DriverManager JDK 1.6)

Description

public class DriverManager

The basic service for managing a set of JDBC drivers.
NOTE: The DataSource interface, new in the JDBC 2.0 API, provides another way to connect to a data source.

The basic service for managing a set of JDBC drivers.
NOTE: The DataSource interface, new in the JDBC 2.0 API, provides another way to connect to a data source. The use of a DataSource object is the preferred means of connecting to a data source.

As part of its initialization, the DriverManager 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:

 jdbc.drivers=foo.bah.Driver:wombat.sql.Driver:bad.taste.ourDriver

The DriverManager methods getConnection and getDrivers have been enhanced to support the Java Standard Edition Service Provider mechanism. JDBC 4.0 Drivers must include the file META-INF/services/java.sql.Driver. This file contains the name of the JDBC drivers implementation of java.sql.Driver. For example, to load the my.sql.Driver class, the META-INF/services/java.sql.Driver file would contain the entry:

 my.sql.Driver

Applications no longer need to explictly load JDBC drivers using Class.forName(). Existing programs which currently load JDBC drivers using Class.forName() will continue to work without modification.

When the method getConnection is called, the DriverManager 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.

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 permission java.sql.SQLPermission "setLog".

See also: Driver Connection

Methods

Hide/Show inherited methods

publicstaticsynchronized void deregisterDriver (Driver driver) throws SQLException

Drops a driver from the DriverManager's list.

Drops a driver from the DriverManager's list.
Applets can only deregister drivers from their own classloaders.
Parameters:
- driver - the JDBC Driver to drop
Throws:
- SQLException - if a database access error occurs

publicstatic Connection getConnection (String url) throws SQLException

Attempts to establish a connection to the given database URL.

publicstatic Connection getConnection (String url, Properties info) throws SQLException

Attempts to establish a connection to the given database URL.

Attempts to establish a connection to the given database URL.
The DriverManager attempts to select an appropriate driver from
the set of registered JDBC drivers.
Returns: a Connection to the URL
Parameters:
- url - a database url of the form jdbc:subprotocol:subname
- info - a list of arbitrary string tag/value pairs as connection arguments; normally at least a "user" and "password" property should be included
Throws:
- SQLException - if a database access error occurs

publicstatic Connection getConnection (String url, String user, String password) throws SQLException

Attempts to establish a connection to the given database URL.

Attempts to establish a connection to the given database URL.
The DriverManager attempts to select an appropriate driver from
the set of registered JDBC drivers.
Returns: a connection to the URL
Parameters:
- url - a database url of the form jdbc:subprotocol:subname
- user - the database user on whose behalf the connection is being made
- password - the user's password
Throws:
- SQLException - if a database access error occurs

publicstatic Driver getDriver (String url) throws SQLException

Attempts to locate a driver that understands the given URL.

Attempts to locate a driver that understands the given URL.
The DriverManager attempts to select an appropriate driver from
the set of registered JDBC drivers.
Returns: a Driver object representing a driver that can connect to the given URL
Parameters:
- url - a database URL of the form jdbc:subprotocol:subname
Throws:
- SQLException - if a database access error occurs

publicstatic Enumeration<Driver> getDrivers ()

Retrieves an Enumeration with all of the currently loaded JDBC drivers to which the current caller has access.

publicstatic int getLoginTimeout ()

Gets the maximum time in seconds that a driver can wait when attempting to log in to a database.

publicstatic PrintStream ~~getLogStream~~ ()

Retrieves the logging/tracing PrintStream that is used by the DriverManager and all drivers.

Retrieves the logging/tracing PrintStream that is used by the DriverManager
and all drivers.
Returns: the logging/tracing PrintStream; if disabled, is null
See Also: DriverManager.setLogStream(java.io.PrintStream),

publicstatic PrintWriter getLogWriter ()

Retrieves the log writer.

Retrieves the log writer.

The getLogWriter and setLogWriter
methods should be used instead
of the get/setlogStream methods, which are deprecated.
Returns: a java.io.PrintWriter object
Since: 1.2
See Also: DriverManager.setLogWriter(java.io.PrintWriter),

pack-privatestatic void initialize ()

publicstatic void println (String message)

Prints a message to the current JDBC log stream.

publicstaticsynchronized void registerDriver (Driver driver) throws SQLException

Registers the given driver with the DriverManager.

Registers the given driver with the DriverManager.
A newly-loaded driver class should call
the method registerDriver to make itself
known to the DriverManager.
Parameters:
- driver - the new JDBC Driver that is to be registered with the DriverManager
Throws:
- SQLException - if a database access error occurs

publicstatic void setLoginTimeout (int seconds)

Sets the maximum time in seconds that a driver will wait while attempting to connect to a database.

publicstatic void ~~setLogStream~~ (PrintStream out)

Sets the logging/tracing PrintStream that is used by the DriverManager and all drivers.

In the Java 2 SDK, Standard Edition, version 1.3 release, this method checks to see that there is an SQLPermission object before setting the logging stream. If a SecurityManager exists and its checkPermission method denies setting the log writer, this method throws a java.lang.SecurityException.
Parameters:
- out - the new logging/tracing PrintStream; to disable, set to null
Throws:
- SecurityException - if a security manager exists and its checkPermission method denies setting the log stream
See Also: SecurityManager.checkPermission(java.security.Permission), DriverManager.getLogStream(),

publicstatic void setLogWriter (PrintWriter out)

Sets the logging/tracing PrintWriter object that is used by the DriverManager and all drivers.

There is a minor versioning problem created by the introduction of the method setLogWriter. The method setLogWriter cannot create a PrintStream object that will be returned by getLogStream---the Java platform does not provide a backward conversion. As a result, a new application that uses setLogWriter and also uses a JDBC 1.0 driver that uses getLogStream will likely not see debugging information written by that driver.

Starting with the Java 2 SDK, Standard Edition, version 1.3 release, this method checks to see that there is an SQLPermission object before setting the logging stream. If a SecurityManager exists and its checkPermission method denies setting the log writer, this method throws a java.lang.SecurityException.
Parameters:
- out - the new logging/tracing PrintStream object; null to disable logging and tracing
Throws:
- SecurityException - if a security manager exists and its checkPermission method denies setting the log writer
Since: 1.2
See Also: SecurityManager.checkPermission(java.security.Permission), DriverManager.getLogWriter(),