MongoDB's "Stored procedure"

Use Db.system.js.insert ({_id: "AAA", Value: "Zzq"}); This command adds a global key-value pair to the global system JS with a _id of "AAA", Value "Zzq", and then uses it in the next turn.

Db.eval ("AAA"); The command shell can return zzq to me, and value can be an anonymous function, which is used like a JS global method (such as a stored procedure that simulates a relational database) such as: Db.system.js.insert ({_id:  "AAA", Value:function BB () {return 1;}); When using Db.eval ("AAA ()"); Yes the result returns 1;

MongoDB's "Stored procedure"