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• Database design - table relationship question

  - by iama

  I am designing schema for a simple quiz application. It has 2 tables - "Question" and "Answer Choices". Question table has 'question ID', 'question text' and 'answer id' columns. "Answer Choices" table has 'question ID', 'answer ID' and 'answer text' columns. With this simple schema it is obvious that a question can have multiple answer choices & hence the need for the answer choices table. However, a question can have only one correct answer and hence the need for the 'answer ID' in the question table. However, this 'answer ID' column in the question table provides a illusion as though there can be multiple questions for a single answer which is not correct. The other alternative to eliminate this illusion is to have another table just for correct answer that will have just 2 columns namely the question ID and the answer ID with a 1-1 relationship between the two tables. However, I think this is redundant. Any recommendation on how best to design this thereby enforcing the rules that a question can have multiple answer choices but only one correct answer? Many Thanks.

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• NHibernate many-to-many relationship does not update join-table

  - by Davide Vosti

  I'm having trouble saving a many-to-many relationship with nhibernate. I searched and looked at almost every same question in SO and google but nothing works. The single classes are update correctly but nothing is inserted in the join-table. I have 2 classes: Event and Category. The mapping is this: Event: <bag name="Categories" access="field.camelcase-underscore" table="EventCategories" inverse="true" cascade="all-delete-orphan" lazy="true"> <key column="Event"/> <many-to-many class="Category" column="Category"/> </bag> Category: <bag name="Events" table="EventCategories" access="field.camelcase-underscore" cascade="all-delete-orphan" lazy="true" > <key column="Category"/> <many-to-many class="Event" column="Event"/> </bag> I tried to swap every parameter in both mappings but nothing works... Do you know what I'm doing wrong or have a right mapping for this case? Thank you very much!

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• Entity Framework 1:1 Relationship Identity Colums

  - by Hupperware

  I cannot for the life of me get two separate tables to save with a relationship and two identity columns. I keep getting errors like A dependent property in a ReferentialConstraint is mapped to a store-generated column. Column: 'OlsTerminalId'. I can't imagine that this setup is abnormal. [DataContract] public class OlsData { private static readonly DateTime theUnixEpoch = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc); [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public int OlsDataId { get; set; } [DataMember(Name = "id")] public int Id { get; set; } public DateTime Timestamp { get; set; } [DataMember(Name = "created")] [NotMapped] public double Created { get { return (Timestamp - theUnixEpoch).TotalMilliseconds; } set { Timestamp = theUnixEpoch.AddMilliseconds(value); } } [InverseProperty("OlsData")] [DataMember(Name = "terminal")] public virtual OlsTerminal OlsTerminal { get; set; } } [DataContract] public class OlsTerminal { [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public int OlsTerminalId { get; set; } public int OlsDataId { get; set; } [DataMember(Name = "account")] [NotMapped] public virtual OlsAccount OlsAccount { get; set; } [DataMember(Name = "terminalId")] public string TerminalId { get; set; } [DataMember(Name = "merchantId")] public string MerchantId { get; set; } public virtual OlsData OlsData { get; set; } } public class OlsDataContext : DbContext { protected override void OnModelCreating(DbModelBuilder aModelBuilder) { aModelBuilder.Conventions.Remove<PluralizingTableNameConvention>(); } public OlsDataContext(string aConnectionString) : base(aConnectionString) {} public DbSet<OlsData> OlsData { get; set; } public DbSet<OlsTerminal> OlsTerminal { get; set; } public DbSet<OlsAccount> OlsAccount { get; set; } }

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• Laravel4: Checking many-to-many relationship attribute even when it does not exist

  - by Simo A.

  This is my first time with Laravel and also Stackoverflow... I am developing a simple course management system. The main objects are User and Course, with a many-to-many relationship between them. The pivot table has an additional attribute, participant_role, which defines whether the user is a student or an instructor within that particular course. class Course extends Eloquent { public function users() { return $this->belongsToMany('User')->withPivot('participant_role')->withTimestamps(); } } However, there is an additional role, system admin, which can be defined on the User object. And this brings me mucho headache. In my blade view I have the following: @if ($course->pivot->participant_role == 'instructor') { // do something here... } This works fine when the user has been assigned to that particular $course and there is an entry for this user-course combination in the pivot table. However, the problem is the system administrator, who also should be able to access course details. The if-clause above gives Trying to get property of non-object error, apparently because there is no entry in the pivot table for system administrator (as the role is defined within the User object). I could probably solve the problem by using some off-the-shelf bundle for handling role-based permissions. Or I could (but don't want to) do something like this with two internal if-clauses: if (!empty($course->pivot)) { if ($course->pivot->participant_role == 'instructor') { // do something... } } Other options (suggested in partially similar entries in Stackoverflow) would include 1) reading all the pivot table entries to an array, and use in_array to check if a role exists, or even 2) SQL left join to do this on database level. However, ultimately I am looking for a compact one-line solution? Can I do anything similar to this, which unfortunately does not seem to work? if (! empty ($course->pivot->participant_role == 'instructor') ) { // do something... } The shorter the answer, the better :-). Thanks a lot!

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• Hibernate 1:M relationship ,row order, constant values table and concurrency

  - by EugeneP

  table A and B need to have 1:M relationship a and b are added during application runtime, so A created, then say 4 B's created. Each B instance has to come in order, so that I could later extract them in the same order as I added them. The app will be a web-app running on Tomcat, so 10 instances may work simultaneously. So my question are: 1) How to preserve inserting order, so that I could extract B instances that A references in the same order as I persisted them. That's tricky, because we add to a Collection and then it gets saved (am I right?). So, it depends on how Hibernate saves it, what if it changes the order in what we added instances? I've seen something like LIST instead of SET when describing relationships, is that what I need? 2) How to add a 3-rd column to B so that I could differentiate the instances, something like SEX(M,F,U) in B table. Do I need a special table, or there's and easy way to describe constants in Hibernate. What do you recommend? 3) Talking about concurrency, what methods do you recommend to use? There should be no collisions in the db and as you see, there might easily be some if rows are not inserted (PK added) right where it is invoked without delays ?

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• What are the CS fundamentals behind package/dependency management?

  - by Frep D-Oronge

  Often I hear about situations where companies are developing extensable in house software (the dreaded enterprise 'framework') which is supposed to support multiple 'plugins' from diffirent teams. Usually this ends up being a half baked solution that does not really work due to compatibility prolems between addins, or between addins and the framework itself. Usually this means QA have to 'rubber stamp' a global set of versions accross all plugins, or more usually plugins are released and stuff breaks in nasty ways. This problem has been solved before however, for example the package management systems like apt for debian linux. I suspect that the reason it works is that it is built from the start on a known 'Computer Science-y' concept. My question is what is it?

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• When is it good to start using project management applications?

  - by Mr.Gando

  Hello, I was wondering, when is the right time or the correct project size to start using project management applications ( like Redmine or Trac ). I have a serious project, for now it's only me developing, but I use redmine to set my project versions, issues, and estimations. I think it's a good idea, because you never know when somebody else is going to join the team, and also allows me to organize myself effectively. I ask this question because I was Teaching Assistant at my university for one year in a row for a course, and I got questions about this very very often. While I'm a believer of the KISS principle, I think that learning to use this tools early is a win-win most of the time. I really believe that we can avoid this question to become argumentative, and that there's somewhat of a consensus about this issue, which I consider quite important in todays software development world. So, when is the right time ? what is the correct project/team size ?

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• how to handle it if the management just keep on giving me spec after spec non-stop?

  - by Jian Lin

  As a programmer, I feel burnt out if the management give me spec after spec, day after day. I think I can code 6 hours a day very focused, but non-stop coding does burn me out a little, especially it is 1 year or 18 months non-stop. A mere 1 week or 2 week vacation per year isn't going to help much. Sometimes I want to take some time to learn new things, or just to take a break for a month so as to re-charge, like back in college when we have holidays for 1 month during winter or 2.5 months during summer. What do you think?

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• What combination of project-management software will meet my just-started project's needs?

  - by taz

  Hello all, I have a got couple of software projects that I want to run with my friends(max 10 persons) privately(at least for now). But I'm kind of lost between software management systems. I am not even sure about the definitions of my needs. Dear all, what is the definition/name of the system/software that meets my needs listed below? Continuous Integration? And please suggest me a good ALL-IN-ONE instance of it: project roadmap/planning project resource(people) allocation project issue&bug tracking project mailing list project forum project wiki source control server source control client repository change notifier client build system(like scons) nightly build automation IDE integration(VS) Note: I tried Redmine and liked it, but found it kind of slow. All-in-one kind ones will be the most appreciated but if your suggestion includes more than 3 softwares, please suggest me the ones that work together painlessly. thanks in advance..

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• What's the best way to capture output from SQL Management Studio and paste it into an Outlook email?

  - by Decker

  I'm constantly executing ad-hoc queries in SQL Management Studio and need to send the results to people via email. This happens several times a day so I'm looking for the best way to copy the results of the query from the results window into an Outlook email body so that it can be formatted in a reader friendly manner. I haven't come up with anything that works well for me. When it really matters, I end up going into Excel, executing the query from within there and then attaching the resulting spreadsheet. I'm looking for something that I can do without involving Excel if possible. Any ideas?

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• How to modify the Title Bar text for SQL Server Management Studio?

  - by DaveDev

  Sometimes I keep multiple instances of SQL Server Management Studio 2005 open. I might have the dev database open in one, and the production database open in another. These appear in the Windows task bar with the text "Microsoft SQL Serve...", which means it's impossible to differentiate between them unless I open the window and scroll the Object Explorer up to see what server the window is actually connected to. Is ther any way that I can get the window to display the server name first, and then the name of the application? Like "Dev-DB.database_name - Microsoft SQL Serve..." or whatever?

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• Is there a good web-based project management app with scheduling?

  - by Andykiteman

  Ideally something as intuitive as basecamp, with good usability and accessibility. The best I've seen is huddle.net but it's still weak in several areas. Must have: Projects - ability to add people & tasks and schedule tasks to people Calendar - showing when people are busy or available Role based access - Admins and non-admins History - ability to look back at all history Anyone seen a product that's worth a look? Clarification: Must be hosted i.e. not require my own hardware or IT staff I'm looking for an app to schedule people with specific tasks at specific times and monitor the outcomes. I'm already using Mingle (for stories), Basecamp (to run the business) and Exceptional (to track bugs). I'm not looking for a bug-tracking system or a story management application (I already looked at VersionOne, but chose Mingle due to it's nicer UI) My response to the answer being auto-selected: I still don't feel the answer (chosen for me) is the correct one. It's a useful list but little more, and doesn't provide the solution I was seeking.

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• Easy plugin or procedure for sqlserver Management Studio to script row inserts.

  - by Patrick Karcher

  I've never been able to find a good script or plugin for sql server Management Studio (2005 and or 2008) for a very common scripting need: specifying a few/all rows in a table and scripting their insert. You can guess my story: I've got some configuration data in my dev db and I need to script it for deployment to UAT and then production. I've found a few cludgy systems in the past, that were more trouble than they were worth. I need something free and unobtrusive. Once I find it I'll share it with the other 20 developers in my shop who are annoyed by this. Aren't we all annoyed by this by the way? What is the best, easiest, free, way to specify a few/all rows in a table and get a script their insert?

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• How would you advocate not using a shared spreadsheet to track bugs / issues ?

  - by Sylvain Defresne

  In our company, the developers want to use a proper bug tracking tool to manager issues in our application. The management however insists on using a shared spreadsheet (formeerly a shared excel file, now a spreadsheet on a web base solution allowing concurrent access). Their argument is that the spreadsheet allow them to have a more highlevel view of the state of the project as they can see how many bugs are open with a quick glance. This also allow them to see who is working on each bug, and get estimation of the time required to close them all (as developer are required to fill time estimation of the bug they are working on). As you can understand, this is not really practical to use for the developers (bug tracking software were invented for a reason). So how can I advocate bug tracking software to ease the work of the developer ? As a bonus, which software would you recommend that would allow the management to be able to get their feedbacks (number of bugs opens, who is working on them, time estimation) with a high level view ?

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• 5 tipologie di consumatori con cui confrontarsi per rendere vincenti le proprie strategie di CRM

  - by antonella.buonagurio(at)oracle.com

  Sono 5 le tipologie di consumatori che  rappresentano 5 differenti modalità di acquisto di cui le aziende devono tenere in considerazione nella pianificazione dei propri piani strategici del 2011. Oltre al "consumatore just-in-time", già citato in un precedente articolo apparso sul Wall Street Journal a Novembre ecco le altre tipologie evidenziate da Lioe Arussy (Strativity Group). Il consumatore alla ricerca degli sconti Il consumatore diffidente Il consumatore timoroso Il consumatore fai-da-te Il consumatore indulgente Per ognuno di queste categorie viene evidenziato il modello di comportamento e il conseguente modello di acquisto. Per saperne di più  

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• Iterative Conversion

  - by stuart ramage

  Question Received: I am toying with the idea of migrating the current information first and the remainder of the history at a later date. I have heard that the conversion tool copes with this, but haven't found any information on how it does. Answer: The Toolkit will support iterative conversions as long as the original master data key tables (the CK_* tables) are not cleared down from Staging (the already converted Transactional Data would need to be cleared down) and the Production instance being migrated into is actually Production (we have migrated into a pre-prod instance in the past and then unloaded this and loaded it into the real PROD instance, but this will not work for your situation. You need to be migrating directly into your intended environment). In this case the migration tool will still know all about the original keys and the generated keys for the primary objects (Account, SA, etc.) and as such it will be able to link the data converted as part of a second pass onto these entities. It should be noted that this may result in the original opening balances potentially being displayed with an incorrect value (if we are talking about Financial Transactions) and also that care will have to be taken to ensure that all related objects are aligned (eg. A Bill must have a set to bill segments, meter reads and a financial transactions, and these entities cannot exist independantly). It should also be noted that subsequent runs of the conversion tool would need to be 'trimmed' to ensure that they are only doing work on the objects affected. You would not want to revalidate and migrate all Person, Account, SA, SA/SP, SP and Premise details since this information has already been processed, but you would definitely want to run the affected transactional record validation and keygen processes. There is no real "hard-and-fast" rule around this processing since is it specific to each implmentations needs, but the majority of the effort required should be detailed in the Conversion Tool section of the online help (under Adminstration/ The Conversion Tool). The major rule is to ensure that you only run the steps and validation/keygen steps that you need and do not do a complete rerun for your subsequent conversion.

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• When should complexity be removed?

  - by ElGringoGrande

  Prematurely introducing complexity by implementing design patterns before they are needed is not good practice. But if you follow all (or even most of) the SOLID principles and use common design patterns you will introduce some complexity as features and requirements are added or changed to keep your design as maintainable and flexible as needed. However once that complexity is introduced and working like a champ when do you removed it? Example. I have an application written for a client. When originally created there where several ways to give raises to employees. I used the strategy pattern and factory to keep the whole process nice and clean. Over time certain raise methods where added or removed by the application owner. Time passes and new owner takes over. This new owner is hard nosed, keeps everything simple and only has one single way to give a raise. The complexity needed by the strategy pattern is no longer needed. If I where to code this from the requirements as they are now I would not introduce this extra complexity (but make sure I could introduce it with little or no work should the need arise). So do I remove the strategy implementation now? I don't think this new owner will ever change how raises are given. But the application itself has demonstrated that this could happen. Of course this is just one example in an application where a new owner takes over and has simplified many processes. I could remove dozens of classes, interfaces and factories and make the whole application much more simple. Note that the current implementation does works just fine and the owner is happy with it (and surprised and even happier that I was able to implement her changes so quickly because of the discussed complexity). I admit that a small part of this doubt is because it is highly likely the new owner isn't going to use me any longer. I don't really care that somebody else will take this over since it has not been a big income generator. But I do care about 2 (related) things I care a bit that the new maintainer will have to think a bit harder when trying to understand the code. Complexity is complexity and I don't want to anger the psycho maniac coming after me. But even more I worry about a competitor seeing this complexity and thinking I just implement design patterns to pad my hours on jobs. Then spreading this rumor to hurt my other business. (I have heard this mentioned.) So... In general should previously needed complexity be removed even though it works and there has been a historically demonstrated need for the complexity but you have no indication that it will be needed in the future? Even if the question above is generally answered "no" is it wise to remove this "un-needed" complexity if handing off the project to a competitor (or stranger)?

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• 5 tipologie di consumatori con cui confrontarsi per rendere vincenti le proprie strategie di CRM

  - by antonella.buonagurio(at)oracle.com

  Sono 5 le tipologie di consumatori che  rappresentano 5 differenti modalità di acquisto di cui le aziende devono tenere in considerazione nella pianificazione dei propri piani strategici del 2011. Oltre al "consumatore just-in-time", già citato in un precedente articolo apparso sul Wall Street Journal a Novembre ecco le altre tipologie evidenziate da Lioe Arussy (Strativity Group). Il consumatore alla ricerca degli sconti Il consumatore diffidente Il consumatore timoroso Il consumatore fai-da-te Il consumatore indulgente Per ognuno di queste categorie viene evidenziato il modello di comportamento e il conseguente modello di acquisto. Per saperne di più 

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• Is osTicket secure/private enough

  - by Andy

  I was going to use osTicket as my 'help desk' for my website, however I just got a little bit concerned when I realised that the clients' login details to see their support tickets are only their email address and a ticket ID. I am probably going over the top with security though, which is why I wanted to get some second opinions on how secure osTicket actually is and whether I should use it with my website. I run a software company, so chances are licence keys may be included in support tickets which are obviously sensitive information and valuable - so I want to ensure that the likelihood of a support ticket being hacked is very low. If there is any plugins/additions to make osTicket more 'secure', I would appreciate it if you could point me to them. Otherwise if there are any more free, more suited, help desk softwares out there please let me know. Thanks in advance

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• What would be a best way to code a rudimentary LIMS?

  - by Sam

  Hi, I hope that I am asking the right question at right place. If not, please do not hesitate to point me to the right place. I am working in a laboratory, where computers/programming/programmers are all used only as support. But I believe that we need better information organization and management. Given the diverse information generated in the lab I believe that we need some sort of Laboratory Information Management System. Is there a good starting point to do this? I am myself not a trained programmer. I can code reasonably well in python and R, and if necessary I can learn MySql, php.

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• how do I write a functional specification quickly and efficiently

  - by giddy

  So I just read some fabulous articles by Joel on specs here. (Was written in 2000!!) I read all 4 parts, but Im looking for some methodical approaches to writing my specs. Im the only lonely dev, working on this fairly complicated app (or family of apps) for a very well known finance company. I've never made something this serious, I started out writing something like a bad spec, an overview of some sorts, and it has wasted a LOT of my time. Ive also made 3 mockup-kinda-thingies for my client so I have a good understanding of what they want. Also released a preview (a throw away working app with the most basic workflow), and Ive only written and tested some of the very core/base systems. I think the mistake Ive been making so far is not writing a detailed spec, so Im getting to it now. So the whole thing comprises of An MVC website (for admins & data viewing) 2 Silverlight modules (For 2 specific tasks) 1 Desktop Application Im totally short on time, resources and need to get this done quick, also, need to make sure these guys read it up equally quick and painlessly. So how do I go about it, Im looking for any tips, any real world stuff, how do you guys usually do it? Do you make a mock screenie of every dialog/form/page? Im thinking of making a dummy asp.net web forms project, then filling in html files in folders and making it look like my mvc url structure. Then having a section in the spec for the website and write up a page for every URL Ive got with a screenie. For my win forms app, Ive made somewhat of a demo Win Form project, would I then put in a dialog or stucture everything as I would in the real app and then screen shot it?

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• Webcast Reminder: Implementing IDM in Healthcare, September 19th @10:00 am PST

  - by Darin Pendergraft

  Join me and Rex Thexton from PwC tomorrow (September 19th) as we review an IDM project that Rex and his team completed for a large healthcare organization.  Rex will talk through the IT environment and business drivers that lead to the project, and then we will go through planning, design and implementation of the Oracle Identity Management products that PwC and the customer chose to complete the project. This will be a great opportunity to hear about the trends that are driving IT Healthcare, and to get your Identity Management questions answered. If you haven't already registered - Register Here!

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• Identity R2 in London Oct 24th with Amit Jasuja

  - by Naresh Persaud

  Join Amit Jasuja, Senior Vice President Identity Management and Security, Oracle, and Peter Boyle, Head of Identity Services, BT in London on 24th October 2012 for the UK launch of Oracle Identity Management 11gR2. You’ll learn more about the evolution of this exceptional business solution and get the unique opportunity to network with existing Oracle customers and speak directly with Oracle product experts The agenda includes: An overview of capabilities Product demonstrations Customer presentations An interactive panel discussion Amit Jasuja will also be available for 1:1 meetings. Please email [email protected] to request a meeting with Amit. Click here to Register. 

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• Tackling Security and Compliance Barriers with a Platform Approach to IDM: Featuring SuperValu

  - by Darin Pendergraft

  On October 25, 2012 ISACA and Oracle sponsored a webcast discussing how SUPERVALU has embraced the platform approach to IDM.  Scott Bonnell, Sr. Director of Product Management at Oracle, and Phil Black, Security Director for IAM at SUPERVALU discussed how a platform strategy could be used to formulate an upgrade plan for a large SUN IDM installation. See the webcast replay here: ISACA Webcast Replay (Requires Internet Explorer or Chrome) Some of the main points discussed in the webcast include: Getting support for an upgrade project by aligning with corporate initiatives How to leverage an existing IDM investment while planning for future growth How SUN and Oracle IDM architectures can be used in a coexistance strategy Advantages of a rationalized, modern, IDM Platform architecture ISACA Webcast Featuring SuperValu - Tackling Security and Compliance Barriers with a Platform Approach to Identity Management from OracleIDM  

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• What Should You Look for In a CRM Demo?

  - by charles.knapp

  I have helped firms evaluate software demos and delivered demos in diverse industries such as manufacturing, healthcare, life sciences, and travel (to name just a few). Here are a few suggestions. First, which vendor has the best fit for your industry? Make sure that the vendor demo staff tell you clearly throughout the demo (not just in a passing comment), what portion of each business process and screen is standard, what has been configured, what has been custom coded, and what has been provided by a partner. If you don't keep asking, what you buy may be less useful than what you saw. This will lead to added (and unbudgeted) costs and time. Second, what are the roles of the primary users? What are their top-most needs, such as exception-oriented dashboards or rapid data entry? Can you get a demo for each key role, showing how the software fits a typical workday? Have the vendor repeatedly tell you what is standard, configured, custom coded, or provided by a partner. Third, how well does the demo balance ease of use with completeness of business processes? One common approach is to hide needed fields or steps that are of low visual value. Another approach is to focus heavily on a visually appealing capability, while downplaying the fit with your key business processes. Result: despite their business acumen, demo attendees may not focus adequately on gaps in business fit So, look for complete disclosure and complete CRM. To arrange a demo from Oracle, please visit http://www.oracle.com/crm.

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