edu.mssm.crover.db.relational
Class RDB

java.lang.Object
  |
  +--edu.mssm.crover.db.relational.RDB

public class RDB

extends java.lang.Object

Relational Database access point. This class is a singleton.

Field Summary

static boolean

DEBUG

Method Summary

void	destroy() Deactivates connections to the database.
java.sql.Connection	getConnection() Obtain a connection from the pool.
int	getConnectionNumber() Returns the current number of open connections.
static RDB	getInstance() Returns the only instance of RDB available in the system (one per JVM, or zone when used in JServ).
static RDB	getInstance(java.lang.String dburl, java.lang.String login, java.lang.String password, java.lang.String driver) Returns the only instance of RDB available in the system (one per JVM, or zone when used in JServ).
Log	getLog() Returns the log system.
void	log(int level, java.lang.String message) Log a message and an exception.
void	log(int level, java.lang.String message, java.lang.Exception e) Logs a message and an exception.
static void	main(java.lang.String[] args) Tests and demonstrates this class behaviour.
void	returnConnection(java.sql.Connection con) Returns a connection to the pool.

Methods inherited from class java.lang.Object

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

Field Detail

DEBUG

public static boolean DEBUG

Method Detail

getConnectionNumber

public int getConnectionNumber()

Returns the current number of open connections. Connections can be open but inactive. This method is useful to test that a given client frees all connections it uses.

getConnection

public java.sql.Connection getConnection()
                                  throws java.sql.SQLException

Obtain a connection from the pool.

java.sql.SQLException

returnConnection

public void returnConnection(java.sql.Connection con)

Returns a connection to the pool.

getInstance

public static RDB getInstance()

Returns the only instance of RDB available in the system (one per JVM, or zone when used in JServ).

getInstance

public static RDB getInstance(java.lang.String dburl,
                              java.lang.String login,
                              java.lang.String password,
                              java.lang.String driver)

Returns the only instance of RDB available in the system (one per JVM, or zone when used in JServ).

log

public void log(int level,
                java.lang.String message,
                java.lang.Exception e)

Logs a message and an exception.

See Also:

Log

log

public void log(int level,
                java.lang.String message)

Log a message and an exception.

See Also:

Log

getLog

public Log getLog()

Returns the log system.

destroy

public void destroy()

Deactivates connections to the database.

main

public static void main(java.lang.String[] args)

Tests and demonstrates this class behaviour.