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To access the information, you call one of the fetch functions in a while or other loop to extract each row of information from the query For example:

while(my $row = $sth->fetchrow_hashref())

The fetchrow_hashref method is probably the most practical, as it returns the row in the form of a hash reference, with each key being the name of a returned column, and the corresponding value being the value of the field For example, to extract the date and time:

Answer (for Objective 55):

$date = $row->{date}; $time = $row->{time};

Other methods include fetchrow_array, which returns an array of fields in the order they were specified in the select statement, and fetchrow_arrayref, which returns a reference to an array on the same basis Once you ve read all of the rows, you must call finish on the select object ($sth in the examples above) to complete the sequence

The Win32::ODBC module supports the same basic sequence, although you don t have to explicitly create a handler to operate the query and extraction process:

abstract class Nameable { String name; } class Animal extends Nameable { Animal(String n) { name = n; } String getName() { return name; } } public class Buddies extends Animal { Buddies(String s) { super(s); } public static void main(String[] args) { Animal b1 = new Animal("Kara"); Buddies b2 = new Buddies("Charis"); Systemoutprintln(b1getName() + " " + b2getName()); } }

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$db->Sql("SELECT Acronym,Expansion from Acronyms"); while($db->FetchRow()) { ($acronym,$expansion) = $db->Data(); print "$acronym: $expansion\n"; }

The FetchRow method gets a single row as returned by the query it s the Data method that actually extracts and returns the information from the row By default, it returns an array of the fields in the order they were specified in the SELECT statement You can also extract individual fields by name:

$db->Sql("SELECT * from Acronyms"); while($db->FetchRow()) { ($expansion, $acronym) = $db->Data('Expansion', 'Acronym'); print "$acronym: $expansion\n"; }

Or, you can return the information as a hash and then access the fields directly:

39 Given:

$db->Sql("SELECT * from Acronyms"); while($db->FetchRow()) { %row = $db->DataHash(); print "$row{Acronym}: $row{Expansion}\n"; }

The result is the same in each case Note, however, that you don t have to explicitly finish the process as you do with DBI

initialized Date() object, and a new date and time is calculated and returned as another Date() object Here s an example:

Once you ve finished using a database, you must formally close the connection from within DBI or Win32::ODBC On some databases, including mySQL and PostGreSQL, failing to formally close the connection causes a rollback, undoing any insertions, updates, or deletions that you ve conducted within that process

1 import javautil*; 2 public class PirateTalk { 3 public static void main(String arrrrgs) { 4 Properties p = SystemgetProperties(); 5 psetProperty("pirate", "scurvy"); 6 String s = pgetProperty("argProp") + " "; 7 s += pgetProperty("pirate"); 8 Systemoutprintln(s); 9 } }

13:

$dbh->disconnect();

and under Win32::ODBC, you use the Close method:

And the command-line invocation:

$sql->Close();

Both modules work on the same basic premise as the rest of Perl a false return value from a function or method call indicates a failure, while a true value indicates success However, to get an error message describing why the process failed, you must use a separate method defined by each module

The errstr method returns the error string reported by the last statement you should use it in combination with the result code from an operation to actually report an error For example:

$result = $dbh->do($query); print $dbh->errstr(),"\n" unless ($result);

java PirateTalk -DargProp="dog,"

You can use the Win32::ODBC::Error function to get the extended error from the ODBC interface:

$db = new Win32::ODBC("Acronym"); if ($db) { # Do some querying } else { die "Couldn't connect to DB:" Win32::ODBC::Error(); }

Although this has been a fairly quick overview of what s possible, you should be able to do 95 percent of the tasks you need to using the information given in this chapter

What is the result A dog, scurvy B null scurvy C scurvy dog, D scurvy null E F Compilation fails An exception is thrown at runtime

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