用PHP和MYSQL建立计数器过程详解
运行MYSQL.EXEmysql> create database counter;Query OK, 1 row affected (0.10 sec)
mysql> use counter;Database changed
mysql> create table tl(id integer(2),count integer(5));Query OK, 0 rows affected (0.21 sec)
mysql> show columns from tl;+-------+--------+------+-----+---------+-------+| Field | Type| Null | Key | Default | Extra |+-------+--------+------+-----+---------+-------+| id;| int(2) | YES; |;;| NULL;|;;;;|| count | int(5) | YES; |;;| NULL;|;;;;|+-------+--------+------+-----+---------+-------+2 rows in set (0.05 sec)
mysql> select * from tl;Empty set (0.08 sec)
mysql> insert into tl(id,count) values(1,1);Query OK, 1 row affected (0.02 sec)
mysql> select * from tl;+------+-------+| id| count |+------+-------+|;1 |;;1 |+------+-------+1 row in set (0.03 sec)
下面编写HTML文件内容：
<html><body>
<?php$myvar = '来访人数：';echo $myvar;?>
<?phpmysql_connect() or die('there are problems to connect to mysql!');$query='select * from tl';$result=mysql_db_query('counter',$query);if($result){ $r=mysql_fetch_array($result); $counter=$r['count']; $counter=$counter+1; echo $counter; $query='update tl set count='$counter' where id=1'; $result=mysql_db_query('counter',$query); mysql_close();}?></body></html>
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