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• retriving python objects ...python newbie

  - by gizgok

  I have a Club class and Player Class.The player class has an attribute Fav.clubs which will have unique club values.So the user is suppose to enter various club names.Based on the club names I have to retrieve those club objects and establish the relationship that this particular player has this Fav.clubs.The attribute Fav.clubs in Player class should store the names of Club .Now what I have to do is,take input from user about fav.clubs.This will be a list.After that traverse each element in the list and acc to string name find the corresponding club object and then store that object instance in Player class.

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• Entity Framework - How do create an association to/from the same entity?

  - by Greg

  Hi, In Entity Framework (VS2010) how do I create an association to/from the same table? (a many-to-many is what I want) Background - I was expecting under the bonnet a NODE and RELATIONSHIP table, where the latter has a parent_node_id and a child_node_id (i.e. pointing back to the NODE id column). I can't seem to get the designer to add it...

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• Hbase and 1- Many Relation

  - by Shuja

  Hi All I have one question which can be best described by the following scenario. Suppose I have three tables BaseCategory,Category and products. If i am thinking in terms of RDBMS then the relationship amoung these tables are 1- One BaseCategory has Many categories 2- One Category has Many Products. Now i am thinking to convert it into HBase. can anybody help me how to map these relations into HBase?

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• How to select parent row only if has at least one child?

  - by Matt McCormick

  I have a simple one-to-many relationship. I would like to select rows from the parent only when they have at least one child. So, if there are no children, then the parent row is not returned in the result set. Eg. Parent: +--+---------+ |id| text | +--+---------+ | 1| Blah | | 2| Blah2 | | 3| Blah3 | +--+---------+ Children +--+------+-------+ |id|parent| other | +--+------+-------+ | 1| 1 | blah | | 2| 1 | blah2 | | 3| 2 | blah3 | +--+------+-------+ I want the results to be: +----+------+ |p.id|p.text| +----+------+ | 1 | Blah | | 2 | Blah2| +----+------+

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• how to call include

  - by user276640

  i have 3 tables with such relationship table1-table2-table3 in code i call include("table2"). but how can i call include table3 so i can access to properties of objects table3? if i call include("table3") it show error A specified Include path is not valid

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• Many returned records cause stackoverflow with Hibernate

  - by mimi law

  If there are many return records from DB. It will get stackoverflow problem. User is a class, which has a one to many relationship (to 3 other classes). When I print out the SQL, i found that the system runs the same query many time to get the data from DB. Does anyone know what the problem is? result.addAll(getCurrentSession().createCriteria(User.class) .add(Restrictions.ilike("name", "tom", MatchMode.ANYWHERE)) .setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY) .list());

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• Should I define models that will be owned by many different models or use controller and views?

  - by jgervin

  I am struggling to figure out how to get a relationship between several models. I have sales_leads which I need to view by company and by event. So if someone looks up the leads by company they can see all leads across all events, but also see all leads by event. Not sure if this is ownership versus a where? Should it be something like Company.sales_leads where("event.event_id = ?", "2356") Or Models: sales_lead belongs_to event belongs_to company

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• Which free and open source frameworks would you recommend for replacing which aspect of ATG

  - by Vihung

  ATG (http://www.atg.com) is a frameowrk, a platform and a solution for content presentation and management, personalisation, e-commerce and customer relationship management. Which free and open source frameworks or products would you recommend to replace the basic functionality it provides? In the spirit of Stack Overflow, can you answer with one item in each answer and use the voting rather than duplicating someone else's answer. I have started with some answers

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• What is the best schema design for child collection with a "primary" entity

  - by erg39

  Here is the scenario: You have a Persons table with a one-to-many relationship with an Addresses table, where one of the Address rows is the "primary" Address. Is it better in a normalized schema to Use a Persons.PrimaryAddressID to access the "primary" Address for a Person or Use an Addresses.IsPrimary bit column to reference the "primary" Address for a Person via Addresses.PersonID or Other and why?

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• What is the difference between a mixin and the decorator pattern?

  - by leeand00

  The Decorator Pattern is dynamic extension-at-runtime of classes. It dynamically forms a is-a relationship. I started to wonder if I was over-complicating my API by using the Decorator Pattern after I got this answer about the difference between a mixin and an abstract class.

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• Querying with foreign key

  - by theactiveactor

  Say I have 2 tables whose structures are as follows: tableA id | A1 | A2 tableB id | tableA_id (foreign key) | B1 Entries in A have a one-to-many relationship with entries in B. What kind of query operation would I need to achieve "something like this: select all objects from table B where A1="foo""? Basically, apply a query on tableA and from those result, find corresponding dependent objects in tableB

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• asp.net membership db. Adding branches to a user

  - by diver-d

  Hi everyone, I am playing around with the membership database and have a question. Lets say I have a company called company ABC. There are 10 branches that belong to comapany ABC. IS there anyway to create a relationship within the database using company ABC as the parent and having the 10 branches as childs? I hope that makes sense :)

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• Mapping @OneToOne with @Where clause

  - by Gabriel

  I am trying to map an entity as following @OneToOne(mappedBy = "localizedLabel") @JoinColumn(insertable = false, updatable = false) @WhereJoinTable(clause = "locale='en_US'") public Localization getEn_US() { return en_US; } I can assure that the data will return only one or null if the not found, but hibernate seems to ignore my @Where clause: ERROR com.eventtouch.bc.business.core.log.LoggingInterceptor - org.hibernate.HibernateException: More than one row with the given identifier was found: 4211, for class: com.eventtouch.bc.business.domain.LocalizedLabel Any ideas on ho to map a @OneToOne relationship with @Where clause? Thanks

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• EclipseLink: onetomany relationships with lazy loading loaded with serialization

  - by Manuele Piastra

  Hello, I'm facing a problem with eclipselink under websphere 7.0 in a clustered environment. When my entity is serialized every 1-n relationship lazy is loaded, even if the entity is detached. How can I avoid this behavior, without having to use DTO? Thank you very much

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• Basic Database Design

  - by Thurein

  Hi, This question would be a bit childish, I have three tables, users, usergroups and contacts. In my system, the end user can create a contact and subsequently he\she may define the visibility of the contact by setting only for that user, or for a set of users or a set of usergroups. So I am wondering, how my database design would be, it should be many to many between users and contacts or many to many between usergroups and contacts. Definitely there is a one to many relationship between users and usergroups. Thanks Thurein

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• How to get all the descendants of a given instance of a model in google app engine?

  - by M.A. Cape

  Using parent child relationship where a parent can have children while each child has only one parent, does using Children.all().ancestor(parent.key) a good solution where a child is constructed by setting parent=parent.key in the constructor? Is the 1000 limit applies with this kind of query?

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• rails checkbox has_many is hunted

  - by sebajb

  check_box is hunted in rails; but I would like to select some objects and save the relationship to the database anyways. When I debug the code all I see is the value='on' instead of the value I want to save. Any Help or tutorial would be appreciated.

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• Where clause in nhibernate map

  - by Phil Whittaker

  I have an Nhibernate hbm that maps a many to many relationship. For database simplicity it uses a where clause on the bag to filter the joining table. this works well until I start to test and I use the hbm file to create a database from the generated schema. The root and user tags columns aren't created. In the hbm file how do I define these two columns so they are generated in the schema?

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• entity framework join

  - by Luca Romagnoli

  Hi, i have 2 table (user, user_profile) without a explicit relationship in the sql db. and i can't add it to the db. so, i can't do this: db.user.include("user_profile") the attribute in for the join is user_id is possible do anything like this? db.user.join("user_profile On user.id = user_profile.user_id") How can i do that? thanks

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• How do I get Enterprise Achitect to use correct class relationships when importing java source code?

  - by Sam

  I've just imported some java source into 'Enterprise Architect', e.g: class Truck { BumperSticker bumperSticker; Vector<Wheel> wheels; } It's added the first member as an association, and it hasn't added the second as a relationship at all. How do I get it to instead, add them both as aggregations, the second with a multiplicity of '*'?

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• Big O and Little o

  - by hyperdude

  If algorithm A has complexity O(n) and algorithm B has complexity o(n^2), what, if anything, can we say about the relationship between A and B? Note: the complexity of A is expressed using big-Oh, and the complexity of B is expressed using little-Oh.

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• UML - Object Method Returns a Collection

  - by derekerdmann

  How can I indicate that a method will return a collection of objects in UML? Is there a better way to explain the relationship than to have a collection class as a return type?

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• Reading POM's with it's children

  - by khmarbaise

  Based on the post it is mentioned (By Brett Porter) that a POM can be read. What i need is to read not only a single pom. I need to read the whole tree of pom's in a multimodule build. Starting with the root pom and it should read automatically the child pom's if it's possible? I need to do this in separate Java Code not in relationship with Maven itself.

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• Django display manytomany field in form when definition is on other model

  - by John

  Hi I have the definition for my manytomany relationship on one model but want to display the field on the form of my other model. How do I do this? for example: # classes class modelA(models.Model): name = models.CharField(max_length=300) manytomany = models.ManyToManyField(modelA) class modelB(models.Model): name = models.CharField(max_length=300) # forms class modelBForm(forms.ModelForm): class Meta: model = modelB If I then used modelBForm it would show a select box with the models from modelA rather than just name. Thanks

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• Fluent Nhibernate napping to existing database with primary key in joining table of a many to many r

  - by Todd

  I have an existing database with a many to many relationship however the joining table has a primary key ID and 2 foreign keys to do the join. Is it possible to configure the mapping files to handle this? at the moment i am stuck. Thanks

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