mirror of git://gcc.gnu.org/git/gcc.git
347 lines
9.9 KiB
Java
347 lines
9.9 KiB
Java
/* DriverManager.java -- Manage JDBC drivers
|
|
Copyright (C) 1999, 2000, 2001, 2003, 2004 Free Software Foundation, Inc.
|
|
|
|
This file is part of GNU Classpath.
|
|
|
|
GNU Classpath is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
GNU Classpath is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GNU Classpath; see the file COPYING. If not, write to the
|
|
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA.
|
|
|
|
Linking this library statically or dynamically with other modules is
|
|
making a combined work based on this library. Thus, the terms and
|
|
conditions of the GNU General Public License cover the whole
|
|
combination.
|
|
|
|
As a special exception, the copyright holders of this library give you
|
|
permission to link this library with independent modules to produce an
|
|
executable, regardless of the license terms of these independent
|
|
modules, and to copy and distribute the resulting executable under
|
|
terms of your choice, provided that you also meet, for each linked
|
|
independent module, the terms and conditions of the license of that
|
|
module. An independent module is a module which is not derived from
|
|
or based on this library. If you modify this library, you may extend
|
|
this exception to your version of the library, but you are not
|
|
obligated to do so. If you do not wish to do so, delete this
|
|
exception statement from your version. */
|
|
|
|
package java.sql;
|
|
|
|
import java.io.PrintStream;
|
|
import java.io.PrintWriter;
|
|
import java.util.Enumeration;
|
|
import java.util.Properties;
|
|
import java.util.StringTokenizer;
|
|
import java.util.Vector;
|
|
|
|
/**
|
|
* This class manages the JDBC drivers in the system. It maintains a
|
|
* registry of drivers and locates the appropriate driver to handle a
|
|
* JDBC database URL.
|
|
* <p>
|
|
* On startup, <code>DriverManager</code> loads all the managers specified
|
|
* by the system property <code>jdbc.drivers</code>. The value of this
|
|
* property should be a colon separated list of fully qualified driver
|
|
* class names. Additional drivers can be loaded at any time by
|
|
* simply loading the driver class with <code>class.forName(String)</code>.
|
|
* The driver should automatically register itself in a static
|
|
* initializer.
|
|
* <p>
|
|
* The methods in this class are all <code>static</code>. This class
|
|
* cannot be instantiated.
|
|
*
|
|
* @author Aaron M. Renn (arenn@urbanophile.com)
|
|
*/
|
|
public class DriverManager
|
|
{
|
|
/**
|
|
* This is the log stream for JDBC drivers.
|
|
*/
|
|
private static PrintStream log_stream;
|
|
|
|
/**
|
|
* This is the log writer for JDBC drivers.
|
|
*/
|
|
private static PrintWriter log_writer;
|
|
|
|
/**
|
|
* This is the login timeout used by JDBC drivers.
|
|
*/
|
|
private static int login_timeout;
|
|
|
|
/**
|
|
* This is the list of JDBC drivers that are loaded.
|
|
*/
|
|
private static Vector drivers;
|
|
// Hmm, seems like we might want to do a Hashtable and lookup by something,
|
|
// but what would it be?
|
|
|
|
// Load all drivers on startup
|
|
static
|
|
{
|
|
drivers = new Vector();
|
|
|
|
String driver_string = System.getProperty("jdbc.drivers");
|
|
if (driver_string != null)
|
|
{
|
|
StringTokenizer st = new StringTokenizer(driver_string);
|
|
while (st.hasMoreTokens())
|
|
{
|
|
String driver_classname = st.nextToken();
|
|
|
|
try
|
|
{
|
|
Class.forName(driver_classname); // The driver registers itself
|
|
}
|
|
catch (Exception e)
|
|
{
|
|
// Ignore not founds
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/** Can't be instantiated. */
|
|
private DriverManager()
|
|
{
|
|
}
|
|
|
|
/**
|
|
* This method returns the log writer being used by all JDBC drivers.
|
|
* This method should be used in place of the deprecated
|
|
* <code>getLogStream</code> method.
|
|
*
|
|
* @return The log writer in use by JDBC drivers.
|
|
*/
|
|
public static PrintWriter getLogWriter()
|
|
{
|
|
return log_writer;
|
|
}
|
|
|
|
/**
|
|
* This method sets the log writer being used by JDBC drivers. This is a
|
|
* system-wide parameter that affects all drivers. Note that since there
|
|
* is no way to retrieve a <code>PrintStream</code> from a
|
|
* <code>PrintWriter</code>, this method cannot set the log stream in
|
|
* use by JDBC. Thus any older drivers may not see this setting.
|
|
*
|
|
* @param out The new log writer for JDBC.
|
|
*/
|
|
public static void setLogWriter(PrintWriter out)
|
|
{
|
|
DriverManager.log_writer = out;
|
|
}
|
|
|
|
/**
|
|
* This method attempts to return a connection to the specified
|
|
* JDBC URL string using the specified connection properties.
|
|
*
|
|
* @param url The JDBC URL string to connect to.
|
|
* @param properties The connection properties.
|
|
*
|
|
* @return A <code>Connection</code> to that URL.
|
|
*
|
|
* @exception SQLException If an error occurs.
|
|
*/
|
|
public static Connection getConnection(String url, Properties properties)
|
|
throws SQLException
|
|
{
|
|
Driver d = getDriver(url);
|
|
if (d == null)
|
|
throw new SQLException("Driver not found for URL: " + url);
|
|
|
|
return d.connect(url, properties);
|
|
}
|
|
|
|
|
|
/**
|
|
* This method attempts to return a connection to the specified
|
|
* JDBC URL string using the specified username and password.
|
|
*
|
|
* @param url The JDBC URL string to connect to.
|
|
* @param user The username to connect with.
|
|
* @param password The password to connect with.
|
|
* @return A <code>Connection</code> to that URL.
|
|
* @exception SQLException If an error occurs.
|
|
*/
|
|
public static Connection getConnection(String url, String user,
|
|
String password) throws SQLException
|
|
{
|
|
Properties p = new Properties();
|
|
|
|
if (user != null)
|
|
p.setProperty("user", user);
|
|
if (password != null)
|
|
p.setProperty("password", password);
|
|
|
|
return getConnection(url, p);
|
|
}
|
|
|
|
/**
|
|
* This method attempts to return a connection to the specified
|
|
* JDBC URL string.
|
|
*
|
|
* @param url The JDBC URL string to connect to.
|
|
*
|
|
* @return A <code>Connection</code> to that URL.
|
|
*
|
|
* @exception SQLException If an error occurs.
|
|
*/
|
|
public static Connection getConnection(String url) throws SQLException
|
|
{
|
|
return getConnection(url, new Properties());
|
|
}
|
|
|
|
/**
|
|
* This method returns a driver that can connect to the specified
|
|
* JDBC URL string. This will be selected from among drivers loaded
|
|
* at initialization time and those drivers manually loaded by the
|
|
* same class loader as the caller.
|
|
*
|
|
* @param url The JDBC URL string to find a driver for.
|
|
*
|
|
* @return A <code>Driver</code> that can connect to the specified
|
|
* URL.
|
|
*
|
|
* @exception SQLException If an error occurs, or no suitable driver can be found.
|
|
*/
|
|
public static Driver getDriver(String url) throws SQLException
|
|
{
|
|
// FIXME: Limit driver search to the appropriate subset of loaded drivers.
|
|
Enumeration e = drivers.elements();
|
|
while(e.hasMoreElements())
|
|
{
|
|
Driver d = (Driver)e.nextElement();
|
|
if (d.acceptsURL(url))
|
|
return d;
|
|
}
|
|
|
|
throw new SQLException("No driver found for " + url);
|
|
}
|
|
|
|
/**
|
|
* This method registers a new driver with the manager. This is normally
|
|
* called by the driver itself in a static initializer.
|
|
*
|
|
* @param driver The new <code>Driver</code> to add.
|
|
*
|
|
* @exception SQLException If an error occurs.
|
|
*/
|
|
public static void registerDriver(Driver driver) throws SQLException
|
|
{
|
|
if (! drivers.contains(driver))
|
|
drivers.addElement(driver);
|
|
}
|
|
|
|
/**
|
|
* This method de-registers a driver from the manager.
|
|
*
|
|
* @param driver The <code>Driver</code> to unregister.
|
|
*
|
|
* @exception SQLException If an error occurs.
|
|
*/
|
|
public static void deregisterDriver(Driver driver) throws SQLException
|
|
{
|
|
if (drivers.contains(driver))
|
|
drivers.removeElement(driver);
|
|
}
|
|
|
|
/**
|
|
* This method returns a list of all the currently registered JDBC drivers
|
|
* that were loaded by the current <code>ClassLoader</code>.
|
|
*
|
|
* @return An <code>Enumeration</code> of all currently loaded JDBC drivers.
|
|
*/
|
|
public static Enumeration getDrivers()
|
|
{
|
|
Vector v = new Vector();
|
|
Enumeration e = drivers.elements();
|
|
|
|
// Is this right?
|
|
ClassLoader cl = Thread.currentThread().getContextClassLoader();
|
|
|
|
while(e.hasMoreElements())
|
|
{
|
|
Object obj = e.nextElement();
|
|
|
|
ClassLoader loader = obj.getClass().getClassLoader();
|
|
|
|
if (loader == null)
|
|
loader = ClassLoader.getSystemClassLoader();
|
|
if (! loader.equals(cl))
|
|
continue;
|
|
|
|
v.addElement(obj);
|
|
}
|
|
|
|
return v.elements();
|
|
}
|
|
|
|
/**
|
|
* This method set the login timeout used by JDBC drivers. This is a
|
|
* system-wide parameter that applies to all drivers.
|
|
*
|
|
* @param login_timeout The new login timeout value.
|
|
*/
|
|
public static void setLoginTimeout(int seconds)
|
|
{
|
|
DriverManager.login_timeout = login_timeout;
|
|
}
|
|
|
|
/**
|
|
* This method returns the login timeout in use by JDBC drivers systemwide.
|
|
*
|
|
* @return The login timeout.
|
|
*/
|
|
public static int getLoginTimeout()
|
|
{
|
|
return login_timeout;
|
|
}
|
|
|
|
/**
|
|
* This method sets the log stream in use by JDBC.
|
|
*
|
|
* @param log_stream The log stream in use by JDBC.
|
|
*
|
|
* @deprecated Use <code>setLogWriter</code> instead.
|
|
*/
|
|
public static void setLogStream(PrintStream out)
|
|
{
|
|
DriverManager.log_stream = log_stream;
|
|
}
|
|
|
|
/**
|
|
* This method returns the log stream in use by JDBC.
|
|
*
|
|
* @return The log stream in use by JDBC.
|
|
*
|
|
* @deprecated Use <code>getLogWriter()</code> instead.
|
|
*/
|
|
public static PrintStream getLogStream()
|
|
{
|
|
return log_stream;
|
|
}
|
|
|
|
/**
|
|
* This method prints the specified line to the log stream.
|
|
*
|
|
* @param str The string to write to the log stream.
|
|
*/
|
|
public static void println(String message)
|
|
{
|
|
if (log_stream != null) // Watch for user not using logging
|
|
log_stream.println(message);
|
|
}
|
|
}
|