摘要：
PHP创建MySQL表。数据表具有唯一的名称，由行和列组成。使用MySQL i和PDO创建MySQL表create TABLE语句创建MySQL表。我们将创建一个名为“MyGuests”的表，它有五列：“id”、“firstname”、“lastname”、”email“和”reg_date“。在CREATETABLEMyGuests表中注意：数据类型指定列可以存储的数据类型。有关完整的数据类型，请参阅我们的数据类型参考手册。DEFAULTvalue-设置默认值UNSIGNED-使用无符号值类型0和正数AUTOINCREMENT-设置MySQL字段的值，使其在每次添加记录时自动增加1PRIMARYKEY-设置数据表中每条记录的唯一ID。php$servername=“localhost”；$username=“用户名”；$password=“password”；$dbname=“myDB”；//创建连接$conn=newmysqli//如果｛die；｝//sqltofcreatetable$sql=“CREATETABLEMyGuests”，请检查连接；如果｛echo“TableMyGuestscreatedsuccessfully”；｝否则｛echo-“Errorcreatingtable:”.$conn-˃error；｝$conn-˃close（）；？
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
)
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。
在设置了数据类型后，你可以为每个列指定其他选项的属性：
NOT NULL - 每一行都必须含有值（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();
?>
$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);
?>
$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;
?>
$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;
?>