Ruby 操作 MongoDB（9）

创建多个索引

代码语言：javascript复制

2.3.0 :056 > db1[:test2].indexes.create_many([{:key => { name: 1 }, :unique => true },{:key => { label: -1 }}])
D, [2016-05-26T23:27:27.426590 #32905] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.createIndexes | STARTED | {"createIndexes"=>"test2", "indexes"=>[{:key=>{:name=>1}, :unique=>true, :name=>"name_1"}, {:key=>{:label=>-1}, :name=>"label_-1"}]}
D, [2016-05-26T23:27:27.479450 #32905] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.createIndexes | SUCCEEDED | 0.052639038s
 => #<Mongo::Operation::Result:7996660 documents=[{"createdCollectionAutomatically"=>true, "numIndexesBefore"=>1, "numIndexesAfter"=>3, "ok"=>1.0}]> 
2.3.0 :057 >

本地查看

代码语言：javascript复制

> show tables
abctest
test2
> db.test2.getIndexes()
[
	{
		"v" : 1,
		"key" : {
			"_id" : 1
		},
		"name" : "_id_",
		"ns" : "post.test2"
	},
	{
		"v" : 1,
		"unique" : true,
		"key" : {
			"name" : 1
		},
		"name" : "name_1",
		"ns" : "post.test2"
	},
	{
		"v" : 1,
		"key" : {
			"label" : -1
		},
		"name" : "label_-1",
		"ns" : "post.test2"
	}
]
>

创建索引过程中还可以加入其它参数，详细参数可以参考 索引参数

查看索引

代码语言：javascript复制

2.3.0 :061 > db1[:test2].indexes.to_a
D, [2016-05-26T23:36:39.171127 #32905] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.listIndexes | STARTED | {"listIndexes"=>"test2", "cursor"=>{}}
D, [2016-05-26T23:36:39.203225 #32905] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.listIndexes | SUCCEEDED | 0.031920452s
 => [{"v"=>1, "key"=>{"_id"=>1}, "name"=>"_id_", "ns"=>"post.test2"}, {"v"=>1, "unique"=>true, "key"=>{"name"=>1}, "name"=>"name_1", "ns"=>"post.test2"}, {"v"=>1, "key"=>{"label"=>-1}, "name"=>"label_-1", "ns"=>"post.test2"}] 
2.3.0 :062 > db1[:test2].indexes.each do |i|
2.3.0 :063 >     p i
2.3.0 :064?>   end
D, [2016-05-26T23:37:24.375182 #32905] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.listIndexes | STARTED | {"listIndexes"=>"test2", "cursor"=>{}}
D, [2016-05-26T23:37:24.377380 #32905] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.listIndexes | SUCCEEDED | 0.00198784s
{"v"=>1, "key"=>{"_id"=>1}, "name"=>"_id_", "ns"=>"post.test2"}
{"v"=>1, "unique"=>true, "key"=>{"name"=>1}, "name"=>"name_1", "ns"=>"post.test2"}
{"v"=>1, "key"=>{"label"=>-1}, "name"=>"label_-1", "ns"=>"post.test2"}
 => #<Enumerator: #<Mongo::Cursor:0x10950640 @view=#<Mongo::Index::View:0x000000014d5a20 @collection=#<Mongo::Collection:0x10923340 namespace=post.test2>, @batch_size=nil>>:each> 
2.3.0 :065 >

删除索引

删除一个索引

代码语言：javascript复制

2.3.0 :078 > db1[:abctest].indexes.to_a
D, [2016-05-26T23:40:04.083421 #32905] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.listIndexes | STARTED | {"listIndexes"=>"abctest", "cursor"=>{}}
D, [2016-05-26T23:40:04.086508 #32905] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.listIndexes | SUCCEEDED | 0.0028248400000000003s
 => [{"v"=>1, "key"=>{"_id"=>1}, "name"=>"_id_", "ns"=>"post.abctest"}, {"v"=>1, "unique"=>true, "key"=>{"name"=>1}, "name"=>"name_1", "ns"=>"post.abctest"}] 
2.3.0 :079 > db1[:abctest].indexes.drop_one('name_1')
D, [2016-05-26T23:40:30.530875 #32905] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.dropIndexes | STARTED | {"dropIndexes"=>"abctest", "index"=>"name_1"}
D, [2016-05-26T23:40:30.563482 #32905] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.dropIndexes | SUCCEEDED | 0.032385475s
 => #<Mongo::Operation::Result:7589800 documents=[{"nIndexesWas"=>2, "ok"=>1.0}]> 
2.3.0 :080 > db1[:abctest].indexes.to_a
D, [2016-05-26T23:40:32.946595 #32905] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.listIndexes | STARTED | {"listIndexes"=>"abctest", "cursor"=>{}}
D, [2016-05-26T23:40:32.950582 #32905] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.listIndexes | SUCCEEDED | 0.0037632599999999996s
 => [{"v"=>1, "key"=>{"_id"=>1}, "name"=>"_id_", "ns"=>"post.abctest"}] 
2.3.0 :081 >

删除所有索引

代码语言：javascript复制

2.3.0 :087 > db1[:test2].indexes.to_a
D, [2016-05-26T23:42:10.912880 #32905] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.listIndexes | STARTED | {"listIndexes"=>"test2", "cursor"=>{}}
D, [2016-05-26T23:42:10.916162 #32905] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.listIndexes | SUCCEEDED | 0.0028684260000000003s
 => [{"v"=>1, "key"=>{"_id"=>1}, "name"=>"_id_", "ns"=>"post.test2"}, {"v"=>1, "unique"=>true, "key"=>{"name"=>1}, "name"=>"name_1", "ns"=>"post.test2"}, {"v"=>1, "key"=>{"label"=>-1}, "name"=>"label_-1", "ns"=>"post.test2"}] 
2.3.0 :088 > db1[:test2].indexes.drop_all
D, [2016-05-26T23:42:19.955254 #32905] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.dropIndexes | STARTED | {"dropIndexes"=>"test2", "index"=>"*"}
D, [2016-05-26T23:42:19.979831 #32905] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.dropIndexes | SUCCEEDED | 0.024125167s
 => #<Mongo::Operation::Result:7885720 documents=[{"nIndexesWas"=>3, "msg"=>"non-_id indexes dropped for collection", "ok"=>1.0}]> 
2.3.0 :089 > db1[:test2].indexes.to_a
D, [2016-05-26T23:42:27.945764 #32905] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.listIndexes | STARTED | {"listIndexes"=>"test2", "cursor"=>{}}
D, [2016-05-26T23:42:27.948694 #32905] DEBUG -- : MONGODB | 192.168.100.105:27017 | post.listIndexes | SUCCEEDED | 0.0026218500000000002s
 => [{"v"=>1, "key"=>{"_id"=>1}, "name"=>"_id_", "ns"=>"post.test2"}] 
2.3.0 :090 >

命令汇总

gem source -l
gem install mongo
gem list | grep mongo
irb

原文地址

grep list 索引

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