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How to work with Stored JavaScript in MongoDB?
It is saved in the special system.js collection. For this, use db.system.js.save(). Following is the syntax −
db.system.js.save({
_id: "anyFunctionName",
value: function (returnValue) {
return ‘yourMessage ' + returnValue;
}
})Let us implement the above syntax. Following is the query −
> db.system.js.save({
... _id: "returnValue",
... value: function (data) {
... return 'The value==== ' + data;
... }
... })
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Following is the query to call the above function to print the actual data −
> db.eval("returnValue(20)")
WARNING: db.eval is deprecatedThis will produce the following output −
The value==== 20
Updated on: 13-May-2020
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