Java Reference
In-Depth Information
To connect to a data source and obtain a
Connection
instance, call one of
DriverManager
's
Connection getConnection(String url)
,
Connec-
tion getConnection(String url, Properties info)
, or
Connec-
tion getConnection(String url, String user, String pass-
word)
methods. Witheither method, the
url
argument specifies astring-based URL
that starts with the
jdbc:
prefix and continues with data source-specific syntax.
ConsiderJavaDB.TheURLsyntaxvariesdependingonthedriver.Fortheembedded
driver (when you want to access a local database), this syntax is as follows:
jdbc:derby:
databaseName
;
URLAttributes
For the client driver (when youwant to access a remote database, although youcan
also access a local database with this driver), this syntax is as follows:
jdbc:derby://
host
:
port
/
databaseName
;
URLAttributes
With either syntax,
URLAttributes
isanoptional sequence ofsemicolon-delim-
ited
name
=
value
pairs. Forexample,
create=true
tells Java DBtocreate anew
database.
ThefollowingexampledemonstratesthefirstsyntaxbytellingJDBCtoloadtheJava
DB embedded driver and create the database named
testdb
on the local host:
Connection con = DriverMan-
ager.getConnection("jdbc:derby:testdb;create=true");
Thefollowing example demonstrates thesecondsyntaxbytelling JDBCtoloadthe
JavaDBclientdriverandcreatethedatabasenamed
testdb
onport
8500
ofthe
xyz
host:
Connection con;
con = DriverManager.getConnection("jdbc:derby://xyz:8500/
testdb;create=true");
Note
Forconvenience,thischapter'sapplicationsuseonlytheembeddeddrivercon-
nection syntax.
Exceptions
DriverManager
's
getConnection()
methods (and other JDBC methods in the
variousJDBCinterfaces)throw
java.sql.SQLException
oroneofitssubclasses
when something goes wrong. Along with the methods it inherits from
java.lang.Throwable
(e.g.,
String getMessage()
),
SQLException
de-
clares various constructors (not discussed for brevity) and the following methods:
