建立動態的WML站點(三)

接著用戶必須在下一個文件（index3.wml）中輸入。我們要求用戶輸入科目的名字或者教授的姓。你要留意一下變量在頁面之間是怎樣傳送的。語法看來有點復雜，不過可以讓你了解整個過程是怎樣通過幾個文件來完成的。
<？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"
"http://www.wapforum.org/DTD/wml_1.1.xml" ＞; ＜WML＞
＜CARD id=card3 title=Name＞
＜？php;;
echo ("＜p＞Insert ");;;
if (${$choice} == "surname") {;;
echo ("professor"s 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＞
寫查詢代碼

以下的文件負責處理查詢。它的名字是query.wml，我們將更詳細地分析它。

<？php;;

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


// 以下各行是用來為查詢授課時間構造SQL語句的;;


$consulting_tables =;;
"(professors left join teach on (professors.Id = teach.Id), subjects)";;;
$consulting_columns =;;
"professors.Surname, professors.Name, subjects.Subject , ";;;
$consulting_columns .=;;
"subjects.Cod_number, professors.Consulting_hour, professors.Consulting_place";;;
$consulting_query=;;
"subjects.Cod_Subject = teach.Cod_subject ";;;


// 以下各行是用來為查詢測驗時間構造SQL語句的;;

$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 ";;;

// 以下各行是用來為查詢測驗時間表的sql語句增加查詢限制


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;;;
};;
};;


// 以下各行是用來為查詢授課時間的sql語句增加查詢限制

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;;;
};;
};;


// 處理與數據庫的連接;;


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;;;
};;


// 這個函數產生授課時間的wml代碼

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");;;
};;


// 這個函數產生測驗時間表的wml代碼

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");;;
};;


// 檢查你時候選擇授課時間或者測驗時間，連接數據庫并且調用產生wml代碼的函數

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。你已經建立了首個基于MySQL數據庫的PHP/WML頁面了，自己繼續實踐一下吧。;