jointable

I have four entities that I would like to translate into database tables via code first fluent api (I'm using a model found at databaseanswers.org), but I'm not certain as to how. The problem I'm having is that SuggestedMenuId is being migrated across two different tables in a Composite key (MenuCourse and CourseRecipeChoice). Here's the message I'm getting: "One or more validation errors were detected during model generation: \tSystem.Data.Entity.Edm.EdmAssociationConstraint: : The number of properties in the Dependent and Principal Roles in a relationship constraint must be identical." Here

I have spent couple of hours searching around and did not found anything similar to my case. Let's assume following many-to-many data model: Contract (any business entity) - contract_id - other fields Party (another business entity) - party_id - other fields Contract_Party (relations between first two with additional role indicator, e.g. owner, signer, seller, etc) - contract_id - party_id - role Now let's assume I want to map all contracts related to party (uni-directional). It can be done using following annotations in Party entity class: @OneToMany @JoinTable( name="Contract_Party",

How do I setup a join table with extra columns, or a many-to-many association with additional properties, in Doctrine 2? Jasper N. Brouwer First off, let me explain that this does not exist: A join table (also known as a junction table or cross-reference table ) is a table that links 2 (or more) other tables together within the same database by primary key. This means that a join table will only contain foreign keys, there is no place for these extra columns. So when you need extra columns in such a table, it is no longer just a "link" between other tables, but becomes a real table on its own!

I have 4 tables. User table: id col1 col2 CoursesAssigned table: id user_id course_id approved CourseInfo table: id parent_id CourseParents table: id start_date end_date I think the table names and its column names are self explanatory. I have 2 kinds of users - i) assigned ii) unassigned. I show them in 2 different pages. While showing the assigned students I need those students from users table for each of whom there is at least one row in CoursesAssigned table where user_id is his own user id and the approved field is 1 and the course_id in that row has its own parent_id (from CourseInfo )

I have parent/child relationship between two tables, and the corresponding mapping in my Java classes. The tables roughly look like that: A (ref number, stuff varchar2(4000)) B (a_ref number, other number, foo varchar2(200)) and the Java code: @Entity class A { @Id @Column(name = "REF") private int ref; @OneToMany @JoinColumn(name = "A_REF", referencedName = "REF") private Set<B> bs; } @Entity class B { @Id @Column(name = "A_REF") private int aRef; @Id @Column(name = "OTHER") private int other; } This works fine, but I'd like to add a filter on the rows that I retrieve from the child table.