ent 基本使用 一 schema 迁移

ent 是 facebook 开源的golang orm 框架,简单强大,以下是一个简单使用

环境准备

  • 安装ent 工具
go get github.com/facebookincubator/ent/cmd/entc
  • 准备mysql 环境

    使用docker-compose 运行

docker-compose 文件

version: "3"
services:
  mysql:
    image: mysql:5.7.16
    ports:
      - 3306:3306
    command: --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci
    environment:
      MYSQL_ROOT_PASSWORD: dalongrong
      MYSQL_DATABASE: gogs
      MYSQL_USER: gogs
      MYSQL_PASSWORD: dalongrong
      TZ: Asia/Shanghai

启动

docker-compose up  -d
  • 初始化一个golang 项目
go mod init github.com/rongfengliang/ent-demo

使用

  • 初始化schema
entc init User

效果:

├── docker-compose.yaml
└── ent
    └── schema
        └── user.go

golang 代码内容:

package schema
import "github.com/facebookincubator/ent"
// User holds the schema definition for the User entity.
type User struct {
  ent.Schema
}
// Fields of the User.
func (User) Fields() []ent.Field {
  return nil
}
// Edges of the User.
func (User) Edges() []ent.Edge {
  return nil
}
 
 
  • 添加字段
package schema
import (
  "github.com/facebookincubator/ent"
  "github.com/facebookincubator/ent/schema/field"
)
// User holds the schema definition for the User entity.
type User struct {
  ent.Schema
}
// Fields of the User.
func (User) Fields() []ent.Field {
  return []ent.Field{
        field.Int("age").
            Positive(),
        field.String("name").
            Default("unknown"),
    }
}
// Edges of the User.
func (User) Edges() []ent.Edge {
  return nil
}
  • 生成代码
entc generate ./ent/schema

效果:

 

 

  • 编写入口
    main.go
 
package main
import (
    "log"
    "github.com/rongfengliang/ent-demo/ent"
    "context"
    _ "github.com/go-sql-driver/mysql"
)
func main() {
    client, err := ent.Open("mysql", "root:dalongrong@tcp(127.0.0.1)/gogs")
    if err != nil {
        log.Fatalf("failed opening connection to sqlite: %v", err)
    }
    defer client.Close()
    // run the auto migration tool.
    if err := client.Schema.Create(context.Background()); err != nil {
        log.Fatalf("failed creating schema resources: %v", err)
    }
}
 
 
  • 运行

    说明:以上是一个schema 的处理

go run main.go
 
  • 数据库效果

 

 

说明

以上是一个简单的运行 ,后边会有一些其他的使用说明

参考资料

https://entgo.io/docs/getting-started/
https://github.com/facebookincubator/ent
https://github.com/rongfengliang/ent-demo

posted on 2019-10-13 21:37  荣锋亮  阅读(1866)  评论(0编辑  收藏  举报

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