如何使用mysql在php中将行更改为cloumn

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

// 使用MySQLi扩展
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 使用PDO扩展
try {
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch(PDOException $e) {
    echo "连接失败: " . $e->getMessage();
}
?>

SELECT
  MAX(CASE WHEN column_name = 'name' THEN column_value END) AS name,
  MAX(CASE WHEN column_name = 'age' THEN column_value END) AS age,
  MAX(CASE WHEN column_name = 'gender' THEN column_value END) AS gender
FROM
  your_table
GROUP BY
  row_id;

SELECT
  MAX(CASE column_name WHEN 'name' THEN column_value END) AS name,
  MAX(CASE column_name WHEN 'age' THEN column_value END) AS age,
  MAX(CASE column_name WHEN 'gender' THEN column_value END) AS gender
FROM
  your_table
GROUP BY
  row_id;

<?php
$sql = "SELECT ..."; // 编写SQL查询
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // 输出每行数据
    while($row = $result->fetch_assoc()) {
        echo "Name: " . $row["name"]. " - Age: " . $row["age"]. " - Gender: " . $row["gender"]. "<br>";
    }
} else {
    echo "没有结果";
}

$conn->close();
?>

<?php
$sql = "SELECT ..."; // 编写SQL查询
$result = $conn->query($sql);

if ($result->rowCount() > 0) {
    // 输出每行数据
    while($row = $result->fetch(PDO::FETCH_ASSOC)) {
        echo "Name: " . $row["name"]. " - Age: " . $row["age"]. " - Gender: " . $row["gender"]. "<br>";
    }
} else {
    echo "没有结果";
}

$conn = null;
?>