java.lang.Objectjava.sql.DriverManager
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 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:
A program can also explicitly load JDBC drivers at any time. For example, the my.sql.Driver is loaded with the following statement:
my.sql.Driver
Class.forName("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".
Method Summary | |
---|---|
static void |
deregisterDriver
(
Driver
driver) Drops a driver from the DriverManager's list. |
static Connection |
getConnection
(
String
url) Attempts to establish a connection to the given database URL. |
static Connection |
getConnection
(
String
url,
Properties
info) Attempts to establish a connection to the given database URL. |
static Connection |
getConnection
(
String
url,
String
user,
String
password) Attempts to establish a connection to the given database URL. |
static Driver |
getDriver
(
String
url) Attempts to locate a driver that understands the given URL. |
static
Enumeration
![]() ![]() |
getDrivers
() Retrieves an Enumeration with all of the currently loaded JDBC drivers to which the current caller has access. |
static int |
getLoginTimeout
() Gets the maximum time in seconds that a driver can wait when attempting to log in to a database. |
static PrintStream |
getLogStream
() Deprecated. |
static PrintWriter |
getLogWriter
() Retrieves the log writer. |
static void |
println
(
String
message) Prints a message to the current JDBC log stream. |
static void |
registerDriver
(
Driver
driver) Registers the given driver with the DriverManager. |
static void |
setLoginTimeout
(int seconds) Sets the maximum time in seconds that a driver will wait while attempting to connect to a database. |
static void |
setLogStream
(
PrintStream
out) Deprecated. |
static void |
setLogWriter
(
PrintWriter
out) Sets the logging/tracing PrintWriter object that is used by the DriverManager and all drivers. |
Methods inherited from class java.lang. Object |
---|
clone , equals , finalize , getClass , hashCode , notify , notifyAll , toString , wait , wait , wait |
Method Detail |
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public static PrintWriter getLogWriter()
public static void setLogWriter(PrintWriter out)
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
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.
public static Connection getConnection(String url, Properties info) throws SQLException
public static Connection getConnection(String url, String user, String password) throws SQLException
public static Connection getConnection(String url) throws SQLException
public static Driver getDriver(String url) throws SQLException
public static void registerDriver(Driver driver) throws SQLException
public static void deregisterDriver(Driver driver) throws SQLException
public static Enumeration<Driver>getDrivers()
Note: The classname of a driver can be found using d.getClass().getName()
public static void setLoginTimeout(int seconds)
public static int getLoginTimeout()
@Deprecatedpublic static void setLogStream(PrintStream out)
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.
@Deprecatedpublic static PrintStreamgetLogStream()
public static void println(String message)