About embedded
Storing JPA Entity Objects
Explains how to use JPA to store (persist) entity objects in the database.... Explicit Persist Referenced Embedded Objects Referenced Entity Objects ... other persistable types can only be stored in the database embedded in containing entities (as field values). A ... See JavaDoc Reference Page... . Referenced Embedded Objects The following code stores an Employee instance ...
JPA Annotations for Fields
Reference (JavaDoc) of JPA 2 field annotations, including @Basic, @Embedded, @EmbeddedId, @Version, @Transient, @Enumerated, @MapKeyEnumerated, @Temporal and @MapKeyTemporal.... javax.persistence.Basic javax.persistence.Embedded javax.persistence.ElementCollection ...
collection of embedded objects
1. In general, are there any restrictions of the use of @Embedded objects in collections, compared to @Entity? 2. If you have a large nested collection of @Embedded objects, and you remove the parent @Entity, does the remove cascade through the whole collection? 3. Is searching through collections of @Embedded objects more expensive (time) than searching through collections of @Entity? ... 1. In general, are there any restrictions of the use of @Embedded objects in collections, compared to @Entity ? 2. If you have a large nested collection of @Embedded objects, and you remove the parent @Entity , does the remove ...
Embedable & Reference?
Hi! I've got a situation I do not understand. Assume code like this: ... assigning this.thing = thing they are actually different embedded objects after retrieving from the db? Does this also mean that referencing an already embedded object will save it twice in the db? If so, how can I achieve ...
config file for embedded database
Hi, I'm going back to embedded mode after some time with client/server mode. Question: how does the embedded jar find it's config file? Dave ps: thanks for the improvements to the explorer - still need a way to view (view only) an open embedded database. ... Hi, I'm going back to embedded mode after some time with client/server mode. Question: how does the embedded jar find it's config file? Dave ps: thanks for the ...
Possible issue with Spring JPA and Embedded
Hello, ... Hello, I'm having some fun with Spring and embedded objects. I have need to embed some small objects inside another ... how to go about proving where the issue is. (I can see the embedded objects in the database with the explorer, but they are NEVER ...
Embedded & Activation & Scalation
Hi there, Our app is highly scalable and can be distributed among multiple processes on multiple machines. ObjectDB Server is not really scalable right now and would be a SPOF for our application. So, we'd like to embedded odb into each instance instead for now and point each to the same database folder, however I've got a few questions I couldn't find answers for: ... would be a SPOF for our application. So, we'd like to embedded odb into each instance instead for now and point each to the same ... ACID, poor query ability, etc.). You cannot use embedded mode that way. In embedded mode only a single process can access the ...
config file for embedded database
Hi, I'm going back to embedded mode after some time with client/server mode. Question: how does the embedded jar find it's config file? Dave ps: thanks for the improvements to the explorer - still need a way to view (view only) an open embedded database. ... Hi, I'm going back to embedded mode after some time with client/server mode. Question: how does the embedded jar find it's config file? Dave ps: thanks for the ...
Password in Embedded Mode?
Is there a way to setup a database file that will be accessed in embedded mode, such that it is locked with a password. Thereby making it impossible to use ObjectDB to access the contents of the file without providing the correct password when obtaining a connection. In my case, I'm interested in obtaining a JPA connection:... a way to setup a database file that will be accessed in embedded mode, such that it is locked with a password. Thereby making it ... name) only in client-server mode. It seems that in embedded mode password protection would be useful only with database ...
javax.persistence.AttributeOverride
Used to override the mapping of a Basic (whether explicit or default) property or field or Id property or field.(Annotation of JPA)
