PHP使用PDO创建MySQL数据库、表及插入多条数据操作

<?php
$servername = "localhost";
$username = "username";
$password = "password";
try {
  $conn = new PDO("mysql:host=$servername", $username, $password);
  // 设置 PDO 错误模式为异常
  $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
  $sql = "CREATE DATABASE myDBPDO";
  // 使用 exec() ，因为没有结果返回
  $conn->exec($sql);
  echo "数据库创建成功<br>";
}
catch(PDOException $e)
{
  echo $sql . "<br>" . $e->getMessage();
}
$conn = null;
?>

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDBPDO";
try {
  $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
  // 设置 PDO 错误模式，用于抛出异常
  $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
  // 使用 sql 创建数据表
  $sql = "CREATE TABLE MyGuests (
  id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
  firstname VARCHAR(30) NOT NULL,
  lastname VARCHAR(30) NOT NULL,
  email VARCHAR(50),
  reg_date TIMESTAMP
  )";
  // 使用 exec() ，没有结果返回
  $conn->exec($sql);
  echo "数据表 MyGuests 创建成功";
}
catch(PDOException $e)
{
  echo $sql . "<br>" . $e->getMessage();
}
$conn = null;
?>

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDBPDO";
try {
  $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
  // set the PDO error mode to exception
  $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
  // 开始事务
  $conn->beginTransaction();
  // SQL 语句
  $conn->exec("INSERT INTO MyGuests (firstname, lastname, email)
  VALUES ('John', 'Doe', 'john@example.')");
  $conn->exec("INSERT INTO MyGuests (firstname, lastname, email)
  VALUES ('Mary', 'Moe', 'mary@example.')");
  $conn->exec("INSERT INTO MyGuests (firstname, lastname, email)
  VALUES ('Julie', 'Dooley', 'julie@example.')");
  // 提交事务
  $conn->mit();
  echo "新记录插入成功";
}
catch(PDOException $e)
{
  // 如果执行失败回滚
  $conn->rollback();
  echo $sql . "<br>" . $e->getMessage();
}
$conn = null;
?>