如何从 mysql DB 中搜索与 mojolicious perl 中选定的下拉列表相关的内容
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【中文标题】如何从 mysql DB 中搜索与 mojolicious perl 中选定的下拉列表相关的内容【英文标题】：How to search from mysql DB with related to selected drop down list in mojolicious perl 【发布时间】：2020-12-03 22:43:05 【问题描述】：我将学生订购的信息数据存储在数据库中。我想通过从日期和时间选择的下拉列表来搜索这些订单。通常，我可以搜索数据库中的所有数据，但当我选择下拉列表从日期和时间选项时无法工作。
我的文件在下面：
SrchList.html.ep
<%
my $SrchResult = stash('SrchResult');
my $Date = stash('Date');
my @Date =(['--' => '']);
foreach my $key (sort keys %$Date)
push(@Date, ($Date->$key->name) => $key);
my $Time = stash('Time');
my @Time =(['--' => '']);
for(my $i = 1; $i <= $Time->max; $i++)
push(@Time, [$i.'H' => $i]);
%>
<form action="<%= url_for('/SrchList') %>" method="post" class="form-horizontal frmSrchList">
<div class="row">
<div class="col-lg-10 col-lg-offset-1">
<div class="input-group">Order Start<%= select_field 'Date'=>\@Date, class=>'form-control', id=>'Date_start' %></div>
<div class="input-group">Time Start<%= select_field 'Time'=>\@Time, class=>'form-control', id=>'Time_start' %></div>
<div> ~ </div>
<div class="input-group">Order End<%= select_field 'Date'=>\@Date, class=>'form-control', id=>'Date_end' %></div>
<div class="input-group">Time End<%= select_field 'Time'=>\@Time, class=>'form-control', id=>'Time_end' %></div>
</div>
<div class="col-lg-10 col-lg-offset-1">
<button type="submit" class="btn btn-success">Search</button>
</div>
</div>
<div class="row"><table class="table table-striped">
<thead><tr><th>recptid</th><th>student_id</th><th>price</th><th>total</th><th>upd_date</th></tr></thead>
<tbody >
% foreach my $reserve_id (sort $b <=> $a keys %$SrchResult)
% $SrchResult->$reserve_id->upd_date =~ /(\d4)\-(\d2)\-(\d2) (\d2):(\d2):(\d2)/;
% $SrchResult->$reserve_id->price =~ s/\,/<br>/g;
<tr>
<td><%= uc($SrchResult->$reserve_id->recptid) %></td>
<td><%= uc($SrchResult->$reserve_id->student_id) %></td>
<td align="right"> <%== decode('utf-8', $SrchResult->$reserve_id->price) %> </td>
<td align="center"> <%== decode('utf-8', $SrchResult->$reserve_id->total) %></td>
<td> <%= decode('utf-8', $SrchResult->$reserve_id->upd_date) %> </td>
</tr>%
</tbody>
</table></div>
</form>
index.cgi
get '/SrchList'=>page => undef => sub
my $self = shift;
my @breadcrumb = ('SrchList');
$self->stash('breadcrumb'=> \@breadcrumb);
my $Date = $TextBookCommon->GetDate();
$self->stash('Date' => $Date);
$self->stash('Time' => $TextBookCommon->'CONFIG'->'SELECT'->'Time');
$session->clear('_SRCH_DATA');
$self->render('SrchList');
;
post '/SrchList/:page' => page => undef => sub
my $self = shift;
my @breadcrumb = ('SrchList');
$self->stash('breadcrumb'=> \@breadcrumb);
my %SRCH_DATA = (defined $session->param('_SRCH_DATA') ? %$session->param('_SRCH_DATA') : '');
my $Date;
my $Time;
if(! defined $self->param('return'))
$Date = ($self->param('Date') ne '' ? $self->param('Date') : $Date);
$Time = ($self->param('Time') ne '' ? $self->param('Time') : $Time);
else
$Date = (exists($SRCH_DATA'Date') ? $SRCH_DATA'Date' : '');
$Time = (exists($SRCH_DATA'Time') ? $SRCH_DATA'Time' : '');
my $SrchData =
'Date' => $Date,
'Time' => $Time
;
my $DateData = $TextBookCommon->GetDate();
$session->param(-name=>'_SRCH_DATA', -value=>$SrchData);
my $SrchResult = $TextBookCommon->GetOrderSearch($SrchData);
$self->stash('Date' => $DateData);
$self->stash('Time' => $TextBookCommon->'CONFIG'->'SELECT'->'Time');
$self->stash('SrchResult'=> $SrchResult);
$self->stash('SrchData'=> $SrchData);
$self->stash('TextBookCommon' => $TextBookCommon);
$self->render('SrchList');
;
index.cgi.conf
'SELECT' =>
'Time' =>
'max' => 24
,
,
TextBookCommon.pm
sub CreateOrderSearchSQL()
my $self = shift;
my $StudentData = shift;
my $Date_start = $StudentData->Date_start;
my $Time_start = $StudentData->Time_start;
my $Date_end = $StudentData->Date_end;
my $Time_end = $StudentData->Time_end;
my $sql;
my $dbh = $self->'dbh';
my $data = '';
my @param = ();
$sql =<<" SQL_EOL";
SELECT tr.reserve_id, tr.recptid, tr.student_id, GROUP_CONCAT(tr.price) AS 'price',
SUM(tr.price)+1000 AS 'total', tr.upd_date AS 'upd_date'
FROM
( SELECT ra.reserve_id, RIGHT(ra.reserve_id,5) AS recptid,
m.student_id, rb.price, rb.upd_date FROM t_reserve_a AS ra
INNER JOIN t_reserve_b AS rb ON ra.reserve_id=rb.reserve_id
INNER JOIN m_student AS m ON m.student_id=ra.student_id ) AS tr
GROUP BY tr.reserve_id
SQL_EOL
if($Date_start ne '' || $Date_end ne '')
$sql .="and WHERE DATE(t_reserve_a.upd_date) BETWEEN DATE(t_reserve_a.upd_date) = ? AND DATE(t_reserve_a.upd_date) =?";
push(@param, $Date_start, $Date_end);
if($Time_start ne '' || $Time_end ne '')
$sql .="and WHERE TIME(t_reserve_a.upd_date) BETWEEN TIME(t_reserve_a.upd_date) = ? AND TIME(t_reserve_a.upd_date) = ? ";
push(@param, $Date_start, $Date_end);
my $result =
'sql' => $sql,
'param' => \@param,
;
return $result;
sub GetOrderSearch()
my $self = shift;
my $StudentData = shift;
my $result = $self->CreateOrderSearchSQL($StudentData);
my $sql = $result->'sql';
my @param = @$result->'param';
$sql .= " order by tr.reserve_id ";
my $SrchResult = $dbh->selectall_hashref($sql,'reserve_id',undef, @param);
return $SrchResult;
谁能帮我解决这个问题？
【问题讨论】：
【参考方案1】：您的 SQL 看起来有问题。您将在GROUP BY 之后附加WHERE 子句。这是一个 SQL 语法错误。本质上，您正在生成这样的 SQL：
SELECT * FROM foo GROUP BY id AND WHERE bar = 1;
这将引发类似于
的错误SQL 错误 (1064)：您的 SQL 语法有错误；检查与您的 mysql 服务器版本相对应的手册，以在第 1 行的“WHERE bar = 1”附近使用正确的语法
我们看不到您的 $dbh 是在哪里创建的，但我假设您没有启用错误检查。您的$dbh 甚至在GetOrderSearch 中也不可用。您在构建 SQL 并且从不使用它的另一种方法中将其从 $self 中取出，但不是在您实际运行查询的地方，因此您的代码可能根本无法编译。
在任何情况下，您都应该重新安排 SQL 代码的创建并将其分解为多个步骤。
my $sql = 'SELECT * FROM foo';
my @where, @args;
if ($some_condition)
push @where, 'foo BETWEEN ? AND ?';
push @args, $datetime_from, $datetime_to;
if ($another_condition)
push @where, 'id > ?';
push @args, $id;
if (@where)
$sql .= ' WHERE ' . join( ' AND ', @where);
$sql .= ' GROUP BY id';
这样，SQL 的顺序就会正确。
将来，当您的 SQL 不起作用时，将其调试到您的服务器日志中，然后针对您的 mysql 服务器手动运行它以查看发生了什么。
【讨论】：
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