PHP数据库连接池SQL Relay安装使用

SQL Relay按照其官网http://sqlrelay.sourceforge.net/index.html上所说是：A powerful database connection management solution.

翻译为中文也就是说SQL Relay是一个开源的数据库池连接代理服务器。

目前SQL Relay支持的数据库很多：

SQL Relay supports Oracle, MySQL, PostgreSQL, SAP/Sybase, IBM DB2, Informix, Firebird and SQLite databases directly, using the native client API's for those databases.
Support is provided for Microsoft SQL Server via the FreeTDS API.

支持的API也是非常丰富的

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本人讲述怎么在Linux+PHP+FreeDTS环境使用连接池，其实PHP->SQL Relay->FreeDTS->数据库 这样的架构。

下面说安装使用

1.先安装rudiments

建议尽量安装新版，旧版可能会报错需要解决。

# wget http://sourceforge.net/projects/rudiments/files/rudiments/0.28.2/rudiments-0.28.2.tar.gz/download
# tar xvzf rudiments-0.54.tar.gz
# cd rudiments-0.54
# ./configure --prefix=/usr/local/rudiments
# make && make install

2.再安装sqlrelay

# wget https://sourceforge.net/projects/sqlrelay/files/sqlrelay/0.64/sqlrelay-0.64.tar.gz/download
# tar vxzf sqlrelay-0.64.tar.gz
# cd sqlrelay-0.64
# ./configure --prefix=/usr/local/sqlrelay --with-rudiments-prefix=/usr/local/rudiments  --with-freetds-prefix=/usr/local/freetds --with-php-prefix=/usr/local/php

# make && make install

3.修改php配置文件

# vim /usr/local/php/lib/php.ini
增加扩展

extension ="sql_relay.so"

4.修改freeDTS配置

关于freeDTS的安装参考此文：http://blog.csdn.net/unix21/article/details/47449901

修改FreeTDS的配置文件freetds.conf
# vim /usr/local/freetds/etc/freetds.conf

加入以下内容

[msdetest]
host = 192.168.1.1
port =1433
tds version = 7.0
client charset = UTF-8

5.修改SQL Relay的配置文件

# cd /usr/local/sqlrelay/etc/
# cp sqlrelay.conf.example  sqlrelay.conf
# vim sqlrelay.conf

整个配置非常好理解

<?xml version="1.0"?>
<!DOCTYPE instances SYSTEM "sqlrelay.dtd">
<instances>
<instance id="msdetest" port="9001" socket="/tmp/msdetest.socket" dbase="freetds" connections="10" maxconnections="50" maxqueuelength="0" growby="1" ttl="60" endofsession="commit" sessiontimeout="5" runasuser="nobody" runasgroup="nobody" cursors="5" authtier="listener" handoff="pass">
<users>
<user user="admin" password="admin"/>
</users>
<connections>
<connection connectionid="msdetest" string="server=msde;db=test;user=admin;password=admin;" metric="1"/>
</connections>
</instance>
</instances>

# export PATH=$PATH:/usr/local/sqlrelay/bin
启动：

# sqlr-start -id msde

上图是成功启动，如果配置错误会提示数据库连不上之类的。

SQL工具

# sqlrsh -id msde

7.php使用连接池

<?php
$con=sqlrcon_alloc("msdetest",9001,"/tmp/msdetest.socket","admin","admin",0,1);
$cur=sqlrcur_alloc($con);
sqlrcur_sendQuery($cur,"SELECT top 10 * FROM test order by id desc");
for ($row=0; $row<sqlrcur_rowCount($cur); $row++) {
for ($col=0; $col<sqlrcur_colCount($cur); $col++) {
echo sqlrcur_getField($cur,$row,$col);
echo ",";
}
echo "<br>\n";
}
sqlrcur_free($cur);
sqlrcon_free($con);
?>

SQL Relay的PHP函数API

http://sqlrelay.sourceforge.net/sqlrelay/programming/php.html

使用了连接池之后从数据库那边可以看出连接池是保持连接的，我们设定的最小连接池是10个。

参考：http://www.cnblogs.com/zhangjun516/archive/2013/03/12/2955162.html