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  • DB Schema for ACL involving 3 subdomains

    - by blacktie24
    Hi, I am trying to design a database schema for a web app which has 3 subdomains: a) internal employees b) clients c) contractors. The users will be able to communicate with each other to some degree, and there may be some resources that overlap between them. Any thoughts about this schema? Really appreciate your time and thoughts on this. Cheers! -- -- Table structure for table locations CREATE TABLE IF NOT EXISTS locations ( id bigint(20) NOT NULL, name varchar(250) NOT NULL ) ENGINE=InnoDB DEFAULT CHARSET=latin1; -- -- Table structure for table privileges CREATE TABLE IF NOT EXISTS privileges ( id int(11) NOT NULL AUTO_INCREMENT, name varchar(255) NOT NULL, resource_id int(11) NOT NULL, PRIMARY KEY (id) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=10 ; -- -- Table structure for table resources CREATE TABLE IF NOT EXISTS resources ( id int(11) NOT NULL AUTO_INCREMENT, name varchar(255) NOT NULL, user_type enum('internal','client','expert') NOT NULL, PRIMARY KEY (id) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=3 ; -- -- Table structure for table roles CREATE TABLE IF NOT EXISTS roles ( id int(11) NOT NULL AUTO_INCREMENT, name varchar(255) NOT NULL, type enum('position','department') NOT NULL, parent_id int(11) DEFAULT NULL, user_type enum('internal','client','expert') NOT NULL, PRIMARY KEY (id) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=3 ; -- -- Table structure for table role_perms CREATE TABLE IF NOT EXISTS role_perms ( id int(11) NOT NULL AUTO_INCREMENT, role_id int(11) NOT NULL, privilege_id int(11) NOT NULL, mode varchar(250) NOT NULL, PRIMARY KEY (id) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=2 ; -- -- Table structure for table users CREATE TABLE IF NOT EXISTS users ( id int(10) unsigned NOT NULL AUTO_INCREMENT, email varchar(255) NOT NULL, password varchar(255) NOT NULL, salt varchar(255) NOT NULL, type enum('internal','client','expert') NOT NULL, first_name varchar(255) NOT NULL, last_name varchar(255) NOT NULL, location_id int(11) NOT NULL, phone varchar(255) NOT NULL, status enum('active','inactive') NOT NULL DEFAULT 'active', PRIMARY KEY (id) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=4 ; -- -- Table structure for table user_perms CREATE TABLE IF NOT EXISTS user_perms ( id int(11) NOT NULL AUTO_INCREMENT, user_id int(11) NOT NULL, privilege_id int(11) NOT NULL, mode varchar(250) NOT NULL, PRIMARY KEY (id) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=2 ; -- -- Table structure for table user_roles CREATE TABLE IF NOT EXISTS user_roles ( id int(11) NOT NULL, user_id int(11) NOT NULL, role_id int(11) NOT NULL ) ENGINE=InnoDB DEFAULT CHARSET=latin1;

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  • Android Form Design Overlaping

    - by Mashfuk
    In My Project I have to built a registration form like the following. But when I design the form it overlays some item. How can I easily design registration form in android. How can I solve this? Thanks in advanced. <?xml version="1.0" encoding="utf-8"?> <ScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/ScrollView1" android:layout_width="fill_parent" android:layout_height="fill_parent" > <RelativeLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#FFFFFF" > <TextView android:text="Registration Form" android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content"> </TextView> <View android:layout_below="@id/textView1" android:background="#000000" android:layout_height="1dp" android:id="@+id/view1" android:layout_width="fill_parent" > </View> <!-- Child Menu Section of Registration Form --> <RelativeLayout android:layout_below="@id/textView1" android:id="@+id/rlKidsMenuRegForm" android:layout_height="wrap_content" android:layout_width="fill_parent" > <TextView android:layout_alignParentLeft="true" android:text="Do you use the kids MENU?" android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="@+id/textView2"> </TextView> <EditText android:layout_toRightOf="@id/textView2" android:textSize="10sp" android:layout_height="15dp" android:text="EditText" android:id="@+id/editText1" android:layout_width="wrap_content"> </EditText> <EditText android:layout_height="wrap_content" android:text="EditText" android:textSize="10sp" android:id="@+id/editText2" android:layout_width="wrap_content" android:layout_below="@id/editText1"> </EditText> <EditText android:layout_toRightOf="@id/editText2" android:layout_below="@id/editText1" android:layout_height="wrap_content" android:textSize="10sp" android:text="EditText" android:id="@+id/editText3" android:layout_width="wrap_content"> </EditText> <View android:layout_below="@id/editText3" android:background="#000000" android:layout_height="1dp" android:id="@+id/view1" android:layout_width="fill_parent" > </View> </RelativeLayout> <!-- Mid Section of Registration Form --> <RelativeLayout android:layout_below="@id/rlKidsMenuRegForm" android:id="@+id/rlMidRegForm" android:layout_height="wrap_content" android:layout_width="fill_parent" android:background="#FFFFFF" > <EditText android:layout_alignParentLeft="true" android:layout_height="wrap_content" android:text="EditText" android:id="@+id/editText4" android:layout_width="wrap_content"> </EditText> <EditText android:layout_height="wrap_content" android:text="EditText" android:id="@+id/editText5" android:layout_width="wrap_content" android:layout_toRightOf="@id/editText4"> </EditText> <TextView android:text="TextView" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_width="fill_parent" android:id="@+id/textView3" android:layout_below="@id/editText5" > </TextView> <EditText android:layout_height="wrap_content" android:text="EditText" android:id="@+id/editText5" android:layout_width="fill_parent" android:layout_below="@id/textView3"> </EditText> <TextView android:text="TextView" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_width="fill_parent" android:layout_below="@id/editText5" android:id="@+id/textView3" > </TextView> <TextView android:text="TextView" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_width="wrap_content" android:id="@+id/textView3" android:layout_below="@id/textView3" > </TextView> </RelativeLayout> </RelativeLayout> </ScrollView>

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  • Appropriate programming design questions.

    - by Edward
    I have a few questions on good programming design. I'm going to first describe the project I'm building so you are better equipped to help me out. I am coding a Remote Assistance Tool similar to TeamViewer, Microsoft Remote Desktop, CrossLoop. It will incorporate concepts like UDP networking (using Lidgren networking library), NAT traversal (since many computers are invisible behind routers nowadays), Mirror Drivers (using DFMirage's Mirror Driver (http://www.demoforge.com/dfmirage.htm) for realtime screen grabbing on the remote computer). That being said, this program has a concept of being a client-server architecture, but I made only one program with both the functionality of client and server. That way, when the user runs my program, they can switch between giving assistance and receiving assistance without having to download a separate client or server module. I have a Windows Form that allows the user to choose between giving assistance and receiving assistance. I have another Windows Form for a file explorer module. I have another Windows Form for a chat module. I have another Windows Form form for a registry editor module. I have another Windows Form for the live control module. So I've got a Form for each module, which raises the first question: 1. Should I process module-specific commands inside the code of the respective Windows Form? Meaning, let's say I get a command with some data that enumerates the remote user's files for a specific directory. Obviously, I would have to update this on the File Explorer Windows Form and add the entries to the ListView. Should I be processing this code inside the Windows Form though? Or should I be handling this in another class (although I have to eventually pass the data to the Form to draw, of course). Or is it like a hybrid in which I process most of the data in another class and pass the final result to the Form to draw? So I've got like 5-6 forms, one for each module. The user starts up my program, enters the remote machine's ID (not IP, ID, because we are registering with an intermediary server to enable NAT traversal), their password, and connects. Now let's suppose the connection is successful. Then the user is presented with a form with all the different modules. So he can open up a File Explorer, or he can mess with the Registry Editor, or he can choose to Chat with his buddy. So now the program is sort of idle, just waiting for the user to do something. If the user opens up Live Control, then the program will be spending most of it's time receiving packets from the remote machine and drawing them to the form to provide a 'live' view. 2. Second design question. A spin off question #1. How would I pass module-specific commands to their respective Windows Forms? What I mean is, I have a class like "NetworkHandler.cs" that checks for messages from the remote machine. NetworkHandler.cs is a static class globally accessible. So let's say I get a command that enumerates the remote user's files for a specific directory. How would I "give" that command to the File Explorer Form. I was thinking of making an OnCommandReceivedEvent inside NetworkHandler, and having each form register to that event. When the NetworkHandler received a command, it would raise the event, all forms would check it to see if it was relevant, and the appropriate form would take action. Is this an appropriate/the best solution available? 3. The networking library I'm using, Lidgren, provides two options for checking networking messages. One can either poll ReadMessage() to return null or a message, or one can use an AutoResetEvent OnMessageReceived (I'm guessing this is like an event). Which one is more appropriate?

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  • Magento Onepage Success Conversion Tracking Design Pattern

    - by user1734954
    My intent is to track conversions through multiple channels by inserting third party javascript (for example google analytics, optimizely, pricegrabber etc.) into the footer of onepage success . I've accomplished this by adding a block to the footer reference inside of the checkout success node within local.xml and everything works appropriately. My questions are more about efficiency and extensibility. It occurred to me that it would be better to combine all of the blocks into a single block reference and then use a various methods acting on a single call to the various related models to provide the data needed for insertion into the javascript for each of the conversion tracking scripts. Some examples of the common data that conversion tracking may rely on(pseudo): Order ID , Order Total, Order.LineItem.Name(foreach) and so on Currently for each of the scripts I've made a call to the appropriate model passing the customers last order id as the load value and the calling a get() assigning the return value to a variable and then iterating through the data to match the values with the expectations of the given third party service. All of the data should be pulled once when checkout is complete each third party services may expect different data in different formats Here is an example of one of the conversion tracking template files which loads at the footer of checkout success. $order = Mage::getModel('sales/order')->loadByIncrementId(Mage::getSingleton('checkout/session')->getLastRealOrderId()); $amount = number_format($order->getGrandTotal(),2); $customer = Mage::helper('customer')->getCustomer()->getData(); ?> <script type="text/javascript"> popup_email = '<?php echo($customer['email']);?>'; popup_order_number = '<?php echo $this->getOrderId() ?>'; </script> <!-- PriceGrabber Merchant Evaluation Code --> <script type="text/javascript" charset="UTF-8" src="https://www.pricegrabber.com/rating_merchrevpopjs.php?retid=<something>"></script> <noscript><a href="http://www.pricegrabber.com/rating_merchrev.php?retid=<something>" target=_blank> <img src="https://images.pricegrabber.com/images/mr_noprize.jpg" border="0" width="272" height="238" alt="Merchant Evaluation"></a></noscript> <!-- End PriceGrabber Code --> Having just a single piece of code like this is not that big of a deal, but we are doing similar things with a number of different third party services. Pricegrabber is one of the simpler examples. A more sophisticated tracking service expects a comma separated list of all of the product names, ids, prices, categories , order id etc. I would like to make it all more manageable so my idea to do the following: combine all of the template files into a single file Develop a helper class or library to deliver the data to the conversion template Goals Include Extensibility Minimal Model Calls Minimal Method Calls The Questions 1. Is a Mage helper the best route to take? 2. Is there any design pattern you may recommend for the "helper" class? 3. Why would this the design pattern you've chosen be best for this instance?

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  • Poll Results: Foreign Key Constraints

    - by Darren Gosbell
    A few weeks ago I did the following post asking people – if they used foreign key constraints in their star schemas. The poll is still open if you are interested in adding to it, but here is what the chart looks like as of today. (at the bottom of the poll itself there is a link to the live results, unfortunately I cannot link the live results in here as the blogging platform blocks the required javascript)   Interestingly the results are fairly even. Of the 78 respondents, fractionally over half at least aim to start with referential integrity in their star schemas. I did not want to influence the results by sharing my opinion, but my personal preference is to always aim to have foreign key constraints. But at the same time, I am pragmatic about it, I do have projects where for various reasons some constraints are not defined. And I also have other designs that I have inherited, where it would just be too much work to go back and add foreign key constraints. If you are going to implement foreign keys in your star schema, they really need to be there at the start. In fact this poll was was the result of a feature request for BIDSHelper asking for a feature to check for null/missing foreign keys and I am entirely convinced that BIDS is the wrong place for this sort of functionality. BIDS is a design tool, your data needs to be constantly checked for consistency. It's not that I think that it's impossible to get a design working without foreign key constraints, but I like the idea of failing as soon as possible if there is an error and enforcing foreign key constraints lets me "fail early" if there are constancy issues with my data. By far the biggest concern with foreign keys is performance and I suppose I'm curious as to how often people actually measure and quantify this. I worked on a project a number of years ago that had very large data volumes and we did find that foreign key constraints did have a measurable impact, but what we did was to disable the constraints before loading the data, then enabled and checked them afterwards. This saved as time (although not as much as not having constraints at all), but still let us know early in the process if there were any consistency issues. For the people that do not have consistent data, if you have ETL processes that you control that are building your star schema which you also control, then to be blunt you only have yourself to blame. It is the job of the ETL process to make the data consistent. There are techniques for handling situations like missing data as well as  early and late arriving data. Ralph Kimball's book – The Data Warehouse Toolkit goes through some design patterns for handling data consistency. Having foreign key relationships can also help the relational engine to optimize queries as noted in this recent blog post by Boyan Penev

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  • Filezilla/Puttygen doesn't recognize private key file

    - by devzoner
    I have generated a key for an Ubuntu Virtual Machine running on Azure Cloud Services http://www.windowsazure.com/en-us/manage/linux/how-to-guides/ssh-into-linux/ openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout myPrivateKey.key -out myCert.pem When loading the private key into Filezilla, it asks me to convert the format, however, when converting the key it fails, the same happens with puttygen from linux console, using this: puttygen myPrivateKey.key -o myKey.ppk In both cases I have the following error: puttygen: error loading `myPrivateKey.key': unrecognised key type By the way, this key doesn't have a passphrase. I found an old thread about it, but I'm using 0.6.3 version which is newer than what this thread recommends: http://fixunix.com/ssh/541874-puttygen-unable-import-openssh-key.html I've managed to solve this issue by using another gui client Fugu for Mac, but one of my co-worker uses windows and I still have to figure this out. Since Filezilla is the de-facto ftp client, I thought it would be easier to solve it there. Thanks

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  • Fingerprint of PEM ssh key

    - by Unknown
    I have a PEM file which I add to a running ssh-agent: $ file query.pem query.pem: PEM RSA private key $ ssh-add ./query.pem Identity added: ./query.pem (./query.pem) $ ssh-add -l | grep query 2048 ef:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX ./query.pem (RSA) My question is how I can get the key fingerprint I see in ssh-agent directly from the file. I know ssh-keygen -l -f some_key works for "normal" ssh keys, but not for PEM files. If I try ssh-keygen on the .pem file, I get: $ ssh-keygen -l -f ./query.pem key_read: uudecode PRIVATE KEY----- failed key_read: uudecode PRIVATE KEY----- failed ./query.pem is not a public key file. This key starts with: -----BEGIN RSA PRIVATE KEY----- MIIEp.... etc. as opposed to a "regular" private key, which looks like: -----BEGIN RSA PRIVATE KEY----- Proc-Type: 4,ENCRYPTED DEK-Info: AES-128-CBC,E15F2.... etc.

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  • SQLAlchemy unsupported type error - and table design issues?

    - by Az
    Hi there, back again with some more SQLAlchemy shenanigans. Let me step through this. My table is now set up as so: engine = create_engine('sqlite:///:memory:', echo=False) metadata = MetaData() students_table = Table('studs', metadata, Column('sid', Integer, primary_key=True), Column('name', String), Column('preferences', Integer), Column('allocated_rank', Integer), Column('allocated_project', Integer) ) metadata.create_all(engine) mapper(Student, students_table) Fairly simple, and for the most part I've been enjoying the ability to query almost any bit of information I want provided I avoid the error cases below. The class it is mapped from is: class Student(object): def __init__(self, sid, name): self.sid = sid self.name = name self.preferences = collections.defaultdict(set) self.allocated_project = None self.allocated_rank = 0 def __repr__(self): return str(self) def __str__(self): return "%s %s" %(self.sid, self.name) Explanation: preferences is basically a set of all the projects the student would prefer to be assigned. When the allocation algorithm kicks in, a student's allocated_project emerges from this preference set. Now if I try to do this: for student in students.itervalues(): session.add(student) session.commit() It throws two errors, one for the allocated_project column (seen below) and a similar error for the preferences column: sqlalchemy.exc.InterfaceError: (InterfaceError) Error binding parameter 4 - probably unsupported type. u'INSERT INTO studs (sid, name, allocated_rank, allocated_project) VALUES (?, ?, ?, ?, ?, ?, ?)' [1101, 'Muffett,M.', 1, 888 Human-spider relationships (Supervisor id: 123)] If I go back into my code I find that, when I'm copying the preferences from the given text files, it actually refers to the Project class which is mapped to a dictionary, using the unique project id's (pid) as keys. Thus, as I iterate through each student via their rank and to the preferences set, it adds not a project id, but the reference to the project id from the projects dictionary. students[sid].preferences[int(rank)].add(projects[int(pid)]) Now this is very useful to me since I can find out all I want to about a student's preferred projects without having to run another check to pull up information about the project id. The form you see in the error has the object print information passed as: return "%s %s (Supervisor id: %s)" %(self.proj_id, self.proj_name, self.proj_sup) My questions are: I'm trying to store an object in a database field aren't I? Would the correct way then, be copying the project information (project id, name, etc) into its own table, referenced by the unique project id? That way I can just have the project id field for one of the student tables just be an integer id and when I need more information, just join the tables? So and so forth for other tables? If the above makes sense, then how does one maintain the relationship with a column of information in one table which is a key index on another table? Does this boil down into a database design problem? Are there any other elegant ways of accomplishing this? Apologies if this is a very long-winded question. It's rather crucial for me to solve this, so I've tried to explain as much as I can, whilst attempting to show that I'm trying (key word here sadly) to understand what could be going wrong.

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  • How to use Unique Composite Key

    - by LifeH2O
    I have a table Item(ItemName*, ItemSize*, Price, Notes) I was making composite key of (ItemName,ItemSize) to uniquely identify item. And now after reading some answers on stackoverflow suggesting the use of UNIQUE i revised it as Item(ItemID*, ItemName, ItemSize, Price, Notes) But How to apply UNIQUE constraint on ItemName and ItemSize please correct if there is something wrong in question

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  • Google Apps Email for new Primary Youtube Email

    - by MLM
    I have a YouTube account that I want to change the primary email for but every time I try to add a alternate address it says it is already associated with another google account. The email is a google apps user because I want to manage my domains email through gmail. I have already tried deleting the account and re-creating it to make sure it is not associated with anything. The only way I can add it is if I delete the google apps account but then I can not verify since I need to access the verification email.

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  • Rejuvenated: Script Creates and Drops for Candidate Keys and Referencing Foreign Keys

    - by Adam Machanic
    Once upon a time it was 2004, and I wrote what I have to say was a pretty cool little script . (Yes, I know the post is dated 2006, but that's because I dropped the ball and failed to back-date the posts when I moved them over here from my prior blog space.) The impetus for creating this script was (and is) simple: Changing keys can be a painful experience. Sometimes you want to make a clustered key nonclustered, or a nonclustered key clustered. Or maybe you want to add a column to the key. Or remove...(read more)

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  • Primary domain in vps in vps has been deactivated

    - by manix
    This is my scenario: I have a vps with two domains (example1.com, example2.com). When I started with this vps I set example1.com as primary domain and the nameserver were configured with the pattern ns1.example.com, ns2.example1.com. The domains were brought in name.com. Across the time, I usually only work whit the domain example2.com, for that reason I stopped to pay example1.com anual registration and just keep the example2.com. But, today my vps is unreacheable because the main domain was deactivated last ago 23th. I never imagined that it could affect my server. So, I am so worried because I don't know if rebuild the vps is the solution here because I could lost my data. Can you take me to the right direction in order to recover my vps?

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  • Why is Ubuntu unmounting my primary hard drive?

    - by Twisol
    I'm running Ubuntu 10.10 on my laptop (an Asus G73j), dual-booting Windows 7 if that matters. After using the computer for couple of hours or so, I get a popup complaining that a file was unmounted, then my GNOME desktop panels disappear. I can't save any unsaved work (the file browser shows "Filesystem" as totally empty), and other programs break in odd ways (like Chrome can't browse to any new pages, but keeps current ones going... at least I still have Pandora to listen to when this happens!). I've tried looking in the system logs to no avail; I'm assuming that it can't write any errors to the logs because, of course, the logs are on the primary hard drives. This started happening maybe a few days ago. Yesterday I upgraded from 10.4, but I believe it was happening before then. Any advice for figuring this out?

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  • Primary domain in vps has been deactivated

    - by manix
    This is my scenario: I have a vps with two domains (example1.com, example2.com). When I started with this vps I set example1.com as primary domain and the nameserver were configured with the pattern ns1.example.com, ns2.example1.com. The domains were brought in name.com. Across the time, I usually only work whit the domain example2.com, for that reason I stopped to pay example1.com anual registration and just keep the example2.com. But, today my vps is unreacheable because the main domain was deactivated last ago 23th. I never imagined that it could affect my server. So, I am so worried because I don't know if rebuild the vps is the solution here because I could lost my data. Can you take me to the right direction in order to recover my vps?

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  • Using IE 9 as my primary browser

    - by Robert May
    With the release of Internet Explorer 9 RC the browser looks to be in a usable state.  So far, my experience has been positive. However, one area where I am having problems is when people are using the jQueryUI library.  Versions older than 1.8 cause IE 9.0 to be unable to drag and drop.  This is a real pain, especially at sites like Agile Zen, where dragging and dropping is a primary bit of functionality. Now that IE 9 is a release candidate, we’ll see how quickly these things improve.  I expect things to be rough, but so far, I’m really liking IE 9.  There’s more real estate than Chrome (it’s the tabs inline with the address bar) and its faster than Chrome 9.0 and FF 3.6.8 (as tested on my own machine). The biggest drawback so far is that because IE has been so badly behaved in the past, sites expect it to be badly behaved now, which is breaking things now. Technorati Tags: Internet Explorer

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  • Database Design for a double entry accounting system

    - by Khou
    Should journal entries be recorded in a database design? In the real world it makes sense to keep a daily entry book, then later transfer the daily entry book into double entry accounts. but in the computerized version, doing this produces duplicate records and that doesn't quite make sense? ???? What i mean is 1) user enter details , it gets recorded (this would be called the journalbook in real life) 2) the software does all the double entry accounting then references the journalbook and splits up the transaction into the double entry accounting system.

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  • php html flash website design tools for beginner

    - by LikeToCode
    I have 5 years of C#, Perl and SQL programming experience but I've just found a web designer and developer job. I dont know anything about it but need to design a website using PHP, flash and HTML, whatever it is. Can you give me pointers on where to start to learn it all ASAP and start designing the website? I downloaded WAMP and learned to configure it. Other then that I dont know what to do next. They gave me a few pictures to incorporate, but I dont know how :)

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  • REST api design to retrieve summary information

    - by Jacques René Mesrine
    I have a scenario in which I have REST API which manages a Resource which we will call Group. A Group is similar in concept to a discussion forum in Google Groups. Now I have two GET access method which I believe needs separate representations. The 1st GET access method retrieves the minimal amount of information about a Group. Given a *group_id* it should return a minimal amount of information like { group_id: "5t7yu8i9io0op", group_name: "Android Developers", is_moderated: true, number_of_users: 34, new_messages: 5, icon: "http://boo.com/pic.png" } The 2nd GET access method retrives summary information which are more statistical in nature like: { group_id: "5t7yu8i9io0op", top_ranking_users: { [ { user: "george", posts: 789, rank: 1 }, { user: "joel", posts: 560, rank: 2 } ...] }, popular_topics: { [ ... ] } } I want to separate these data access methods and I'm currently planning on this design: GET /group/:group_id/ GET /group/:group_id/stat Only the latter will return the statistical information about the group. What do you think about this ?

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  • From a language design perspective, if Javascript objects are simply associative arrays, then why ha

    - by Christopher Altman
    I was reading about objects in O'Reilly Javascript Pocket Reference and the book made the following statement. An object is a compound data type that contains any number of properties. Javascript objects are associative arrays: they associate arbitrary data values with arbitrary names. From a language design perspective, if objects are simply associative arrays, then why have objects? I appreciate the convenience of having objects in the language, but if convenience is the main purpose for adding a data type, then how do you decide what to add and what to not add in a language? A language can quickly become bloated and less valuable if it is weighed down by several overlapping methods and data types (Is this a true statement or am I missing something).

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  • robocode engine: how to design (write) the runtime engine -- the robot world

    - by Bob
    IBM has (had) a free learn-Java program called RoboCode, in which custom robots could be written that would then do battle in a 2D space. I would like to write the environment that supports such robots, but don't know what pattern or design to use. Each robot is a thread. Each thread is given a certain (indeterminate) amount of run-time by the JRE. A robot world engine would start by building a list of the players/robots, then enter a loop that allows each player in turn to do whatever it likes: move forward, turn left, fire toward the northwest corner, whatever. Each robot is also informed of events of interest: an enemy or several enemies are within range, it has been hit by a bullet, etc. The combination of handling threads that are also event listeners (are they also producers?) confuses me; it seems that there's more to the game engine. Even some general ideas would help. TIA.

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  • Database design for very large amount of data

    - by Hossein
    Hi, I am working on a project, involving large amount of data from the delicious website.The data available is at files are "Date,UserId,Url,Tags" (for each bookmark). I normalized my database to a 3NF, and because of the nature of the queries that we wanted to use In combination I came down to 6 tables....The design looks fine, however, now a large amount of data is in the database, most of the queries needs to "join" at least 2 tables together to get the answer, sometimes 3 or 4. At first, we didn't have any performance issues, because for testing matters we haven't had added too much data in the database. No that we have a lot of data, simply joining extremely large tables does take a lot of time and for our project which has to be real-time is a disaster.I was wondering how big companies solve these issues.Looks like normalizing tables just adds complexity, but how does the big company handle large amounts of data in their databases, don't they do the normalization? thanks

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  • Database design in blogging systems

    - by Peter
    As a learning exercise I'm trying to put myself a blogging system. The goal is to code something that will let me create multiple blogs, like blogger.com or wordpress.com, but much simplified. I would like to ask you, what do you think is best database design for this type of script. Is it better to have one big table, containing posts from all blogs of all users (like friendfeed) or would it be better to create separate table for each blog's posts? Big thanks in advance for your help, Peter.

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  • OOP Design of items in a Point-of-Sale system

    - by Jonas
    I am implementing a Point-of-Sale system. In the system I represent an Item in three places, and I wounder how I should represent them in OOP. First I have the WarehouseItem, that contains price, purchase price, info about the supplier, suppliers price, info about the product and quantity in warehouse. Then I have CartItem, which contains the same fields as WarehouseItem, but adds NrOfItems and Discount. And finally I have ReceiptItem, thats contains an item where I have stripped of info about the supplier, and only contains the price that was payed. Are there any OOP-recommendations, best-practices or design patterns that I could apply for this? I don't really know if CartItem should contain (wrap) an WarehouseItem, or extend it, or if I just should copy the fields that I need. Maybe I should create an Item-class where I keep all common fields, and then extend it to WarehouseItem, CartItem and ReceiptItem. Sometimes I think that it is good to keep the field of the item and just display the information that is needed.

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  • Cost of Design vs Development

    - by Marco
    I usually develop content management solutions in php, I work with designers that create the front end (html & css) and I usually develop the backend (php & mysql) of said cms. I know that the cost of the website may vary depending of the complexity of the html or the backend, but taking as reference a very basic website, what percentage of the cost should go to design and what percentage should go to development. I want to make clear that I as the developer i'm in charge of all the effects and animations of the websites using some of the javascript frameworks, not the designer. I just want to know what´s the fair share for me and for the designer.

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  • Database Design for multiple users site

    - by jl
    Hi, I am required to work on a php project that requires the database to cater to multiple users. Generally, the idea is similar to what they have for carbonmade or basecamp, or even wordpress mu. They cater to multiple users, whom are also owners of their accounts. And if they were to cancel/terminate their account, anything on the pages/database would be removed. I am not quite sure how should I design the database? Should it be: separate tables for individual user account separate databases for individual user account or otherwise? Kindly advise me for the best approach to this issue. Thank you very much.

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