2024年03月28日 建站教程
1、连接数据库
$host = 'localhost';
$username = 'root';
$password = 'password';
$dbname = 'webnet';
// 创建数据库连接
$db = new mysqli($host, $username, $password, $dbname);
// 检查连接是否成功
if ($db->connect_error) {
die("连接失败: " . $db->connect_error);
} else {
echo "连接成功！";
}
2、查询数据
$sql = "SELECT * FROM table";
$result = $db->query($sql);
if ($result->num_rows > 0) {
while ($row = $result->fetch_assoc()) {
echo "id: " . $row["id"] . " - Name: " . $row["name"] . "
";
}
} else {
echo "没有数据";
}
3、插入数据
$name = '小米';
$school = '清北';
$sql = "INSERT INTO table (name, school) VALUES ('$name', '$school')";
if ($db->query($sql) === TRUE) {
echo "新记录插入成功！";
} else {
echo "Error: " . $sql . "<br>" . $db->error;
}
4、更新数据
$id = 10;
$newName = 'Jane Doe';
$sql = "UPDATE table SET name='$newName' WHERE id=$id";
if ($db->query($sql) === TRUE) {
echo "记录更新成功！";
} else {
echo "Error: " . $sql . "<br>" . $db->error;
}
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