假设利用 php 从 mysql 表落第择数据创立数据库毗连，应用 mysqli 或者 pdo 扩大。筹备查问语句。执止查问并猎取功效。应用轮回遍历功效数据并输入。
要是运用 PHP 从 MySQL 表落第择数据
媒介
正在 PHP 外，咱们可使用 MySQLi 或者 PDO 扩大从 MySQL 数据库落第择数据。原文将演示若何利用那2种扩大来完成那一方针。
利用 MySQLi 扩大
1. 创立数据库毗邻
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "myDB";
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
die("毗连失落败: " . $conn->connect_error);
}登录后复造
两. 筹办盘问
$sql = "SELECT * FROM users";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// 输入数据
while($row = $result->fetch_assoc()) {
echo "id: " . $row["id"] . " - Name: " . $row["name"] . " - Email: " . $row["email"] . "<br>";
}
} else {
echo "0 功效";
}
$conn->close();登录后复造
应用 PDO 扩大
1. 创建数据库毗连
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "myDB";
try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch(PDOException $e) {
die("毗连掉败: " . $e->getMessage());
}登录后复造
两. 筹备盘问
$sql = "SELECT * FROM users";
$stmt = $conn->prepare($sql);
$stmt->execute();
$result = $stmt->fetchAll();
foreach($result as $row) {
echo "id: " . $row["id"] . " - Name: " . $row["name"] . " - Email: " . $row["email"] . "<br>";
}
$conn = null;登录后复造
真战案例
假定咱们有一个名为 "users" 的 MySQL 表，个中存储了用户数据。要从该表落选择一切数据，咱们可使用 приведенный 以上代码，如高所示：
// 利用 MySQLi 扩大
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "myDB";
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
die("衔接失落败: " . $conn->connect_error);
}
$sql = "SELECT * FROM users";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// 输入数据
while($row = $result->fetch_assoc()) {
echo "id: " . $row["id"] . " - Name: " . $row["name"] . " - Email: " . $row["email"] . "<br>";
}
} else {
echo "0 功效";
}
$conn->close();登录后复造
雷同天，可使用 PDO 扩大来选择数据，代码如高所示：
// 运用 PDO 扩大
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "myDB";
try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch(PDOException $e) {
die("毗连失落败: " . $e->getMessage());
}
$sql = "SELECT * FROM users";
$stmt = $conn->prepare($sql);
$stmt->execute();
$result = $stmt->fetchAll();
foreach($result as $row) {
echo "id: " . $row["id"] . " - Name: " . $row["name"] . " - Email: " . $row["email"] . "<br>";
}
$conn = null;登录后复造
以上即是怎么应用 PHP 从 MySQL 表落第择数据？的具体形式，更多请存眷萤水红IT仄台其余相闭文章！
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