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Home Database Mysql Tutorial 怎么使 Mysql 數(shù)據(jù)同步_MySQL

怎么使 Mysql 數(shù)據(jù)同步_MySQL

Jun 01, 2016 pm 02:05 PM
test Host Synchronize how data database material

先假設(shè)有主機(jī) A 和 B ( Linux 系統(tǒng)),主機(jī) A 的 IP 分別是 1.2.3.4 (當(dāng)然,也可以是動態(tài)的),主機(jī) B 的 IP 是 5.6.7.8 。兩個主機(jī)都裝上了 PHP+Mysql ,現(xiàn)在操作的是主機(jī) A 上的資料,如果另外一個主機(jī) B 想跟 A 的資料進(jìn)行同步,應(yīng)該怎么做呢?

OK,我們現(xiàn)在就動手。

首先,如果要想兩個主機(jī)間的資料同步,一種方法就是主機(jī) A 往主機(jī) B 送資料,另外一種主法就是主機(jī) B 到主機(jī) A 上拿資料,因?yàn)?A 的 IP 是動態(tài)的(假設(shè)),所以我們就得從主機(jī) A 往主機(jī) B 送資料。

在主機(jī) B 上創(chuàng)建一個 Mysql 賬戶。
# GRANT ALL ON test.* TO user@% IDENTIFIED BY "password"; //創(chuàng)建用戶 user,可以從任何機(jī)器訪問到主機(jī) B 上的 test 數(shù)據(jù)庫。

如果這里顯示錯誤,先把 % 改為一個 IP ,然后再利用 phpMyAdmin 把 IP 改為 % ,測試無誤后就可以寫 php 程序。

$link=mysql_pconnect("localhost","user","password");
mysql_pconnect("localhost","user","password"); //連接本機(jī)(主機(jī)A)的數(shù)據(jù)庫
mysql_select_db("test"); //選擇數(shù)據(jù)庫test

$re=mysql_query("select * from table order by id desc");
$num=mysql_numrows($re);
if (!empty($num)) {
$id=mysql_result($re,0,"id"); //獲得本機(jī)table表的最大ID
}

mysql_close($link); //關(guān)閉與本機(jī)數(shù)據(jù)庫的連接


$link=mysql_pconnect("5.6.7.8","test","test");
mysql_pconnect("5.6.7.8","test","test"); //連接主機(jī)B的數(shù)據(jù)庫
mysql_select_db("test"); //選擇數(shù)據(jù)庫test,此數(shù)據(jù)庫應(yīng)該與主機(jī)A上test數(shù)據(jù)庫的結(jié)構(gòu)一樣。
$re=mysql_query("select * from table order by id desc");
$num=mysql_numrows($re);
if (!empty($num)) {
$remote_id=mysql_result($re,0,"id"); //獲得主機(jī)Btable表的最大ID
}

if ($id>$remote_id) {
$result_id=$id-$remote_id; //如果主機(jī)A中table的最大ID大于主機(jī)B中table表的最大ID,說明兩個
} 的資料不同

mysql_close($link); //關(guān)閉主機(jī)B的數(shù)據(jù)庫連接


$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; //如果主機(jī)B中的table的最大ID為空(里面沒有資料),那么就等0

$re=mysql_query("select * from table limit $remote_id,$result_id"); //取出主機(jī)A中table表與主機(jī)B中table表里不同的資料
$num=mysql_numrows($re);
if (!empty($num)) {
for ($i=0;$i$test[$i]=mysql_result($re,$i,"test"); //把不同的資料放入一個數(shù)組里
}
}
mysql_close($link); //關(guān)閉主機(jī)A的數(shù)據(jù)庫連接


$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<$i;$j++) { //這里的i等于在比較主機(jī)A與主機(jī)B上table表不同資料的數(shù)量

mysql_query("insert into table (test) values('$test[$j]')");

}

mysql_close($link); //關(guān)閉主機(jī)B的數(shù)據(jù)庫連接

?>

這時就初步實(shí)現(xiàn)了 A 主機(jī)和 B 主機(jī)數(shù)據(jù)的同步,但現(xiàn)在還需要人手動每次去激活這個程序,有沒有辦法把它作為一個腳本一樣的,放在 crontab 里面指定時間自動執(zhí)行呢?

在安裝 php 時會自動生一個叫 php 的可執(zhí)行文件,一般在/你安裝的 php 目錄 /bin 下面,不過較底的版本好像沒有,如果沒有這個文件,你就得升級你的 php 。

#php -q test.php

php 原本是應(yīng)用在網(wǎng)頁應(yīng)用的﹐因此它會送出 HTML 的 Header﹐但是在此我們是要將 php 用作 Shell Script﹐"-q" 就是表示不要送出 Header 的意思.

最后編輯 /etc/crontab 里的文件,加上下面這一句。

0 0 * * * root /home/httpd/html/test //每天晚上零點(diǎn)執(zhí)/home/httpd/html/test文件(具體使用方法請查看cron的相關(guān)資料)

OK,到這里差不多就已完成 Mysql 數(shù)據(jù)的同步了,如果各位還有興趣的話,可以想一個連編輯、刪除都能同步的更好的辦法。

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