Error 3034 Entity Framework
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Entity Framework Error 3002 Problem In Mapping Fragments
hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join entity framework error 26 - error locating server/instance specified the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Error 3034 occurs in entity framework error 3007 problem in mapping fragments EF 5.0 when using TPT inheritance and many to many relationship up vote 0 down vote favorite I have 3 step inheritance abstract Entity abstract ApplicationEntity:Entity abstract SystemEntity:ApplicationEntity the system entity contains a many to many navigation property which when I try to load I get (202,10) : error 3034: Problem in mapping fragments starting at lines 202, 208:Two entities with different keys are mapped to
Entity Framework Error 11007 Entity Type Is Not Mapped
the same row. Ensure these two mapping fragments do not map two groups of entities with different keys to the same group of rows. (208,10) : error 3034: Problem in mapping fragments starting at lines 208, 578:Two entities with different keys are mapped to the same row. Ensure these two mapping fragments do not map two groups of entities with different keys to the same group of rows. please help me entity-framework inheritance many-to-many entity-framework-5 share|improve this question asked Apr 22 '13 at 15:54 R.ZareianFard 114 are you doing code first? –hubson bropa May 6 '13 at 21:39 add a comment| 1 Answer 1 active oldest votes up vote 0 down vote I'm going to post a solution here, but this may not fit your problem as this is for code first approach. Solution was actually pretty simple. Just dress the base and derived classes with a unique table name, EF will represent each class as a separate table. In practice (using VB but you get the point if C#): the base class Imports System.ComponentModel.DataAnnotations.Schema Namespace Models
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Entity Framework Error 2062
other. Join them; it only takes a minute: Sign up Entity Framework Issue Mapping - two mapping fragments up vote 2 down vote favorite I am using .net 4 and entity framework 4.x I have 3 tables in http://stackoverflow.com/questions/16151365/error-3034-occurs-in-ef-5-0-when-using-tpt-inheritance-and-many-to-many-relation sql server. For instance Persons, PersonClasses and Classes Persons has pk PersonId Classes has pk ClassId PersonClasses has PersonId fk and ClassId fk After adding to my EDMX i get the following error. How to resolve? Error 3034: Problem in mapping fragments starting at lines 691, 768:Two entities with possibly different keys are mapped to the same row. Ensure these two mapping fragments map both ends of the AssociationSet to the corresponding columns. entity-framework share|improve this question asked http://stackoverflow.com/questions/11005757/entity-framework-issue-mapping-two-mapping-fragments Jun 12 '12 at 22:25 David 1,20742655 add a comment| 1 Answer 1 active oldest votes up vote 3 down vote accepted The only solution I found to this problem was to remove all entities from the model and update the model from database fresh. This worked for me. Potentially something not working so well in the designer after you remove a few tables and replace only those few tables. Not sure at this point. share|improve this answer answered Jun 13 '12 at 11:20 David 1,20742655 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up using Email and Password Post as a guest Name Email Post as a guest Name Email discard By posting your answer, you agree to the privacy policy and terms of service. Not the answer you're looking for? Browse other questions tagged entity-framework or ask your own question. asked 4 years ago viewed 2179 times active 2 years ago Related 645Entity Framework vs LINQ to SQL4Error 3023 using Entity Framework40Entity framework - “Problem in mapping fragments”-error. Help me understand the explanations of this error0Problems with char(4) FK, entity framework57Entity Framework 4 mapping fragment error when adding new entity scalar5Entity Framework table per hierarchy error 30347Problem in mapping fragments in Entity Framework3Entity Framework Add Mapping to View0Entity Framework Conditional Mapping293No Entit
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that meet the needs of our applications. Another way of putting this is that we are able to create application-centric views of our data stores. This conceptual layer may look similar or drastically different from how the underlying data is stored. Further, we can add in application concepts such as inheritance. A table-per-type model is a way to model inheritance where each entity is mapped to a distinct table in the store. Each table contains all of the properties for the entity, as well as a key that maps ultimately to the root table / entity. View the Screencast You can watch the channel9 screencast here! The Data Model It’s probably best to take a look at a sample data model that we can model a table-per-type hierarchy from. The motivation for building a data model such as this should be pretty clear. Essentially it comes down to protecting data. Suppose that we have business rules that state that every Student have a degree defined. We would like to set this column as non-nullable. However, if Students were stored in a generic People table along with Admins and Instructors, this would not be possible. This is because the degree column would have to be nullable because Admins and Instructors do not have degrees (in the case of this example). By storing the Student, Admin, Instructor and BusinessStudent information in their own tables, we are able to use nullability to enforce certain business rules. As you might imagine (from the name), we will be developing a conceptual layer that has an entity that maps back to each table in the above screenshot. We will also be modeling an inheritance hierarchy. In this case, we will have a base entity of Person. We will have 2 entities that inherit from person: Student, Admin and Instructor. We will then have a BusinessStudent entity that inherits from Student. Implementing Table Per Type Inheritance Step 1: Add the Entity Data Model Step 2: Generate the Model From The Data