wget ftp://ftp.freetds.org/pub/freetds/stable/freetds-stable.tgz tar zxvf freetds-stable.tgz cd freetds-0.91
./configure --with-tdsver=8.0 --enable-msdblib
make sudo make install
4.配置
默认安装的配置文件位于/usr/local/etc，在/usr/local/etc编辑freetds.conf 文件，默认为
# $Id: freetds.conf,v 1.12 2007/12/25 06:02:36 jklowden Exp $
#
# This file is installed by FreeTDS if no file by the same
# name is found in the installation directory.
#
# For information about the layout of this file and its settings,
# see the freetds.conf manpage "man freetds.conf".
# Global settings are overridden by those in a database
# server specific section
[global]
# TDS protocol version
; tds version = 4.2
# Whether to write a TDSDUMP file for diagnostic purposes
# (setting this to /tmp is insecure on a multi-user system)
; dump file = /tmp/freetds.log
; debug flags = 0xffff
# Command and connection timeouts
; timeout = 10
; connect timeout = 10
# If you get out-of-memory errors, it may mean that your client
# is trying to allocate a huge buffer for a TEXT field.
# Try setting 'text size' to a more reasonable limit
text size = 64512
# A typical Sybase server
[egServer50]
host = symachine.domain.com
port = 5000
tds version = 5.0
# A typical Microsoft server
[egServer70]
host = ntmachine.domain.com
port = 1433
tds version = 7.0在文件的最后位置添加如下配置，即可连接SQL Server 2000
[sql-server-2000]
host = 192.168.182.9
port = 1433
tds version = 7.0如果要连接SQL Server 2005或2008，需要添加以下配置
[sql-server-2005]
host = 192.168.70.1
port = 1433
tds version = 8.0/usr/local/bin/tsql -S sql-server-2000 -U sa -P test
如果成功连接，将会出现以下提示
locale is "zh_CN.UTF-8" locale charset is "UTF-8" using default charset "UTF-8" 1>
至此，FreeTDS已经是Linux具备连接SQL Server的功能了。
PHP 5.4之后已经没有原生支持的SQL Server的驱动了，因此需要手动编译PHP源码的扩展添加对SQL Server的驱动支持。CentOS 7自带的是5.4版本的PHP，因此我们通过编译5.4版的PHP源码获得扩展。
目前CentOS yum源里最新的php是5.4.16，php可以通过yum安装到系统
sudo yum install php php-devel php-fpm php-common php-mysql php-pdo libzip
php官网上最新的5.4版本是 5.4.39，下载源码到本地
wget http://cn2.php.net/distributions/php-5.4.39.tar.gz
解压并进入扩展目录
tar zxvf php-5.4.39.tar.gz cd php-5.4.39/ext/mssql
使用phpize生成configure脚本文件
phpize
生成makefile
./configure
编译
make
编译之后将会在modules子目录生成mssql.so扩展文件。复制扩展文件到php的扩展文件目录
sudo cp modules/mssql.so /usr/lib64/php/modules/
在/etc/php.d目录下新建mssql.ini 文件，输入以下内容
; Enable mssql extension module extension=mssql.so
这样PHP就能加载SQL Server驱动了。使用如下代码测试PHP连接SQL Server。
<?php
header("Content-type: text/html; charset=utf-8");
$msdb=mssql_connect("sql-server-2000","sa","test");
if (!$msdb) {
echo "connect sqlserver error";
exit;
}
mssql_select_db("msdb",$msdb);
$result = mssql_query("SELECT top 5 * FROM employee", $msdb);
while($row = mssql_fetch_array($result)) {
var_dump($row);
}
mssql_free_result($result);
?>代码中的数据库配置信息可以替换成别的。测试命令如下
php -f test-mssql.php
成功执行后将会打印出数据库表中记录数据。
目前原生PHP代码已经可以连接SQL Server了，但是Laravel还是不行，还需要再编译生成一个pdo_dblib.so扩展驱动。
cd php-5.4.39/ext/pdo_dblib ./configure make sudo cp modules/pdo_dblib.so /usr/lib64/php/modules/
再到/etc/php.d下新建pdo_dblib.ini，输入以下内容
; Enable pdo_dblib extension module extension=pdo_dblib.so
再编辑Laravel的app/config/database.php文件，将sqlsrv区域改为一下形式
'sqlsrv' => array(
'driver' => 'sqlsrv',
'host' => 'sql-server-2000',
'database' => 'msdb',
'username' => 'sa',
'password' => 'test',
'prefix' => '',
),
这样Laravel也可以连接SQL Server了。
