编译安装MongoDB
一、安装PCRE库PCRE(Perl Compatible Regular Expressions)，提供高速的正则表达式匹配api。
yum install pcre-devel
或者到ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/下载合适的pcre源码包，然后configure/make/make install
二、安装Spider Monkey库
SpiderMonkey是JavaScript的C实现，可以提供JavaScript的代码解释功能。
到ftp://ftp.mozilla.org/pub/mozilla.org/js/下载js压缩包，解压后进入src目录，并按照如下步骤进行编译安装：
export CFLAGS=”-DJS_C_STRINGS_ARE_UTF8″
make -f Makefile.ref
JS_DIST=/usr make -f Makefile.ref export
三、安装SCons
Scons是一个Python写的自动化构建工具，比传统的GNU make更加简便、可靠以及高效。
到http://sourceforge.net/projects/scons/files/scons/下载源码压缩包，解压之后按照如下步骤进行安装：
python setup.py install
四、安装MongoDB
先到http://www.mongodb.org/downloads/下载想要的MongoDB版本。建议下载1.6以上，有很多架构和功能方面的改进。
解压缩之后按照如下步骤进行安装：
scons all
scons –prefix=/usr/local/mongodb install
如果想要头文件和lib包，执行
scons –prefix=/usr/local/mongodb –full install
五，让MongoDB跑起来
虽然MongoDB支持在命令行里面添加所有参数，但是为了管理方便，还是应该添加一个配置文件的。然后在命令行里面指定配置文件的位置。
下面是一个简单的配置文件：
vim /usr/local/mongodb/config/mongodb
#Directory and>
dbpath = /usr/local/mongodb/data
logpath = /usr/local/mongodb/log/mongodb.log
repairpath = /usr/local/mongodb/repair
pidfilepath = /usr/local/mongodb/mongodb.pid
directoryperdb = true
#sysinfo = true
#verbose = true
logappend = true
#cpu = true
#Network and security set
noauth = true
port = 8888
maxConns = 1024
fork = true
#Management
#nohttpinterface = true
rest = true
quota = true
quotaFiles = 1024
nssize = 16
#syncdelay = 5
值得注意的是，类似 nohttpinterface = false 的配置是无效的。因为这些选项默认为false，不需要配置。
运行MongDB：
mongod –config /usr/local/mongodb/config/mongodb
启动脚本 mongodb-start.sh
#!/bin/sh
/usr/local/mongodb/bin/mongod --config /usr/local/mongodb/config/mongodb ## --upgrade \ ##runs a database upgrade option if needed \
关闭脚本 mongodb-stop.sh
#!/bin/bash
pid=`ps -o pid,command ax | grep mongod | awk '!/awk/ && !/grep/ {print $1}'`;
if [ "${pid}" != "" ]; then
kill -2 ${pid};
fi
六，做服务
启动脚本init-rpm.sh
#! /bin/sh
#
# mongodb – this script starts and stops the mongodb daemon
#
# chkconfig: - 85 15
# description: MongoDB is a non-relational database storage system.
# processname: mongodb
# config: /opt/config/mongodb
# pidfile: /opt/mongodb/mongo.pid
PATH=/opt/mongodb/bin:/sbin:/bin:/usr/sbin:/usr/bin
NAME=mongodb
test -x $DAEMON || exit 0
set -e
case "$1" in
start)
echo -n "Starting MongoDB... "
su - mongodb -c "/opt/bin/mongodb-start"
;;
stop)
echo -n "Stopping MongoDB"
/opt/bin/mongodb-stop
;;
*)
N=/etc/init.d/$NAME
echo "Usage: $N {start|stop}" >&2
exit 1
;;
esac
exit 0
把以上启动脚本做成服务
#mv init-rpm.sh /etc/init.d/mongodb
#chmod +x /etc/init.d/mongodb
#chkconfig --add mongodb
#chkconfig -–level 345 mongodb on
MongoDB与sql语句对照表
SQL Statement
Mongo Query Language Statement
CREATE TABLE USERS (a Number, b Number)
implicit; can be done explicitly
INSERT INTO USERS VALUES(1,1)
db.users.insert({a:1,b:1})
SELECT a,b FROM users
db.users.find({}, {a:1,b:1})
SELECT * FROM users
db.users.find()
SELECT * FROM users WHERE age=33
db.users.find({age:33})
SELECT a,b FROM users WHERE age=33
db.users.find({age:33}, {a:1,b:1})
SELECT * FROM users WHERE age=33 ORDER BY name
db.users.find({age:33}).sort({name:1})
SELECT * FROM users WHERE age>33
db.users.find({'age':{$gt:33}})})
SELECT * FROM users WHERE age33 AND age
db.users.ensureIndex({name:1})
CREATE INDEX>
db.users.ensureIndex({name:1,ts:-1})
SELECT * FROM users WHERE a=1 and b='q'
db.users.find({a:1,b:'q'})
SELECT * FROM users LIMIT 10 SKIP 20
db.users.find().limit(10).skip(20)
SELECT * FROM users WHERE a=1 or b=2
db.users.find( { $or : [ { a : 1 } , { b : 2 } ] } )
SELECT * FROM users LIMIT 1
db.users.findOne()
EXPLAIN SELECT * FROM users WHERE z=3
db.users.find({z:3}).explain()
SELECT DISTINCT last_name FROM users
db.users.distinct('last_name')
SELECT COUNT(*y) FROM users
db.users.count()
SELECT COUNT(*y) FROM users where AGE > 30
db.users.find({age: {'$gt': 30}}).count()
SELECT COUNT(AGE) from users
db.users.find({age: {'$exists': true}}).count()
UPDATE users SET a=1 WHERE b='q'
db.users.update({b:'q'}, {$set:{a:1}}, false, true)
UPDATE users SET a=a+2 WHERE b='q'
db.users.update({b:'q'}, {$inc:{a:2}}, false, true)
DELETE FROM users WHERE z="abc"
db.users.remove({z:'abc'});
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