數據庫表中都有自己獨特的名字，由列和行的。
創建使用庫MySQLi和PDO一個MySQL表
CREATE TABLE語句是用於在MySQL中創建一個表。
我們將創建一個表名為"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:
數據類型指定列還能持有什麼類型的數據。 對於所有可用的數據類型的完整參考，請訪問我們的數據類型參考 。
數據類型後，可以為每列指定其他可選屬性：
- NOT NULL - 每一行都必須包含該列的值，空值是不允許
- 默認值 - 設置在沒有其他值傳遞被添加默認值
- UNSIGNED - 用於數字類型，存儲的數據限制為正數和零
- 自動遞增 - MySQL的自動1每次添加新的記錄時間增加了字段的值
- PRIMARY KEY - 用於唯一標識表中的行。 與PRIMARY KEY設置列常常是一個ID號，並且經常與AUTO_INCREMENT使用
每個表都應有一個主鍵列(in this case: the "id" column) 。 它的值必須為表中的每個記錄是唯一的。
下面的例子說明如何在PHP創建表：
實施例(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();
?>
實施例(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);
?>
實施例(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;
?>