如何在MongoDB Shell中定义别名？(How to define aliases in the MongoDB Shell?)

 我正在使用MongoDB shell并喜欢定义一些快捷方式。 例如，用sd缩写show databases会很不错。 
 
 我已经设法通过将它的定义添加到~/.mongorc.js来向MongoDB shell添加函数hw() ： 
 
function hw() {
    print("Hello World.");
}
 
 当我在mongo-shell中输入hw()时，会打印出Hello World. 
 
 问题1：是否也可以在不必键入括号的情况下执行该功能（即hw而不是hw() ）？ 
 
 我试图使用匿名函数将函数绑定到变量，但我仍然必须键入括号，否则打印出函数的定义 
 
hw=function(){ print("Hello World (anonymous)."); };
 
 问题2：如何从我的函数中执行MongoDB命令？ 我试过了： 
 
function sd() {
    show databases;
}
 
 但是在启动MongoDB shell时会出错： 
 
SyntaxError: Unexpected identifier at /home/edward/.mongorc.js:2

I'm using the MongoDB shell and like to define some shortcuts. For example it would be nice to abbreviate show databases with sd.
 
I already managed to add a function hw() to the MongoDB shell by adding it's definition to the ~/.mongorc.js:
 
function hw() {
    print("Hello World.");
}
 
When I type hw() in the mongo-shell, it prints out Hello World.
 
Question 1: Is it also possible to execute the function without having to type the brackets (i.e. hw instead of hw())?
 
I tried to bind the function to variable using anonymous functions, but still I have to type brackets, otherwise the definition of the function is printed out
 
hw=function(){ print("Hello World (anonymous)."); };
 
Question 2: How can I execute MongoDB commands from within my functions? I tried:
 
function sd() {
    show databases;
}
 
but that gives an error during startup of the MongoDB shell:
 
SyntaxError: Unexpected identifier at /home/edward/.mongorc.js:2

原文：https://stackoverflow.com/questions/28093356