用PHP和MYSQL建立计数器过程详解

2024-07-24 12:56:37

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运行mysql.exe
mysql> 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：

<?php
$myvar = "来访人数：";
echo $myvar;
?>

<?php
mysql_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>