PHP MySQL Where 子句
<div id="article_content" class="article_content clearfix"><link rel="stylesheet" href="https://csdnimg.cn/release/blogv2/dist/mdeditor/css/editerView/kdoc_html_views-1a98987dfd.css">
<link rel="stylesheet" href="https://csdnimg.cn/release/blogv2/dist/mdeditor/css/editerView/ck_htmledit_views-6e43165c0a.css">
<div id="content_views" class="htmledit_views">
<h2>WHERE 子句</h2>
<p>WHERE 子句用于提取满足指定标准的的记录。</p>
<h3>语法</h3>
<pre>SELECT column_name(s)
FROM table_name
WHERE column_name operator value</pre>
<p>如需学习更多关于 SQL 的知识，请访问我们的 <ahref="https://www.runoob.com/php/php-mysql-where.html#">SQL 教程</a>。</p>
<p>为了让 PHP 执行上面的语句，我们必须使用 mysqli_query() 函数。该函数用于向 MySQL 连接发送查询或命令。</p>
<h3>实例</h3>
<p>下面的实例将从 "Persons" 表中选取所有 FirstName='Peter' 的行：</p>
<pre><?php
$con=mysqli_connect("localhost","username","password","database");
// 检测连接
if (mysqli_connect_errno())
{
echo "连接失败: " . mysqli_connect_error();
}
$result = mysqli_query($con,"SELECT * FROM Persons
WHERE FirstName='Peter'");
while($row = mysqli_fetch_array($result))
{
echo $row['FirstName'] . " " . $row['LastName'];
echo "<br>";
}
?></pre>
<p>以上代码将输出：</p>
<pre>Peter Griffin</pre>
</div>
</div>
<div id="treeSkill"></div>
页:
[1]