SQL 到 MongoDB 映射

CREATE TABLE JavaTpoint (
    id MEDIUMINT NOT NULL
        AUTO_INCREMENT,
    user_id Varchar(20),
    age Number,
    status char(1),
    PRIMARY KEY (id)
)

db.createCollection ( " JavaTpoint " )

ALTER TABLE JavaTpoint ADD join_date DATETIME

db.JavaTpoint.updateMany(
    { },
    { $set: { join_date: new Date() } }
)

ALTER TABLE JavaTpoint DROP COLUMN join_date

db.JavaTpoint.updateMany(
    { },
    { $unset: { "join_date": "" } }
)

CREATE INDEX idx_user_id_asc ON JavaTpoint ( user_id )

db.people.createIndex ( { user_id: 1 } )

CREATE INDEX idx_user_id_asc ON people (user_id)

db.people.createIndex( { user_id: 123, age: 1} )

DROP TABLE people

db.people.drop ()

INSERT INTO JavaTpoint (user_id,
                  age,
                  status)
VALUES ("mongo",
        45,
        "A")

db.JavaTpoint.insertOne(
   { user_id: "mongo", age: 18, status: "A" }
)

SELECT *
FROM JavaTpoint

db.JavaTpoint.find()

SELECT id, user_id, status FROM JavaTpoint

db.JavaTpoint.find( { }, { user_id: 1, status: 1 } )

SELECT user_id, status FROM JavaTpoint

db.JavaTpoint.find( { }, { user_id: 1, status: 1, _id: 0 } )

SELECT * FROM JavaTpoint WHERE status = "B"

db.JavaTpoint.find( { status: "A" } )

SELECT user_id, status FROM JavaTpoint WHERE status = "A"

db.javaTpoint.find( { status: "A" }, { user_id: 1, status: 1, _id: 0 } )

SELECT * FROM JavaTpoint WHERE status != "A"

db.JavaTpoint.find( { status: { $ne: "A" } } )

SELECT *
FROM JavaTpoint
WHERE status = "A"
AND age = 50

db.JavaTpoint.find(
    { status: "A",
      age: 50 }
)

SELECT *
FROM JavaTpoint
WHERE status = "A"
OR age = 50

db.JavaTpoint.find(
    { $or: [ { status: "A" } , { age: 50 } ] }
)

SELECT *
FROM JavaTpoint
WHERE age > 25

db.JavaTpoint.find(
    { age: { $gt: 25 } }
)

SELECT *
FROM JavaTpoint
WHERE age < 25

Db.JavaTpoint.find(
   { age: { $lt: 25 } }
)

SELECT *
FROM JavaTpoint
WHERE age > 25
AND   age <= 50

db.JavaTpoint.find(
   { age: { $gt: 25, $lte: 50 } }
)

SELECT *
FROM JavaTpoint
WHERE user_id like "%bc%"

db.JavaTpoint.find( { user_id: /bc/ } )
-or-

db.JavaTpoint.find( { user_id: { $regex: /bc/ } } )

SELECT *
FROM JavaTpoint
WHERE user_id like "bc%"

db.JavaTpoint.find( { user_id: /^bc/ } )
-or-

db.JavaTpoint.find( { user_id: { $regex: /^bc/ } } )

SELECT *
FROM JavaTPoint
WHERE status = "A"
ORDER BY user_id ASC

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

SELECT *
FROM JavaTPoint
WHERE status = "A"
ORDER BY user_id ASC

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

SELECT *
FROM JavaTPoint
WHERE status = "A"
ORDER BY user_id ASC

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

SELECT *
FROM JavaTPoint
WHERE status = "A"
ORDER BY user_id DESC

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

SELECT *
FROM JavaTPoint
WHERE status = "A"
ORDER BY user_id DESC

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

SELECT COUNT(*)
FROM JavaTPoint

db. JavaTPoint. count()
or

db. JavaTPoint. find(). count()

SELECT COUNT(user_id)
FROM JavaTPoint

db. JavaTPoint.count( { user_id: { $exists: true } } )
or

db. JavaTPoint.find( { user_id: { $exists: true } } ).count()

SELECT COUNT(*)
FROM JavaTPoint
WHERE age > 30

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

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

SELECT DISTINCT(status)
FROM JavaTPoint

db. JavaTPoint.aggregate( [ { $group : { _id : "$status" } } ] )
or, for distinct value sets that do not exceed the BSON size limit

db. JavaTPoint.distinct( "status" )

SELECT *
FROM JavaTPoint
LIMIT 1

db. JavaTPoint.findOne()
or

db. JavaTPoint.find(). limit(1)

SELECT *
FROM JavaTPoint
LIMIT 5
SKIP 10

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

EXPLAIN SELECT *
FROM JavaTPoint WHERE status = "A"

db. JavaTPoint. find( { status: "A" } ). explain()

UPDATE JavaTpoint SET status = "C"
WHERE age > 25

db.JavaTpoint.updateMany( { age: { $gt: 25 } }, { $set: { status: "C" } } )

UPDATE JavaTpoint SET age = age + 3
WHERE status = "A"

db.JavaTpoint.updateMany( { status: "A" } , { $inc: { age: 3 } } )

DELETE FROM JavaTpoint WHERE status = "D"

db.JavaTpoint.deleteMany( { status: "D" } )

DELETE FROM JavaTpoint

db.JavaTpoint.deleteMany( { } )