Database Reference
In-Depth Information
if
(
e
instanceof
SQLException
)
// JDBC-specific exception?
{
// e must be cast from Exception to SQLException to
// access the SQLException-specific methods
printException
((
SQLException
)
e
);
}
}
finally
{
if
(
conn
!=
null
)
{
try
{
conn
.
close
();
System
.
out
.
println
(
"Disconnected"
);
}
catch
(
SQLException
e
)
{
printException
(
e
);
}
}
}
}
public
static
void
tryQuery
(
Connection
conn
)
{
try
{
// issue a simple query
Statement
s
=
conn
.
createStatement
();
s
.
execute
(
"USE cookbook"
);
s
.
close
();
// print any accumulated warnings
SQLWarning
w
=
conn
.
getWarnings
();
while
(
w
!=
null
)
{
System
.
err
.
println
(
"SQLWarning: "
+
w
.
getMessage
());
System
.
err
.
println
(
"SQLState: "
+
w
.
getSQLState
());
System
.
err
.
println
(
"Vendor code: "
+
w
.
getErrorCode
());
w
=
w
.
getNextWarning
();
}
}
catch
(
SQLException
e
)
{
printException
(
e
);
}
}
public
static
void
printException
(
SQLException
e
)
{
// print general message, plus any database-specific message
