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mongodb与SQL对应关系表

2015-08-17 15:03 621 查看

1. select查询

mongodb使用find要么findOne要查询:

find批量查询。

findOne查询记录。

find有两个参数： 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(

{ },

{ user_id:1,status:1
}

)

SELECT user_id,status

FROM users

db.users.find(

{ },

{ user_id:1,status:1,_id:0
}

)

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" },

{ user_id:1,status:1,_id:0
}

)

SELECT *

FROM users

WHERE status!="A"

db.users.find(

{ status: {$ne:"A"
} }

)

SELECT *

FROM users

WHERE status="A"

AND age=50

db.users.find(

{ status:"A",

age:50 }

)

SELECT *

FROM users

WHERE status="A"

OR age=50

db.users.find(

{ $or: [ {status:"A"
} ,

{ age:50 } ] }

)

SELECT *

FROM users

WHERE age>25

db.users.find(

{ age: {$gt:25
} }

)

SELECT *

FROM users

WHERE age<25

db.users.find(

{ age: {$lt:25
} }

)

SELECT *

FROM users

WHERE age>25

AND age<=50

db.users.find(

{ age: {$gt:25,$lte:50
} }

)

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:1 } )

SELECT *

FROM users

WHERE status="A"

ORDER BY user_id DESC

db.users.find( {status:"A"
} ).sort( {user_id:-1 } )

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

WHERE age>30

db.users.count( {age: {$gt:30
} } )

or

db.users.find( {age: {$gt:30
} } ).count()

SELECT DISTINCT(status)

FROM users

db.users.distinct("status" )

SELECT *

FROM users

LIMIT 1

db.users.findOne()

or

db.users.find().limit(1)

SELECT *

FROM users

LIMIT 5

SKIP10

db.users.find().limit(5).skip(10)

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",

45,

"A")

db.users.insert(

{user_id:"bcd001",age:45,status:"A"}

)

3. update更新

SQL Update Statements

MongoDB update() Statements

UPDATE users

SET status="C"

WHERE age>25

db.users.update(

{ age: {
$gt:25 } },

{ $set: {
status:"C" } },

{ multi:true }

)

UPDATE users

SET age=age+3

WHERE status="A"

db.users.update(

{ status:"A" } ,

{ $inc: {
age:3 } },

{ 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({})

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