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GORM Guides | GORM - The fantastic ORM library for Golang, aims to be developer...

 4 years ago
source link: http://v2.gorm.io/docs/
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GORM Guides

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 Statment Mode, DryRun Mode
  • Batch Insert, FindInBatches, Find To Map
  • SQL Builder, Upsert, Locking, Optimizer/Index/Comment Hints, NamedArg
  • Composite Primary Key
  • Auto Migrations
  • Logger
  • Extendable, flexible plugin API: Database Resolver (Read/Write Splitting) / Prometheus…
  • Every feature comes with tests
  • Developer Friendly

Install

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)
}

Last updated: 2020-08-21Next


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