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我正在为图书数据库做 Perl 作业。我需要制作和 html 表单，用户将在其中键入输入，例如：

1）标题 2）作者 3）语言 4）年份 5）销售额

然后我需要 CGI 来处理它。并存储到数据库“书籍”中。

我正在使用 MySql 数据库。

我面临的问题是没有输出我输入的值，我尝试了很多方法调试它，但仍然没有结果。

这是我的 html 表单“CreateForm.html”

<form method="post" action="http://localhost:8080/cgi-bin/create.cgi"  >
<table border="1">
<tr>
<td>Title: </td>
<td><input type="text" name="title"></td>
</tr>
<tr>
<td>Author: </td>
<td><input type="text" name="author"></td>
</tr>
<tr>
<td>Language: </td>
<td><input type="text" name="language"></td>
</tr>
<tr>
<td>Year of Publication: </td>
<td><input type="text" name="year"></td>
</tr>
<tr>
<td>Estimated sales: </td>
<td><input type="text" name="sales"></td>
</tr>
<tr>
<td><input type="submit" /></td>
</tr>
</table>
</form>

我在 Windows 上运行 XAMPP

这里基本上是我的代码'create.cgi'

#!"C:\xampp\perl\bin\perl.exe"
print "Content-type: text/html\r\n\r\n";

#include section
use strict;
use DBI;
use CGI;
my $q=new CGI;

#declaration section
my $name;
my $value;
my $sth;
my %FORM;
my $dbh;
my $sql;
my $rv;
my $key;
my $buffer;
my @pairs;
my $pair;
my $title;
my $author;
my $language;
my $year;
my $sales;



if ($ENV{'REQUEST_METHOD'} eq 'POST') {
  read(STDIN, $buffer, $ENV{'CONTENT_LENGTH'});
} else {
  $buffer = $ENV{'QUERY_STRING'};
}
@pairs = split(/&/, $buffer);
foreach $pair (@pairs) {
  ($name, $value) = split(/=/, $pair);
  $name =~ tr/+/ /;
  $name =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
  $value =~ tr/+/ /;
  $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
  $FORM{$name} = $value;
}

#parsing data
$title=$q->param('title');
$author=$q->param('author');
$language=$q->param('language');
$year=$q->param('year');
$sales=$q->param('sales');


#database connectivity
$dbh = DBI->connect('DBI:mysql:books', 'root', ''
               ) || die "Could not connect to database: $DBI::errstr";



#test insert
$sth=$dbh->do('INSERT INTO BOOKS (TITLE,AUTHOR,LANGUAGE,YEAR,SALES) VALUES (
    "Nineteen eight four",
    "George Orwell",
    "English",
    1947,
    25000000)
');


$sql="INSERT INTO BOOKS (TITLE,AUTHOR,LANGUAGE,YEAR,SALES) values ('$title','$author','$language','$year','$sales')";

$sth=$dbh->prepare($sql) or die "can't prepare $sql: $dbh->errstrn";
$rv=$sth->execute;


if ($rv==1){
print "Record has been successfully created !!!<br>";
}else{
print "Error!!while inserting record\n";
exit;
}

$sth = $dbh->prepare("SELECT * FROM BOOKS");
$sth->execute();



foreach $key(sort keys %FORM){
print "<h3>$key: $FORM{$key}</h3>";
}


print "<html>";
print "<head>";
print "<title>Create Form</title>";
print "</head>";
print "<body>";

print "Title: $FORM{'title'}              <br/>";
print "Author: $FORM{'author'}                <br/>";
print "Language: $FORM{'language'}                <br/>";
print "Year: $FORM{'year'}                <br/>";
print "Sales: $FORM{'sales'}                <br/>";


foreach $key(sort keys %FORM){
print "<h3>$key: $FORM{$key}</h3>";
}


#retrieving all tables to check
#while (my $ref = $sth->fetchrow_hashref()) {
#print "<br>Found a row:\n
#          id = $ref->{'BOOKID'}, 
#          tname = $ref->{'TITLE'}, 
#          author: $ref->{AUTHOR}, 
#          language: $ref->{'LANGUAGE'}, 
#          year: $ref->{'YEAR'}, 
#          sales: $ref->{'SALES'} \n";
#}


#while (my $ref = $sth->fetchrow_hashref()) {
#
#          %rec=%{$pRec};
#          print "$rec{'title'}";
#}


print "</body>";
print "</html>";



$sth->finish();
$dbh->disconnect();

线

foreach $key(sort keys %FORM){
print "<h3>$key: $FORM{$key}</h3>";
}

不输出任何东西

我收到的输出

Record has been successfully created !!!
Title:
Author:
Language:
Year:
Sales:

空条目，但已执行 INSERT 操作

30  Nineteen eight four     George Orwell   English     1947    25000000

提前致谢

4

1 回答 1

4

考虑到您在其他地方正确访问参数，我不明白您为什么要搞乱 %FORM 哈希，例如：

$title=$q->param('title');

因此，你为什么不直接输出$title？

print "Title: $title <br/>";

如果你想要一个带有参数的键和值的散列，那么将它放入一个 hashref 中：

$params = $q->Vars;

然后，如果您想遍历该 hashref，请执行以下操作：

foreach my $key ( sort keys %$params ) {
  print "$key has a value of $params->{$key}\n";
}

------------------------ 8< ------------

附录，与问题无关：

您真的不想按照您的方式将您的值放入 SQL 中：

$sql="INSERT INTO BOOKS (TITLE,AUTHOR,LANGUAGE,YEAR,SALES) values ('$title','$author','$language','$year','$sales')";

相反，您想使用占位符并将参数传递给 execute() 方法：

$sql = "INSERT INTO BOOKS (TITLE,AUTHOR,LANGUAGE,YEAR,SALES) values (?,?,?,?,?)";
$sth = $dbh->prepare($sql) or die "can't prepare $sql: $dbh->errstrn";
$sth->execute( $title, $author, $language, $year, $sales );
于 2012-11-17T17:15:48.963 回答