Mongodb 与sql 语句对照

mongodb与mysql命令对比

传统的关系数据库一般由数据库（database）、表（table）、记录（record）三个层次概念组成，MongoDB是由数据库（database）、集合（collection）、文档对象（document）三个层次组成。MongoDB对于关系型数据库里的表，但是集合中没有列、行和关系概念，这体现了模式*的特点。

 

MySQL	MongoDB	说明
mysqld	mongod	服务器守护进程
mysql	mongo	客户端工具
mysqldump	mongodump	逻辑备份工具
mysql	mongorestore	逻辑恢复工具
	db.repairDatabase()	修复数据库
mysqldump	mongoexport	数据导出工具
source	mongoimport	数据导入工具
grant * privileges on *.* to …	Db.addUser() Db.auth()	新建用户并权限
show databases	show dbs	显示库列表
Show tables	Show collections	显示表列表
Show slave status	Rs.status	查询主从状态
Create table users(a int, b int)	db.createCollection("mycoll", {capped:true, size:100000}) 另：可隐式创建表。	创建表
Create INDEX idxname ON users(name)	db.users.ensureIndex({name:1})	创建索引
Create INDEX idxname ON users(name,ts DESC)	db.users.ensureIndex({name:1,ts:-1})	创建索引
Insert into users values(1, 1)	db.users.insert({a:1, b:1})	插入记录
Select a, b from users	db.users.find({},{a:1, b:1})	查询表
Select * from users	db.users.find()	查询表
Select * from users where age=33	db.users.find({age:33})	条件查询
Select a, b from users where age=33	db.users.find({age:33},{a:1, b:1})	条件查询
select * from users where age<33	db.users.find({'age':{$lt:33}})	条件查询
select * from users where age>33 and age<=40	db.users.find({'age':{$gt:33,$lte:40}})	条件查询
select * from users where a=1 and b='q'	db.users.find({a:1,b:'q'})	条件查询
select * from users where a=1 or b=2	db.users.find( { $or : [ { a : 1 } , { b : 2 } ] } )	条件查询
select * from users limit 1	db.users.findOne()	条件查询
select * from users where name like "%Joe%"	db.users.find({name:/Joe/})	模糊查询
select * from users where name like "Joe%"	db.users.find({name:/^Joe/})	模糊查询
select count(1) from users	Db.users.count()	获取表记录数
select count(1) from users where age>30	db.users.find({age: {'$gt': 30}}).count()	获取表记录数
select DISTINCT last_name from users	db.users.distinct('last_name')	去掉重复值
select * from users ORDER BY name	db.users.find().sort({name:-1})	排序
select * from users ORDER BY name DESC	db.users.find().sort({name:-1})	排序
EXPLAIN select * from users where z=3	db.users.find({z:3}).explain()	获取存储路径
update users set a=1 where b='q'	db.users.update({b:'q'}, {$set:{a:1}}, false, true)	更新记录
update users set a=a+2 where b='q'	db.users.update({b:'q'}, {$inc:{a:2}}, false, true)	更新记录
delete from users where z="abc"	db.users.remove({z:'abc'})	删除记录
	db. users.remove()	删除所有的记录
drop database IF EXISTS test;	use test db.dropDatabase()	删除数据库
drop table IF EXISTS test;	db.mytable.drop()	删除表/collection
	db.addUser(‘test’, ’test’)	添加用户 readOnly-->false
	db.addUser(‘test’, ’test’, true)	添加用户 readOnly-->true
	db.addUser("test","test222")	更改密码
	db.system.users.remove({user:"test"}) 或者db.removeUser('test')	删除用户

	MongoDB	Mysql
查询全部	movies.find(new Document())	SELECT * FROM movies
条件查询	movies.Find(new Document { { "title", "Hello Esr" } });	SELECT * FROM movies WHERE title= 'foobar'
查询数量	movies.Find(new Document { { "title", "测试2" } }).Documents.Count();	SELECT COUNT(*) FROM movies WHERE `title` = 'foobar'
数量范围查询	1, movies.Find(new Document().Add(" where",newCode("this.num>50")));2,movies.Find(newDocument().Add("num",newDocument().Add("gt",50))); ( gt:>;gte : >= ;  lt:<;lte : <= ;  ne:!=)3,movies.Find("this.num>50");4,movies.Find(newDocument().Add("where",new Code("function(x){ return this.num > 50};")));	select * from movies where num > 50
分页查询	movies.Find(new Document()).Skip(10).Limit(20);	SELECT * FROM movies  limit 10,20
查询排序语句	movies.Find(new Document()).Sort(new Document() { { "num", -1 } });	SELECT * FROM movies ORDER BY num DESC
查询指定字段	movies.Find(new Document().Add("num", new Document().Add("$gt", 50)), 10, 0, new Document() { { "title", 1 } });	select title from movies where num > 50
插入语句	movies.Insert(new Document() { { "title", "测试" }, { "resuleData", DateTime.Now } });	INSERT INOT movies (`title`, `reauleDate`) values ('foobar',25)
删除语句	movies.Remove(new Document() { { "title", "Hello Esr" } });	DELETE * FROM movies
更新语句	movies.Update(new Document() { { "title", "测试2" } }              , new Document() { { "title", "测试11111" } });	UPDATE movies SET `title` = ‘测试1111’ WHERE `title` = '测试1111'
Linq查询	(from item in db.GetCollection("movies").Linq()                        where ((string)item["title"]).StartsWith("Esr")                        select item);	select * from movies where title like ‘%Esr’

转自：http://www.cnblogs.com/yangxia-test/p/3979981.html

http://www.cnblogs.com/cxd4321/archive/2011/05/31/2064843.html