建立动态的WML站点(三)

　　接着用户必须在下一个文件（index3.wml）中输入。我们要求用户输入科目的名字或者教授的姓。你要留意一下变量在页面之间是怎样传送的。语法看来有点复杂，不过可以让你了解整个过程是怎样通过几个文件来完成的。
<？php
Header("Content-type: text/vnd.wap.wml");
header("Cache-Control: no-cache, must-revalidate");
header("Pragma: no-cache");
echo ("＜？xml version=1.0？＞;");
＞;
＜!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN"
"＞; ＜WML＞
＜CARD id=card3 title=Name＞
＜？php
echo ("＜p＞Insert ");
if (${$choice} == "surname") {
echo ("professors surname (or part of it).n");
} else if (${$choice} == "subject") {
echo ("the subject (or part of it).n");
} else {
echo ("Maybe there is some problem.n");
} echo ("＜INPUT name="${$choice}" type="text"＞");

？>
＜DO type="text" label="Go"＞
＜GO href="query.wml" method="get"＞
<？php

echo ("＜POSTFIELD value="$"."$choice".""/ name="$choice"＞");

echo ("＜POSTFIELD value="$"."${$choice}".""/ name="${$choice}"＞");

？>
＜/GO＞
＜/DO＞
＜P＞＜/P＞
＜/CARD＞
＜/WML＞



＜DO type="text" label="Go"＞
＜GO href="index3.wml#card3" method="get"＞
<？php
echo ("＜POSTFIELD value="$"."$choice".""/ name="$choice"＞");
echo ("＜POSTFIELD value="$choice"/ name="choice"＞");
？>



＜/CARD＞
＜/WML＞
写查询代码

以下的文件负责处理查询。它的名字是query.wml，我们将更详细地分析它。

<？php

Header("Content-type: text/vnd.wap.wml");
printf("<？xml version="1.0"？>n");
printf("n");
printf("n");


// 以下各行是用来为查询授课时间构造SQL语句的


$consulting_tables =
"(professors left join teach on (professors.Id = teach.Id), subjects)";
$consulting_columns =
$consulting_columns .=
$consulting_query=
"subjects.Cod_Subject = teach.Cod_subject ";


// 以下各行是用来为查询测验时间构造SQL语句的

$exams_tables= "(exams left join professors ON (exams.Id = professors.Id), subjects)";
$exams_columns= "subjects.Subject , subjects.Cod_number, professors.Surname, ";
$exams_columns.= "professors.Name, exams.Date, exams.Time, exams.Room, exams.Test";
$exams_query= "exams.Cod_Subject = subjects.Cod_Subject ";

// 以下各行是用来为查询测验时间表的sql语句增加查询限制


if ($exams_data) {

switch($exams_data) {
case "subject":
$exams_query.= " and subjects.Subject like %$subject%";
break;
case "surname":
$exams_query.= " and professors.Surname like %$surname%";
break;
}
}


// 以下各行是用来为查询授课时间的sql语句增加查询限制

if ($consulting_data) {
switch($consulting_data) {
case "subject":
$consulting_query
.= " and subjects.Subject like %$subject%";
break;
case "surname":
$consulting_query.= " and professors.Surname like %$surname%";
break;
}
}


// 处理与数据库的连接


function connect($tables, $data, $condition_passed) {
//
// put your password and username in next line
//

$db = mysql_pconnect("localhost","***","***");

// put your database name in next line

mysql_select_db("lanfranchi_co_uk",$db);

$sql = "SELECT $data FROM $tables WHERE $condition_passed order by professors.Surname";
$result = mysql_query($sql,$db);
return $result;
}


// 这个函数产生授课时间的wml代码

function consulting_print($consulting_result) {
global $file;
printf("n");
printf(" ＜P＞Receiving hours

n");
while ($myrow = mysql_fetch_row($consulting_result)) {
printf(" ＜P＞$myrow[0], $myrow[1]＜/P＞n");
printf(" ＜P＞$myrow[2]＜/P＞n");
printf(" ＜P＞$myrow[3]＜/P＞n");
printf(" ＜P＞$myrow[4]＜/P＞n");
printf(" ＜P＞$myrow[5]＜/P＞n");
}
printf("＜/CARD＞n");
}


// 这个函数产生测验时间表的wml代码

function print_exams($exams_result) {
global $file;
printf("＜CARD id="card1" title="hours"＞n");
printf(" ＜P＞Examinations hours

n");
while ($myrow = mysql_fetch_row($exams_result)) {
printf(" ＜P＞$myrow[2], $myrow[3]＜/P＞n");
printf(" ＜P＞$myrow[0]＜/P＞n");
printf(" ＜P＞$myrow[1]]＜/P＞n");
printf(" ＜P＞$myrow[4], $myrow[5]＜/P＞n");
printf(" ＜P＞$myrow[7]＜/P＞n");
printf(" ＜P＞$myrow[6]＜/P＞n");
}
printf("＜/CARD＞n");
}


// 检查你时候选择授课时间或者测验时间，连接数据库并且调用产生wml代码的函数

if ($consulting_data) {
$connection_result =
connect($consulting_tables, $consulting_columns, $consulting_query);
consulting_print($connection_result);
}
if ($exams_data) {
$connection_result =
connect($exams_tables, $ exams_columns, $ exams_query);
print_exams($connection_result);
}
printf("＜/WML＞n");

？>

好，完成了。你已经建立了首个基于MySQL数据库的PHP/WML页面了，自己继续实践一下吧。