PHP与不同数据库的连接：MySQL、PostgreSQL、Oracle和更多

sudo apt-get install php7.2-mysqli

$servername = "localhost";
$username = "root";
$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);
}

sudo apt-get install php7.2-pgsql

$servername = "localhost";
$username = "postgres";
$password = "my_password";
$dbname = "mydb";

// 创建连接
$conn = pg_connect("host=$servername dbname=$dbname user=$username password=$password");

// 检查连接
if (!$conn) {
  die("连接失败: " . pg_last_error($conn));
}

sudo apt-get install php7.2-oci8

$servername = "localhost/orcl";
$username = "oracle_user";
$password = "my_password";

// 创建连接
$conn = oci_connect($username, $password, $servername);

// 检查连接
if (!$conn) {
  $e = oci_error();
  die("连接失败: " . $e['message']);
}

$sql = "SELECT * FROM users";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
  // 输出数据
  while($row = $result->fetch_assoc()) {
    echo "id: " . $row["id"] . " - Name: " . $row["name"] . "<br>";
  }
} else {
  echo "没有数据";
}

$sql = "SELECT * FROM users WHERE id > 10";
$result = pg_query($conn, $sql);

if (pg_num_rows($result) > 0) {
  // 输出数据
  while($row = pg_fetch_assoc($result)) {
    echo "id: " . $row["id"] . " - Name: " . $row["name"] . "<br>";
  }
} else {
  echo "没有数据";
}

$sql = "UPDATE users SET name = 'John Doe' WHERE id = 1";
$stmt = oci_parse($conn, $sql);

if (oci_execute($stmt)) {
  echo "记录更新成功";
} else {
  echo "更新记录失败";
}