PHP新手上路（十一）数据库链接

/* action=view : retrieve data from the database and show it to the user */
if($action == "view") {

/* function for showing the data */
function search_it($name) {

/* some vars */
global $offset,$total,$lpp,$dir;
global $table,$html_mail,$admin_name,$admin_mail;

/* select the data to get out of the database */
$query = "SELECT name, email, job, comments FROM $table";
$result = mysql_query($query);
$total= mysql_numrows($result);

print "

if ($total== 0) {
print "

elseif ($total> 0) {

/* default */
$counter=0;
if ($dir=="") $dir="Next";
$lpp=5;
if ($offset==0) $offset=0;

if ($dir=="Next") {

if ($total > $lpp) {

$counter=$offset;
$offset =$lpp;
$num=$offset;

if ($num > $total) {
$num=$total; } }

else {
$num=$total; } }

elseif ($dir=="Previous") {

if ($total > $lpp) {
$offset-=$lpp;

if ($offset <0) {
$offset=0; }

$counter=$offset-$lpp;

if ($counter <0)
$counter=0;
$num=$counter $lpp; }

else {
$num=$total; } }

while ($counter <$num) {
$j=0;
$j=$counter 1;

/* now really grab the data */
$i1=mysql_result($result,$counter,"name");
$i2=mysql_result($result,$counter,"email");
$i3=mysql_result($result,$counter,"job");
$i4=mysql_result($result,$counter,"comments");

$i4 = stripslashes ("$i4");

/* print it in a nice layout */
print "

/* execute the function */
search_it($name);

/* See if we need to put on the NEXT or PREVIOUS buttons */
if ($total > $lpp) {
echo("n");

/* See if we need a PREVIOUS button */
if ($offset > $lpp) {
echo("n"); }

/* See if we need a NEXT button */
if ($offset <$total) {
echo("n"); }

echo("n");
echo("n");
echo("");
}
}

/* action=add : show a form where the user can enter data to add to the database */
elseif($action == "add") { ?>

}

/* action=send : add the data from the user into the database */
elseif($action == "send") {

/* check if a HTML-mail should be send or a plain/text mail */
if($html_mail == "yes") {
mail("$admin_name <$admin_mail>","PHP3 Guestbook Addition","

/* MySQL really hates it when you try to put things with ' or " characters into a database, so strip these...*/
$comments = addslashes ("$comments");
$query = "INSERT INTO guestbook VALUES('','$name', '$email', '$job', '$comments')";
$result = MYSQL_QUERY($query);

?>

感谢, , 您的留言.

观看留言

}

/* if there's no action given, then we must show the main page */
else {

/* get the number of entries written into the guestbook*/
$query = "SELECT name from guestbook";
$result = MYSQL_QUERY($query);
$number = MYSQL_NUMROWS($result);

if ($number == "") {
$entry = "还没有人留过言"; }

elseif ($number == "1") {
$entry = "目前留言人数1人"; }

else {
$entry = "目前留言人数 $number 人"; }

echo "