数据库表中都有自己独特的名字，由列和行的。
创建使用库MySQLi和PDO一个MySQL表
CREATE TABLE语句是用于在MySQL中创建一个表。
我们将创建一个表名为"MyGuests" ，有五列： "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
)
Notes on the table above:
数据类型指定列还能持有什么类型的数据。 对于所有可用的数据类型的完整参考，请访问我们的数据类型参考 。
数据类型后，可以为每列指定其他可选属性：
- NOT NULL - 每一行都必须包含该列的值，空值是不允许
- 默认值 - 设置在没有其他值传递被添加默认值
- UNSIGNED - 用于数字类型，存储的数据限制为正数和零
- 自动递增 - MySQL的自动1每次添加新的记录时间增加了字段的值
- PRIMARY KEY - 用于唯一标识表中的行。 与PRIMARY KEY设置列常常是一个ID号，并且经常与AUTO_INCREMENT使用
每个表都应有一个主键列(in this case: the "id" column) 。 它的值必须为表中的每个记录是唯一的。
下面的例子说明如何在PHP创建表：
实施例(MySQLi Object-oriented)
<?php
$servername = "localhost";
$username = "username";
$password =
"password";
$dbname =
"myDB";
// Create connection
$conn =
new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($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();
?>
实施例(MySQLi Procedural)
<?php
$servername = "localhost";
$username = "username";
$password =
"password";
$dbname =
"myDB";
// Create connection
$conn = mysqli_connect($servername, $username, $password,
$dbname);
// Check connection
if (!$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);
?>
实施例(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;
?>