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Mongodb对应sql操作


Mongodb对应sql操作
 
SQL Statement 
Mongo Statement 
CREATE TABLE USERS (a Number, b Number) 
implicit; can also be done explicitly with 
db.createCollection("mycoll") 
ALTER TABLE users ADD ... 
implicit 
 
INSERT INTO USERS VALUES(3,5) 
db.users.insert({a:3,b:5}) 
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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:{$gt:33}}) 
SELECT * FROM users WHERE age!=33 
db.users.find({age:{$ne:33}}) 
SELECT * FROM users WHERE name LIKE "%Joe%" 
db.users.find({name:/Joe/}) 
SELECT * FROM users WHERE name LIKE "Joe%" 
db.users.find({name:/^Joe/}) 
SELECT * FROM users WHERE age>33 AND age<=40 
db.users.find({'age':{$gt:33,$lte:40}}) 
SELECT * FROM users ORDER BY name DESC 
db.users.find().sort({name:-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() 
SELECT order_id FROM orders o, order_line_items li WHERE li.order_id=o.order_id AND li.sku=12345   www.zzzyk.com  
db.orders.find({"items.sku":12345},{_id:1}) 
SELECT customer.name FROM customers,orders WHERE orders.id="q179" AND orders.custid=customer.id 
var o = db.orders.findOne({_id:"q179"}); 
var name = db.customers.findOne({_id:o.custid}) 
 
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() 
 
CREATE INDEX myindexname ON users(name) 
db.users.ensureIndex({name:1}) 
CREATE INDEX myindexname ON users(name,ts DESC) 
db.users.ensureIndex({name:1,ts:-1}) 
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EXPLAIN SELECT * FROM users WHERE z=3 
db.users.find({z:3}).explain() 
 
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'}); 
 
 
 
作者 chenshengzun
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