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MongoDB query to execute stored function?
JavaScript function can be saved for reuse using a system collection called system.js. To store a function, use the db.collection.save(),
Let us first create a function. Following is the query −
> db.system.js.save({
... _id: "displayMessage",
... value: function (data) {
... return 'The Name is: ' + data;
... }
... })This will produce the following output −
WriteResult({
"nMatched" : 0,
"nUpserted" : 1,
"nModified" : 0,
"_id" : "displayMessage"
})Following is the query to execute stored function −
> db.eval("displayMessage('John')")
WARNING: db.eval is deprecatedThis will produce the following output −
The Name is: John
Updated on: 02-Apr-2020
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