I am researching now the simple "use" command for the mongo command. Please help me.

I just want save the my query in a file, but before that i need to connect to a certain database. For that i tried to find a "use" command like in sql, but could not find anything.

I just want to execute something like

mongo ....--use [db] --eval 'db.find' > save.query

CodePudding user response：

In your question, you didn't specify what platform you're using, are you using Linux? Windows? Anyway, if you want to use the command line for mongo db then I would recommend to use the mongodb shell. Download the mongodb shell https://www.mongodb.com/try/download/shell and select what platform you're using.

CodePudding user response：

https://www.mongodb.com/docs/mongodb-shell/run-commands/#mongosh-usage

That sais you have use <database> command

CodePudding user response：

I just got it. You can just add the database name:

mongo [dbname] --host etc. 

and it worked.

CodePudding user response：

This is the easiest way in linux:

Option 1 ( command line params )

 echo "db.exampleollection.find({}).forEach(function(d){printjson(d)})" | mongo --quiet exampledatabase --host "examplehost" --port "examplePort" --authenticationDatabase=admin -u "exampleuser" -p "examplepassword"  > output.json

Explained:

Send the command you need to execute via echo to the mongo shell and redirect the output to the result file. Add the option --quiet to suppress the shell printed info You can provide the database directly in as comman line argument.

Option 2 : same way but URI format:

 echo "show collections" | mongo "mongodb://user:pass@host:port/database?authSource=admin"  --quiet