java.lang.Object | |
↳ | java.sql.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:
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"
.
Public Methods | |||||||||||
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Drops a driver from the
DriverManager 's list. | |||||||||||
Attempts to establish a connection to the given database URL.
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Attempts to establish a connection to the given database URL.
| |||||||||||
Attempts to establish a connection to the given database URL.
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Attempts to locate a driver that understands the given URL.
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Retrieves an Enumeration with all of the currently loaded JDBC drivers
to which the current caller has access.
| |||||||||||
Retrieves the logging/tracing PrintStream that is used by the
DriverManager
and all drivers.@deprecated | |||||||||||
Retrieves the log writer.
| |||||||||||
Gets the maximum time in seconds that a driver can wait
when attempting to log in to a database.
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Prints a message to the current JDBC log stream.
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Registers the given driver with the
DriverManager . | |||||||||||
Sets the logging/tracing PrintStream that is used
by the
DriverManager
and all drivers. | |||||||||||
Sets the logging/tracing
PrintWriter object
that is used by the DriverManager and all drivers. | |||||||||||
Sets the maximum time in seconds that a driver will wait
while attempting to connect to a database.
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[Expand]
Inherited Methods | |||||||||||
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From class
java.lang.Object
|
Drops a driver from the DriverManager
's list.
Applets can only deregister drivers from their own classloaders.
driver | the JDBC Driver to drop |
---|
SQLException | if a database access error occurs |
---|
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.
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 |
SQLException | if a database access error occurs |
---|
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.
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 |
SQLException | if a database access error occurs |
---|
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.
url | a database url of the form
jdbc:subprotocol:subname |
---|
SQLException | if a database access error occurs |
---|
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.
url | a database URL of the form
jdbc:subprotocol:subname |
---|
Driver
object representing a driver
that can connect to the given URLSQLException | if a database access error occurs |
---|
Retrieves an Enumeration with all of the currently loaded JDBC drivers to which the current caller has access.
Note: The classname of a driver can be found using
d.getClass().getName()
Retrieves the logging/tracing PrintStream that is used by the DriverManager
and all drivers.@deprecated
null
Retrieves the log writer.
The getLogWriter
and setLogWriter
methods should be used instead
of the get/setlogStream
methods, which are deprecated.
java.io.PrintWriter
objectGets the maximum time in seconds that a driver can wait when attempting to log in to a database.
Prints a message to the current JDBC log stream.
message | a log or tracing message |
---|
Registers the given driver with the DriverManager
.
A newly-loaded driver class should call
the method registerDriver
to make itself
known to the DriverManager
.
driver | the new JDBC Driver that is to be registered with the
DriverManager |
---|
SQLException | if a database access error occurs |
---|
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
.@deprecated
out | the new logging/tracing PrintStream; to disable, set to null |
---|
SecurityException | if a security manager exists and its
checkPermission method denies setting the log stream |
---|
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
.
out | the new logging/tracing PrintStream object;
null to disable logging and tracing |
---|
SecurityException | if a security manager exists and its
checkPermission method denies
setting the log writer |
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Sets the maximum time in seconds that a driver will wait while attempting to connect to a database.
seconds | the login time limit in seconds; zero means there is no limit |
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