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PHP从入门到精通（第三版）18/3实例代码运行出错问题
发表在PHP图书答疑
2014-06-13
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<link href="style.css" rel="stylesheet">
<title>应用mysql_fetch_array()函数从数组结果集中获取信息</title>
</head>
<body>
<table width="609" height="134" border="1" cellpadding="0" cellspacing="0" bgcolor="#9E7DB4" align="center">
<form name="myform" method="post" action="">
<tr>
<td width="605" height="51" bgcolor="#CC99FF"><div align="center">请输入图书名称
<input name="txt_book" type="text" id="txt_book" size="25" >
<input type="submit" name="Submit" value="查询">
</div></td>
</tr>
</form>
<tr valign="top" bgcolor="#FFFFFF">
<td height="81">
<table width="100%" border="0" cellpadding="0" cellspacing="0">
<tr>
<td height="79" align="center" valign="top"> <br>
<table width="572" border="0" align="center" cellpadding="0" cellspacing="1" bgcolor="#625D59">
<tr align="center" bgcolor="#CC99FF">
<td width="46" height="20">编号</td>
<td width="167">图书名称</td>
<td width="90">出版时间</td>
<td width="70">图书定价</td>
<td width="78">作者</td>
<td width="114">出版社</td>
</tr>
<?php
$link=mysql_connect("localhost","root","root") or die("数据库连接失败".mysql_error());
mysql_select_db("db_database18",$link);
mysql_query("set names gb2312");
$sql=mysql_query("select * from tb_book");
$info=mysql_fetch_array($sql);
if ($_POST[Submit]=="查询"){
$txt_book=$_POST[txt_book];
$sql=mysql_query("select * from tb_book where bookname like '%".trim($txt_book)."%'"); //如果选择的条件为"like",则进行模糊查询
$info=mysql_fetch_array($sql);
}
if($info==false){ //如果检索的信息不存在，则输出相应的提示信息
echo "<div align='center' style='color:#FF0000; font-size:12px'>对不起，您检索的图书信息不存在!</div>";
}
do{
?>
<tr align="left" bgcolor="#FFFFFF">
<td height="20" align="center"><?php echo $info[id]; ?></td>
<td > <?php echo $info[bookname]; ?></td>
<td align="center"><?php echo $info[issuDate]; ?></td>
<td align="center"><?php echo $info[price]; ?></td>
<td align="center"> <?php echo $info[maker]; ?></td>
<td> <?php echo $info[publisher]; ?></td>
</tr>
<?php
}
while($info=mysql_fetch_array($sql));
?>
</table></td>
</tr>
</table>
<br></td>
</tr>
</table>
</body>
</html>
运行结果如下：
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in C:\AppServ\www\gys\index.php on line 39
对不起，您检索的图书信息不存在!
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in C:\AppServ\www\gys\index.php on line 60
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<link href="style.css" rel="stylesheet">
<title>应用mysql_fetch_array()函数从数组结果集中获取信息</title>
</head>
<body>
<table width="609" height="134" border="1" cellpadding="0" cellspacing="0" bgcolor="#9E7DB4" align="center">
<form name="myform" method="post" action="">
<tr>
<td width="605" height="51" bgcolor="#CC99FF"><div align="center">请输入图书名称
<input name="txt_book" type="text" id="txt_book" size="25" >
<input type="submit" name="Submit" value="查询">
</div></td>
</tr>
</form>
<tr valign="top" bgcolor="#FFFFFF">
<td height="81">
<table width="100%" border="0" cellpadding="0" cellspacing="0">
<tr>
<td height="79" align="center" valign="top"> <br>
<table width="572" border="0" align="center" cellpadding="0" cellspacing="1" bgcolor="#625D59">
<tr align="center" bgcolor="#CC99FF">
<td width="46" height="20">编号</td>
<td width="167">图书名称</td>
<td width="90">出版时间</td>
<td width="70">图书定价</td>
<td width="78">作者</td>
<td width="114">出版社</td>
</tr>
<?php
$link=mysql_connect("localhost","root","root") or die("数据库连接失败".mysql_error());
mysql_select_db("db_database18",$link);
mysql_query("set names gb2312");
$sql=mysql_query("select * from tb_book");
$info=mysql_fetch_array($sql);
if ($_POST[Submit]=="查询"){
$txt_book=$_POST[txt_book];
$sql=mysql_query("select * from tb_book where bookname like '%".trim($txt_book)."%'"); //如果选择的条件为"like",则进行模糊查询
$info=mysql_fetch_array($sql);
}
if($info==false){ //如果检索的信息不存在，则输出相应的提示信息
echo "<div align='center' style='color:#FF0000; font-size:12px'>对不起，您检索的图书信息不存在!</div>";
}
do{
?>
<tr align="left" bgcolor="#FFFFFF">
<td height="20" align="center"><?php echo $info[id]; ?></td>
<td > <?php echo $info[bookname]; ?></td>
<td align="center"><?php echo $info[issuDate]; ?></td>
<td align="center"><?php echo $info[price]; ?></td>
<td align="center"> <?php echo $info[maker]; ?></td>
<td> <?php echo $info[publisher]; ?></td>
</tr>
<?php
}
while($info=mysql_fetch_array($sql));
?>
</table></td>
</tr>
</table>
<br></td>
</tr>
</table>
</body>
</html>
运行结果如下：
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in C:\AppServ\www\gys\index.php on line 39
对不起，您检索的图书信息不存在!
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in C:\AppServ\www\gys\index.php on line 60
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