/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/**
* <P>The basic service for managing a set of JDBC drivers.<br>
* <B>NOTE:</B> The {@link <code>DataSource</code>} interface, new in the
* JDBC 2.0 API, provides another way to connect to a data source.
* The use of a <code>DataSource</code> object is the preferred means of
* connecting to a data source.
*
* <P>As part of its initialization, the <code>DriverManager</code> class will
* attempt to load the driver classes referenced in the "jdbc.drivers"
* system property. This allows a user to customize the JDBC Drivers
* used by their applications. For example in your
* ~/.hotjava/properties file you might specify:
* <pre>
* <CODE>jdbc.drivers=foo.bah.Driver:wombat.sql.Driver:bad.taste.ourDriver</CODE>
* </pre>
*<P> The <code>DriverManager</code> methods <code>getConnection</code> and
* <code>getDrivers</code> have been enhanced to support the Java Standard Edition
* <a href="../../../technotes/guides/jar/jar.html#Service%20Provider">Service Provider</a> mechanism. JDBC 4.0 Drivers must
* include the file <code>META-INF/services/java.sql.Driver</code>. This file contains the name of the JDBC drivers
* implementation of <code>java.sql.Driver</code>. For example, to load the <code>my.sql.Driver</code> class,
* the <code>META-INF/services/java.sql.Driver</code> file would contain the entry:
* <pre>
* <code>my.sql.Driver</code>
* </pre>
*
* <P>Applications no longer need to explictly load JDBC drivers using <code>Class.forName()</code>. Existing programs
* which currently load JDBC drivers using <code>Class.forName()</code> will continue to work without
* modification.
*
* <P>When the method <code>getConnection</code> is called,
* the <code>DriverManager</code> will attempt to
* locate a suitable driver from amongst those loaded at
* initialization and those loaded explicitly using the same classloader
* as the current applet or application.
*
* <P>
* Starting with the Java 2 SDK, Standard Edition, version 1.3, a
* logging stream can be set only if the proper
* permission has been granted. Normally this will be done with
* the tool PolicyTool, which can be used to grant <code>permission
* java.sql.SQLPermission "setLog"</code>.
* @see Driver
* @see Connection
*/
public class DriverManager {
// List of registered JDBC drivers
private final static CopyOnWriteArrayList<DriverInfo> registeredDrivers = new CopyOnWriteArrayList<DriverInfo>();
// Used in println() to synchronize logWriter
/* Prevent the DriverManager class from being instantiated. */
private DriverManager(){}
/**
* Load the initial JDBC drivers by checking the System property
* jdbc.properties and then use the {@code ServiceLoader} mechanism
*/
static {
println("JDBC DriverManager initialized");
}
/**
* The <code>SQLPermission</code> constant that allows the
* setting of the logging stream.
* @since 1.3
*/
new SQLPermission("setLog");
//--------------------------JDBC 2.0-----------------------------
/**
* Retrieves the log writer.
*
* The <code>getLogWriter</code> and <code>setLogWriter</code>
* methods should be used instead
* of the <code>get/setlogStream</code> methods, which are deprecated.
* @return a <code>java.io.PrintWriter</code> object
* @see #setLogWriter
* @since 1.2
*/
return logWriter;
}
/**
* that is used by the <code>DriverManager</code> and all drivers.
* <P>
* There is a minor versioning problem created by the introduction
* of the method <code>setLogWriter</code>. The
* method <code>setLogWriter</code> cannot create a <code>PrintStream</code> object
* that will be returned by <code>getLogStream</code>---the Java platform does
* not provide a backward conversion. As a result, a new application
* that uses <code>setLogWriter</code> and also uses a JDBC 1.0 driver that uses
* <code>getLogStream</code> will likely not see debugging information written
* by that driver.
*<P>
* Starting with the Java 2 SDK, Standard Edition, version 1.3 release, this method checks
* to see that there is an <code>SQLPermission</code> object before setting
* the logging stream. If a <code>SecurityManager</code> exists and its
* <code>checkPermission</code> method denies setting the log writer, this
* method throws a <code>java.lang.SecurityException</code>.
*
* <code>null</code> to disable logging and tracing
* @throws SecurityException
* if a security manager exists and its
* <code>checkPermission</code> method denies
* setting the log writer
*
* @see SecurityManager#checkPermission
* @see #getLogWriter
* @since 1.2
*/
}
}
//---------------------------------------------------------------
/**
* Attempts to establish a connection to the given database URL.
* The <code>DriverManager</code> attempts to select an appropriate driver from
* the set of registered JDBC drivers.
*
* @param url a database url of the form
* <code> jdbc:<em>subprotocol</em>:<em>subname</em></code>
* connection arguments; normally at least a "user" and
* "password" property should be included
* @return a Connection to the URL
* @exception SQLException if a database access error occurs
*/
}
/**
* Attempts to establish a connection to the given database URL.
* The <code>DriverManager</code> attempts to select an appropriate driver from
* the set of registered JDBC drivers.
*
* @param url a database url of the form
* <code>jdbc:<em>subprotocol</em>:<em>subname</em></code>
* @param user the database user on whose behalf the connection is being
* made
* @param password the user's password
* @return a connection to the URL
* @exception SQLException if a database access error occurs
*/
}
}
}
/**
* Attempts to establish a connection to the given database URL.
* The <code>DriverManager</code> attempts to select an appropriate driver from
* the set of registered JDBC drivers.
*
* @param url a database url of the form
* <code> jdbc:<em>subprotocol</em>:<em>subname</em></code>
* @return a connection to the URL
* @exception SQLException if a database access error occurs
*/
throws SQLException {
}
/**
* Attempts to locate a driver that understands the given URL.
* The <code>DriverManager</code> attempts to select an appropriate driver from
* the set of registered JDBC drivers.
*
* @param url a database URL of the form
* <code>jdbc:<em>subprotocol</em>:<em>subname</em></code>
* @return a <code>Driver</code> object representing a driver
* that can connect to the given URL
* @exception SQLException if a database access error occurs
*/
throws SQLException {
// Walk through the loaded registeredDrivers attempting to locate someone
// who understands the given URL.
// If the caller does not have permission to load the driver then
// skip it.
try {
// Success!
}
} catch(SQLException sqe) {
// Drop through and try the next driver.
}
} else {
}
}
println("getDriver: no suitable driver");
}
/**
* Registers the given driver with the <code>DriverManager</code>.
* A newly-loaded driver class should call
* the method <code>registerDriver</code> to make itself
* known to the <code>DriverManager</code>.
*
* @param driver the new JDBC Driver that is to be registered with the
* <code>DriverManager</code>
* @exception SQLException if a database access error occurs
*/
throws SQLException {
/* Register the driver if it has not already been added to our list */
} else {
// This is for compatibility with the original DriverManager
throw new NullPointerException();
}
}
/**
* Drops a driver from the <code>DriverManager</code>'s list.
* Applets can only deregister drivers from their own classloaders.
*
* @param driver the JDBC Driver to drop
* @exception SQLException if a database access error occurs
*/
throws SQLException {
return;
}
} else {
// If the caller does not have permission to load the driver then
// throw a SecurityException.
throw new SecurityException();
}
} else {
println(" couldn't find driver to unload");
}
}
/**
* Retrieves an Enumeration with all of the currently loaded JDBC drivers
* to which the current caller has access.
*
* <P><B>Note:</B> The classname of a driver can be found using
* <CODE>d.getClass().getName()</CODE>
*
* @return the list of JDBC Drivers loaded by the caller's class loader
*/
// Walk through the loaded registeredDrivers.
// If the caller does not have permission to load the driver then
// skip it.
} else {
}
}
}
/**
* Sets the maximum time in seconds that a driver will wait
* while attempting to connect to a database.
*
* @param seconds the login time limit in seconds; zero means there is no limit
* @see #getLoginTimeout
*/
}
/**
* Gets the maximum time in seconds that a driver can wait
* when attempting to log in to a database.
*
* @return the driver login time limit in seconds
* @see #setLoginTimeout
*/
public static int getLoginTimeout() {
return (loginTimeout);
}
/**
* by the <code>DriverManager</code>
* and all drivers.
*<P>
* In the Java 2 SDK, Standard Edition, version 1.3 release, this method checks
* to see that there is an <code>SQLPermission</code> object before setting
* the logging stream. If a <code>SecurityManager</code> exists and its
* <code>checkPermission</code> method denies setting the log writer, this
* method throws a <code>java.lang.SecurityException</code>.
*
* @deprecated
* @throws SecurityException if a security manager exists and its
* <code>checkPermission</code> method denies setting the log stream
*
* @see SecurityManager#checkPermission
* @see #getLogStream
*/
}
else
}
/**
* and all drivers.
*
* @deprecated
* @see #setLogStream
*/
return logStream;
}
/**
* Prints a message to the current JDBC log stream.
*
* @param message a log or tracing message
*/
synchronized (logSync) {
// automatic flushing is never enabled, so we must do it ourselves
}
}
}
//------------------------------------------------------------------------
// Indicates whether the class object that would be created if the code calling
// DriverManager is accessible.
}
boolean result = false;
try {
result = false;
}
}
return result;
}
private static void loadInitialDrivers() {
try {
}
});
}
// If the driver is packaged as a Service Provider, load it.
// Get all the drivers through the classloader
// exposed as a java.sql.Driver.class service.
// ServiceLoader.load() replaces the sun.misc.Providers()
/* Load these drivers, so that they can be instantiated.
* It may be the case that the driver class may not be there
* i.e. there may be a packaged driver with the service class
* as implementation of java.sql.Driver but the actual class
* may be missing. In that case a java.util.ServiceConfigurationError
* will be thrown at runtime by the VM trying to locate
* and load the service.
*
* Adding a try catch block to catch those runtime errors
* if driver not available in classpath but it's
* packaged as service and that service is there in classpath.
*/
try{
while(driversIterator.hasNext()) {
}
} catch(Throwable t) {
// Do nothing
}
return null;
}
});
return;
}
try {
}
}
}
// Worker method called by the public getConnection() methods.
/*
* When callerCl is null, we should check the application's
* (which is invoking this class indirectly)
* classloader, so that the JDBC driver class outside rt.jar
* can be loaded from here.
*/
synchronized (DriverManager.class) {
// synchronize loading of the correct classloader.
}
}
}
// Walk through the loaded registeredDrivers attempting to make a connection.
// Remember the first exception that gets raised so we can reraise it.
// If the caller does not have permission to load the driver then
// skip it.
try {
// Success!
return (con);
}
} catch (SQLException ex) {
}
}
} else {
}
}
// if we got here nobody could connect.
throw reason;
}
}
}
/*
* Wrapper class for registered Drivers in order to not expose Driver.equals()
* to avoid the capture of the Driver it being compared to as it might not
* normally have access.
*/
class DriverInfo {
}
return (other instanceof DriverInfo)
}
public int hashCode() {
}
}
}