使用mysqli或PDO扩展函数连接MySQL数据库，执行SQL查询语句获取数据。
要连接MySQL数据库并获取数据，可以使用PHP的mysqli扩展或PDO扩展，下面是一个使用mysqli扩展的示例：
1、创建数据库连接
<?php $servername = "localhost"; $username = "username"; $password = "password"; $dbname = "myDB"; // 创建连接 $conn = new mysqli($servername, $username, $password, $dbname); // 检查连接 if ($conn>connect_error) { die("连接失败： " . $conn>connect_error); } ?>
2、编写SQL查询语句
$sql = "SELECT id, firstname, lastname FROM MyGuests";
3、执行查询并获取结果
$result = $conn>query($sql);
4、输出查询结果
if ($result>num_rows > 0) {
// 输出每行数据
while($row = $result>fetch_assoc()) {
echo "id: " . $row["id"]. " Name: " . $row["firstname"]. " " . $row["lastname"]. "<br>";
}
} else {
echo "0 结果";
}
5、关闭数据库连接
$conn>close(); ?>
完整代码如下：
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";
// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);
// 检查连接
if ($conn>connect_error) {
die("连接失败： " . $conn>connect_error);
}
$sql = "SELECT id, firstname, lastname FROM MyGuests";
$result = $conn>query($sql);
if ($result>num_rows > 0) {
// 输出每行数据
while($row = $result>fetch_assoc()) {
echo "id: " . $row["id"]. " Name: " . $row["firstname"]. " " . $row["lastname"]. "<br>";
}
} else {
echo "0 结果";
}
$conn>close();
?>
原创文章，作者：K-seo，如若转载，请注明出处：https://www.kdun.cn/ask/487890.html
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