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改为

$con=mysql_connect('localhost','root','');

if(!$con)

die('连接数据库失败');

mysql_select_db('comment_db',$con);

$mysql_sql="create table comment_tab(

id mediumint unsigned NOT NULL auto_increment,

nickname char(16) NOT NULL default '',

email varchar(60) default NULL,

comment text NOT NULL,

createtime int(10) unsigned default '0',

reply text ,

replytime int(10) ,

PRIMARY KEY(id))";

if(!mysql_query($mysql_sql,$con))

die('创建表格失败');

?>

实际上就是把 PRIMARY KEY('id') 改为 PRIMARY KEY(id)

然后如果想加引擎 编码之类的 可以这样写

$con=mysql_connect('localhost','root','');

if(!$con)

die('连接数据库失败');

mysql_select_db('comment_db',$con);

$mysql_sql="create table comment_tab(

id mediumint unsigned NOT NULL auto_increment,

nickname char(16) NOT NULL default '',

email varchar(60) default NULL,

comment text NOT NULL,

createtime int(10) unsigned default '0',

reply text ,

replytime int(10) ,

PRIMARY KEY(id)

)engine=MyISAM default charset=utf8 auto_increment=1;";

if(!mysql_query($mysql_sql,$con))

die('创建表格失败');

?>