public class JOptionPaneTest3 {
public static void main(String[] args) {
JDialog.setDefaultLookAndFeelDecorated(true);
Object[] selectionValues = { “Pandas”, “Dogs”, “Horses” };
String initialSelection = “Dogs”;
Object selection = JOptionPane.showInputDialog(null, “What are your favorite animals?”,
“Zoo Quiz”, JOptionPane.QUESTION_MESSAGE, null, selectionValues, initialSelection);
System.out.println(selection);
}
}

public class JOptionPaneTest2 {
public static void main(String[] args) {
//… Text to put on the buttons.
String[] choices = {“Democratic”, “Republican”, “None of your business”, “Quit”};

//… Variables to keep track of the counts.
int democraticCount = 0;
int republicanCount = 0;
int noAnswerCount = 0;

//… “Infinite” loop, terminated by call to System.exit(0)
while (true) {
int response = JOptionPane.showOptionDialog(
null // Center in window.
, “How did you vote?” // Message
, “Party Poll” // Title in titlebar
, JOptionPane.YES_NO_OPTION // Option type
, JOptionPane.PLAIN_MESSAGE // messageType
, null // Icon (none)
, choices // Button text as above.
, “None of your business” // Default button’s label
);

//… Use a switch statement to check which button was clicked.
switch (response) {
case 0:
democraticCount++;
break;
case 1:
republicanCount++;
break;
case 2:
noAnswerCount++;
break;
case 3:
case -1:
//… Both the quit button (3) and the close box(-1) handled here.
System.exit(0); // It would be better to exit loop, but…
default:
//… If we get here, something is wrong. Defensive programming.
JOptionPane.showMessageDialog(null, “Unexpected response ” + response);
}

//… Display the accumulated results so far.
JOptionPane.showMessageDialog(null, “Response = ” + response
+ “\nDem = ” + democraticCount
+ “\nRep = ” + republicanCount
+ “\nOther = ” + noAnswerCount);
}
}
}

The DELETE FROM statement is used to delete records from a database table.

Syntax

<

DELETE FROM table_name
WHERE column_name = some_value

Note: SQL statements are not case sensitive. DELETE FROM is the same as delete from.To get PHP to execute the statement above we must use the mysql_query() function. This function is used to send a query or command to a MySQL connection.

Example

Earlier in the tutorial we created a table named “Person”. Here is how it looks:

The following example deletes all the records in the “Person” table where LastName=’Griffin’:

<?php
$con = mysql_connect("localhost","peter","abc123");
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }

mysql_select_db("my_db", $con);

mysql_query("DELETE FROM Person WHERE LastName='Griffin'");

mysql_close($con);
?>

After the deletion, the table will look like this:

The UPDATE statement is used to modify data in a database table.

Syntax

UPDATE table_name
SET column_name = new_value
WHERE column_name = some_value

Note: SQL statements are not case sensitive. UPDATE is the same as update.To get PHP to execute the statement above we must use the mysql_query() function. This function is used to send a query or command to a MySQL connection.

Example

Earlier in the tutorial we created a table named “Person”. Here is how it looks:

The following example updates some data in the “Person” table:

<?php
$con = mysql_connect("localhost","peter","abc123");
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }

mysql_select_db("my_db", $con);

mysql_query("UPDATE Person SET Age = '36'
WHERE FirstName = 'Peter' AND LastName = 'Griffin'");

mysql_close($con);
?>

After the update, the “Person” table will look like this: