phpMyAdmin中mysql查询语句中分号注意事项

最近又在看php , 新学者, 菜鸟的说》》》》

今天做了一个简单的mysql查询功能,

index.html 查询条件页面:

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>search page</title>
</head>
<body>
<form action="search.php" method="post">
<table width="80%" border="1" align="center" cellpadding="2" bordercolor="#0000FF" bordercolorlight="#7D7DFF" bordercolordark="#0000A0" bgcolor="#E8E8E8">
	<tr>
		<td width="20%" height="29" align="left" valign="middle">装饰理念</td>
		<td width="88%" height="29" align="left">
			<select name="idea" id="select1">
				<option value="实用简约">实用简约</option>
				<option value="朴素设计">朴素设计</option>
			</select>
		</td>
	</tr>
	<tr>
		<td width="20%" height="29" align="left" valign="middle">房屋类型</td>
		<td width="88%" height="29" align="left">
			<select name="housetype" id="select2">
				<option value="二室一厅">二室一厅</option>
				<option value="三室一厅">三室一厅</option>
			</select>
		</td>
	</tr>
	<tr>
		<td width="20%" height="29" align="left" valign="middle">装修风格</td>
		<td width="88%" height="29" align="left">
			<select name="style" id="select3">
				<option value="田园风格">田园风格</option>
				<option value="中式风格">中式风格</option>
			</select>
		</td>
	</tr>
	<tr>
		<td width="20%" height="29" align="left" valign="middle">房屋用途</td>
		<td width="88%" height="29" align="left">
			<select name="app" id="select4">
				<option value="自住">自住</option>
				<option value="出租">出租</option>
			</select>
		</td>
	</tr>
	<tr>
		<td width="20%" height="29" align="left" valign="middle">期望价格</td>
		<td width="88%" height="29" align="left">
			<select name="price" id="select5">
				<option value="A">50000以下</option>
				<option value="B">50000以上</option>
			</select>
		</td>
	</tr>
	<tr>
		<td width="20%" height="29" align="left" valign="middle">发布时间</td>
		<td width="88%" height="29" align="left">
			<select name="pubdate" id="select6">
				<option value="A">最近一周</option>
				<option value="B">最近一个月</option>
				<option value="C">最近三个月</option>
				<option value="D">最近一年</option>
			</select>
		</td>
	</tr>
	<tr>
		<td>  </td>
		<td> <input type="submit"  value="提交"> </td>
	</tr>
</table>
</form>
</body>
</html>
装饰理念
房屋类型
装修风格
房屋用途
期望价格
发布时间
 

search.php

 1 <html>
 2 <head>
 3 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
 4 <title>search result</title>
 5 </head>
 6 
 7 <body>
 8 <table align="center">
 9 <?php
10     $idea = $_POST['idea'];
11     $housetype = $_POST['housetype'];
12     $style = $_POST['style'];
13     $app = $_POST['app'];
14     $price = $_POST['price'];
15     $pubdate = $_POST['pubdate'];
16     # echo $idea, ' ', $housetype, ' ', $style, ' ', $app, ' ', $price, ' ', $pubdate;
17     $conn = mysql_connect("localhost", "thoupin", "D3w89X7z");
18     mysql_select_db("sample");
19     $query = "select * from `case` where `idea`='".$idea."'";
20     
21     # housetype
22     if($housetype!="") {
23         $query.=" && `housetype`='".$housetype."'";
24     } 
25     # style
26     if($style!="") {
27         $query.=" && `style`='".$style."'";
28     }
29     # app
30     if($app!="") {
31         $query.=" && `app`='".$app."'";
32     }
33     # price
34     /*
35     if($price!="") {
36         switch($price) {
37             case "A":
38                 $query.=" && `price`<50000";
39             break;
40             case "B":
41                 $query.=" && `price`>=50000";
42             break;
43         }
44     }
45     # pubdate
46 
47     if($pubdate!="") {
48         switch($pubdate) {
49             case "A":
50                 $query.=" && TO_DAYS(NOW()) - TO_DAYS(`pubdate`)<=7";
51             break;
52             case "B":
53                 $query.=" && TO_DAYS(NOW()) - TO_DAYS(`pubdate`)<=30";
54             break;
55             case "C":
56                 $query.=" && TO_DAYS(NOW()) - TO_DAYS(`pubdate`)<=91";
57             break;
58             case "D":
59                 $query.=" && TO_DAYS(NOW()) - TO_DAYS(`pubdate`)<=183";
60             break;
61         }
62     }
63     */
64     # result
65     $query.=" order by `pid` limit 0, 20;";
66     @mysql_query("set names 'utf8'", $conn);
67     $result = mysql_query($query, $conn);
68     if($result) {
69         $rows = mysql_num_rows($result);
70         if($rows != 0) {
71             while($myrow=mysql_fetch_array($result)) {
72                 echo '<tr>';
73                 echo "<td width='15' height='12'><input name='t1' type='radio' value=''/></td>";
74                 echo "<td width='540' height='12'>
75                       $myrow[pid]&nbsp;
76                       $myrow[idea]&nbsp;
77                       $myrow[style]($myrow[housetype])&nbsp;
78                       <font style='font-size:9pt'>[$myrow[pubdate]]</font>";
79                 echo '</td>';
80                 echo "<td width='75' height='12'><a href='' target='_blank'>详细信息</a></td>";
81                 echo '</td>'; 
82             }
83         }
84     } else {
85         echo "<tr><td><div align='center'><br/><br/>没有符合查找条件的记录!</div></td></tr>";
86     }
87     
88     echo "<hr width=\"100%\" size=\"1\">";
89 ?>
90 </table>
91 </body>
92 </html>

运行的结果为:

  


1  实用简约  田园风格(二室一厅)  [2012-02-17 13:23:17] 详细信息

注意这一句:

 $query = "select * from `case` where `idea`='".$idea."'";
当时我是直接一律用的单引号 (即" ' "), 然后就是如下结果:

尔后将单引号改为`` 后可以得到正确结果:

可见在phpMyAdmin 的查询环境(windows utf-8)中,单引号应为``;

但是绝不是一律使用``, 例如下列情况:

   可见, 对于条件字符,应使用双引或者单引 均可,(而非``):

另外,对于数字, 需不需要引号为所谓, 但建议加上。

对于表名,列名, 应使用`` , 而对于条件数据, 应使用'', 或者""。

 

posted on 2012-05-16 19:19  thoupin  阅读(781)  评论(0编辑  收藏  举报

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