[Awesome Go] Use GORM package to make developer-friendly database ORM

Posted on 2020-05-02 Edited on 2024-09-12 In Programming Language , Golang (Go) , Awesome Go , Configuration Views: Word count in article: 2.2k Reading time ≈ 2 mins.

GORM

The fantastic ORM library for Golang aims to be developer friendly.

Overview

Full-Featured ORM
Associations (Has One, Has Many, Belongs To, Many To Many, Polymorphism, Single-table inheritance)
Hooks (Before/After Create/Save/Update/Delete/Find)
Eager loading with Preload, Joins
Transactions, Nested Transactions, Save Point, RollbackTo to Saved Point
Context, Prepared Statement Mode, DryRun Mode
Batch Insert, FindInBatches, Find/Create with Map, CRUD with SQL Expr and Context Valuer
SQL Builder, Upsert, Locking, Optimizer/Index/Comment Hints, Named Argument, SubQuery
Composite Primary Key, Indexes, Constraints
Auto Migrations
Logger
Extendable, flexible plugin API: Database Resolver (Multiple Databases, Read/Write Splitting) / Prometheus…
Every feature comes with tests
Developer Friendly

Installation

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$ go get -u gorm.io/gorm

$ go get -u gorm.io/driver/sqlite

Quick Start

package main

import (
  "gorm.io/gorm"
  "gorm.io/driver/sqlite"
)

type Product struct {
  gorm.Model
  Code  string
  Price uint
}

func main() {
  db, err := gorm.Open(sqlite.Open("test.db"), &gorm.Config{})
  if err != nil {
    panic("failed to connect database")
  }

  // Migrate the schema
  db.AutoMigrate(&Product{})

  // Create
  db.Create(&Product{Code: "D42", Price: 100})

  // Read
  var product Product
  db.First(&product, 1) // find product with integer primary key
  db.First(&product, "code = ?", "D42") // find product with code D42

  // Update - update product's price to 200
  db.Model(&product).Update("Price", 200)
  // Update - update multiple fields
  db.Model(&product).Updates(Product{Price: 200, Code: "F42"}) // non-zero fields
  db.Model(&product).Updates(map[string]interface{}{"Price": 200, "Code": "F42"})

  // Delete - delete product
  db.Delete(&product, 1)
}