不同版本 MongoDB 和 不同版本 Ruby
下面这张表是在不同版本 Ruby 语言，不同版本的 MongoDB 中此 Ruby Driver (mongo 2.2.5) 是否兼容的列表
Ruby Version | 2.4.x | 2.6.x | 3.0.x |
|---|---|---|---|
MRI 1.8.x | No | No | No |
MRI 1.9.x | Yes | Yes | Yes |
MRI 2.0.x | Yes | Yes | Yes |
MRI 2.1.x | Yes | Yes | Yes |
MRI 2.2.x | Yes | Yes | Yes |
JRuby 1.7.x | Yes | Yes | Yes |
Note: 之所以这么强调兼容性，是要尽量在生产中避免由于兼容产生的隐患，自己写的小工具出现问题还可以随便改换过来，但是生产环境下，不是那么容易获得系统停机窗口的，并且不同版本之间的小差异可能产生调用的失败，在大量代码已经完成的情况下，再次改写是很疼的，所以前期的规划很重要，尽量减少这些潜在隐患发生的可能
连接数据库
可以使用两种方式连接 mongo
代码语言：javascript复制[root@h102 mysql]# irb
2.3.0 :001 > require 'mongo'
=> true
2.3.0 :002 > c = Mongo::Client.new(['192.168.100.105:27017'],:database => 'post')
D, [2016-05-25T22:11:05.617907 #36607] DEBUG -- : MONGODB | Adding 192.168.100.105:27017 to the cluster.
=> #<Mongo::Client:0x22859300 cluster=192.168.100.105:27017>
2.3.0 :003 > c1 = Mongo::Client.new('mongodb://192.168.100.105:27017/post')
D, [2016-05-25T22:11:13.529810 #36607] DEBUG -- : MONGODB | Adding 192.168.100.105:27017 to the cluster.
=> #<Mongo::Client:0x26735480 cluster=192.168.100.105:27017>
2.3.0 :004 > c.inspect
=> "#<Mongo::Client:0x22859300 cluster=192.168.100.105:27017>"
2.3.0 :005 > c1.inspect
=> "#<Mongo::Client:0x26735480 cluster=192.168.100.105:27017>"
2.3.0 :006 > c.itself
=> #<Mongo::Client:0x22859300 cluster=192.168.100.105:27017>
2.3.0 :007 > c1.itself
=> #<Mongo::Client:0x26735480 cluster=192.168.100.105:27017>
2.3.0 :008 >
2.3.0 :009 > c.class
=> Mongo::Client
2.3.0 :010 > c1.class
=> Mongo::Client
2.3.0 :011 >Tip: 创建连接的过程中可以添加很多其它的选项，以修改初始化连接的特性，详细可以参考 Client Options 和 Ruby Options 还有 Details on timeout options
插入数据
插入一条数据
代码语言：javascript复制2.3.0 :025 > r = c[:abctest].insert_one({name: 'justfortest'})
D, [2016-05-25T22:23:11.090176 #36607] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.insert | STARTED | {"insert"=>"abctest", "documents"=>[{:name=>"justfortest", :_id=>BSON::ObjectId('5745b54ff677048eff545bc5')}], "ordered"=>true}
D, [2016-05-25T22:23:11.095860 #36607] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.insert | SUCCEEDED | 0.005496831s
=> #<Mongo::Operation::Result:26962180 documents=[{"ok"=>1, "n"=>1}]>
2.3.0 :026 > r.n
=> 1
2.3.0 :027 > r.class
=> Mongo::Operation::Write::Insert::Result
2.3.0 :028 >查看插入结果的反馈
代码语言：javascript复制2.3.0 :040 > r.ok?
=> true
2.3.0 :041 > r.one?
=> true
2.3.0 :042 > r.display
#<Mongo::Operation::Write::Insert::Result:0x0000000336d208> => nil
2.3.0 :043 > r.inspect
=> "#<Mongo::Operation::Result:26962180 documents=[{"ok"=>1, "n"=>1}]>"
2.3.0 :044 > 插入多条数据
代码语言：javascript复制2.3.0 :063 > r = c[:abctest].insert_many([{:name => 'abc'},{:name => 'def' },{:name => 'ghi' },{:name => 'jkl'}])
D, [2016-05-25T22:30:43.872507 #36607] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.insert | STARTED | {"insert"=>"abctest", "documents"=>[{:name=>"abc", :_id=>BSON::ObjectId('5745b713f677048eff545bca')}, {:name=>"def", :_id=>BSON::ObjectId('5745b713f677048eff545bcb')}, {:name=>"ghi", :_id=>BSON::ObjectId('5745b713f677048eff545bcc')}, {:name=>"jkl", :_...
D, [2016-05-25T22:30:43.886054 #36607] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.insert | SUCCEEDED | 0.01328074s
=> #<Mongo::BulkWrite::Result:0x000000033b0058 @results={"n_inserted"=>4, "n"=>4, "inserted_ids"=>[BSON::ObjectId('5745b713f677048eff545bca'), BSON::ObjectId('5745b713f677048eff545bcb'), BSON::ObjectId('5745b713f677048eff545bcc'), BSON::ObjectId('5745b713f677048eff545bcd')]}>
2.3.0 :064 > r.inspect
=> "#<Mongo::BulkWrite::Result:0x000000033b0058 @results={"n_inserted"=>4, "n"=>4, "inserted_ids"=>[BSON::ObjectId('5745b713f677048eff545bca'), BSON::ObjectId('5745b713f677048eff545bcb'), BSON::ObjectId('5745b713f677048eff545bcc'), BSON::ObjectId('5745b713f677048eff545bcd')]}>"
2.3.0 :065 > r.class
=> Mongo::BulkWrite::Result
2.3.0 :066 > 代码语言：javascript复制Tip: 根据文档中的
.n其实已经没有了，如果调用会出现如下报错
2.3.0 :077 > r.n
NoMethodError: undefined method `n' for #<Mongo::BulkWrite::Result:0x000000033b0058>
from (irb):77
from /usr/local/rvm/rubies/ruby-2.3.0/bin/irb:11:in `<main>'
2.3.0 :078 > 查询数据
代码语言：javascript复制[root@h102 ~]# irb
2.3.0 :001 > require 'mongo'
=> true
2.3.0 :002 > c = Mongo::Client.new(['192.168.100.105:27017'],:database => 'post')
D, [2016-05-26T11:53:51.447336 #5174] DEBUG -- : MONGODB | Adding 192.168.100.105:27017 to the cluster.
=> #<Mongo::Client:0x9375760 cluster=192.168.100.105:27017>
2.3.0 :003 > c[:abctest].find(:name => 'abc').each do |x|
2.3.0 :004 > puts x.class, x["_id"],x["name"]
2.3.0 :005?> end
D, [2016-05-26T11:54:18.273709 #5174] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.find | STARTED | {"find"=>"abctest", "filter"=>{"name"=>"abc"}}
D, [2016-05-26T11:54:18.280939 #5174] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.find | SUCCEEDED | 0.006918876s
BSON::Document
5745b6aaf677048eff545bc6
abc
BSON::Document
5745b713f677048eff545bca
abc
=> #<Enumerator: #<Mongo::Cursor:0x13268780 @view=#<Mongo::Collection::View:0x9305440 namespace='post.abctest' @filter={"name"=>"abc"} @options={}>>:each>
2.3.0 :006 >
