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• Simple Database normalization question...

  - by user365531

  Hi all, I have a quick question regarding a database that I am designing and making sure it is normalized... I have a customer table, with a primary key of customerId. It has a StatusCode column that has a code which reflects the customers account status ie. 1 = Open, 2 = Closed, 3 = Suspended etc... Now I would like to have another field in the customer table that flags whether the account is allowed to be suspended or not... certain customers will be automatically suspended if they break there trading terms... others not... so the relevant table fields will be as so: Customers (CustomerId(PK):StatusCode:IsSuspensionAllowed) Now both fields are dependent on the primary key as you can not determine the status or whether suspensions are allowed on a particular customer unless you know the specific customer, except of course when the IsSuspensionAllowed field is set to YES, the the customer should never have a StatusCode of 3 (Suspended). It seems from the above table design it is possible for this to happen unless a check contraint is added to my table. I can't see how another table could be added to the relational design to enforce this though as it's only in the case where IsSuspensionAllowed is set to YES and StatusCode is set to 3 when the two have a dependence on each other. So after my long winded explanation my question is this: Is this a normalization problem and I'm not seeing a relational design that will enforce this... or is it actually just a business rule that should be enforced with a check contraint and the table is in fact still normalized. Cheers, Steve

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• MVC Persist Collection ViewModel (Update, Delete, Insert)

  - by Riccardo Bassilichi

  In order to create a more elegant solution I'm curios to know your suggestion about a solution to persist a collection. I've a collection stored on DB. This collection go to a webpage in a viewmodel. When the go back from the webpage to the controller I need to persist the modified collection to the same DB. The simple solution is to delete the stored collection and recreate all rows. I need a more elegant solution to mix the collections and delete not present record, update similar records ad insert new rows. this is my Models and ViewModels. public class CustomerModel { public virtual string Id { get; set; } public virtual string Name { get; set; } public virtual IList<PreferredAirportModel> PreferedAirports { get; set; } } public class AirportModel { public virtual string Id { get; set; } public virtual string AirportName { get; set; } } public class PreferredAirportModel { public virtual AirportModel Airport { get; set; } public virtual int CheckInMinutes { get; set; } } // ViewModels public class CustomerViewModel { [Required] public virtual string Id { get; set; } public virtual string Name { get; set; } public virtual IList<PreferredAirporViewtModel> PreferedAirports { get; set; } } public class PreferredAirporViewtModel { [Required] public virtual string AirportId { get; set; } [Required] public virtual int CheckInMinutes { get; set; } } And this is the controller with not elegant solution. public class CustomerController { public ActionResult Save(string id, CustomerViewModel viewModel) { var session = SessionFactory.CurrentSession; var customer = session.Query<CustomerModel>().SingleOrDefault(el => el.Id == id); customer.Name = viewModel.Name; // How cai I Merge collections handling delete, update and inserts ? var modifiedPreferedAirports = new List<PreferredAirportModel>(); var modifiedPreferedAirportsVm = new List<PreferredAirporViewtModel>(); // Update every common Airport foreach (var airport in viewModel.PreferedAirports) { foreach (var custPa in customer.PreferedAirports) { if (custPa.Airport.Id == airport.AirportId) { modifiedPreferedAirports.Add(custPa); modifiedPreferedAirportsVm.Add(airport); custPa.CheckInMinutes = airport.CheckInMinutes; } } } // Remove common airports from ViewModel modifiedPreferedAirportsVm.ForEach(el => viewModel.PreferedAirports.Remove(el)); // Remove deleted airports from model var toDelete = customer.PreferedAirports.Except(modifiedPreferedAirports); toDelete.ForEach(el => customer.PreferedAirports.Remove(el)); // Add new Airports var toAdd = viewModel.PreferedAirports.Select(el => new PreferredAirportModel { Airport = session.Query<AirportModel>(). SingleOrDefault(a => a.Id == el.AirportId), CheckInMinutes = el.CheckInMinutes }); toAdd.ForEach(el => customer.PreferedAirports.Add(el)); session.Save(customer); return View(); } } My environment is ASP.NET MVC 4, nHibernate, Automapper, SQL Server. Thank You!!

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• Rails: Getting rid of "X is invalid" validation errors

  - by DJTripleThreat

  I have a sign-up form that has nested associations/attributes whatever you want to call them. My Hierarchy is this: class User < ActiveRecord::Base acts_as_authentic belongs_to :user_role, :polymorphic => true end class Customer < ActiveRecord::Base has_one :user, :as => :user_role, :dependent => :destroy accepts_nested_attributes_for :user, :allow_destroy => true validates_associated :user end class Employee < ActiveRecord::Base has_one :user, :as => :user_role, :dependent => :destroy accepts_nested_attributes_for :user, :allow_destroy => true validates_associated :user end I have some validation stuff in these classes as well. My problem is that if I try to create and Customer (or Employee etc) with a blank form I get all of the validation errors I should get plus some Generic ones like "User is invalid" and "Customer is invalid" If I iterate through the errors I get something like: user.login can't be blank User is invalid customer.whatever is blah blah blah...etc customer.some_other_error etc etc Since there is at least one invalid field in the nested User model, an extra "X is invalid" message is added to the list of errors. This gets confusing to my client and so I'm wondering if there is a quick way to do this instead of having to filer through the errors myself.

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• What is a right way to use servlets?

  - by vikp

  Hi, I'm studying EJB3. I have a session bean which provides services to create/update customer accounts. This session bean offers services on the lines of: public void addCustomer(Customer c); public void updateCustomer(Customer c); Ideally I'd like to have a single servlet: CustomerServlet and it would invoke the session beans that I have listed above. Problem is that I have two JSPs: UpdateAccount.jsp and CreateAccount.jsp. Both of these JSPs have a form with a method POST and action "CustomerServlet". How can I distinguish in a customer servlet which operation I should carry out: createAccount or updateAccount? I guess the alternative is to have a separate servlet for each operation... Thank you

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• named route (RESTful) for actions other than index, delete, create, and edit

  - by Hadi

  To illustrate: class Customer has_many :sales_orders end class SalesOrder belongs_to :customer end i want to have customer to list sales_order which is ready to be sent, should i: put the routing http://.../sales_orders/can_be_delivered or create a new controller for reporting http://.../reports/sales_orders_can_be_delivered for the 1st one, what should goes in the route.rb? for the 2nd one, nothing goes in route.rb, we can use the last defined route which is :controller/:action.. <-- but this isn't named route any ideas for this kind of problem?

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• XPath: How to check multiple attributes across similar nodes

  - by Justin

  Hi, If I have some xml like: <root> <customers> <customer firstname="Joe" lastname="Bloggs" description="Member of the Bloggs family"/> <customer firstname="Joe" lastname="Soap" description="Member of the Soap family"/> <customer firstname="Fred" lastname="Bloggs" description="Member of the Bloggs family"/> <customer firstname="Jane" lastname="Bloggs" description="Is a member of the Bloggs family"/> </customers> </root> How do I get, in pure XPath - not XSLT - an xpath expression that detects rows where lastname is the same, but has a different description? So it would pull the last node above? Thanks a mill if you can help, been scratching at it for ages, and I can't find it by searching (apologies if it is) Cheers, J

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• SQL Server 2008 - Search Query

  - by user208662

  Hello, I am not a SQL Expert. I’m trying to elegantly solve a query problem that others have had to have had. Surprisingly, Google is not returning anything that is helping. Basically, my application has a “search” box. This search field will allow a user to search for customers in the system. I have a table called “Customer” in my SQL Server 2008 database. This table is defined as follows: Customer UserName (nvarchar) FirstName (nvarchar) LastName (nvarchar) As you can imagine, my users will enter queries of varying cases and probably mis-spell the customer’s names regularly. How do I query my customer table and return the 25 results that are closest to their query? I have no idea how to do this ranking and consider the three fields listed in my table. Thank you!

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• Can we get the information of customers who have purchased our application from app store ?

  - by Hiren Gujarati

  Can we get information of all customers like customer's name, customer's email or other information related with customer who have purchased our application from app store ???

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• MS Access Mark Duplicates in order of appearance - using the function RankOfDup: (SELECT Count(*) ...)

  - by veska stoyanova

  I'm trying to create Ranking that shows the sequence of agreements for the two fields Customers and Agreements. The number for agreements must be unique, whereas customers can repeat. The formula RankOfDup: (SELECT Count(*) FROM Data a WHERE a.customer=Data.customer And a.agreement >= Data.agreement) Works beautifully but after this query with columns Agreement, Customer and RankofDup, I need to create crosstab that transposes the RankofDub. It works when I make the table first and then create query but my data is too large so I'm trying to put the select query with the ranking in a crosstab query. However, when I try to do this Access gives error message that microsoft jet ... doesn't recognise Data.customer? Any ideas how I can fix this?

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• SQL query to return data from two separate rows in a table joined to a master table

  - by Ali

  I have a TWO tables of data with following fields table1=(ITTAG,ITCODE,ITDESC,SUPcode) table2=(ACCODE,ACNAME,ROUTE,SALMAN) This is my customer master table that contains my customer data such as customer code, customer name and so on... Every Route has a supervisor (table1=supcode) and I need to know the supervisor name in my table which both supervisor name and code exist in one table. table1 has contain all names separated by ITTAG. For example, supervisor's name has ITTAG='K'; also salesman's name has ITTAG='S'. ITTAG ITCODE ITDESC SUPCODE ------ ------ ------ ------- S JT JOHN TOMAS TF K WK VIKI KOO NULL Now this is the result which I want ACCODE ACNAME ROUTE SALEMANNAME SUPERVISORNAME ------- ------ ------ ------------ --------------- IMC1010 ABC HOTEL 01 JOHN TOMAS VIKI KOO I hope this this information is sufficient to get the query..

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• Problem with continue in While Loop within Try/Catch in C# (2.0)

  - by csharpnoob

  Hi, when i try to use in my ASPX Webpage in the Code Behind this try{ while() { ... db.Open(); readDataMoney = new OleDbCommand("SELECT * FROM Customer WHERE card = '" + customer.card + "';", db).ExecuteReader(); while (readDataMoney.Read()) { try { if (!readDataMoney.IsDBNull(readDataMoney.GetOrdinal("Credit"))) { customer.credit = Convert.ToDouble(readDataMoney[readDataMoney.GetOrdinal("Credit")]); } if (!readDataMoney.IsDBNull(readDataMoney.GetOrdinal("Bonus"))) { customer.bonus = Convert.ToDouble(readDataMoney[readDataMoney.GetOrdinal("Bonus")]); } } catch (Exception ex) { Connector.writeLog("Money: " + ex.StackTrace + "" + ex.Message + "" + ex.Source); customer.credit = 0.0; customer.credit = 0.0; continue; } finally { } } readDataMoney.Close(); vsiDB.Close(); ... } }catch { continue; } The whole page hangs if there is a problem when the read from db isn't working. I tried to check for !isNull, but same problem. I have a lots of differend MDB Files to process, which are readonly (can't repair/compact) and some or others not. Same Design/Layout of Tables. With good old ASP Classic 3.0 all of them are processing with the "On Resume Next". I know I know. But that's how it is. Can't change the source. So the basic question: So is there any way to tell .NET to continue the loop whatever happens within the try loop if there is any exception? After a lots of wating time i get this exceptions: at System.Data.Common.UnsafeNativeMethods.IDBInitializeInitialize.Invoke(IntPtr pThis) at System.Data.OleDb.DataSourceWrapper.InitializeAndCreateSession(OleDbConnectionString constr, SessionWrapper& sessionWrapper) at System.Data.OleDb.OleDbConnectionInternal..ctor(OleDbConnectionString constr, OleDbConnection connection) at System.Data.OleDb.OleDbConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningObject) at System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup) at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) at System.Data.OleDb.OleDbConnection.Open() at GetCustomer(String card)Thread was being aborted.System.Data and System.Runtime.InteropServices.Marshal.ReadInt16(IntPtr ptr, Int32 ofs) System.Data.ProviderBase.DbBuffer.ReadInt16(Int32 offset) System.Data.OleDb.ColumnBinding.Value_I2() System.Data.OleDb.ColumnBinding.Value() System.Data.OleDb.OleDbDataReader.GetValue(Int32 ordinal) System.Data.OleDb.OleDbDataReader.get_Item(Int32 index) Thread was terminated.mscorlib Thanks for any help.

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• Ad distribution problem: an optimal solution?

  - by Mokuchan

  I'm asked to find a 2 approximate solution to this problem: You’re consulting for an e-commerce site that receives a large number of visitors each day. For each visitor i, where i € {1, 2 ..... n}, the site has assigned a value v[i], representing the expected revenue that can be obtained from this customer. Each visitor i is shown one of m possible ads A1, A2 ..... An as they enter the site. The site wants a selection of one ad for each customer so that each ad is seen, overall, by a set of customers of reasonably large total weight. Thus, given a selection of one ad for each customer, we will define the spread of this selection to be the minimum, over j = 1, 2 ..... m, of the total weight of all customers who were shown ad Aj. Example Suppose there are six customers with values 3, 4, 12, 2, 4, 6, and there are m = 3 ads. Then, in this instance, one could achieve a spread of 9 by showing ad A1 to customers 1, 2, 4, ad A2 to customer 3, and ad A3 to customers 5 and 6. The ultimate goal is to find a selection of an ad for each customer that maximizes the spread. Unfortunately, this optimization problem is NP-hard (you don’t have to prove this). So instead give a polynomial-time algorithm that approximates the maximum spread within a factor of 2. The solution I found is the following: Order visitors values in descending order Add the next visitor value (i.e. assign the visitor) to the Ad with the current lowest total value Repeat This solution actually seems to always find the optimal solution, or I simply can't find a counterexample. Can you find it? Is this a non-polinomial solution and I just can't see it?

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• Two Phase Commit with MongoDB

  - by mattcodes

  Heres what Im thinking. Do you see any issues with this workaround to emulate 2 phase commit when using something like MongoDB where each operation is atomic and there is no support for transactions outside of that? transaction_scope: read message from servicebus - UpdateCustomerAddress get customer aggregate from docdb, replay events where commited =1 call customer.updateAddress validates creates customer address updated event apply event event store as uncommitted events do optimistic concurrency update against docdb pushing uncommitted events (single op to ensure consistency) publish event to service bus update docdb set events just published to commited = 1 (again one 1 op - at least in mongodb) transaction_complete

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• Rails: Getting rid of generic "X is invalid" validation errors

  - by DJTripleThreat

  I have a sign-up form that has nested associations/attributes whatever you want to call them. My Hierarchy is this: class User < ActiveRecord::Base acts_as_authentic belongs_to :user_role, :polymorphic => true end class Customer < ActiveRecord::Base has_one :user, :as => :user_role, :dependent => :destroy accepts_nested_attributes_for :user, :allow_destroy => true validates_associated :user end class Employee < ActiveRecord::Base has_one :user, :as => :user_role, :dependent => :destroy accepts_nested_attributes_for :user, :allow_destroy => true validates_associated :user end I have some validation stuff in these classes as well. My problem is that if I try to create and Customer (or Employee etc) with a blank form I get all of the validation errors I should get plus some Generic ones like "User is invalid" and "Customer is invalid" If I iterate through the errors I get something like: user.login can't be blank User is invalid customer.whatever is blah blah blah...etc customer.some_other_error etc etc Since there is at least one invalid field in the nested User model, an extra "X is invalid" message is added to the list of errors. This gets confusing to my client and so I'm wondering if there is a quick way to do this instead of having to filer through the errors myself.

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• Ruby on Rails and database associations

  - by Marco

  Hi to all, I'm new to the Ruby world, and there is something unclear to me in defining associations between models. The question is: where is the association saved? For example, if i create a Customer model by executing: generate model Customer name:string age:integer and then i create an Order model generate model Order description:text quantity:integer and then i set the association in the following way: class Customer < ActiveRecord::Base has_many :orders end class Order < ActiveRecord::Base belongs_to :customer end I think here is missing something, for example the foreign key between the two entities. How does it handle the associations created with the keywords "has_many" and "belongs_to" ? Thanks

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• Different cache concurrent strategies for root entity and its collection (Hibernate with EHCache)?

  - by grigory

  Given example from Hibernate docs and modifying it so that root level entity (Customer) is read-only while one of its collections (tickets) is read-write: @Entity @Cache(usage = CacheConcurrencyStrategy.READ_ONLY) public class Customer { ... @OneToMany(...) @Cache(usage = CacheConcurrencyStrategy.READ_WRITE) public SortedSet<Ticket> getTickets() { return tickets; } ... } Would collection of tickets get refreshed when accessing customer from cache?

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• How do I let a user sign in from a different domain on Authlogic?

  - by Newy

  [This is slightly different than a previous question about having multiple domains share the same cookie. It seemed like there wasn't an easy way to do that.] I have a application at application.com. A customer has app.customer.com pointed at my site on Heroku, and I have everything set up so that it renders a specific version of app correctly. The issue is that I want a user at app.customer.com to be able to login. I believe authlogic is now setting the cookie on application.com, so while it verifies the credentials, no session on customer.com is ever created.

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• Getting value of "System.Windows.Controls.TextBlock" when binding to Silverlight ComboBox

  - by sipwiz

  I'm attempting to use a Silverlight ComboBox with a static list of elements in a very simple binding scenario. The problem is the selected item is not returning me the Text of the TextBlock within the ComboBox and is instead returning "System.Windows.Controls.TextBlock". My XAML is: <ComboBox SelectedValue="{Binding Country, Mode=TwoWay, NotifyOnValidationError=True, ValidatesOnExceptions=True}"> <TextBlock FontSize="11" Text="Afghanistan" /> <TextBlock FontSize="11" Text="Albania" /> <TextBlock FontSize="11" Text="Algeria" /> </ComboBox> In my C# file I'm binding to the ComboBox using: Customer customer = new Customer() { Country = "Albania" }; DataContext = customer; The binding does not result in Albania as the selected country and updating the ComboBox choice results in the Country being set to "System.Windows.Controls.TextBlock". I've tried fiddling around with DisplayMemberPath and SelectedValuePath but haven't found the answer. I suspect it's something really simple I'm missing.

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• Need help optimizing a NHibernate criteria query that uses Restrictions.In(..)

  - by Chris F

  I'm trying to figure out if there's a way I can do the following strictly using Criteria and DetachedCriteria via a subquery or some other way that is more optimal. NameGuidDto is nothing more than a lightweight object that has string and Guid properties. public IList<NameGuidDto> GetByManager(Employee manager) { // First, grab all of the Customers where the employee is a backup manager. // Access customers that are primarily managed via manager.ManagedCustomers. // I need this list to pass to Restrictions.In(..) below, but can I do it better? Guid[] customerIds = new Guid[manager.BackedCustomers.Count]; int count = 0; foreach (Customer customer in manager.BackedCustomers) { customerIds[count++] = customer.Id; } ICriteria criteria = Session.CreateCriteria(typeof(Customer)) .Add(Restrictions.Disjunction() .Add(Restrictions.Eq("Manager", manager)) .Add(Restrictions.In("Id", customerIds))) .SetProjection(Projections.ProjectionList() .Add(Projections.Property("Name"), "Name") .Add(Projections.Property("Id"), "Guid")) // Transform results to NameGuidDto criteria.SetResultTransformer(Transformers.AliasToBean(typeof(NameGuidDto))); return criteria.List<NameGuidDto>(); }

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• NHibernate - define where condition

  - by t.kehl

  Hi. In my application the user can defines search-conditions. He can choose a column, set an operator (equals, like, greater than, less or equal than, etc.) and give in the value. After the user clicks on a button and the application should do a search on the database with the condition. I use NHibernate and ask me now, what is the efficientest way to do this with NHibernate. Should I create a query with it like (Column=Name, Operator=Like, Value=%John%) var a = session.CreateCriteria<Customer>(); a.Add(Restrictions.Like("Name", "%John%")); return a.List<Customer>(); Or should I do this with HQL: var q = session.CreateQuery("from Customer where " + where); return q.List<Customer >(); Or is there a more bether solution? Thanks for your help. Best Regards, Thomas

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• MVC-style model binding in WCF?

  - by Mark

  I want to bind POSTed form values to parameters in my WCF operation in the same way that ASP.Net MVC allows me to do. So, for example if my form has "customer.Name" and "customer.Age" parameters, I want to make a standard HTML POST to a named endpoint/operation that takes a customer parameter and have it instantiated and populated like MVC can do... It looks like I can use WebInvoke and its UriTemplate property to map simple parameters - does anyone know if a more MVC-like model-binding way is possible? Thanks, Mark.

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• update query with join on two tables

  - by dba_query

  I have customer and address tables. query: select * from addresses a, customers b where a.id = b.id returns 474 records For these records, I'd like to add the id of customer table into cid of address table. Example: If for the first record the id of customer is 9 and id of address is also 9 then i'd like to insert 9 into cid column of address table. I tried: update addresses a, customers b set a.cid = b.id where a.id = b.id but this does not seem to work.

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• WSDL first for existing service layer

  - by Jurgen H

  I am working on an existing Java project with a typical services - dao setup for which only a webapplication was available. My job is to add webservices on top of the services layer, but the webservices have their own functional analysis and datamodel. The functional analyses ofcource focuses on what is possible in the different service methods. As good practice demands, we used the WSDL first strategy and generated JAXB bound Java classes and a SEI for the webservices. After having implemented the webservices partially, we noticed a 70% match between the datamodel. This resulted in writing converters which take the webservice JAXB classes and map them with the service layer classes. Customer customer = new Customer(); customer.setName(wsCustomer.getName()); customer.setFirstName(wsCustomer.getFirstName(); .. This is a very obvious example, some other mappings where little more complicated. Can anyone give his best practices, experiences, solutions to this kind of situations? Are any of these frameworks usefull? http://transmorph.sourceforge.net/wiki/index.php/Main_Page http://ezmorph.sourceforge.net/ Please don't start a discussion about WSDL first vs code first.

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• Rails: Design Pattern to Store Order of Relations

  - by ChrisInCambo

  Hi, I have four models: Customer, QueueRed, QueueBlue, QueueGreen. The Queue models have a one to many relationship with customers A customer must always be in a queue A customer can only be in one queue at a time A customer can change queues We must be able to find out the customers current position in their respective queue In an object model the queues would just have an array property containing customers, but ActiveRecord doesn't have arrays. In a DB I would probably create some extra tables just to handle the order of the stories in the queue. My question is what it the best way to model the relationship in ActiveRecord? Obviously there are many ways this could be done, but what is the best or the most in line with how ActiveRecord should be used? Cheers, Chris

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• Use MySQL trigger to update another table when duplicate key found

  - by Jason

  Been scratching my head on this one, hoping one of you kind people and direct me towards solving this problem. I have a mysql table of customers, it contains a lot of data, but for the purpose of this question, we only need to worry about 4 columns 'ID', 'Firstname', 'Lastname', 'Postcode' Problem is, the table contains a lot of duplicated customers. A new table is being created where each customer is unique and for us, we decide a unique customer is based on 'Firstname', 'Lastname' and 'Postcode' However, (this is the important bit) we need to ensure each new "unique" customer record also can be matched to the original multiple entries of that customer in the original table. I believe the best way to do this is to have a third table, that has 'NewUniqueID', 'OldCustomerID'. So we can search this table for 'NewUniqueID' = '123' and it would return multiple 'OldCustomerID' values where appropriate. I am hoping to make this work using a trigger and the on duplicate key syntax. So what would happen is as follows: An query is run taking the old customer table and inserting it in to the new unique table. (A standard Insert Select query) On duplicate key continue adding records, but add one entry in to the third table noting the 'NewUniqueID' that duped along with the 'OldCustomerID' of the record we were trying to insert. Hope this makes sense, my apologies if it isn't clear. I welcome and appreciate any thoughts on this one! Many thanks Jason

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