goent code base walkthrough

thuan1412 — Sat, 03 Sep 2022 07:43:21 +0000

Hi everyone, I just found an awesome ORM in Go, that is ent (go-ent). This library provides a code generation feature. With this feature, we-developers can have code suggestions about fields of the table, and easy to write a query to filter records based on condition, unlike other ORMs in Go like gorm, we have to write the raw condition of SQL query

db.Where("name <> ?", "Jinzhou").Find(&users)

In this article, I will dive into the architecture of the ent framework, ...

Ent's main packages

cmd: defines commands for the library.
dialect: handles the dialect support for Mysql, PostgreSQL, SQLite, and Gremlin databases. The package also provides methods for the query builder.
entql: provides (Unary, Binary, ... Expr) structs that implement Stringer interface, these structs generate the expression from their properties.
entc: provides an interface for interacting with entc (ent codegen) as a package rather than an executable
privacy: provides a set of rules for user schema and deals with runtime evaluation.
schema: contains structs that are used by developers when defining an ent schema.

Callback function that use the state of useState() hook

thuan1412 — Sun, 21 Feb 2021 10:41:04 +0000

Callback function that use state

The callback funtion of setInterval, setTimeout and eventListener only get the initialized value of useState in React.

You can see the demo here. The value is log by the callback of setInterval alway be zero.

We can use useRef to solve this problem. See more solution on this

Interesting tutorial about React hooks: https://github.com/ohansemmanuel/react-hooks-cheatsheet

DEV Community: thuan1412

goent code base walkthrough

Callback function that use the state of useState() hook

Callback function that use state