GORM实现MySQL数据表迁移、创建、查询

package main

import (
  "fmt"
  "log"

  "gorm.io/driver/mysql"
  "gorm.io/gorm"
)

func main() {
  dsn := "user:pass@tcp(127.0.0.1:3306)/test?charset=utf8mb4&parseTime=True&loc=Local"
  db, err := gorm.Open(mysql.New(mysql.Config{
    DSN:               dsn,
    DefaultStringSize: 256,
  }), &gorm.Config{})
  if err != nil {
    log.Fatal("数据库链接错误")
  }

  type User struct {
    ID     uint `gorm:"primaryKey"`
    Name   string
    Age    int
    Gender string
  }

  // 创建users表
  db.AutoMigrate(&User{})

  // 创建数据
  user := User{Name: "张三", Age: 18, Gender: "男"}
  db.Create(&user)

  // 批量插入
  users := []User{
    {Name: "李四", Age: 19, Gender: "男"},
    {Name: "王五", Age: 20, Gender: "男"},
  }
  db.CreateInBatches(users, 2)

  // 查询第一个
  db.First(&user)

  // 查询全部对象
  db.Select("name").Where("age = ?", 20).Find(&users)
  for _, user := range users {
    fmt.Println(user.Name)
  }

}