PHP MySQL Where 子句
WHERE 子句
WHERE 子句用于提取满足指定标准的的记录。
语法
SELECT column_name(s)
FROM table_name
WHERE column_name operator value
FROM table_name
WHERE column_name operator value
如需学习更多关于 SQL 的知识，请访问我们的 SQL 教程。
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。
实例
下面的实例将从 "Persons" 表中选取所有 FirstName='Peter' 的行：
<?php
$con=mysqli_connect("example.com","peter","abc123","my_db");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . 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>";
}
?>
$con=mysqli_connect("example.com","peter","abc123","my_db");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . 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>";
}
?>
以上代码将输出：
Peter Griffin
