MemCache 安裝手冊

時間 2020-01-08

原文原文鏈接

MemCache 安裝手冊
wget http://download.tangent.org/libmemcached-0.34.tar.gz
wget http://memcached.googlecode.com/files/memcached-1.4.1.tar.gz
wget http://www.monkey.org/~provos/libevent-1.2.tar.gzphp

一、安裝libevent
tar zxvf libevent-1.2.tar.gz
cd libevent-1.2
./configure -prefix=/usr/libevent
make
make installhtml

二、安裝memcache
tar -zxvf memcached-1.4.1.tar.gz
cd memcached-1.4.1
./configure -with-libevent=/usr/libevent/ -prefix=/usr/local/memcached
make
make installmysql

三、安裝libmemcached

wget http://download.tangent.org/libmemcached-0.34.tar.gz
tar xvzf libmemcached-0.34.tar.gz
cd libmemcached-0.34
./configure --prefix=/usr/local/libmemcached --with-memcached=/usr/local/memcachedlinux

./configure的時候，若是你的Memcached不是默認安裝路徑的話，會報web

configure: error: “could not find memcached binary”sql

錯，以下的相似的命令能夠解決這個問題。json

./configure --prefix=/usr/local/libmemcached --with-memcached=/usr/local/memcached/bin/memcachedubuntu

make
make install
chmod 777 /etc/ld.so.conf
echo "/usr/local/libmemcached" >> /etc/ld.so.conf
ldconfigcentos

四、安裝memcached_functions_mysql
wget http://download.tangent.org/memcached_functions_mysql-0.9.tar.gz
tar zxvf memcached_functions_mysql-0.9.tar.gz
cd memcached_functions_mysql-0.9
./configure --prefix=/usr/local/memcache_mysql --with-mysql=/usr/local/mysql/bin/mysql_config --with-libmemcached=/usr/local/libmemcached緩存

make; make install

cp /usr/local/memcache_mysql/lib/libmemcached_functions* /usr/local/mysql/lib/mysql/plugin
5）添加memcache UDF 函數
mysql> source sql/install_functions.sql

這樣咱們就可使用mysql memcached UDF 了，咱們能夠經過下面語句查看是否已經正常安裝
mysql> select * from mysql.func;

添加trigger，就是向memcache內insert，update，deletel等，參照：
1）memcached_functions_mysql-0.9/sql 目錄下的trigger_fun.sql
2）或者文檔：http://dev.mysql.com/doc/refman/5.1/en/ha-memcached-interfaces-mysqludf.html
若是懶得看就看我後邊的例子
3 測試

/usr/local/memcached/bin/memcached -m 110m -u root -p 11211 -d -P -t 200 /var/run/memcached1.pid

64位會報如下的錯誤：
/usr/local/memcached/bin/memcached: error while loading shared libraries: libevent-1.2.so.1: cannot open shared object file: No such file or directory
解決：ln -s /usr/libevent/lib/libevent-1.2.so.1 /usr/lib64/libevent-1.2.so.1

mysql> select memc_servers_set('127.0.0.1:11211')
注意：若是mysql restart，須要從新運行這句以創建與memcached之間的關係
mysql> select memc_servers_behavior_set('MEMCACHED_BEHAVIOR_NO_BLOCK','1');
+--------------------------------------------------------------+
| memc_servers_behavior_set('MEMCACHED_BEHAVIOR_NO_BLOCK','1') |
+--------------------------------------------------------------+
| 0 |
+--------------------------------------------------------------+
1 row in set (0.00 sec)

注意：設置MEMCACHED_BEHAVIOR_NO_BLOCK爲打開狀態，這樣在memcached出現問題時（不能鏈接時）
數據繼續插入到mysql中，報錯提示，若是不設置此值，若是memcached失敗，mysql須要等到timeout
才能夠插入到表中。
mysql> use test;
Database changed

mysql> create table xxd (id int, value varchar(100));
mysql> create trigger xxdmmci after insert on xxd for each row set @tmp = memc_set(NEW.id, NEW.value);
mysql> create trigger xxdmmcu after update on xxd for each row set @tmp = memc_set(NEW.id, NEW.value);
mysql> create trigger xxdmmcd before delete on xxd for each row set @tmp = memc_delete(OLD.id);
mysql> insert into xxd values(1, 'xxd'),(2,'xxd79'),(3, 'buro79xxd');
Query OK, 3 rows affected (0.00 sec)
Records: 3 Duplicates: 0 Warnings: 0

mysql> select memc_get('2');
+----------------------------+
| memc_get('2')              |
+----------------------------+
| xxd79 |
+----------------------------+
1 row in set (0.00 sec)
mysql> update xxd set value='xxd_new' where id=1;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> select memc_get('1');
+----------------------------+
| memc_get('1')              |
+----------------------------+
| xxd_new |
+----------------------------+
1 row in set (0.00 sec)
mysql> delete from xxd where id=1;
Query OK, 1 row affected (0.00 sec)

mysql> select memc_get('1');
+----------------------------+
| memc_get('1')              |
+----------------------------+
| NULL |
+----------------------------+
1 row in set (0.00 sec)
mysql> exit
$ telnet 127.0.0.1 11211
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
get 1
END
get 2
VALUE 2 0 5
xxd79
END
get 3
VALUE 3 0 9
buro79xxd
END
quit
Connection closed by foreign host.
--EOF--
(1). 下載安裝 lib_mysqludf_json 修改版：

　　如下安裝包適合32位Linux操做系統：

wget http://mysql-udf-http.googlecode.com/files/lib_mysqludf_json-i386.tar.gz
tar zxvf lib_mysqludf_json-i386.tar.gz
cd lib_mysqludf_json-i386/
# 若是你的MySQL安裝路徑不是/usr/local/webserver/mysql/，請修改如下路徑。
cp -f lib_mysqludf_json.so /usr/local/webserver/mysql/lib/mysql/plugin/lib_mysqludf_json.so
cd ../

　　如下安裝包適合64位Linux操做系統：

wget http://mysql-udf-http.googlecode.com/files/lib_mysqludf_json-x86_64.tar.gz
tar zxvf lib_mysqludf_json-x86_64.tar.gz
cd lib_mysqludf_json-x86_64/
# 若是你的MySQL安裝路徑不是/usr/local/webserver/mysql/，請修改如下路徑。
cp -f lib_mysqludf_json.so /usr/local/webserver/mysql/lib/mysql/plugin/lib_mysqludf_json.so
cd ../

　　經過命令行登錄進入MySQL：

/usr/local/webserver/mysql/bin/mysql -S /tmp/mysql.sock

　　mysql>
create function lib_mysqludf_json_info returns string soname 'lib_mysqludf_json.so';
create function json_array returns string soname 'lib_mysqludf_json.so';
create function json_members returns string soname 'lib_mysqludf_json.so';
create function json_object returns string soname 'lib_mysqludf_json.so';
create function json_values returns string soname 'lib_mysqludf_json.so';
create function lib_mysqludf_json_info returns string soname 'lib_mysqludf_json.so';
create function json_array returns string soname 'lib_mysqludf_json.so';
create function json_members returns string soname 'lib_mysqludf_json.so';
create function json_object returns string soname 'lib_mysqludf_json.so';
create function json_values returns string soname 'lib_mysqludf_json.so';　　
lib_mysqludf_json的詳細用法請訪問：http://www.mysqludf.org/lib_mysqludf_json/

(2). 建立測試表

　　mysql>

SET NAMES UTF8;

USE test;

CREATE TABLE IF NOT EXISTS `mytable` (
`id` int(10) NOT NULL AUTO_INCREMENT,
`addtime` int(10) NOT NULL,
`title` varchar(255) CHARACTER SET utf8 NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=1;
SET NAMES UTF8;
USE test;
CREATE TABLE IF NOT EXISTS `mytable` (
`id` int(10) NOT NULL AUTO_INCREMENT,
`addtime` int(10) NOT NULL,
`title` varchar(255) CHARACTER SET utf8 NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=1;
　　(3). 爲測試表建立觸發器：

　　mysql>

/* INSERT插入操做的觸發器 */

DELIMITER |

DROP TRIGGER IF EXISTS mytable_insert;
CREATE TRIGGER mytable_insert
AFTER INSERT ON mytable
FOR EACH ROW BEGIN
SET @tt_json = (SELECT json_object(id,addtime,title) FROM mytable WHERE id = NEW.id LIMIT 1);
SET @tt_resu = (SELECT http_put(CONCAT('http://192.168.8.34:1978/', NEW.id), @tt_json));
END |
DELIMITER ;

/* UPDATE更新操做的觸發器 */
DELIMITER |
DROP TRIGGER IF EXISTS mytable_update;
CREATE TRIGGER mytable_update
AFTER UPDATE ON mytable
FOR EACH ROW BEGIN
SET @tt_json = (SELECT json_object(id,addtime,title) FROM mytable WHERE id = OLD.id LIMIT 1);
SET @tt_resu = (SELECT http_put(CONCAT('http://192.168.8.34:1978/', OLD.id), @tt_json));
END |
DELIMITER ;

/* DELETE刪除操做的觸發器 */
DELIMITER |
DROP TRIGGER IF EXISTS mytable_delete;
CREATE TRIGGER mytable_delete
AFTER DELETE ON mytable
FOR EACH ROW BEGIN
SET @tt_resu = (SELECT http_delete(CONCAT('http://192.168.8.34:1978/', OLD.id)));
END |
DELIMITER ;
/* INSERT插入操做的觸發器 */
DELIMITER |
DROP TRIGGER IF EXISTS mytable_insert;
CREATE TRIGGER mytable_insert
AFTER INSERT ON mytable
FOR EACH ROW BEGIN
    SET @tt_json = (SELECT json_object(id,addtime,title) FROM mytable WHERE id = NEW.id LIMIT 1);
    SET @tt_resu = (SELECT http_put(CONCAT('http://192.168.8.34:1978/', NEW.id), @tt_json));
END |
DELIMITER ;

/* DELETE刪除操做的觸發器 */
DELIMITER |
DROP TRIGGER IF EXISTS mytable_delete;
CREATE TRIGGER mytable_delete
AFTER DELETE ON mytable
FOR EACH ROW BEGIN
SET @tt_resu = (SELECT http_delete(CONCAT('http://192.168.8.34:1978/', OLD.id)));
END |
DELIMITER ;
　　(4). 將 MySQL 表和 Tokyo Tyrant 關聯進行查詢：

　　mysql>
SELECT id,addtime,title,http_get(CONCAT('http://192.168.8.34:1978/',id)) AS tt FROM mytable ORDER BY id DESC LIMIT 0,5;
SELECT id,addtime,title,http_get(CONCAT('http://192.168.8.34:1978/',id)) AS tt FROM mytable ORDER BY id DESC LIMIT 0,5;

--------------------------------------------------------------------------------

　　5. 如何刪除mysql-udf-http UDF函數：

　　mysql>
drop function http_get;
drop function http_post;
drop function http_put;
drop function http_delete;
drop function http_get;
drop function http_post;
drop function http_put;
drop function http_delete;

以上爲詳細安裝！！！

mysql觸發器(trigger)操做memcache .
2011-06-24 14:30 220人閱讀評論(0) 收藏舉報
安裝遇到的問題：

對memcache的操做通常都是放程序裏面去操做的，新增，更新，刪除什麼的。若是能利用mysql來對memcache進行操做，那就更好，代碼端就會簡單一點。可是利用mysql來操做memcache，比較適合實現簡單的方式。下面說一下安裝的過程和遇到的問題，在看安裝過程的以前，我以爲應當先看一下，我安裝時候所遇到的問題，這樣你能夠避免掉，少走一點彎路。

一，安裝所要的軟件

mysql5.1以上版本：http://downloads.mysql.com/archives/

libevent下載：wget http://www.monkey.org/~provos/libevent-1.2.tar.gz

libmemcached下載：http://download.tangent.org/

memcached下載：http://www.danga.com/memcached/

memcached_functions_mysql下載：http://download.tangent.org/

二，mysql的安裝

mysql的安裝方式有不少，你能夠用系統的軟件管理包來安裝，不一樣的linux版本，軟件管理工具是不同的。

redhat,centos 有yum，ubuntu 有apt-get ，arch有pacman等。用系統自帶的管理工具安裝比較簡單。若是是本身下載怎麼安裝的呢，mysql的官方網站提供了三種mysql的安裝源碼，一種是.rpm的，一種是二進制的，一種是要本身編譯的。

1，用rpm來按裝

01.rpm -i MySQL-server-VERSION.i386.rpm
02.rpm -i MySQL-client-VERSION.i386.rpm
2，二進制包進行安裝

二進制包安裝有一個缺點，就是要安裝到什麼地方，都是死的。安裝過程當中有問題的，查看一下是否是裝了glibc,以及版本是否是過低了。

01.groupadd mysql
02.useradd -g mysql mysql
03.tar zxvf /path/to/mysql-VERSION-OS.tar.gz　-C /usr/local
04.cd　/usr/local
05.mv mysql-VERSION-OS ./mysql
06.cd /usr/local/mysql
07.scripts/mysql_install_db        --user=mysql
08.chown -R mysql:mysql /usr/local/mysql
09.bin/mysqld_safe --user=mysql        &
３，源碼本身編譯

01.groupadd mysql
02.useradd -g mysql mysql
03.tar zxvf /path/to/mysql-VERSION-OS.tar.gz
04.cd　/mysql-VERSION-OS
05../configure --prefix=/usr/local/mysql　　//路徑可自定義
06.make && make install
07.cp support-files/my-medium.cnf /etc/my.cnf
08.cd /usr/local/mysql
09.bin/mysql_install_db --user=mysql
10.chown -R mysql:mysql /usr/local/mysql
11.bin/mysqld_safe --user=mysql &
安裝遇難問題：安裝mysql至少要５.1版本以上的，服務器端，仍是客戶端都要，裝完memcached_functions_mysql後，調用libmemcached模塊時會報錯的。

[root@BlackGhost sql]# /usr/local/mysql/bin/mysql <install_functions.sql
ERROR 1126 (HY000) at line 1: Can't open shared library 'libmemcached_functions_mysql.so' (errno: 22 /usr/local/mysql/lib/mysql/plugin/libmemcached_functions_mysql.so: undefined symbol: memcached_string_append)

上面是用mysqld_safe來啓動mysql的，也能夠用mysql.server來啓動，它在/usr/local/mysql/share/mysql 下面，你也能夠把mysql.server考到開機啓動的目錄下面，而且重命名爲mysqld

[root@BlackGhost mysql]# ./mysql.server stop
Shutting down MySQL.. SUCCESS!
[root@BlackGhost mysql]# ./mysql.server start
Starting MySQL. SUCCESS!

二，關於libevent和memcached的安裝

1.deb

Debian 系直接 $ sudo apt-get install memcached 都搞定，否則還須要分別安裝libevent與memcached

2.源碼安裝

wget http://www.monkey.org/~provos/libevent-1.2.tar.gz #下載libevent

1 .查看是否已經安裝了libevent，通常狀況下，裝系統的時候libevent就會裝進去的。
ls -al /usr/lib | grep libevent

[root@BlackGhost etc]# ls -al /usr/lib | grep libevent
lrwxrwxrwx 1 mysql mysql       21 Mar 25 2009 libevent-1.2.so.1 -> libevent-1.2.so.1.0.3
-rwxr-xr-x 1 mysql mysql   208300 Mar 25 2009 libevent-1.2.so.1.0.3
-rw-r--r-- 1 mysql mysql   268992 Mar 25 2009 libevent.a
-rwxr-xr-x 1 mysql mysql      820 Mar 25 2009 libevent.la
lrwxrwxrwx 1 mysql mysql       21 Mar 25 2009 libevent.so -> libevent-1.2.so.1.0.3
若是顯示上面內容說明你已安裝了，就能夠跳過第二步。

2 . 先安裝libevent：

第一種方法
tar zxvf libevent-1.2.tar.gz
cd libevent-1.2
./configure --prefix=/usr
make
make install

第二種方法

用系統自命的軟件管理工具，archlinux用pacman，centos用yum ，大便用apt-get等

[root@BlackGhost etc]# pacman -Ss libevent
core/libevent 1.4.11-1
An event notification library

安裝完後在進行第一步，進行測試

3 . 安裝memcached服務器端：
tar zxvf memcached-1.2.0.tar.gz
cd memcached-1.2.0
./configure --with-libevent=/usr --prefix=/usr/local/memcahced
make
make install
若是有錯，請確認一下，local下面有memcahced這個文件夾，以及libevent的安裝路徑是否正確

4 .啓動memcached服務

/usr/local/bin/memcached -d -m 20 -u zhangy -p 11211 -P ./memcached.pid

-d #做爲守護進程運行

-m#分配20M的內存

-u ＃用戶是zhangy

-p ＃監聽端口是12000

－P＃進程PID存放的位置

[zhangy@BlackGhost ~]$ ps -e|grep memcache
17904 ? 00:00:00 memcached

到此memcached的服務器端已經安裝。

三，libmemcached的安裝

$ wget http://download.tangent.org/libmemcached-0.34.tar.gz
$ tar xvzf libmemcached-0.34.tar.gz
$ cd libmemcached-0.34
$ ./configure --prefix=/usr/local/libmemcached34 --with-memcached=/usr/bin/memcached
$ sudo make
$ sudo make install
$ sudo chmod 777 /etc/ld.so.conf
$ echo "/usr/local/libmemcached34" >> /etc/ld.so.conf
$ ldconfig

注意路徑不要錯了。install_functions.sql定義了一些memcache的操做函數：以下到這兒安裝基本上結束，下面咱們來測試一下

1.當時我下載的是libmemcached-0.42.tar.gz，安裝memcached_functions_mysql過程當中遇到這樣一個問題

servers.c:263:28: error: 'memcached_st' has no member named 'hosts'
servers.c:264:28: error: 'memcached_st' has no member named 'hosts'

後來我在網上查一下，libmemcached-0.34沒有這個問題

2. libmemcached-0.37會遇到 ERROR 1126 (HY000) at line 38: Can't open shared library 'libmemcached_functions_mysql.so' (errno: 0 /usr/local/mysql/lib/plugin/libmemcached_functions_mysql.so: undefined symbol: memcached_string_append)

因此推薦安裝 ibmemcached-0.34。

3.在安裝libmemcached的時候，若是不是默認安裝，須要指定memcached安裝路徑。

四，安裝memcached_functions_mysql

01.tar xzf memcached_functions_mysql-0.9.tar.gz
02.cd memcached_functions_mysql-0.9
03../configure --prefix=/usr/local/memcache_mysql --with-mysql=/usr/local/mysql/bin/mysql_config --with-libmemcached=/usr/local/libmemcached37
04.make && make install
05.cp /usr/local/memcache_mysql/lib/libmemcached_functions*   /usr/local/mysql/lib/mysql/plugin 別忘了加上--with-libmemcached=/usr/local/libmemcached34 否則會報如下錯誤

checking for mysql_config... /usr/bin/mysql_config
checking for libmemcached >= 0.17... configure: error: libmemcached not found

若是是mysql 5.5 mysql插件的目錄是/usr/local/mysql/lib/plugin

建立mysql的memcache操做函數

$ mysql < sql/install_functions.sql

mysql若是不是默認安裝，須要指定路徑。

也能夠在mysql管理裏面運行install_functions.sql的sql腳本。

mysql> source sql/install_functions.sql

添加trigger ，就是向memcache內insert，update，deletel等，參照：
1）memcached_functions_mysql-0.9/sql 目錄下的trigger_fun.sql
2）或者文檔：http://dev.mysql.com/doc/refman/5.1/en/ha-memcached-interfaces-mysqludf.html
若是懶得看就看我後邊的例子

五，測試

例子1：

mysql> select memc_servers_behavior_set('MEMCACHED_BEHAVIOR_TCP_NODELAY','1');
+-----------------------------------------------------------------+
| memc_servers_behavior_set('MEMCACHED_BEHAVIOR_TCP_NODELAY','1') |
+-----------------------------------------------------------------+
| 0 |
+-----------------------------------------------------------------+
1 row in set (0.00 sec)
注意：設置MEMCACHED_BEHAVIOR_NO_BLOCK爲打開狀態，這樣在memcached出現問題時（不能鏈接時）
數據繼續插入到mysql中，報錯提示，若是不設置此值，若是memcached失敗，mysql須要等到timeout
才能夠插入到表中。
mysql> use test;
Database changed

mysql> create table xxd (id int, value varchar(100));
mysql> create trigger xxdmmci after insert on xxd for each row set @tmp = memc_set(NEW.id, NEW.value);
mysql> create trigger xxdmmcu after update on xxd for each row set @tmp = memc_set(NEW.id, NEW.value);
mysql> create trigger xxdmmcd before delete on xxd for each row set @tmp = memc_delete(OLD.id);
mysql> insert into xxd values(1, 'xxd'),(2,'xxd79'),(3, 'buro79xxd');
Query OK, 3 rows affected (0.00 sec)
Records: 3 Duplicates: 0 Warnings: 0

mysql> select memc_get('2');
+----------------------------+
| memc_get('2')              |
+----------------------------+
| xxd79 |
+----------------------------+
1 row in set (0.00 sec)
mysql> update xxd set value='xxd_new' where id=1;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> select memc_get('1');
+----------------------------+
| memc_get('1')              |
+----------------------------+
| xxd_new |
+----------------------------+
1 row in set (0.00 sec)
mysql> delete from xxd where id=1;
Query OK, 1 row affected (0.00 sec)

mysql> select memc_get('1');
+----------------------------+
| memc_get('1')              |
+----------------------------+
| NULL |
+----------------------------+
1 row in set (0.00 sec)
mysql> exit
$ telnet 127.0.0.1 11211
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
get 1
END
get 2
VALUE 2 0 5
xxd79
END
get 3
VALUE 3 0 9
buro79xxd
END
quit
Connection closed by foreign host.

例子2：

01.//建立一個測試有
02.drop table if exists urls;
03.create table urls (
04. id int(3) not null,
05. url varchar(64) not null default   '' ,
06. primary key (id)
07. );
08.
09.//鏈接memcched，根啓動memcahed的端口要同樣
10.select memc_servers_set('127.0.0.1:12000,127.0.0.1:13000' );
11.//設置一個開始序列
12.select memc_set('urls:sequence' , 0);
13.
14.//建立插入memcached觸發器
15.DELIMITER |
16.
17.DROP TRIGGER IF EXISTS url_mem_insert |
18.CREATE TRIGGER url_mem_insert
19.BEFORE INSERT ON urls
20.FOR EACH ROW BEGIN
21. SET NEW.id= memc_increment('urls:sequence' );
22. SET @mm= memc_set(concat('urls:' ,NEW.id), NEW.url);
23.END |
24.
25.//建立更新memcached觸發器
26.DROP TRIGGER IF EXISTS url_mem_update |
27.CREATE TRIGGER url_mem_update
28.BEFORE UPDATE ON urls
29.FOR EACH ROW BEGIN
30. SET @mm= memc_replace(concat('urls:' ,OLD.id), NEW.url);
31.END |
32.
33.//建立刪除memcached觸發器
34.DROP TRIGGER IF EXISTS url_mem_delete |
35.CREATE TRIGGER url_mem_delete
36.BEFORE DELETE ON urls
37.FOR EACH ROW BEGIN
38. SET @mm= memc_delete(concat('urls:' ,OLD.id));
39.END |
40.
41.DELIMITER ; //寫觸發器的時候，咱們會用；mysql執行分割符也是；因此咱們在寫觸發器或者是存儲過程的時候都會改變一下，例如：DELIMITER |
42.
43.//插入一些測試數據
44.insert into urls (url) values ('http://google.com' );
45.insert into urls (url) values ('http://baidu.com/' );
46.insert into urls (url) values ('http://www.51yip.com/' );
47.insert into urls (url) values ('http://blog.51yip.com/' );
48.insert into urls (url) values ('http://51yip.com' );
49.insert into urls (url) values ('http://mysql.com' );
50.select * from urls;
51.
52.//將插入的6條數據顯示出來,下面的顯示和刪除也是同樣的很少說了。
53.select memc_get('urls:1' );
54.select memc_get('urls:2' );
55.select memc_get('urls:3' );
56.select memc_get('urls:4' );
57.select memc_get('urls:5' );
58.select memc_get('urls:6' );
59.
60.update urls set url= 'http://mysql.com/sun' where url = 'http://51yip.com' ;
61.select url from urls where url = 'http://51yip.com/manual' ;
62.select memc_get('urls:6' );
63.
64.delete from urls where url = 'http://blog.51yip.com/' ;
65.select * from urls where url='http://blog.51yip.com/' ;
66.select memc_get('urls:4' );
我之前寫過一篇：關於memcache的key的管理，徘徊中（http://blog.51yip.com/php/729.html）裏面提到對單表進行緩存，能夠徹底配合這篇文章所說的東西。若是有多表聯合查詢的話，在用觸器就比較麻煩了，還不如放到程序裏去執行