mongodb与SQL相应关系表

1. select查询

mongodb使用find或者findOne来查询:

find批量查询。

findOne是查询一条记录。

find有两个參数： 第一个查询条件， 第二个查询返回的字段。

以下是mongodb与sql查询的相应关系表：

SQL SELECT Statements	MongoDB find() Statements
SELECT * FROM users	db.users.find()
SELECT id, user_id, status FROM users	db.users.find( { }, } )
SELECT user_id,status FROM users	db.users.find( { }, } )
SELECT * FROM users WHERE status="A"	db.users.find( { status:"A" } )
SELECT user_id,status FROM users WHERE status="A"	db.users.find( { status:"A" }, } )
SELECT * FROM users WHERE status!="A"	db.users.find( { status: {$ne:"A" } } )
SELECT * FROM users WHERE status="A"	db.users.find( { status:"A", } )
SELECT * FROM users WHERE status="A"	db.users.find( { $or: [ {status:"A" } , } ] } )
SELECT * FROM users	db.users.find( } } )
SELECT * FROM users	db.users.find( } } )
SELECT * FROM users	db.users.find( } } )
SELECT * FROM users WHERE user_id like "%bc%"	db.users.find( {user_id:/bc/ } )
SELECT * FROM users WHERE user_id like "bc%"	db.users.find( {user_id:/^bc/ } )
SELECT * FROM users WHERE status="A" ORDER BY user_id ASC	db.users.find( {status:"A" } ).sort( {user_id } )
SELECT * FROM users WHERE status="A" ORDER BY user_id DESC	db.users.find( {status:"A" } ).sort( {user_id } )
SELECT COUNT(*) FROM users	db.users.count() or db.users.find().count()
SELECT COUNT(user_id) FROM users	db.users.count( {user_id: {$exists:true } } ) or db.users.find( {user_id: {$exists:true } } ).count()
SELECT COUNT(*) FROM users	} } ) or } } ).count()
SELECT DISTINCT(status) FROM users	db.users.distinct("status" )
SELECT * FROM users	db.users.findOne() or )
SELECT * FROM users	)
EXPLAIN SELECT  * FROM users WHERE status="A"	db.users.find( {status:"A" } ).explain()

2. insert插入

SQL INSERT Statements	MongoDB insert() Statements
INSERT  INTO  users(user_id, age, status) VALUES  ("bcd001", , "A")	db.users.insert( ,status:"A"} )

3. update更新

SQL Update Statements	MongoDB update() Statements
UPDATE users   SET  status="C"	db.users.update( { age: { $gt } }, { $set: { status:"C" } }, { multi:true } )
UPDATE  users   WHERE  status="A"	db.users.update( { status:"A" } , { $inc: { age } }, { multi:true } )

4. delete 删除

SQL Delete Statements	MongoDB remove() Statements
DELETE  FROM  users   WHERE  status="D"	db.users.remove( { status:"D" } )
DELETE  FROM  users	db.users.remove({})

地址：http://blog.csdn.net/yonggang7/article/details/26067059