You don’t. This is a very common question. Entities should only know about other entities and not about the entity manager or other high level services. It can be a bit of a challenge to make the transition to this way of developing but it’s usually worth it. What you want to do is to … Read more
You can put this inside your entityFramework section of the app.config: <contexts> <context type=”YourNamespace.YourDbContext, YourAssemblyName” disableDatabaseInitialization=”true”/> </contexts> This msdn page tells all about the Entity Framework Configuration Section.
This behavior is correct, otherwise if you change object one and object two with different values you will have problems when persisting them. What is happening is the call to load object two updates the entity loaded in the first call. They must point to the same object since they ARE the same object. This … Read more
in Linq to Entity, you should use the methods in your query which is supported by your provider to convert them to expression tree to run on your Data Base side. all providers must support some methods by default called Canonical Functions (Read More Here), and also you can define your user defined function and … Read more
You can use a plugin like Eclipse Dali to do the trick for you. You can refer to the documentation, section 3.11 Generating Entities from Tables. I do not know of any specific vendor independent tool to do this, though.
Not sure you can do it exactly as you want but you can use inheritance to produce the same result. AbsT has all the fields but no @Table annotation Ta and Tb inherit from AbsT and have an @Table annotation each Use @Inheritance(strategy=InheritanceType.TABLE_PER_CLASS) in AbsT. Sample code: @Entity @Inheritance(strategy=InheritanceType.TABLE_PER_CLASS) public class abstract AbsT { @Id … Read more
No you cannot do that in mapping. Typical workaround is simple extension method: public static IQueryable<Car> BuildCar(this IQueryable<Car> query) { return query.Include(x => x.Wheels) .Include(x => x.Doors) .Include(x => x.Engine) .Include(x => x.Bumper) .Include(x => x.Windows); } Now every time you want to query Car with all relations you will just do: var query = … Read more
You could use Apache Commons Beanutils. Here’s a simple example: package at.percom.temp.zztests; import java.lang.reflect.InvocationTargetException; import org.apache.commons.beanutils.BeanMap; import org.apache.commons.beanutils.PropertyUtilsBean; import java.util.Arrays; import java.util.HashSet; import java.util.Objects; import java.util.Set; public class Main { public static void main(String[] args) throws IllegalAccessException, InvocationTargetException, NoSuchMethodException { Main main = new Main(); main.start(); } public void start() throws IllegalAccessException, InvocationTargetException, NoSuchMethodException { … Read more
I was getting this error and tried a few of the earlier suggestions. Then I checked the Inner Exception and noticed I was getting a simple SQL login failure for the user. Just something else to check.
It is theoretically correct but SQL server (not Entity framework) doesn’t like it because your model allows single employee to be a member of both First and Second team. If the Team is deleted this will cause multiple delete paths to the same Employee entity. This cannot be used together with cascade deletes which are … Read more