【发布时间】：2014-06-23 19:00:42
【问题描述】：
此表单是一个搜索表单，允许用户使用脚本为下拉框的场地和类别字段搜索事件，以及作为用户输入文本框的价格和事件标题，如关键字所示通过代码显示输入的内容与数据库中的字段匹配 它应该输出该事件的所有相关信息 如果在任一搜索字段上进行了任何匹配，则复选框允许用户识别他们想要搜索的标准，如果复选框字段未勾选则 SQL 查询不会搜索对应字段的关键字。
问题是，这一切似乎都运行良好，但如果 Venue 和 Category 字段仅用于搜索活动，则似乎没有结果。但是，如果我选择另一个字段，则所有内容都会正确输出，包括场地和类别字段。
数据库：http://i.imgur.com/d4uoXtE.jpg
HTML 表单
<form name="searchform" action ="PHP/searchfunction.php" method = "post" >
<h2>Event Search:</h2>
Use the Check Boxes to indicate which fields you watch to search with
<br /><br />
<h2>Search by Venue:</h2>
<?php
echo "<select name = 'venueName'>";
$queryresult2 = mysql_query($sql2) or die (mysql_error());
while ($row = mysql_fetch_assoc($queryresult2)) {
echo "\n";
$venueID = $row['venueID'];
$venueName = $row['venueName'];
echo "<option value ='$venueName'";
echo ">$venueName</option>";
}# when the option selected matches the queryresult it will echo this
echo "</select>";
echo" <input type='checkbox' name='S_venueName'>";
mysql_free_result($queryresult2);
mysql_close($conn);
?>
<br /><br />
<h2>Search by Category:</h2>
<?php
include 'PHP/database_conn.php';
$sql3 ="SELECT catID, catDesc
FROM te_category";
echo "<select name = 'catdesc'>";
$queryresult3 = mysql_query($sql3) or die (mysql_error());
while ($row = mysql_fetch_assoc($queryresult3)) {
echo "\n";
$catID = $row['catID'];
$catDesc = $row['catDesc'];
echo "<option value = '$catDesc'";
echo ">$catDesc </option>";
}
echo "</select>";
mysql_free_result($queryresult3);
mysql_close($conn);
?>
<input type="checkbox" name="S_catDes">
<br /><br />
<h2>Search By Price</h2>
<input type="text" name="S_price" />
<input type="checkbox" name="S_CheckPrice">
<br /><br />
<h2>Search By Event title</h2>
<input type="text" name="S_EventT" />
<input type="checkbox" name="S_EventTitle">
<br /><br />
<input name="update" type="submit" id="update" value="Search">
</form>
处理表单数据的 PHP 代码
<?php
include 'database_conn.php';
$venuename = $_POST['venueName']; //this is an integer
$catdesc = $_POST['catdesc']; //this is a string
$Price = $_POST['S_price'];
$EventT = $_POST['S_EventT'];
#the IF statements state if the tickbox is checked then search with these enquires
if (isset($_POST['S_VenueName'])) {
$sql = "SELECT * FROM te_venue WHERE venueName= '$venuename'";
}
if (isset($_POST['S_catDes'])) {
$sql = "SELECT * FROM te_category WHERE catID= '$catdesc'";
}
if (isset($_POST['S_CheckPrice'])) {
$sql = "SELECT * FROM te_events WHERE (eventPrice LIKE '%$Price%')";
}
if (isset($_POST['S_EventTitle'])) {
$sql = "SELECT * FROM te_events WHERE (eventTitle LIKE '%$EventT%')";
}
$queryresult = mysql_query($sql) or die (mysql_error());
while ($row = mysql_fetch_assoc($queryresult))
{
echo "Event Title: "; echo $row['eventTitle'];
echo "<br />";
echo "Event Description: "; echo $row['eventDescription'];
echo "<br />";
echo "Event Venue "; echo "$venuename";
echo "<br />";
echo "Event Category "; echo "$catdesc";
echo "<br />";
echo "Event Start Date "; echo $row['eventStartDate'];
echo "<br />";
echo "Event End Date "; echo $row['eventEndDate'];
echo "<br />";
echo "Event Price "; echo $row['eventPrice'];
echo "<br /><br />";
}
mysql_free_result($queryresult);
mysql_close($conn);
?>
【问题讨论】：
-
你的 $sql2 查询在哪里？
-
好问题，知道如何在我的 php 代码中实现它吗？