PHP 创建 MySQL 表 · W3School PHP 教程

# PHP 创建 MySQL 表一个数据表有一个唯一名称，并有行和列组成。 ## 使用 MySQLi 和 PDO 创建 MySQL 表 CREATE TABLE 语句用于创建 MySQL 表。我们将创建一个名为 "MyGuests" 的表，有 5 个列： "id", "firstname", "lastname", "email" 和 "reg_date": ``` 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 ) ``` **上表中的注意事项:** 数据类型指定列可以存储什么类型的数据。完整的数据类型请参考我们的 [数据类型参考手册](/sql/sql-datatypes.html)。在设置了数据类型后，你可以为没个列指定其他选项的属性： * NOT NULL - 没一行都必须含有值（不能为空），null 值是不允许的。 * DEFAULT value - 设置默认值 * UNSIGNED - 使用无符号数值类型，0 及正数 * AUTO INCREMENT - 设置 MySQL 字段的值在新增记录时每次自动增长 1 * PRIMARY KEY - 设置数据表中每条记录的唯一标识。通常列的 PRIMARY KEY 设置为 ID 数值，与 AUTO_INCREMENT 一起使用。每个表都应该有一个主键(本列为 "id" 列)，主键必须包含唯一的值。以下实例展示了如何在 PHP 中创建表： ## 实例 (MySQLi - 面向对象) ``` <?php $servername = "localhost"; $username = "username"; $password = "password"; $dbname = "myDB"; // 创建连接 $conn = new mysqli($servername, $username, $password, $dbname); // 检测连接 if ($conn->connect_error) { die("Connection failed: " . $conn->connect_error); } // sql to create table $sql = "CREATE TABLE MyGuests ( id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY, firstname VARCHAR(30) NOT NULL, lastname VARCHAR(30) NOT NULL, email VARCHAR(50), reg_date TIMESTAMP )"; if ($conn->query($sql) === TRUE) { echo "Table MyGuests created successfully"; } else { echo "Error creating table: " . $conn->error; } $conn->close(); ?> ``` ## 实例 (MySQLi - 面向过程) ``` <?php $servername = "localhost"; $username = "username"; $password = "password"; $dbname = "myDB"; // 创建连接 $conn = mysqli_connect($servername, $username, $password, $dbname); // 检测连接 if (!$conn) { die("Connection failed: " . mysqli_connect_error()); } // sql to create table $sql = "CREATE TABLE MyGuests ( id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY, firstname VARCHAR(30) NOT NULL, lastname VARCHAR(30) NOT NULL, email VARCHAR(50), reg_date TIMESTAMP )"; if (mysqli_query($conn, $sql)) { echo "Table MyGuests created successfully"; } else { echo "Error creating table: " . mysqli_error($conn); } mysqli_close($conn); ?> ``` ## 实例 (PDO) ``` <?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); // sql to create table $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 )"; // use exec() because no results are returned $conn->exec($sql); echo "Table MyGuests created successfully"; } catch(PDOException $e) { echo $sql . "<br>" . $e->getMessage(); } $conn = null; ?> ```