Mongo shell从文件执行查询并显示结果

Question

如何使用mongo shell执行外部文件并在控制台中查看结果？

我有外部文件,query.js我希望执行它并在cmd中查看结果.

比方说,该文件的内容是:

db.users.find()

Answer 1

把它放到你的query.js文件中:

function get_results (result) {
    print(tojson(result));
}

db.col.find().forEach(get_results)

并运行:

mongo db_name query.js

这是一个很好的解释,为什么你应该这样做.

Answer 2

我发现从文件运行mongodb查询并在控制台中查看输出的最简单方法是:

query.js:

use my_db;
db.my_collection.findOne()

在命令行上: mongo <query.js

这将显示控制台的所有输出,就像您单独在mongo shell中运行查询一样.

Answer 3

Good information here - wanted to point out that mongo provides a printjson() function so there is no need to write your own unless you need more functionality than printjson() provides.

Example Mongo file (test.js)

// Pretty print all documents in test.scratch
use test
db.scratch.find().forEach(printjson)

Command

mongo < test.js

If you want to omit use test from the mongo file, perhaps to remove IDE error indications for js files, you can specify the target db on the command line:

mongo test < test.js

Interesting to note: the above examples use a redirect to push the file into the mongo shell. This calling convention allows you to enter commands just as you would in the shell; including mongo shell convenience commands like use test.

Mongo provides another script calling convention: mongo test test.js which omits the redirect operator. This calling convention requires test.js to be proper javascript and cannot use the mongo shell convenience methods like use test; one would use the javascript equivalents like getSiblingDB().