MongoDB快速上手指南： 使用 Mocha 編寫測試 “Test Driven Development”
Mocha 是一個 js 測試的包, 編寫測試有兩個關(guān)鍵字 describe 和 it
describe是一個”統(tǒng)領(lǐng)塊”, 所有的 test functions 都會在它”名下”it表示每一個 test function
create_test.jsconst assert = require('assert')// assume we have a User model defined in src/user.jsconst User = require('../src/user')// after installing Mocha, we have global access// to describe and it keywordsdescribe('Creating records', () => {
it('saves a user', () => {const joe = new User({ name: "Joe" });
joe.save();assert()
});
});復制代碼NoSQL Databases
Benefits of NoSQL
- Easy for inserting and retrieving data, since they are contained in one block, in one json object
- Flexible schema, if a new attribute added, it is easy to just add / append to the object
- Scalability, horizontally partition the data (availability > consistency)
- Aggregation, find metrics and etc
Drawbacks of NoSQL
- Update = Delete + Insert, not built for update
- Not consistent, ACID is not guaranteed, do not support transactions
- Not read optimized. Read entire block find the attribute. But SQL, just need one column (read time compartively slow)
- Relations are not implicit
- JOINS are hard to accomplish, all manually
作者：是小梁同學呀
來源：稀土掘金
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