Overview  Package   Class  Use  Deprecated  Index
Home >> All >> org >> vrspace >> [ server overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

---

org.vrspace.server
Class DB  

java.lang.Object
  org.vrspace.server.DB

---

public abstract class DB

extends java.lang.Object

Database class

---

Field Summary
org.vrspace.server.db.DBCache	cache           this keeps reference to cache

 

Constructor Summary

DB()

 

Method Summary
abstract  void	commit()           Commit changes.
abstract  void	connect(java.lang.String url)           connect to the database
abstract  java.lang.String	create(java.lang.String name)           create a new database if does not exist
abstract  void	delete(java.lang.Object obj)           From the table obj.getClass().getName() deletes the row having db_id == obj.db_id
abstract  void	disconnect()           Disconnect from the database
abstract  java.lang.Object	get(java.lang.Object obj)           Return database object from table obj.getClass().getName() having db_id = obj.db_id
abstract  java.lang.Object	get(java.lang.String className, long id)           Returns the object having id == obj.db_id
abstract  java.lang.Object	get(java.lang.String className, java.lang.String field, java.lang.Object value)           Returns the object of className class having field == value
abstract  java.lang.Object[]	getAll(java.lang.String className)           Returns all members of the class
abstract  java.lang.Object[]	getRange(java.lang.Object o1, java.lang.Object o2)           Returns Object[] between o1 and o2 Class must have comparator() method to be searchable.
abstract  java.lang.Object[]	getRange(java.lang.String className, java.lang.String field, java.lang.Object value)           Returns the object of className class having field == value
void	load(java.io.File file)           Loads file content into the database
void	load(java.io.Reader in)           Loads stream content into the database
void	load(java.lang.String url)           Loads file content into the db.
abstract  void	put(java.lang.Object obj)           Stores obj into database Logic: - all the public fields are stored - database table: obj.getClass().getName() - create table if does not exist
abstract  void	update(Request r)           A request is a change to one field.

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

cache

public org.vrspace.server.db.DBCache cache

this keeps reference to cache

Constructor Detail

DB

public DB()

Method Detail

create

public abstract java.lang.String create(java.lang.String name)
                                 throws java.lang.Exception

create a new database if does not exist

---

connect

public abstract void connect(java.lang.String url)
                      throws java.lang.Exception

connect to the database

---

disconnect

public abstract void disconnect()

Disconnect from the database

---

commit

public abstract void commit()

Commit changes. Should NOT be synchronized.

---

get

public abstract java.lang.Object get(java.lang.Object obj)
                              throws java.lang.Exception

Return database object from table obj.getClass().getName() having db_id = obj.db_id

---

get

public abstract java.lang.Object get(java.lang.String className,
                                     long id)
                              throws java.lang.Exception

Returns the object having id == obj.db_id

---

get

public abstract java.lang.Object get(java.lang.String className,
                                     java.lang.String field,
                                     java.lang.Object value)
                              throws java.lang.Exception

Returns the object of className class having field == value

---

getRange

public abstract java.lang.Object[] getRange(java.lang.String className,
                                            java.lang.String field,
                                            java.lang.Object value)
                                     throws java.lang.Exception

Returns the object of className class having field == value

---

getRange

public abstract java.lang.Object[] getRange(java.lang.Object o1,
                                            java.lang.Object o2)
                                     throws java.lang.Exception

Returns Object[] between o1 and o2 Class must have comparator() method to be searchable.

---

getAll

public abstract java.lang.Object[] getAll(java.lang.String className)
                                   throws java.lang.Exception

Returns all members of the class

---

delete

public abstract void delete(java.lang.Object obj)
                     throws java.lang.Exception

From the table obj.getClass().getName() deletes the row having db_id == obj.db_id

---

put

public abstract void put(java.lang.Object obj)
                  throws java.lang.Exception

Stores obj into database Logic: - all the public fields are stored - database table: obj.getClass().getName() - create table if does not exist

---

update

public abstract void update(Request r)
                     throws java.lang.Exception

A request is a change to one field. This method allows optimal database update.

---

load

public void load(java.lang.String url)
          throws java.lang.Exception

Loads file content into the db. Default protocol for url is 'file'

---

load

public void load(java.io.Reader in)
          throws java.lang.Exception

Loads stream content into the database

---

load

public void load(java.io.File file)
          throws java.lang.Exception

Loads file content into the database

---

Overview  Package   Class  Use  Deprecated  Index
Home >> All >> org >> vrspace >> [ server overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

---