mongodb - 如何列出 MongoDB shell 中的所有集合？

Question

在 MongoDB shell 中，如何列出我正在使用的当前数据库的所有集合？

score 1265 · Accepted Answer

你可以做...

JavaScript（外壳）：

db.getCollectionNames()

节点.js：

db.listCollections()

非 JavaScript（仅限 shell）：

show collections

我称之为非 JavaScript 的原因是：

$ mongo prodmongo/app --eval "show collections"
MongoDB shell version: 3.2.10
connecting to: prodmongo/app
2016-10-26T19:34:34.886-0400 E QUERY    [thread1] SyntaxError: missing ; before statement @(shell eval):1:5

$ mongo prodmongo/app --eval "db.getCollectionNames()"
MongoDB shell version: 3.2.10
connecting to: prodmongo/app
[
    "Profiles",
    "Unit_Info"
]

如果你真的想要那种甜美的show collections输出，你可以：

$ mongo prodmongo/app --eval "db.getCollectionNames().join('\n')"
MongoDB shell version: 3.2.10
connecting to: prodmongo/app
Profiles
Unit_Info

score 447 · Accepted Answer

> show collections

将列出当前选定数据库中的所有集合，如命令行帮助 ( help) 中所述。

score 283 · Accepted Answer

How do I list all collections for the current database that I'm using?

Three methods

show collections
show tables
db.getCollectionNames()

To list all databases:

show dbs

To enter or use a given database:

use databasename

To list all collections:

show collections

Output:

collection1
collection2
system.indexes

(or)

show tables

Output:

collection1
collection2
system.indexes

(or)

db.getCollectionNames()

Output:

[ "collection1", "collection2", "system.indexes" ]

To enter or use given collection

use collectionname

score 54 · Accepted Answer

54

> show tables

它给出了与卡梅伦的答案相同的结果。

于 2013-10-14T18:20:01.827 回答

score 31 · Accepted Answer

除了其他人建议的选项：

show collections  // Output every collection
show tables
db.getCollectionNames() // Shows all collections as a list

如果您想知道每个集合是如何创建的（例如，它是具有特定大小的上限集合），还有另一种方法非常方便：

db.system.namespaces.find()

score 25 · Accepted Answer

首先，您需要使用数据库来显示其中的所有集合/表。

>show dbs
users 0.56787GB
test (empty)
>db.test.help() // this will give you all the function which can be used with this db
>use users
>show tables //will show all the collection in the db

score 17 · Accepted Answer

尝试：

help // To show all help methods
show dbs  // To show all dbs
use dbname  // To select your db
show collections // To show all collections in selected db

score 16 · Accepted Answer

16

You can use show tables or show collections.

于 2015-04-16T08:46:13.710 回答

score 12 · Accepted Answer

The command used for displaying all the collections in the MongoDB database is

show collections

Before running the show collections command you have to select the database:

use mydb // mydb is the name of the database being selected

To see all the databases, you can use the command

show dbs // Shows all the database names present

For more information, visit see Getting Started.

score 11 · Accepted Answer

If you want to show all collections from the MongoDB shell (command line), use the shell helper,

show collections

that shows all collections for the current database. If you want to get all collection lists from your application then you can use the MongoDB database method

db.getCollectionNames()

For more information about the MongoDB shell helper, you can see mongo Shell Quick Reference.

score 11 · Accepted Answer

The following commands on mongoshell are common.

show databases
show collections

Also,

show dbs
use mydb
db.getCollectionNames()

Sometimes it's useful to see all collections as well as the indexes on the collections which are part of the overall namespace:

Here's how you would do that:

db.getCollectionNames().forEach(function(collection) {
    indexes = db[collection].getIndexes();
    print("Indexes for " + collection + ":");
    printjson(indexes);
});

Between the three commands and this snippet, you should be well covered!

score 11 · Accepted Answer

I think one of the biggest confusions is the difference between what you can do with mongo (or an interactive/hybrid shell) vs. mongo --eval (or a pure JavaScript shell). I keep these helpful documents handy:

Here is an example of scripting what you might otherwise do with show commands:

# List all databases and the collections in them

mongo --eval "
    db.getMongo().getDBNames().forEach(
        function(v, i){
            print(
                v + '\n\t' +
                db.getSiblingDB(v).getCollectionNames().join('\n\t')
            )
        }
    )
"

Note: That works really well as a one-liner. (But it looks terrible on Stack Overflow.)

mongo --eval "db.getMongo().getDBNames().forEach(function(v, i){print(v+'\n\t'+db.getSiblingDB(v).getCollectionNames().join('\n\t'))})"

score 6 · Accepted Answer

> show dbs        
anuradhfirst  0.000GB
local         0.000GB
> use anuradhfirst
switched to db anuradhfirst
> show collections
record

connect with the MongoDB database using mongo. This will start the connection.
then run show dbs command. This will show you all exiting/available databases.
then select the database you want. In the above it is anuradhfirst. Then run use anuradhfirst. This will switch to the database you want.
then run show collections command. This will show all the collections inside your selected database.

score 6 · Accepted Answer

 1. show collections; // Display all collections
 2. show tables     // Display all collections
 3. db.getCollectionNames();   // Return array of collection. Example :[ "orders", "system.profile" ]

Detailed information for every collection:

db.runCommand( { listCollections: 1.0, authorizedCollections: true, nameOnly: true } )

For users with the required access (privileges that grant listCollections action on the database), the method lists the names of all collections for the database.
For users without the required access, the method lists only the collections for which the users has privileges. For example, if a user has find on a specific collection in a database, the method would return just that collection.

To list collections list based on a search string.

db.getCollectionNames().filter(function (CollectionName) { return /<Search String>/.test(CollectionName) })

Example: Find all collection having "import" in the name

db.getCollectionNames().filter(function (CollectionName) { return /import/.test(CollectionName) })

score 5 · Accepted Answer

For switching to the database.

By:

use {your_database_name} example:

use friends

where friends is the name of your database.

Then write:

db.getCollectionNames()
show collections

This will give you the name of collections.

score 4 · Accepted Answer

4

On >=2.x, you can do

db.listCollections()

On 1.x you can do

db.getCollectionNames()

于 2016-01-12T02:30:44.907 回答

score 3 · Accepted Answer

List all collections from the mongo shell:

db.getCollectionNames()

show collections

show tables

Note: Collections will show from current database where you are in currently

score 2 · Accepted Answer

show collections

This command usually works on the MongoDB shell once you have switched to the database.

score 2 · Accepted Answer

2

In case anyone uses Python & PyMongo:

db.list_collection_names()

于 2021-10-28T23:01:01.663 回答

score 1 · Accepted Answer

For MongoDB 3.0 deployments using the WiredTiger storage engine, if you run db.getCollectionNames() from a version of the mongo shell before 3.0 or a version of the driver prior to 3.0 compatible version, db.getCollectionNames() will return no data, even if there are existing collections.

For further details, please refer to this.

score 0 · Accepted Answer

I use listCollections (supports MongoDB 3.0 and up) for this purpose.

Example:

db.runCommand({ listCollections: 1, filter: {}, nameOnly: true });

To fetch more information like the index of the collection:

db.runCommand({ listCollections: 1, filter: {}, nameOnly: false });

To print just the collection names:

db.runCommand({ listCollections: 1, filter: {}, nameOnly: true }).cursor.firstBatch.forEach(v => {print(v.name)})

I feel this provides more flexibility.

mongodb - 如何列出 MongoDB shell 中的所有集合？

23 回答 23

Three methods

To list all databases:

To enter or use a given database:

To list all collections:

To enter or use given collection

Related

Reference