【MongoDB】The description of procedure in MongoDB

In this blog the procedure of mongodb will be described in details. It is known that mongodb has provided a series of efficient solution to some different questions, such as high performance, changeable type and so on. Compared with the mysql database, the
mongodb also support the procedure process. The first thing that you should know about procedure is the language, javascript. In the next time, I will set an example to describe this question:

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In the above example, the command ‘db.eval()’ must be attached importance because of its strange feature. We could write the logic into this method and meanwhile call it without declaring the procedure process before calling.

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In the above exmple, one question should be cared about. When you use procedure process, you should define the procedure in the database where you want to use procedure;