Database Reference
In-Depth Information
// Connect.java: connect to the MySQL server
import
java.sql.*
;
public
class
Connect
{
public
static
void
main
(
String
[]
args
)
{
Connection
conn
=
null
;
String
url
=
"jdbc:mysql://localhost/cookbook"
;
String
userName
=
"cbuser"
;
String
password
=
"cbpass"
;
try
{
Class
.
forName
(
"com.mysql.jdbc.Driver"
).
newInstance
();
conn
=
DriverManager
.
getConnection
(
url
,
userName
,
password
);
System
.
out
.
println
(
"Connected"
);
}
catch
(
Exception
e
)
{
System
.
err
.
println
(
"Cannot connect to server"
);
System
.
exit
(
1
);
}
if
(
conn
!=
null
)
{
try
{
conn
.
close
();
System
.
out
.
println
(
"Disconnected"
);
}
catch
(
Exception
e
)
{
/* ignore close errors */
}
}
}
}
To try
Connect.java
, locate it under the
api
directory of the
recipes
distribution, com‐
pile it, and execute it. The
class
statement indicates the program's name, which in this
case is
Connect
. The name of the file containing the program must match this name
and include a
.java
extension, so the filename for the program is
Connect.java
. Compile
the program using
javac
:
%
javac Connect.java
If you prefer a different Java compiler, substitute its name for
javac
.
The Java compiler generates compiled byte code to produce a class file named
Con
nect.class
. Use the
java
program to run the class file (specified without the
.class
exten‐
sion). The program should print two lines indicating that it connected and disconnected
successfully:
