The connection of MongoDB under Mac

There's not so much chicken soup. Start connecting.

See a quick start MongoDB tutorial on the Internet, post an address and make a note.

One: connect

In the previous section, we installed ManogoDB. If you have successfully installed it, then open a new terminal and enter the following instructions to connect.

Mongo

As shown below, good, you have succeeded ~ you can operate on the command line.

MongoDB shell version: 3.2.8

Connecting to: test

Welcome to the MongoDB shell.

For interactive help, type "help".

For more comprehensive documentation, see

Http://docs.mongodb.org/

Questions? Try the support group

Http://groups.google.com/group/mongodb-user

Server has startup warnings:

2016-08-02T19:16:07.239+0800 I CONTROL [initandlisten]

2016-08-02T19:16:07.239+0800 I CONTROL [initandlisten] * * WARNING: soft rlimits too low. Number of files is 256, should be at least 1000

>

>

>

If you do not install mongodb successfully, you may make the following error.

MongoDB shell version: 3.2.8

Connecting to: test

2016-08-02T18:14:33.677+0800 W NETWORK [thread1] Failed to connect to 127.0.0.1 thread1 27017, reason: errno:61 Connection refused

2016-08-02T18:14:33.678+0800 E QUERY [thread1] Error: couldn't connect to server 127.0.0.1 purl 27017, connection attempt failed:

Connect@src/mongo/shell/mongo.js:229:14

@ (connect): 1:6

Exception: connect failed

So, if it fails, refer to the previous section ~ under installation ~

Two: add, delete, modify and check

1: database

(1) query existing databases

Show dbs

For the first installation, a database like the following appears

Local 0.000GB

(2) install the database

Use database name (e.g. test)

If there is a database with the same name, switch to the existing one, and if not, a new one will be created.

Switched to db test

2: collection

(1) create a collection

Db.createCollection ("Collection name: such as (mycollection)")

Results:

{"ok": 1}

(2) View the collection

Show collections

Results:

Mycollection (the name of the collection created)

3: add: insert (take collection mycollection as an example)

Db.mycollection.insert ({name: "liujinhuan"})

Results:

WriteResult ({"nInserted": 1})

4: check: find (take collection mycollection as an example)

Db.mycollection.find () .pretty ()

Results:

{"_ id": ObjectId ("57a0871725ae4f21a42b44e3"), "name": "liujinhuan"}

5: change: update (take collection mycollection as an example). Change name to TTTTTT if it is liujinhuan

Db.mycollection.update ({'name':'liujinhuan'}, {$set: {' name':'TTTTTT'}})

Results:

WriteResult ({"nMatched": 1, "nUpserted": 0, "nModified": 1})

6: delete: remove (take collection mycollection as an example)

Db.mycollection.remove ({"name": "liujinhuan"})

Results:

WriteResult ({"nRemoved": 1})

Three: visual operation tools

The above operations are all performed by inputting instructions in the terminal ~ recommend a visual operation tool Robomongo~

It's too late ~ tomorrow's physical examination ~ go to bed early ~