Zhentiw - 博客园

2017年3月7日

[Postgres] Filter Data in a Postgres Table with Query Statements

摘要： We have all this data, but how do we answer questions about it? In this lesson we’ll learn how to filter down to just the information we’re looking fo 阅读全文

posted @ 2017-03-07 19:35 Zhentiw 阅读(162) 评论(0) 推荐(0)

[Postgre] Insert Data into Postgre Tables

摘要： // Insert one row INSERT INTO movies (title, release_date, count_stars, director_id) VALUES ( 'Kill Bill', '10-10-2003', 3, 1 ); // Insert multi rows INSERT INTO movies (title, release_... 阅读全文

posted @ 2017-03-07 19:29 Zhentiw 阅读(192) 评论(0) 推荐(0)

[Ramda] Convert Object Methods into Composable Functions with Ramda

摘要： In this lesson, we'll look at how we can use Ramda's invoker and constructNfunctions to take methods of an object and turn them into reusable utility 阅读全文

posted @ 2017-03-07 16:24 Zhentiw 阅读(205) 评论(0) 推荐(0)

[Django] The admin interface

摘要： Now let's see how to access admin interface. 1. Create a super user which can access admin interface: 2. Inside admin.py, we import the Models we have 阅读全文

posted @ 2017-03-07 04:01 Zhentiw 阅读(408) 评论(0) 推荐(0)

2017年3月6日

[TypeScript] Typescript Interfaces vs Aliases Union & Intersection Types

摘要： TypeScript has 'interface' and 'type', so when to use which? It is recommended that to use 'interface' to define the props that obj should have. 'type 阅读全文

posted @ 2017-03-06 19:48 Zhentiw 阅读(206) 评论(0) 推荐(0)

[Angular] Using ngTemplateOutlet to create dynamic template

摘要： I can use <tamplete> syntax and a entry component as a container to create a dynamic component. Notice it will create a empty div as a placeholder in 阅读全文

posted @ 2017-03-06 19:30 Zhentiw 阅读(1239) 评论(0) 推荐(0)

[Angular] Create dynamic content with <tempalte>

摘要： To create a dynamic template, we need to a entry component as a placeholder. Then we can use entry component to create a new Tamplete into it. As we c 阅读全文

posted @ 2017-03-06 19:11 Zhentiw 阅读(250) 评论(0) 推荐(0)

[Postgres] Create a Postgres Table

摘要： Learn how to create a table using the most widely-used data types (serial, varchar, integer, float, boolean, and date), and the most necessary constra 阅读全文

posted @ 2017-03-06 17:48 Zhentiw 阅读(156) 评论(0) 推荐(0)

[Typescript 2] Nullable Types - Avoiding null and undefined Bugs

摘要： For example you have a TS app: The problem for this piece of code is that, you can assign 'kobe' to null, or undefined. And compiler won't catch this 阅读全文

posted @ 2017-03-06 17:16 Zhentiw 阅读(257) 评论(0) 推荐(0)

[Ramda] Sort, SortBy, SortWith in Ramda

摘要： The difference between sort, sortBy, sortWith is that: 1. sort: take function as args. 2. sortBy: take prop as args. 3. sortWith: take array of funcs 阅读全文

posted @ 2017-03-06 16:51 Zhentiw 阅读(754) 评论(0) 推荐(0)

Answer1215

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