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Java Source Code / Java Documentation » Database ORM » db ojb » org.odmg 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


org.odmg.Database

All known Subclasses:   org.apache.ojb.odmg.DatabaseImpl,
Database
public interface Database (Code)
The interface for interacting with an ODMG database. Databases must be opened before starting any transactions that use the database and closed after ending these transactions.

A database application generally begins processing by accessing one or more critical objects and proceeding from there. These objects are root objects, because they lead to interconnected webs of other objects. The ability to name an object (using method bind) and retrieve it later by that name (using method lookup facilitates this start-up capability. A name is not explicitly defined as an attribute of an object. Naming an object also makes it persistent.

There is a single flat name scope per database; thus all names in a particular database are unique.
author:
   David Jordan (as Java Editor of the Object Data Management Group)
version:
   ODMG 3.0



Field Summary
final public static  intNOT_OPEN
     The database is not open.
final public static  intOPEN_EXCLUSIVE
     The database is open for exclusive access.
final public static  intOPEN_READ_ONLY
     The database is opened for read-only access.
final public static  intOPEN_READ_WRITE
     The database is opened for reading and writing.


Method Summary
public  voidbind(Object object, String name)
     Associate a name with an object and make it persistent.
public  voidclose()
     Close the database.
public  voiddeletePersistent(Object object)
     Deletes an object from the database.
public  Objectlookup(String name)
     Lookup an object via its name.
Parameters:
  name - The name of an object.
public  voidmakePersistent(Object object)
     Make a transient object durable in the database.
public  voidopen(String name, int accessMode)
     Open the named database with the specified access mode.
public  voidunbind(String name)
    

Field Detail
NOT_OPEN
final public static int NOT_OPEN(Code)
The database is not open.



OPEN_EXCLUSIVE
final public static int OPEN_EXCLUSIVE(Code)
The database is open for exclusive access.



OPEN_READ_ONLY
final public static int OPEN_READ_ONLY(Code)
The database is opened for read-only access.



OPEN_READ_WRITE
final public static int OPEN_READ_WRITE(Code)
The database is opened for reading and writing.





Method Detail
bind
public void bind(Object object, String name) throws ObjectNameNotUniqueException(Code)
Associate a name with an object and make it persistent. An object instance may be bound to more than one name. Binding a previously transient object to a name makes that object persistent.
Parameters:
  object - The object to be named.
Parameters:
  name - The name to be given to the object.
exception:
  org.odmg.ObjectNameNotUniqueException - If an attempt is made to bind a name to an object and that name is already boundto an object.



close
public void close() throws ODMGException(Code)
Close the database. After you have closed a database, further attempts to access objects in the database will cause the exception DatabaseClosedException to be thrown. Some implementations may throw additional exceptions that are also derived from ODMGException.
exception:
  ODMGException - Unable to close the database.



deletePersistent
public void deletePersistent(Object object)(Code)
Deletes an object from the database. It must be executed in the context of an open transaction. If the object is not persistent, then ObjectNotPersistent is thrown. If the transaction in which this method is executed commits, then the object is removed from the database. If the transaction aborts, then the deletePersistent operation is considered not to have been executed, and the target object is again in the database.
Parameters:
  object - The object to delete.



lookup
public Object lookup(String name) throws ObjectNameNotFoundException(Code)
Lookup an object via its name.
Parameters:
  name - The name of an object. The object with that name.
exception:
  ObjectNameNotFoundException - There is no object with the specified name.
See Also:   ObjectNameNotFoundException



makePersistent
public void makePersistent(Object object)(Code)
Make a transient object durable in the database. It must be executed in the context of an open transaction. If the transaction in which this method is executed commits, then the object is made durable. If the transaction aborts, then the makePersistent operation is considered not to have been executed, and the target object is again transient. ClassNotPersistenceCapableException is thrown if the implementation cannot make the object persistent because of the type of the object.
Parameters:
  object - The object to make persistent.



open
public void open(String name, int accessMode) throws ODMGException(Code)
Open the named database with the specified access mode. Attempts to open a database when it has already been opened will result in the throwing of the exception DatabaseOpenException. A DatabaseNotFoundException is thrown if the database does not exist. Some implementations may throw additional exceptions that are also derived from ODMGException.
Parameters:
  name - The name of the database.
Parameters:
  accessMode - The access mode, which should be one of the static fields:OPEN_READ_ONLY, OPEN_READ_WRITE,or OPEN_EXCLUSIVE.
exception:
  ODMGException - The database could not be opened.



unbind
public void unbind(String name) throws ObjectNameNotFoundException(Code)
Disassociate a name with an object
Parameters:
  name - The name of an object.
exception:
  ObjectNameNotFoundException - No object exists in the database with that name.



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