted. I can stop the deletion but not send a flash message as I had hoped! class Purchaseitem < ActiveRecord::Base before_destroy :check_if_ingredient ... def check_if_ingredient i = Ingredient.find(:all, :conditions => "purchaseitem_id = #{self.id}") if i.length > 0 self.errors.add(:name) flash.now[:notice] = "#{self.name} is in use as an ingredient and cannot be deleted" return false end end This will prevent a the delete wihthout the flash line, and when I add it I get: undefined local variable or method `flash' for # Any help would be much appreciated!

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  • Looking for substantial open source GWT/App-Engine project to use as reference

    - by tempy
    I'm working on GAE-J/GWT app, wherein a desktop app connects to the GAE-J component, and there is also a web-app component whose front-end is written in GWT, and the GAE-J backend supports both the desktop app and the web app. I have a good amount of experience with writing pure server code and desktop code, but not so much on the web-app side of things. So I'm looking to study some good sophisticated open source code to see how other's have done things, but I can't find much open source GWT and/or GAE-J stuff, other than frameworks. Does anyone know of any good projects out there?

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  • Using a model to represent the overall state of a view

    - by James P.
    Is there a standard practise for representing the state of a user interface that is not linked to a single Component? For example, a Swing interface could have a series of tabs with a constraint that a single tab should only be displayed once per a given entity type (this could be represented as a HashSet). Or a message could give the result of the last operation carried out. Or a JPanel could be linked to a single entity instance for editing purposes.

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  • Model self referential collections in Rails

    - by Najitaka
    I have written an application for an online clothing store in Rails 2.3.5. I want to show related Products when a customer views the Product Detail page. For example, if the customer views the detail page for a suit, I'd like to display the accessory products that match the dress such as a vest, shoes, and belt. I have named the related products an Ensemble. However, the vest, shoes, and belts are also Products which is what has me struggling. I have it working as follows but I know it's not the Rails way. I have a Products table for all of the products. Not important here but I also have a ProductDetails table. I have an Ensembles table that has the following columns: product_id - the main or origination product, the one displayed on the detail page outfit_id - the related or accessory product In setting up the data, on the Products list, for each Product I have an Ensemble link. This link takes you to the index action in the Ensembles controller. Using the id from the "main" Product, I find all of the associated Ensemble rows by product_id or I create a new ensemble and assign the id from the main product as the product_id. I'd like to just be able to do @product.related_products to get an Ensemble collection. Also on the index page I list the columns of the main product so the user can be sure their main product was the one they selected from the list. I also have a select list of the other products, with an Add to Ensemble action. Finally on the same index page, I have a table that displays the products that are already in the ensemble and in that list each row has a destroy link to remove a particular product from the ensemble. It would be nice if given a single Ensemble row @ensemble I could do @ensemble.product to get the Product related to the outfit_id of the ensemble row. I've got it working without associations but I have to run queries in the controller to build my own @product, @ensemble, and @ensembles collections. Also the only way I found to destroy an ensemble row is by Ensemble.connection.delete(sql to delete), simple @ensemble.destroy doesn't work. Anyone know how I would set up the associations or have a link to a site explaining a similar setup. None of the examples I found use the same table. They have A related to B through C. I want A related to other A through B.

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  • How to clone a model's attributes easily?

    - by Zabba
    I have these models: class Address < ActiveRecord::Base belongs_to :event attr_accessible :street, :city validates :street, :city, :presence => true end class Event < ActiveRecord::Base has_one :address accepts_nested_attributes_for :address end If I do the below assignment in the Events create action and save the event I get an error: #Use the current user's address for the event @event.address_attributes = current_user.address.attributes #Error occurs at the above mentioned line ActiveRecord::RecordNotFound (Couldn't find Address with ID=1 for Event with ID=) I think what's happening is that all the address's attributes (including the primary key) is getting assigned in the @event.address_attributes = line. But all I really want is the "real data" (street, city), not the primary keys or created_at etc to get copied over. I suppose I could write a small method to do this sort of selective copy but I can't help but feel there must be some built-in method for this? What's the best/right way to do this?

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  • Can i use a model object directly in a find

    - by user340100
    Hi, Can i pass a_teacher directly into the find? or do i have to compare each of its attributes as i have done here? thanks a_teacher = Techer.new(:name => "Bob", :age => 30) self.classes.all(:conditions => ["teacher.name = ? AND teacher.age = ?", a_teacher.name,a_teacher.age], :joins => :teacher)

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  • FireFox Toolbar Open Window in new Tab

    - by Mark
    Hi all, I have a Toolbarbutton <toolbarbutton context="TabMenue" id="esbTb_rss_reader" label="News" type="menu"> with a Context menue which comes up when the button is right clickt <menupopup id="TabMenue" > <menuitem label="New Tab" oncommand="esbTb_loadURLNewTab()"/> </menupopup> so this function should open the new window in a new tab function esbTb_loadURLNewTab() { window.open(ClickUrl,'name'); } I don't get it working that the new Window is showing up in a new tab it always opens a new firefox window. I tried also like described in this article to set the browser.link.open_newwindow and browser.link.open_newwindow.restriction preferences but that doesn't bringt anything. And I tried it with all Target attributes which came in my mind. So I'm grateful for any hints, tips what ever this is driving me crazy...

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  • MVC 4 Controller Compilation Error trying to return a Model

    - by Joe
    This is a newbie configuration problem I suspect. See return statement comment in code snippet. [HttpGet] public ActionResult TestService() { ViewBag.Message = "DataLayer Service"; Service dataLayerService = new Service {CookieContainer = new CookieContainer()}; dataLayerService.SetSessionAppName("SAND"); WebServiceModel webServiceModel = new WebServiceModel(); webServiceModel.Result = dataLayerService.GetSessionAppName(); return this.View(webServiceModel); // <== Cannot resolve View "TestService" }

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  • Pulseaudio is no longer working in Debian Squeeze: 'Failed to open module "module-combine-sink": file not found'

    - by mattalexx
    I'm having a problem with pulseaudio. My machine crashed, and when I rebooted and ran pavucontrol, I got a "Connection Failed: Connection refused" dialog. When I run pulseaudio --log-level=info --log-target=stderr from the command line, I get the following output: [...] I: alsa-util.c: Error opening PCM device front:1: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC1D0c' failed (-2) I: alsa-util.c: Error opening PCM device hw:1: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC1D0c' failed (-2) I: alsa-util.c: Error opening PCM device iec958:1: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC1D0c' failed (-2) I: alsa-util.c: Error opening PCM device iec958:1: No such file or directory I: alsa-util.c: Failed to set hardware parameters on plug:iec958:1: Invalid argument I: alsa-util.c: Failed to set hardware parameters on plug:iec958:1: Invalid argument I: alsa-util.c: Failed to set hardware parameters on plug:iec958:1: Invalid argument I: alsa-util.c: Failed to set hardware parameters on plug:iec958:1: Invalid argument I: alsa-util.c: Failed to set hardware parameters on plug:iec958:1: Invalid argument I: (alsa-lib)pcm.c: Unknown PCM a52:1 I: alsa-util.c: Error opening PCM device a52:1: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM a52:1 I: alsa-util.c: Error opening PCM device a52:1: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM a52:1 I: alsa-util.c: Error opening PCM device a52:1: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM a52:1 I: alsa-util.c: Error opening PCM device a52:1: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM a52:1 I: alsa-util.c: Error opening PCM device a52:1: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM a52:1 I: alsa-util.c: Error opening PCM device a52:1: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM a52:1 I: alsa-util.c: Error opening PCM device a52:1: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM a52:1 I: alsa-util.c: Error opening PCM device a52:1: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM a52:1 I: alsa-util.c: Error opening PCM device a52:1: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM a52:1 I: alsa-util.c: Error opening PCM device a52:1: No such file or directory I: (alsa-lib)confmisc.c: Unable to find definition 'cards.USB-Audio.pcm.hdmi.0:CARD=1,AES0=4,AES1=130,AES2=0,AES3=2' I: (alsa-lib)conf.c: function snd_func_refer returned error: No such file or directory I: (alsa-lib)conf.c: Evaluate error: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM hdmi:1 I: alsa-util.c: Error opening PCM device hdmi:1: No such file or directory I: (alsa-lib)confmisc.c: Unable to find definition 'cards.USB-Audio.pcm.hdmi.0:CARD=1,AES0=4,AES1=130,AES2=0,AES3=2' I: (alsa-lib)conf.c: function snd_func_refer returned error: No such file or directory I: (alsa-lib)conf.c: Evaluate error: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM hdmi:1 I: alsa-util.c: Error opening PCM device hdmi:1: No such file or directory I: (alsa-lib)confmisc.c: Unable to find definition 'cards.USB-Audio.pcm.hdmi.0:CARD=1,AES0=4,AES1=130,AES2=0,AES3=2' I: (alsa-lib)conf.c: function snd_func_refer returned error: No such file or directory I: (alsa-lib)conf.c: Evaluate error: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM hdmi:1 I: alsa-util.c: Error opening PCM device hdmi:1: No such file or directory I: (alsa-lib)confmisc.c: Unable to find definition 'cards.USB-Audio.pcm.hdmi.0:CARD=1,AES0=4,AES1=130,AES2=0,AES3=2' I: (alsa-lib)conf.c: function snd_func_refer returned error: No such file or directory I: (alsa-lib)conf.c: Evaluate error: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM hdmi:1 I: alsa-util.c: Error opening PCM device hdmi:1: No such file or directory I: (alsa-lib)confmisc.c: Unable to find definition 'cards.USB-Audio.pcm.hdmi.0:CARD=1,AES0=4,AES1=130,AES2=0,AES3=2' I: (alsa-lib)conf.c: function snd_func_refer returned error: No such file or directory I: (alsa-lib)conf.c: Evaluate error: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM hdmi:1 I: alsa-util.c: Error opening PCM device hdmi:1: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC1D0c' failed (-2) I: alsa-util.c: Error opening PCM device hw:1: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC1D0c' failed (-2) I: alsa-util.c: Error opening PCM device front:1: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC1D0c' failed (-2) I: alsa-util.c: Error opening PCM device hw:1: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC1D0c' failed (-2) I: alsa-util.c: Error opening PCM device iec958:1: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC1D0c' failed (-2) I: alsa-util.c: Error opening PCM device iec958:1: No such file or directory I: card.c: Created 0 "alsa_card.usb-FiiO_DigiHug_USB_Audio-01-Audio" I: alsa-sink.c: Successfully opened device front:1. I: alsa-sink.c: Selected mapping 'Analog Stereo' (analog-stereo). I: alsa-sink.c: Successfully enabled mmap() mode. I: alsa-sink.c: Successfully enabled timer-based scheduling mode. I: (alsa-lib)control.c: Invalid CTL front:1 I: alsa-mixer.c: Unable to attach to mixer front:1: No such file or directory I: alsa-mixer.c: Successfully attached to mixer 'hw:1' W: alsa-mixer.c: Your kernel driver is broken: it reports a volume range from 0.00 dB to 0.00 dB which makes no sense. I: module-device-restore.c: Restoring volume for sink alsa_output.usb-FiiO_DigiHug_USB_Audio-01-Audio.analog-stereo. I: sink.c: Created sink 0 "alsa_output.usb-FiiO_DigiHug_USB_Audio-01-Audio.analog-stereo" with sample spec s16le 2ch 44100Hz and channel map front-left,front-right I: sink.c: alsa.resolution_bits = "16" I: sink.c: device.api = "alsa" I: sink.c: device.class = "sound" I: sink.c: alsa.class = "generic" I: sink.c: alsa.subclass = "generic-mix" I: sink.c: alsa.name = "USB Audio" I: sink.c: alsa.id = "USB Audio" I: sink.c: alsa.subdevice = "0" I: sink.c: alsa.subdevice_name = "subdevice #0" I: sink.c: alsa.device = "0" I: sink.c: alsa.card = "1" I: sink.c: alsa.card_name = "DigiHug USB Audio" I: sink.c: alsa.long_card_name = "FiiO DigiHug USB Audio at usb-0000:00:1a.0-1.2, full speed" I: sink.c: alsa.driver_name = "snd_usb_audio" I: sink.c: device.bus_path = "pci-0000:00:1a.0-usb-0:1.2:1.1" I: sink.c: sysfs.path = "/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.1/sound/card1" I: sink.c: udev.id = "usb-FiiO_DigiHug_USB_Audio-01-Audio" I: sink.c: device.bus = "usb" I: sink.c: device.vendor.id = "1852" I: sink.c: device.vendor.name = "GYROCOM C&C Co., LTD" I: sink.c: device.product.id = "7022" I: sink.c: device.product.name = "DigiHug_USB_Audio" I: sink.c: device.serial = "FiiO_DigiHug_USB_Audio" I: sink.c: device.string = "front:1" I: sink.c: device.buffering.buffer_size = "352800" I: sink.c: device.buffering.fragment_size = "176400" I: sink.c: device.access_mode = "mmap+timer" I: sink.c: device.profile.name = "analog-stereo" I: sink.c: device.profile.description = "Analog Stereo" I: sink.c: device.description = "DigiHug_USB_Audio Analog Stereo" I: sink.c: alsa.mixer_name = "USB Mixer" I: sink.c: alsa.components = "USB1852:7022" I: sink.c: module-udev-detect.discovered = "1" I: sink.c: device.icon_name = "audio-card-usb" I: source.c: Created source 0 "alsa_output.usb-FiiO_DigiHug_USB_Audio-01-Audio.analog-stereo.monitor" with sample spec s16le 2ch 44100Hz and channel map front-left,front-right I: source.c: device.description = "Monitor of DigiHug_USB_Audio Analog Stereo" I: source.c: device.class = "monitor" I: source.c: alsa.card = "1" I: source.c: alsa.card_name = "DigiHug USB Audio" I: source.c: alsa.long_card_name = "FiiO DigiHug USB Audio at usb-0000:00:1a.0-1.2, full speed" I: source.c: alsa.driver_name = "snd_usb_audio" I: source.c: device.bus_path = "pci-0000:00:1a.0-usb-0:1.2:1.1" I: source.c: sysfs.path = "/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.1/sound/card1" I: source.c: udev.id = "usb-FiiO_DigiHug_USB_Audio-01-Audio" I: source.c: device.bus = "usb" I: source.c: device.vendor.id = "1852" I: source.c: device.vendor.name = "GYROCOM C&C Co., LTD" I: source.c: device.product.id = "7022" I: source.c: device.product.name = "DigiHug_USB_Audio" I: source.c: device.serial = "FiiO_DigiHug_USB_Audio" I: source.c: device.string = "1" I: source.c: module-udev-detect.discovered = "1" I: source.c: device.icon_name = "audio-card-usb" I: alsa-sink.c: Using 2.0 fragments of size 176400 bytes (1000.00ms), buffer size is 352800 bytes (2000.00ms) I: alsa-sink.c: Time scheduling watermark is 20.00ms I: alsa-sink.c: Hardware volume ranges from 0 to 110. I: alsa-sink.c: Using hardware volume control. Hardware dB scale not supported. I: alsa-sink.c: Using hardware mute control. I: core-util.c: Successfully enabled SCHED_RR scheduling for thread, with priority 5. I: alsa-sink.c: Starting playback. I: module.c: Loaded "module-alsa-card" (index: #4; argument: "device_id="1" name="usb-FiiO_DigiHug_USB_Audio-01-Audio" card_name="alsa_card.usb-FiiO_DigiHug_USB_Audio-01-Audio" tsched=yes ignore_dB=no card_properties="module-udev-detect.discovered=1""). I: module-udev-detect.c: Card /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2:1.1/sound/card1 (alsa_card.usb-FiiO_DigiHug_USB_Audio-01-Audio) module loaded. I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device hw:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device hw:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device hw:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device hw:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device hw:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device front:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device hw:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device front:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device hw:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device front:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device hw:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device front:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device hw:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device front:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device hw:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround40:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround40:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround40:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround40:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround40:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround41:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround41:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround41:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround41:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround41:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround50:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround50:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround50:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround50:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround50:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround51:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround51:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround51:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround51:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround51:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround71:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround71:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround71:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround71:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device surround71:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device iec958:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device iec958:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device iec958:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device iec958:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device iec958:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device iec958:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device iec958:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device iec958:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device iec958:2: No such file or directory I: (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC2D0p' failed (-2) I: alsa-util.c: Error opening PCM device iec958:2: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM a52:2 I: alsa-util.c: Error opening PCM device a52:2: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM a52:2 I: alsa-util.c: Error opening PCM device a52:2: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM a52:2 I: alsa-util.c: Error opening PCM device a52:2: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM a52:2 I: alsa-util.c: Error opening PCM device a52:2: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM a52:2 I: alsa-util.c: Error opening PCM device a52:2: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM a52:2 I: alsa-util.c: Error opening PCM device a52:2: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM a52:2 I: alsa-util.c: Error opening PCM device a52:2: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM a52:2 I: alsa-util.c: Error opening PCM device a52:2: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM a52:2 I: alsa-util.c: Error opening PCM device a52:2: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM a52:2 I: alsa-util.c: Error opening PCM device a52:2: No such file or directory I: (alsa-lib)confmisc.c: Unable to find definition 'cards.USB-Audio.pcm.hdmi.0:CARD=2,AES0=4,AES1=130,AES2=0,AES3=2' I: (alsa-lib)conf.c: function snd_func_refer returned error: No such file or directory I: (alsa-lib)conf.c: Evaluate error: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM hdmi:2 I: alsa-util.c: Error opening PCM device hdmi:2: No such file or directory I: (alsa-lib)confmisc.c: Unable to find definition 'cards.USB-Audio.pcm.hdmi.0:CARD=2,AES0=4,AES1=130,AES2=0,AES3=2' I: (alsa-lib)conf.c: function snd_func_refer returned error: No such file or directory I: (alsa-lib)conf.c: Evaluate error: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM hdmi:2 I: alsa-util.c: Error opening PCM device hdmi:2: No such file or directory I: (alsa-lib)confmisc.c: Unable to find definition 'cards.USB-Audio.pcm.hdmi.0:CARD=2,AES0=4,AES1=130,AES2=0,AES3=2' I: (alsa-lib)conf.c: function snd_func_refer returned error: No such file or directory I: (alsa-lib)conf.c: Evaluate error: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM hdmi:2 I: alsa-util.c: Error opening PCM device hdmi:2: No such file or directory I: (alsa-lib)confmisc.c: Unable to find definition 'cards.USB-Audio.pcm.hdmi.0:CARD=2,AES0=4,AES1=130,AES2=0,AES3=2' I: (alsa-lib)conf.c: function snd_func_refer returned error: No such file or directory I: (alsa-lib)conf.c: Evaluate error: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM hdmi:2 I: alsa-util.c: Error opening PCM device hdmi:2: No such file or directory I: (alsa-lib)confmisc.c: Unable to find definition 'cards.USB-Audio.pcm.hdmi.0:CARD=2,AES0=4,AES1=130,AES2=0,AES3=2' I: (alsa-lib)conf.c: function snd_func_refer returned error: No such file or directory I: (alsa-lib)conf.c: Evaluate error: No such file or directory I: (alsa-lib)pcm.c: Unknown PCM hdmi:2 I: alsa-util.c: Error opening PCM device hdmi:2: No such file or directory I: alsa-util.c: Device hw:2 doesn't support 44100 Hz, changed to 8000 Hz. I: alsa-util.c: Failed to set hardware parameters on plug:front:2: Invalid argument I: alsa-util.c: Failed to set hardware parameters on plug:hw:2: Invalid argument I: alsa-util.c: Failed to set hardware parameters on plug:iec958:2: Invalid argument I: alsa-util.c: Failed to set hardware parameters on plug:iec958:2: Invalid argument I: module-card-restore.c: Restoring profile for card alsa_card.usb-046d_08d7-01-U0x46d0x8d7. I: card.c: Created 1 "alsa_card.usb-046d_08d7-01-U0x46d0x8d7" I: module.c: Loaded "module-alsa-card" (index: #5; argument: "device_id="2" name="usb-046d_08d7-01-U0x46d0x8d7" card_name="alsa_card.usb-046d_08d7-01-U0x46d0x8d7" tsched=yes ignore_dB=no card_properties="module-udev-detect.discovered=1""). I: module-udev-detect.c: Card /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.6/1-1.6:1.1/sound/card2 (alsa_card.usb-046d_08d7-01-U0x46d0x8d7) module loaded. I: module-udev-detect.c: Found 3 cards. I: module.c: Loaded "module-udev-detect" (index: #6; argument: ""). I: module.c: Loaded "module-esound-protocol-unix" (index: #7; argument: ""). I: module.c: Loaded "module-native-protocol-unix" (index: #8; argument: ""). I: module-default-device-restore.c: Saved default sink 'alsa_output.pci-0000_00_1b.0.analog-surround-41' not existant, not restoring default sink setting. I: module-default-device-restore.c: Saved default source 'alsa_output.pci-0000_00_1b.0.analog-surround-41.monitor' not existant, not restoring default source setting. I: module.c: Loaded "module-default-device-restore" (index: #9; argument: ""). I: module.c: Loaded "module-rescue-streams" (index: #10; argument: ""). I: module.c: Loaded "module-always-sink" (index: #11; argument: ""). I: module.c: Loaded "module-intended-roles" (index: #12; argument: ""). I: module.c: Loaded "module-suspend-on-idle" (index: #13; argument: ""). I: client.c: Created 0 "ConsoleKit Session /org/freedesktop/ConsoleKit/Session2" I: module.c: Loaded "module-console-kit" (index: #14; argument: ""). I: module.c: Loaded "module-position-event-sounds" (index: #15; argument: ""). I: module.c: Loaded "module-cork-music-on-phone" (index: #16; argument: ""). E: module.c: Failed to open module "module-combine-sink": file not found E: main.c: Module load failed. E: main.c: Failed to initialize daemon. I: module.c: Unloading "module-device-restore" (index: #0). I: module.c: Unloaded "module-device-restore" (index: #0). I: module.c: Unloading "module-stream-restore" (index: #1). I: module.c: Unloaded "module-stream-restore" (index: #1). I: module.c: Unloading "module-card-restore" (index: #2). I: module.c: Unloaded "module-card-restore" (index: #2). I: module.c: Unloading "module-augment-properties" (index: #3). I: module.c: Unloaded "module-augment-properties" (index: #3). I: module.c: Unloading "module-alsa-card" (index: #4). I: sink.c: Freeing sink 0 "alsa_output.usb-FiiO_DigiHug_USB_Audio-01-Audio.analog-stereo" I: source.c: Freeing source 0 "alsa_output.usb-FiiO_DigiHug_USB_Audio-01-Audio.analog-stereo.monitor" I: card.c: Freed 0 "alsa_card.usb-FiiO_DigiHug_USB_Audio-01-Audio" I: module.c: Unloaded "module-alsa-card" (index: #4). I: module.c: Unloading "module-alsa-card" (index: #5). I: card.c: Freed 1 "alsa_card.usb-046d_08d7-01-U0x46d0x8d7" I: module.c: Unloaded "module-alsa-card" (index: #5). I: module.c: Unloading "module-udev-detect" (index: #6). I: module.c: Unloaded "module-udev-detect" (index: #6). I: module.c: Unloading "module-esound-protocol-unix" (index: #7). I: module.c: Unloaded "module-esound-protocol-unix" (index: #7). I: module.c: Unloading "module-native-protocol-unix" (index: #8). I: module.c: Unloaded "module-native-protocol-unix" (index: #8). I: module.c: Unloading "module-default-device-restore" (index: #9). I: module.c: Unloaded "module-default-device-restore" (index: #9). I: module.c: Unloading "module-rescue-streams" (index: #10). I: module.c: Unloaded "module-rescue-streams" (index: #10). I: module.c: Unloading "module-always-sink" (index: #11). I: module.c: Unloaded "module-always-sink" (index: #11). I: module.c: Unloading "module-intended-roles" (index: #12). I: module.c: Unloaded "module-intended-roles" (index: #12). I: module.c: Unloading "module-suspend-on-idle" (index: #13). I: module.c: Unloaded "module-suspend-on-idle" (index: #13). I: module.c: Unloading "module-console-kit" (index: #14). I: client.c: Freed 0 "ConsoleKit Session /org/freedesktop/ConsoleKit/Session2" I: module.c: Unloaded "module-console-kit" (index: #14). I: module.c: Unloading "module-position-event-sounds" (index: #15). I: module.c: Unloaded "module-position-event-sounds" (index: #15). I: module.c: Unloading "module-cork-music-on-phone" (index: #16). I: module.c: Unloaded "module-cork-music-on-phone" (index: #16). I: main.c: Daemon terminated. I believe the relevant part is this: E: module.c: Failed to open module "module-combine-sink": file not found E: main.c: Module load failed. E: main.c: Failed to initialize daemon. I tried uninstalling and reinstalling pulseaudio, I tried to find a way to install module-combine-sink. Nothing worked. I'm on a Debian Squeeze 32-bit machine. What can I do to fix this?

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  • OpenSource Projects - Is there a site which lists projecs that need more developers?

    - by Jamie
    Morning/Afternoon/Evening all, Do any of you know of a website which lists opensource projects which are in need of more help? Let me elaborate, I would like to work on another open source project (I already work on a couple), however, it would be nice to have a site which lists lots of OS projects, their aims, deadlines, workload, how many more developers they are in need of etc. Of course, I could just pick a topic i'm interested in, find an OS project and then work on it, however, it would be nice to see a diversified list of projects. Primarily because some little known awesome projects get little attention and big projects such as jQuery forks, adium, gimp etc. etc. get a lot of attention because they are well known (and of course because they are great)and thus get a lot of developers working on them. It would be nice to see some little known projects getting more attention and thus hopefully drawing some people to work on them. Currently there are many websites hosting os projects, such as github, sourceforge, google code etc. A website to centralise all of this into one place and categorise it would be awesome. Let me know your thoughts please. I'm not looking for an answer per se, so I will mark it is as a community wiki. Your thoughts would be great.

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  • VS 2010 SP1 and SQL CE

    - by ScottGu
    Last month we released the Beta of VS 2010 Service Pack 1 (SP1).  You can learn more about the VS 2010 SP1 Beta from Jason Zander’s two blog posts about it, and from Scott Hanselman’s blog post that covers some of the new capabilities enabled with it.   You can download and install the VS 2010 SP1 Beta here. Last week I blogged about the new Visual Studio support for IIS Express that we are adding with VS 2010 SP1. In today’s post I’m going to talk about the new VS 2010 SP1 tooling support for SQL CE, and walkthrough some of the cool scenarios it enables.  SQL CE – What is it and why should you care? SQL CE is a free, embedded, database engine that enables easy database storage. No Database Installation Required SQL CE does not require you to run a setup or install a database server in order to use it.  You can simply copy the SQL CE binaries into the \bin directory of your ASP.NET application, and then your web application can use it as a database engine.  No setup or extra security permissions are required for it to run. You do not need to have an administrator account on the machine. Just copy your web application onto any server and it will work. This is true even of medium-trust applications running in a web hosting environment. SQL CE runs in-memory within your ASP.NET application and will start-up when you first access a SQL CE database, and will automatically shutdown when your application is unloaded.  SQL CE databases are stored as files that live within the \App_Data folder of your ASP.NET Applications. Works with Existing Data APIs SQL CE 4 works with existing .NET-based data APIs, and supports a SQL Server compatible query syntax.  This means you can use existing data APIs like ADO.NET, as well as use higher-level ORMs like Entity Framework and NHibernate with SQL CE.  This enables you to use the same data programming skills and data APIs you know today. Supports Development, Testing and Production Scenarios SQL CE can be used for development scenarios, testing scenarios, and light production usage scenarios.  With the SQL CE 4 release we’ve done the engineering work to ensure that SQL CE won’t crash or deadlock when used in a multi-threaded server scenario (like ASP.NET).  This is a big change from previous releases of SQL CE – which were designed for client-only scenarios and which explicitly blocked running in web-server environments.  Starting with SQL CE 4 you can use it in a web-server as well. There are no license restrictions with SQL CE.  It is also totally free. Easy Migration to SQL Server SQL CE is an embedded database – which makes it ideal for development, testing, and light-usage scenarios.  For high-volume sites and applications you’ll probably want to migrate your database to use SQL Server Express (which is free), SQL Server or SQL Azure.  These servers enable much better scalability, more development features (including features like Stored Procedures – which aren’t supported with SQL CE), as well as more advanced data management capabilities. We’ll ship migration tools that enable you to optionally take SQL CE databases and easily upgrade them to use SQL Server Express, SQL Server, or SQL Azure.  You will not need to change your code when upgrading a SQL CE database to SQL Server or SQL Azure.  Our goal is to enable you to be able to simply change the database connection string in your web.config file and have your application just work. New Tooling Support for SQL CE in VS 2010 SP1 VS 2010 SP1 includes much improved tooling support for SQL CE, and adds support for using SQL CE within ASP.NET projects for the first time.  With VS 2010 SP1 you can now: Create new SQL CE Databases Edit and Modify SQL CE Database Schema and Indexes Populate SQL CE Databases within Data Use the Entity Framework (EF) designer to create model layers against SQL CE databases Use EF Code First to define model layers in code, then create a SQL CE database from them, and optionally edit the DB with VS Deploy SQL CE databases to remote servers using Web Deploy and optionally convert them to full SQL Server databases You can take advantage of all of the above features from within both ASP.NET Web Forms and ASP.NET MVC based projects. Download You can enable SQL CE tooling support within VS 2010 by first installing VS 2010 SP1 (beta). Once SP1 is installed, you’ll also then need to install the SQL CE Tools for Visual Studio download.  This is a separate download that enables the SQL CE tooling support for VS 2010 SP1. Walkthrough of Two Scenarios In this blog post I’m going to walkthrough how you can take advantage of SQL CE and VS 2010 SP1 using both an ASP.NET Web Forms and an ASP.NET MVC based application. Specifically, we’ll walkthrough: How to create a SQL CE database using VS 2010 SP1, then use the EF4 visual designers in Visual Studio to construct a model layer from it, and then display and edit the data using an ASP.NET GridView control. How to use an EF Code First approach to define a model layer using POCO classes and then have EF Code-First “auto-create” a SQL CE database for us based on our model classes.  We’ll then look at how we can use the new VS 2010 SP1 support for SQL CE to inspect the database that was created, populate it with data, and later make schema changes to it.  We’ll do all this within the context of an ASP.NET MVC based application. You can follow the two walkthroughs below on your own machine by installing VS 2010 SP1 (beta) and then installing the SQL CE Tools for Visual Studio download (which is a separate download that enables SQL CE tooling support for VS 2010 SP1). Walkthrough 1: Create a SQL CE Database, Create EF Model Classes, Edit the Data with a GridView This first walkthrough will demonstrate how to create and define a SQL CE database within an ASP.NET Web Form application.  We’ll then build an EF model layer for it and use that model layer to enable data editing scenarios with an <asp:GridView> control. Step 1: Create a new ASP.NET Web Forms Project We’ll begin by using the File->New Project menu command within Visual Studio to create a new ASP.NET Web Forms project.  We’ll use the “ASP.NET Web Application” project template option so that it has a default UI skin implemented: Step 2: Create a SQL CE Database Right click on the “App_Data” folder within the created project and choose the “Add->New Item” menu command: This will bring up the “Add Item” dialog box.  Select the “SQL Server Compact 4.0 Local Database” item (new in VS 2010 SP1) and name the database file to create “Store.sdf”: Note that SQL CE database files have a .sdf filename extension. Place them within the /App_Data folder of your ASP.NET application to enable easy deployment. When we clicked the “Add” button above a Store.sdf file was added to our project: Step 3: Adding a “Products” Table Double-clicking the “Store.sdf” database file will open it up within the Server Explorer tab.  Since it is a new database there are no tables within it: Right click on the “Tables” icon and choose the “Create Table” menu command to create a new database table.  We’ll name the new table “Products” and add 4 columns to it.  We’ll mark the first column as a primary key (and make it an identify column so that its value will automatically increment with each new row): When we click “ok” our new Products table will be created in the SQL CE database. Step 4: Populate with Data Once our Products table is created it will show up within the Server Explorer.  We can right-click it and choose the “Show Table Data” menu command to edit its data: Let’s add a few sample rows of data to it: Step 5: Create an EF Model Layer We have a SQL CE database with some data in it – let’s now create an EF Model Layer that will provide a way for us to easily query and update data within it. Let’s right-click on our project and choose the “Add->New Item” menu command.  This will bring up the “Add New Item” dialog – select the “ADO.NET Entity Data Model” item within it and name it “Store.edmx” This will add a new Store.edmx item to our solution explorer and launch a wizard that allows us to quickly create an EF model: Select the “Generate From Database” option above and click next.  Choose to use the Store.sdf SQL CE database we just created and then click next again.  The wizard will then ask you what database objects you want to import into your model.  Let’s choose to import the “Products” table we created earlier: When we click the “Finish” button Visual Studio will open up the EF designer.  It will have a Product entity already on it that maps to the “Products” table within our SQL CE database: The VS 2010 SP1 EF designer works exactly the same with SQL CE as it does already with SQL Server and SQL Express.  The Product entity above will be persisted as a class (called “Product”) that we can programmatically work against within our ASP.NET application. Step 6: Compile the Project Before using your model layer you’ll need to build your project.  Do a Ctrl+Shift+B to compile the project, or use the Build->Build Solution menu command. Step 7: Create a Page that Uses our EF Model Layer Let’s now create a simple ASP.NET Web Form that contains a GridView control that we can use to display and edit the our Products data (via the EF Model Layer we just created). Right-click on the project and choose the Add->New Item command.  Select the “Web Form from Master Page” item template, and name the page you create “Products.aspx”.  Base the master page on the “Site.Master” template that is in the root of the project. Add an <h2>Products</h2> heading the new Page, and add an <asp:gridview> control within it: Then click the “Design” tab to switch into design-view. Select the GridView control, and then click the top-right corner to display the GridView’s “Smart Tasks” UI: Choose the “New data source…” drop down option above.  This will bring up the below dialog which allows you to pick your Data Source type: Select the “Entity” data source option – which will allow us to easily connect our GridView to the EF model layer we created earlier.  This will bring up another dialog that allows us to pick our model layer: Select the “StoreEntities” option in the dropdown – which is the EF model layer we created earlier.  Then click next – which will allow us to pick which entity within it we want to bind to: Select the “Products” entity in the above dialog – which indicates that we want to bind against the “Product” entity class we defined earlier.  Then click the “Enable automatic updates” checkbox to ensure that we can both query and update Products.  When you click “Finish” VS will wire-up an <asp:EntityDataSource> to your <asp:GridView> control: The last two steps we’ll do will be to click the “Enable Editing” checkbox on the Grid (which will cause the Grid to display an “Edit” link on each row) and (optionally) use the Auto Format dialog to pick a UI template for the Grid. Step 8: Run the Application Let’s now run our application and browse to the /Products.aspx page that contains our GridView.  When we do so we’ll see a Grid UI of the Products within our SQL CE database. Clicking the “Edit” link for any of the rows will allow us to edit their values: When we click “Update” the GridView will post back the values, persist them through our EF Model Layer, and ultimately save them within our SQL CE database. Learn More about using EF with ASP.NET Web Forms Read this tutorial series on the http://asp.net site to learn more about how to use EF with ASP.NET Web Forms.  The tutorial series uses SQL Express as the database – but the nice thing is that all of the same steps/concepts can also now also be done with SQL CE.   Walkthrough 2: Using EF Code-First with SQL CE and ASP.NET MVC 3 We used a database-first approach with the sample above – where we first created the database, and then used the EF designer to create model classes from the database.  In addition to supporting a designer-based development workflow, EF also enables a more code-centric option which we call “code first development”.  Code-First Development enables a pretty sweet development workflow.  It enables you to: Define your model objects by simply writing “plain old classes” with no base classes or visual designer required Use a “convention over configuration” approach that enables database persistence without explicitly configuring anything Optionally override the convention-based persistence and use a fluent code API to fully customize the persistence mapping Optionally auto-create a database based on the model classes you define – allowing you to start from code first I’ve done several blog posts about EF Code First in the past – I really think it is great.  The good news is that it also works very well with SQL CE. The combination of SQL CE, EF Code First, and the new VS tooling support for SQL CE, enables a pretty nice workflow.  Below is a simple example of how you can use them to build a simple ASP.NET MVC 3 application. Step 1: Create a new ASP.NET MVC 3 Project We’ll begin by using the File->New Project menu command within Visual Studio to create a new ASP.NET MVC 3 project.  We’ll use the “Internet Project” template so that it has a default UI skin implemented: Step 2: Use NuGet to Install EFCodeFirst Next we’ll use the NuGet package manager (automatically installed by ASP.NET MVC 3) to add the EFCodeFirst library to our project.  We’ll use the Package Manager command shell to do this.  Bring up the package manager console within Visual Studio by selecting the View->Other Windows->Package Manager Console menu command.  Then type: install-package EFCodeFirst within the package manager console to download the EFCodeFirst library and have it be added to our project: When we enter the above command, the EFCodeFirst library will be downloaded and added to our application: Step 3: Build Some Model Classes Using a “code first” based development workflow, we will create our model classes first (even before we have a database).  We create these model classes by writing code. For this sample, we will right click on the “Models” folder of our project and add the below three classes to our project: The “Dinner” and “RSVP” model classes above are “plain old CLR objects” (aka POCO).  They do not need to derive from any base classes or implement any interfaces, and the properties they expose are standard .NET data-types.  No data persistence attributes or data code has been added to them.   The “NerdDinners” class derives from the DbContext class (which is supplied by EFCodeFirst) and handles the retrieval/persistence of our Dinner and RSVP instances from a database. Step 4: Listing Dinners We’ve written all of the code necessary to implement our model layer for this simple project.  Let’s now expose and implement the URL: /Dinners/Upcoming within our project.  We’ll use it to list upcoming dinners that happen in the future. We’ll do this by right-clicking on our “Controllers” folder and select the “Add->Controller” menu command.  We’ll name the Controller we want to create “DinnersController”.  We’ll then implement an “Upcoming” action method within it that lists upcoming dinners using our model layer above.  We will use a LINQ query to retrieve the data and pass it to a View to render with the code below: We’ll then right-click within our Upcoming method and choose the “Add-View” menu command to create an “Upcoming” view template that displays our dinners.  We’ll use the “empty” template option within the “Add View” dialog and write the below view template using Razor: Step 4: Configure our Project to use a SQL CE Database We have finished writing all of our code – our last step will be to configure a database connection-string to use. We will point our NerdDinners model class to a SQL CE database by adding the below <connectionString> to the web.config file at the top of our project: EF Code First uses a default convention where context classes will look for a connection-string that matches the DbContext class name.  Because we created a “NerdDinners” class earlier, we’ve also named our connectionstring “NerdDinners”.  Above we are configuring our connection-string to use SQL CE as the database, and telling it that our SQL CE database file will live within the \App_Data directory of our ASP.NET project. Step 5: Running our Application Now that we’ve built our application, let’s run it! We’ll browse to the /Dinners/Upcoming URL – doing so will display an empty list of upcoming dinners: You might ask – but where did it query to get the dinners from? We didn’t explicitly create a database?!? One of the cool features that EF Code-First supports is the ability to automatically create a database (based on the schema of our model classes) when the database we point it at doesn’t exist.  Above we configured  EF Code-First to point at a SQL CE database in the \App_Data\ directory of our project.  When we ran our application, EF Code-First saw that the SQL CE database didn’t exist and automatically created it for us. Step 6: Using VS 2010 SP1 to Explore our newly created SQL CE Database Click the “Show all Files” icon within the Solution Explorer and you’ll see the “NerdDinners.sdf” SQL CE database file that was automatically created for us by EF code-first within the \App_Data\ folder: We can optionally right-click on the file and “Include in Project" to add it to our solution: We can also double-click the file (regardless of whether it is added to the project) and VS 2010 SP1 will open it as a database we can edit within the “Server Explorer” tab of the IDE. Below is the view we get when we double-click our NerdDinners.sdf SQL CE file.  We can drill in to see the schema of the Dinners and RSVPs tables in the tree explorer.  Notice how two tables - Dinners and RSVPs – were automatically created for us within our SQL CE database.  This was done by EF Code First when we accessed the NerdDinners class by running our application above: We can right-click on a Table and use the “Show Table Data” command to enter some upcoming dinners in our database: We’ll use the built-in editor that VS 2010 SP1 supports to populate our table data below: And now when we hit “refresh” on the /Dinners/Upcoming URL within our browser we’ll see some upcoming dinners show up: Step 7: Changing our Model and Database Schema Let’s now modify the schema of our model layer and database, and walkthrough one way that the new VS 2010 SP1 Tooling support for SQL CE can make this easier.  With EF Code-First you typically start making database changes by modifying the model classes.  For example, let’s add an additional string property called “UrlLink” to our “Dinner” class.  We’ll use this to point to a link for more information about the event: Now when we re-run our project, and visit the /Dinners/Upcoming URL we’ll see an error thrown: We are seeing this error because EF Code-First automatically created our database, and by default when it does this it adds a table that helps tracks whether the schema of our database is in sync with our model classes.  EF Code-First helpfully throws an error when they become out of sync – making it easier to track down issues at development time that you might otherwise only find (via obscure errors) at runtime.  Note that if you do not want this feature you can turn it off by changing the default conventions of your DbContext class (in this case our NerdDinners class) to not track the schema version. Our model classes and database schema are out of sync in the above example – so how do we fix this?  There are two approaches you can use today: Delete the database and have EF Code First automatically re-create the database based on the new model class schema (losing the data within the existing DB) Modify the schema of the existing database to make it in sync with the model classes (keeping/migrating the data within the existing DB) There are a couple of ways you can do the second approach above.  Below I’m going to show how you can take advantage of the new VS 2010 SP1 Tooling support for SQL CE to use a database schema tool to modify our database structure.  We are also going to be supporting a “migrations” feature with EF in the future that will allow you to automate/script database schema migrations programmatically. Step 8: Modify our SQL CE Database Schema using VS 2010 SP1 The new SQL CE Tooling support within VS 2010 SP1 makes it easy to modify the schema of our existing SQL CE database.  To do this we’ll right-click on our “Dinners” table and choose the “Edit Table Schema” command: This will bring up the below “Edit Table” dialog.  We can rename, change or delete any of the existing columns in our table, or click at the bottom of the column listing and type to add a new column.  Below I’ve added a new “UrlLink” column of type “nvarchar” (since our property is a string): When we click ok our database will be updated to have the new column and our schema will now match our model classes. Because we are manually modifying our database schema, there is one additional step we need to take to let EF Code-First know that the database schema is in sync with our model classes.  As i mentioned earlier, when a database is automatically created by EF Code-First it adds a “EdmMetadata” table to the database to track schema versions (and hash our model classes against them to detect mismatches between our model classes and the database schema): Since we are manually updating and maintaining our database schema, we don’t need this table – and can just delete it: This will leave us with just the two tables that correspond to our model classes: And now when we re-run our /Dinners/Upcoming URL it will display the dinners correctly: One last touch we could do would be to update our view to check for the new UrlLink property and render a <a> link to it if an event has one: And now when we refresh our /Dinners/Upcoming we will see hyperlinks for the events that have a UrlLink stored in the database: Summary SQL CE provides a free, embedded, database engine that you can use to easily enable database storage.  With SQL CE 4 you can now take advantage of it within ASP.NET projects and applications (both Web Forms and MVC). VS 2010 SP1 provides tooling support that enables you to easily create, edit and modify SQL CE databases – as well as use the standard EF designer against them.  This allows you to re-use your existing skills and data knowledge while taking advantage of an embedded database option.  This is useful both for small applications (where you don’t need the scalability of a full SQL Server), as well as for development and testing scenarios – where you want to be able to rapidly develop/test your application without having a full database instance.  SQL CE makes it easy to later migrate your data to a full SQL Server or SQL Azure instance if you want to – without having to change any code in your application.  All we would need to change in the above two scenarios is the <connectionString> value within the web.config file in order to have our code run against a full SQL Server.  This provides the flexibility to scale up your application starting from a small embedded database solution as needed. Hope this helps, Scott P.S. In addition to blogging, I am also now using Twitter for quick updates and to share links. Follow me at: twitter.com/scottgu

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  • How to open .newb file (auto open)???

    - by u show me
    FIRSTLY apologies for english, embarased i am afghanistone i am team america no worrie u had large program that store not only config but a bunch other project relation settings in SQLite db. how can I save the db as project.newb file extension and thencan auto open in my porgram??? need INstaller setting?? How do i detect when this has happened, user open .newb file, happen in Qt, so i can load project? PLEASE HELP i fear family life if unable completed

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  • Decyphering Seagate drive model numbers?

    - by Stefan Lasiewski
    I'm comparing Seagate's Enterprise and Desktop drives for a variety of old and new servers. These servers come from different generations, so options like size (73GB, 2TB) and interface (SATA vs SAS 3.0Gbps vs SAS 6Gbps vs SCSI Ultra320) are widely variable. I'm trying to compare the sizes, speeds and interfaces, but I'm getting thrown off by different models. Also, their website is not the best. Does anyone know of a documented explanation of the Seagate model numbers? And is there a single spreadsheet which compares the features for all drives (or all 'Enterprise' drives?). Seagate drives have model numbers like this: Model ST3600057SS 6-Gb/s SAS 600 GB None at Cheetah® 15K Hard Drives Model ST373455LW Ultra320 SCSI 73.4 GB 68-Pin LW at Cheetah® 15K Hard Drives Model ST32000644NS SATA 3Gb/s 2 TB None at Constellation™ ES Hard Drives Model ST973452SS 6-Gb/s SAS 73 GB None Savvio® 15K Hard Drives Model ST9200011FS SATA 3Gb/s 200 GB Pulsar™ Solid State Drives I understand the model numbers read something like this: ST - SOMETHING1 - SIZE - SOMETHING2 - INTERFACE Where the fields mean something like this: ST : For 'Seagate'? 'Seagate Technoligies'? SOMETHING1 - This field has number, but I'm not sure what that represents. SIZE - Size in Gigabytes. This is a number like '73' or '300' or '2000' SOMETHING2 - This field also has a number, but I'm not sure what it means. INTERFACE - This field seems to indicate the Interface. 'SS' means SAS, 'FC' means Fibre Channel, but I don't see how to distinguish between 6Gbps SAS and 3Gbps SAS, or different SATA or FC speeds. I don't see a field which indicates the RPM (15K , 10K, 7.2K) etc. Is this part of the model number?

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  • In need of help with setting up the open source library JFreeChart

    - by ssbellows
    I am having trouble with setting up the open source library JFreeChart for creating charts using Java. This is the process I have followed so far in trying to set it up: I downloaded the latest version from their download page http://sourceforge.net/projects/jfreechart/files/. I then unpacked the jfreechart-1.0.13.zip in the directory C:\JFreeChart\jfreechart-1.0.13\ on my system drive. In the unpacked directory there is a folder entitled "lib" which contains the packaged .jar files specified as necessary to use JFreeChart. I added the following directory to my classpath: C:\JFreeChart\jfreechart-1.0.13\lib\ I then created a simple program and added the line "import org.jfree.chart.*;" to see if it would compile with a package imported from JFreeChart. I navigated to the folder in which my sample program was contained and compiled with the following command: "javac -classpath C:\ Program.java" I was given the following error: "package org.jfree.chart does not exist" Could someone please give me some input as to what I have done incorrectly in this setup process? This is the first time I've tried using an open source library, so I don't have any prior experience to go on myself. Thank you very much in advance.

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  • Where can I find free and open data?

    - by kitsune
    Sooner or later, coders will feel the need to have access to "open data" in one of their projects, from knowing a city's zip to a more obscure information such as the axial tilt of Pluto. I know data.un.org which offers access to the UN's extensive array of databases that deal with human development and other socio-economic issues. The other usual suspects are NASA and the USGS for planetary data. There's an article at readwriteweb with more links. infochimps.org seems to stand out. Personally, I need to find historic commodity prices, stock values and other financial data. All these data sets seem to cost money however. Clarification To clarify, I'm interested in all kinds of open data, because sooner or later, I know I will be in a situation where I could need it. I will try to edit this answer and include the suggestions in a structured manners. A link for financial data was hidden in that readwriteweb article, doh! It's called opentick.com. Looks good so far! Update I stumbled over semantic data in another question of mine on here. There is opencyc ('the world's largest and most complete general knowledge base and commonsense reasoning engine'). A project called UMBEL provides a light-weight, distilled version of opencyc. Umbel has semantic data in rdf/owl/skos n3 syntax. The Worldbank also released a very nice API. It offers data from the last 50 years for about 200 countries

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