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• Tag, comment, rating, etc. database design

  - by Efe Kaptan

  I want to implement modules such as comment, rating, tag, etc. to my entities. What I thought was: comments_table - comment_id, comment_text entity1 - entitity1_id, entity1_text entity2 - entitity2_id, entity2_text entity1_comments - entity1_id, comment_id entity2_comments - entity2_id, comment_id .... Is this approach correct?

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• Criteria queries in EJB 3

  - by contexte

  Can I use Criteria queries with EJB3 entities? If so, how can I combine them with EntityManager?

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• Cascading IEquatable(Of T)

  - by Shimmy

  Hello! I have several entities I need to make IEquatable(Of TEntity) respectively. I want them first to check equality between EntityId, then if both are zero, should check regarding to other properties, for example same contact names, same phone number etc. How is this done?

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• htmlentities() in MySQL

  - by gAMBOOKa

  I've got regexes inserted directly into a MySQL database, how do I convert html entities to their safe equivalents using a MySQL query? EDI: The data is already in the database.

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• Examples of good JPA Java Desktop Application

  - by Yatendra Goel

  I have learnt JPA recently. Now I want to use it in one of my commercial product. But before proceeding, I want to see some example JPA Java Desktop applications so as to have a better understanding of using JPA in desktop applications. I have searched google for this but all I found was tutorials on JPA with examples of entities. I need some good real java desktop applications which have used JPA.

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• How do I map common properties in NHibernate

  - by Ian Oakes

  In the database I'm working with, every table repeats the same nine columns and I don't want to have to supply the same properties in each of my entities to map these columns. I've tried adding properties to a common base class and adding them to the sub class's mapping file, but this doesn't work. I've read the documentation around inheritance mapping but this did not help. What is the best way to map columns that repeat accross multiple tables in NHibernate?

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• Mapping of interconnection with nhibernate

  - by Mauro Destro

  I have to describe interconnection between objects. public class Entity { public string Name {get;set;} public IList<Entity> Connections {get;set;} } How can i persist this? I add another layer of complexity: querying on a specific date a connection between two entities can't be already defined. So probably I need a support table that contain a structure like Id, Source, Destination, ValidFrom, ValidUntil Mauro

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• get Generic CRUD operation in EF

  - by kathy

  Hello, Is there any way or design pattern can I use to get Generic CRUD operations? Because I’m working on n-tire application using EF in the data layer and I don’t want to use CRUD Functions in Every Entities. Your help would be appreciated

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• How does an open source project get funded?

  - by squillman

  Other than large entities sponsoring a project, such as the Apache foundation, what are other ways that full-time open source developers (specifically those on products offered free of charge) receive funding for their projects? Obviously there will be donations that will trickle in but from what other channels do developers receive more steady income?

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• How to map a Entity Data Model conceptual model property to a storage model column using the "Serial

  - by codekaizen

  I have a conceptual model in EDM where one of the entities has a property which is essentially a big value object whose properties aren't really useful as columns in the datamodel. I'd like to apply the Serialized LOB pattern to it so that I can fit it into a 192 byte binary column. How do I map this in the EDM v4? Is it even possible at this time? Actually, is it possible in any ORM?

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• Basic Hibernate Caching Question

  - by manyxcxi

  Doe Hibernate use cache (second level or otherwise) if all I am doing is batch inserts? No entities are being requested from the database, and no generators are used. Also, would StatelessSession vs Session change the answer? What if I was using a Session with a JDBC batch size of 50? The cache I will be using is Ehcache

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• Tables as relations in ER diagrams

  - by Richard Mar.

  Assume I have the following tables (**bold** - primary key, *italics* - foreign key): patient(**patient_id**, name) disease(**disease_id**, name) patient_disease(**p_d_id**, *patient_id*, *disease,_id* ) I want to draw the ER diagram for this. My idea is to make two entities, one for patient and one for disease, then make a n-to-n relation between them, with p_d_id as its attribute. Is that how it's supposed to be?

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• Using GQL to check if BlobProperty is NULL

  - by Joel

  Hello, I have a db.BlobProperty property (called "Icon") in my entity which contains an image binary. I want to run a GQL query to retrieve all entities with an image (i.e. their "Icon" property is not NULL). Trying to use the following query: "SELECT * FROM Names WHERE Icon!=NULL" did not work... Trying to use .filter("Icon!=",None) did not work as well... Any ideas? Thanks! Joel

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• LINQ Guid toString()

  - by Sevki

  Hi this seems like it should work, from something in collectionofsomestuff select new SelectListItem(){Text = Name, Value = SomeGuid.ToString(), Selected = false}; When I try to do this it doesn't work give me error LINQ to Entities does not recognize the method 'System.String ToString()' method, and this method cannot be translated into a store expression. Is there a workaround?

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• Triggers in NHibernate

  - by Felipe

  Hi everybody, I'd like to know if is there something like a Trigger (of databases) in NHibernate that I can use per entity ? I'd like to make a history of each record, and with triggers I can compare the old value and new value of each property and generate a register of history. I've heard about Audit in NHibernate, but it's for all entities, if there isn't another way... how Can I separete a block per entity ? Thanks

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• Debug Deserialization on Silverlight Client

  - by Andrew Garrison

  I'm working on a Silverlight client that interacts with a WCF web service. The Silverlight client and the WCF web service are using the same class library for their data entities that they are passing back and forth over the wire. I just added a new entity, and it's not being correctly deserialized on the Silverlight client. My question is, how can I debug the System.ServiceModel.ClientBase as it is deserializing an entity that it received from a WCF web service?

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• weird characters in my generated PDF

  - by gAMBOOKa

  I'm getting ???????? characters in my PDF, i've stripped out \r\n \r \n \t, trimmed everything, decoded html entities and stripped tags. Nothing helps. The data is coming from a MySQL database. Any help would be appreciated.

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• Entity framework unit testing with sqlite

  - by Marcus Malmgren

  Is it possible to unit test Entity Framework v2 repositories with SqLite? Is this only possible if my entities are plain Poco and not automatically generated by Entity Framework? I've generated a entity model from SqlServer and in the generated .edmx file i found this in section SSDL content: Provider="System.Data.SqlClient". Correct me if I am wrong, but shouldnt that be System.Data.SQLite in order to work with sqlite?

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• What is the effect of deleting an entity's ancestor on its path?

  - by Kapil Kaisare

  If I have entities a, b and c such that a is the parent of b and b is the parent of c, will deleting b have any effect on the path of c?

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• When using jQuery's getScript() function I get a "not well-formed" error on a line with comments

  - by codeninja

  My guess is that the src file needs to be XML-friendly, but of course none of the JS file is since it's using all sorts of non-XML compliant entities. getScript() may be expecting an XML file =/ Any thoughts? if(is_def(pObj)){ $.getScript(pObj.src,function(){ pObj.stat = STATUS_OK; $a.dequeue(pObj); }); }

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• How generate the SQL queries that match the JPA Entity CRUD operations at build time with Hibernate

  - by aravisski

  Given JPA annotated Entities, is it possible to generate (i.e. before runtime) the list of queries that will be performed by Hibernate for CRUD operations (performed against EntityManager) ? For named queries it is possible using org.hibernate.hql.QueryTranslator Any pointer into the Hibernate API will be appreciated.

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• Is it possible to use separete ssdl, csdl and msl files for each Entity?

  - by JMSA

  Is it possible to use separete ssdl, csdl and msl files for each Entity in EntityFramework? That is, I want to modularize the mapping information. Note: EdmGen.exe tool stores the ssdl, csdl and msl information in respective files for all entities. Note: If anyone used NHibernate, he should be aware of the fact that, NHibernate uses separate mapping files for each entity. I want to do the same thing.

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• Setting property of objects in datacontext

  - by ryudice

  Hi, all my entities have a common property which specifies the company they belong to, I would like to set this property in a method in my datacontext but I do not want to use the partial methods for each of the entity types that the datacontext provides, is there a method that receives any entity that is inserted throught the datacontext so that I can hook to it or override it and set the property using reflection? thanks.

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• Array of Objects in Core Data Entity?

  - by Abdulla

  I've got two entities, one named exercise and the other named workout. I would like to store several different exercises in each workout object. What is the correct logic here? Create an array of exercises in each workout?

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• How do I use an Entity Framework 4 model without a real database?

  - by Ivan

  I don't need any data to be stored. I'd like an application to start, create an Entity Framework entities container based on the model I've designed but having no data records in it, then generate some data (from user input and other input sources), work with it and discard all the data on close, without propagating any data operations made with EF contect to a real database hosted on server or in a file. How do I implement such a pattern? I use Entity Framework 4 and Visual Studio 2010.

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