mapping
Wifi Triangulation
You can’t use the GPS technique because the timing is nothing like accurate enough. The best you can do is Trilateration based on the signal strength from each base station and assume that range is proportional to signal. You will probably need to force a connection to each base station in turn in order to … Read more
Navigation Property without Declaring Foreign Key
I believe, it is not possible to define the relationship only with data attributes. The problem is that EF’s mapping conventions assume that Creator and Modifier are the two ends of one and the same relationship but cannot determine what the principal and what the dependent of this association is. As far as I can … Read more
How do you map a “Map” in hibernate using annotations?
You could simply use the JPA annotation @MapKey (note that the JPA annotation is different from the Hibernate one, the Hibernate @MapKey maps a database column holding the map key, while the JPA’s annotation maps the property to be used as the map’s key). @javax.persistence.OneToMany(cascade = CascadeType.ALL) @javax.persistence.MapKey(name = “name”) private Map<String, Person> nameToPerson = … Read more
JPA Map mapping
Although answer given by Subhendu Mahanta is correct. But @CollectionOfElements is deprecated. You can use @ElementCollection instead: @ElementCollection @JoinTable(name=”ATTRIBUTE_VALUE_RANGE”, joinColumns=@JoinColumn(name=”ID”)) @MapKeyColumn (name=”RANGE_ID”) @Column(name=”VALUE”) private Map<String, String> attributeValueRange = new HashMap<String, String>(); There is no need to create a separate Entity class for the Map field. It will be done automatically.
How to change the path of a mapped drive in win7?
If you want to use the command line have a look to the next answer below! But you can also edit the settings in Windows Registry: ‘HKEY_CURRENT_USER\Network\[Drive letter]‘ When you now open a new ‘My Computer‘ window – after changing the target in registry – you will likely see the old settings, but that is … Read more
Fluent NHibernate, working with interfaces
I find that there are valid reasons for using an interface instead of a concrete class as a property. For example, if your Field class was in a seperate project to the Address class, and you didn’t have a dependency on the Address class’s project from the Field class’s project. There are other ways of … Read more
How can I access iteration index in Ramda.map
Check out addIndex: Creates a new list iteration function from an existing one by adding two new parameters to its callback function: the current index, and the entire list. This would turn, for instance, Ramda’s simple map function into one that more closely resembles Array.prototype.map. Note that this will only work for functions in which … Read more
Entity Framework 4.1 InverseProperty Attribute and ForeignKey
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