PHP的数据库操作

第十章

<?php // login.php
$db_hostname = 'localhost';
$db_database = 'publications';
$db_username = 'username';
$db_password = 'password';
?>

<?php
require_once 'login.php';
$db_server = mysql_connect($db_hostname, $db_username, $db_password);
if (!$db_server) die("Unable to connect to MySQL: " . mysql_error());
?>


<?php
mysql_select_db($db_database) or die("Unable to select database: " . mysql_error());
?>

<?php
$query = "SELECT * FROM classics";
$result = mysql_query($query);
if (!$result) die ("Database access failed: " . mysql_error());
?>

<?php
mysql_close($db_server);
?>

<?php
require_once 'login.php';
$db_server = mysql_connect($db_hostname, $db_username, $db_password);
if (!$db_server) die("Unable to connect to MySQL: " . mysql_error());
mysql_select_db($db_database)
    or die("Unable to select database: " . mysql_error());

$query = "DROP TABLE cats";
$result = mysql_query($query);
if (!$result) die ("Database access failed: " . mysql_error());

$query = "INSERT INTO cats VALUES(NULL, 'Lion', 'Leo', 4)";
$result = mysql_query($query);
if (!$result) die ("Database access failed: " . mysql_error());
?>


// ×Ó²éѯ
$query = "SELECT * FROM customers";
$result = mysql_query($query);
if (!$result) die ("Database access failed: " . mysql_error());
$rows = mysql_num_rows($result);

for ($j = 0 ; $j < $rows ; ++$j)
{
    $row = mysql_fetch_row($result);
    echo "$row[0] purchased ISBN $row[1]:<br />";

    $subquery = "SELECT * FROM classics WHERE isbn='$row[1]'";

    $subresult = mysql_query($subquery);
    if (!$subresult) die ("Database access failed: " . mysql_error());
    $subrow = mysql_fetch_row($subresult);
    echo "  '$subrow[1]' by $subrow[0]<br />";
}
?>

<?php
$user  = mysql_fix_string($_POST['user']);
$pass  = mysql_fix_string($_POST['pass']);
$query = "SELECT * FROM users WHERE user='$user' AND pass='$pass'";

function mysql_fix_string($string)
{
    if (get_magic_quotes_gpc()) $string = stripslashes($string);
    return mysql_real_escape_string($string);
}
?>

<?php
require 'login.php';

$db_server = mysql_connect($db_hostname, $db_username, $db_password);
if (!$db_server) die("Unable to connect to MySQL: " . mysql_error());
mysql_select_db($db_database)
    or die("Unable to select database: " . mysql_error());

$query = 'PREPARE statement FROM "INSERT INTO classics
    VALUES(?,?,?,?,?)"';
mysql_query($query);

$query = 'SET @author = "Emily Brontë",' .
         '@title = "Wuthering Heights",' .
         '@category = "Classic Fiction",' .
         '@year = "1847",' .
         '@isbn = "9780553212587"';
mysql_query($query);

$query = 'EXECUTE statement USING @author,@title,@category,@year,@isbn';
mysql_query($query);

$query = 'DEALLOCATE PREPARE statement';
mysql_query($query);
?>

第十章