怎么使 Mysql 数据同步
怎么使 Mysql 数据同步
先假设有主机 A 和 B ( Linux 系统),主机 A 的 IP 分别是 1.2.3.4 (当然,也可以是动态的),主机 B 的 IP 是 5.6.7.8 。两个主机都装上了 PHP+Mysql ,现在操作的是主机 A 上的资料,如果另外一个主机 B 想跟 A 的资料进行同步,应该怎么做呢?
OK,我们现在就动手。
首先,如果要想两个主机间的资料同步,一种方法就是主机 A 往主机 B 送资料,另外一种主法就是主机 B 到主机 A 上拿资料,因为 A 的 IP 是动态的(假设),所以我们就得从主机 A 往主机 B 送资料。
在主机 B 上创建一个 Mysql 账户。
# GRANT ALL ON test.* TO user@% IDENTIFIED BY "password"; //创建用户 user,可以从任何机器访问到主机 B 上的 test 数据库。
如果这里显示错误,先把 % 改为一个 IP ,然后再利用 phpMyAdmin 把 IP 改为 % ,测试无误后就可以写 php 程序。
$link=mysql_pconnect("localhost","user","password");
mysql_pconnect("localhost","user","password"); //连接本机(主机A)的数据库
mysql_select_db("test"); //选择数据库test
$re=mysql_query("select * from table order by id desc");
$num=mysql_numrows($re);
if (!empty($num)) {
$id=mysql_result($re,0,"id"); //获得本机table表的最大ID
}
mysql_close($link); //关闭与本机数据库的连接
$link=mysql_pconnect("5.6.7.8","test","test");
mysql_pconnect("5.6.7.8","test","test"); //连接主机B的数据库
mysql_select_db("test"); //选择数据库test,此数据库应该与主机A上test数据库的结构一样。
$re=mysql_query("select * from table order by id desc");
$num=mysql_numrows($re);
if (!empty($num)) {
$remote_id=mysql_result($re,0,"id"); //获得主机Btable表的最大ID
}
if ($id>$remote_id) {
$result_id=$id-$remote_id; //如果主机A中table的最大ID大于主机B中table表的最大ID,说明两个
} 的资料不同
mysql_close($link); //关闭主机B的数据库连接
$link=mysql_pconnect("localhost","user","password");
mysql_pconnect("localhost","user","password");
mysql_select_db("test");
if (empty($result_id)) $result_id=0;
if (empty($remote_id)) $remote_id=0; //如果主机B中的table的最大ID为空(里面没有资料),那么就等0
$re=mysql_query("select * from table limit $remote_id,$result_id"); //取出主机A中table表与主机B中table表里不同的资料
$num=mysql_numrows($re);
if (!empty($num)) {
for ($i=0;$i$test[$i]=mysql_result($re,$i,"test"); //把不同的资料放入一个数组里
}
}
mysql_close($link); //关闭主机A的数据库连接
$link=mysql_pconnect("5.6.7.8","user","password");
mysql_pconnect("5.6.7.8","user","pasword");
mysql_select_db("test");
for ($j=0;$j
mysql_query("insert into table (test) values(\'$test[$j]\')");
}
mysql_close($link); //关闭主机B的数据库连接
?>
这时就初步实现了 A 主机和 B 主机数据的同步,但现在还需要人手动每次去激活这个程序,有没有办法把它作为一个脚本一样的,放在 crontab 里面指定时间自动执行呢?
在安装 php 时会自动生一个叫 php 的可执行文件,一般在/你安装的 php 目录 /bin 下面,不过较底的版本好像没有,如果没有这个文件,你就得升级你的 php 。
#php -q test.php
php 原本是应用在网页应用的﹐因此它会送出 HTML 的 Header﹐但是在此我们是要将 php 用作 Shell Script﹐"-q" 就是表示不要送出 Header 的意思.
最后编辑 /etc/crontab 里的文件,加上下面这一句。
0 0 * * * root /home/httpd/html/test //每天晚上零点执/home/httpd/html/test文件(具体使用方法请查看cron的相关资料)
OK,到这里差不多就已完成 Mysql 数据的同步了,如果各位还有兴趣的话,可以想一个连编辑、删除都能同步的更好的办法。

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