MongoDB (Lesson 4)

3.4 Data Manipulation (emphasis)

As long as the database is absolutely inseparable from the core functions: CRUD (add create, read query retrieve, update updates, delete deletes), in addition to the other, the other is very troublesome, the most troublesome is to modify.

Increase in 3.4.1 data

Use "DB. Collection. Insert ()" to achieve increased data manipulation.

Example: adding a simple data

Db.infos.insert ({"url": "Www.mldn.cn"})

Example: adding an array (with brackets)

Bulkwriteresult () indicates a prompt, prompting for two more lines, and N for the number of rows updated.

If you want to save more than one data, use an array.

Example: Saving 10,000 data

MongoDB (Lesson 4)