详解在MySQL中创建表的教程_MySQL
创建表的命令要求：
- 表的名称
- 表字段名称
- 每个字段的定义
语法：
下面是通用的SQL语法来创建一个MySQL表：
CREATE TABLE table_name (column_name column_type);
现在，我们将创建下面的教程数据库表中。
tutorials_tbl( tutorial_id INT NOT NULL AUTO_INCREMENT, tutorial_title VARCHAR(100) NOT NULL, tutorial_author VARCHAR(40) NOT NULL, submission_date DATE, PRIMARY KEY ( tutorial_id ) );
这里几个项目需要说明：
- 使用字段属性NOT NULL，因为我们不希望此字段是NULL。因此如果用户试图创建一个与NULL值的记录，那么MySQL将产生一个错误。
- 字段属性AUTO_INCREMENT告诉MySQL的继续递增，下一个可用编号的id字段。
- 关键字PRIMARY KEY用于定义一个列作为主键。可以使用以逗号分隔的多个列定义一个主键。
从命令提示符创建表：
这是很容易的，从mysql>提示符下创建一个MySQL表。您将使用SQL命令 CREATE TABLE 创建一个表。
例子:
下面是一个例子，它创建 tutorials_tbl:
root@host# mysql -u root -p Enter password:******* mysql> use TUTORIALS; Database changed mysql> CREATE TABLE tutorials_tbl( -> tutorial_id INT NOT NULL AUTO_INCREMENT, -> tutorial_title VARCHAR(100) NOT NULL, -> tutorial_author VARCHAR(40) NOT NULL, -> submission_date DATE, -> PRIMARY KEY ( tutorial_id ) -> ); Query OK, 0 rows affected (0.16 sec) mysql>
注: MySQL终止命令，直到你给一个分号（;)结束时的SQL命令。
使用PHP脚本创建MySQL表:
要创建新的表中的任何现有的数据库，需要使用PHP函数mysql_query()。将通过它的第二个参数，正确的SQL命令来创建一个表。
例子:
下面是一个例子，使用PHP脚本来创建一个表：
<html>
<head>
<title>Creating MySQL Tables - by www.jb51.com</title>
</head>
<body>
<?php
$dbhost = 'localhost:3036';
$dbuser = 'root';
$dbpass = 'rootpassword';
$conn = mysql_connect($dbhost, $dbuser, $dbpass);
if(! $conn )
{
die('Could not connect: ' . mysql_error());
}
echo 'Connected successfully<br />';
$sql = "CREATE TABLE tutorials_tbl( ".
"tutorial_id INT NOT NULL AUTO_INCREMENT, ".
"tutorial_title VARCHAR(100) NOT NULL, ".
"tutorial_author VARCHAR(40) NOT NULL, ".
"submission_date DATE, ".
"PRIMARY KEY ( tutorial_id )); ";
mysql_select_db( 'TUTORIALS' );
$retval = mysql_query( $sql, $conn );
if(! $retval )
{
die('Could not create table: ' . mysql_error());
}
echo "Table created successfully\n";
mysql_close($conn);
?>
</body>
</html>
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