一，安装viper

1,viper的代码地址:

https://github.com/spf13/viper

查看viper版本：

https://github.com/spf13/viper/releases

2,安装:

root@ku:~# go get -u github.com/spf13/[email protected]

说明：刘宏缔的go森林是一个专注golang的博客，
          地址：https://blog.csdn.net/weixin_43881017

说明：作者:刘宏缔 邮箱: [email protected]

二，演示项目的相关信息

1,项目地址：

https://github.com/liuhongdi/digv04

2，功能说明：

    能从配置文件中读取数据库等相关的配置

3,项目结构：如图:

三，go代码说明

1，config/config.yaml

1.  
   Database:
2.  
   DBType: mysql
3.  
   UserName: root
4.  
   Password: password
5.  
   Host: 127.0.0.1:3306
6.  
   DBName: dig
7.  
   Charset: utf8
8.  
   ParseTime: True
9.  
   MaxIdleConns: 10
10.  
    MaxOpenConns: 30
11.  
    Server:
12.  
    RunMode: debug
13.  
    HttpPort: 8000
14.  
    ReadTimeout: 60
15.  
    WriteTimeout: 60

2,global/setting.go

1.  
   package global
2.  
    
3.  
   import (
4.  
   "fmt"
5.  
   "github.com/liuhongdi/digv04/pkg/setting"
6.  
   "time"
7.  
   )
8.  
   //服务器配置
9.  
   type ServerSettingS struct {
10.  
    RunMode string
11.  
    HttpPort string
12.  
    ReadTimeout time.Duration
13.  
    WriteTimeout time.Duration
14.  
    }
15.  
    //数据库配置
16.  
    type DatabaseSettingS struct {
17.  
    DBType string
18.  
    UserName string
19.  
    Password string
20.  
    Host string
21.  
    DBName string
22.  
    Charset string
23.  
    ParseTime bool
24.  
    MaxIdleConns int
25.  
    MaxOpenConns int
26.  
    }
27.  
    //定义全局变量
28.  
    var (
29.  
    ServerSetting *ServerSettingS
30.  
    DatabaseSetting *DatabaseSettingS
31.  
    )
32.  
     
33.  
    //读取配置到全局变量
34.  
    func SetupSetting() error {
35.  
    s, err := setting.NewSetting()
36.  
    if err != nil {
37.  
    return err
38.  
    }
39.  
    err = s.ReadSection("Database", &DatabaseSetting)
40.  
    if err != nil {
41.  
    return err
42.  
    }
43.  
     
44.  
    err = s.ReadSection("Server", &ServerSetting)
45.  
    if err != nil {
46.  
    return err
47.  
    }
48.  
     
49.  
    fmt.Println("setting:")
50.  
    fmt.Println(ServerSetting)
51.  
    fmt.Println(DatabaseSetting)
52.  
    return nil
53.  
    }

3,global/db.go

1.  
   package global
2.  
    
3.  
   import (
4.  
   "fmt"
5.  
   "github.com/jinzhu/gorm"
6.  
   )
7.  
    
8.  
   var (
9.  
   DBLink *gorm.DB
10.  
    )
11.  
    //建立数据库连接，配置从配置文件中获取
12.  
    func SetupDBLink() (error) {
13.  
    var err error
14.  
    DBLink, err = gorm.Open(DatabaseSetting.DBType,
15.  
    fmt.Sprintf("%s:%s@tcp(%s)/%s?charset=%s&parseTime=%t&loc=Local",
16.  
    DatabaseSetting.UserName,
17.  
    DatabaseSetting.Password,
18.  
    DatabaseSetting.Host,
19.  
    DatabaseSetting.DBName,
20.  
    DatabaseSetting.Charset,
21.  
    DatabaseSetting.ParseTime,
22.  
    ))
23.  
    if err != nil {
24.  
    return err
25.  
    }
26.  
     
27.  
    if ServerSetting.RunMode == "debug" {
28.  
    DBLink.LogMode(true)
29.  
    }
30.  
    DBLink.SingularTable(true)
31.  
    DBLink.DB().SetMaxIdleConns(DatabaseSetting.MaxIdleConns)
32.  
    DBLink.DB().SetMaxOpenConns(DatabaseSetting.MaxOpenConns)
33.  
    return nil
34.  
    }

4,pkg/setting/setting.go

1.  
   package setting
2.  
    
3.  
   import (
4.  
   "github.com/spf13/viper"
5.  
   )
6.  
    
7.  
   type Setting struct {
8.  
   vp *viper.Viper
9.  
   }
10.  
     
11.  
    var sections = make(map[string]interface{})
12.  
     
13.  
    //读取配置
14.  
    func NewSetting() (*Setting, error) {
15.  
    vp := viper.New()
16.  
    vp.SetConfigName("config")
17.  
    vp.AddConfigPath("config")
18.  
    vp.SetConfigType("yaml")
19.  
    err := vp.ReadInConfig()
20.  
    if err != nil {
21.  
    return nil, err
22.  
    }
23.  
     
24.  
    s := &Setting{vp}
25.  
    return s, nil
26.  
    }
27.  
     
28.  
    //读取指定的一段
29.  
    func (s *Setting) ReadSection(k string, v interface{}) error {
30.  
    err := s.vp.UnmarshalKey(k, v)
31.  
    if err != nil {
32.  
    return err
33.  
    }
34.  
     
35.  
    if _, ok := sections[k]; !ok {
36.  
    sections[k] = v
37.  
    }
38.  
    return nil
39.  
    }
40.  
     
41.  
    //重新加载
42.  
    func (s *Setting) ReloadAllSection() error {
43.  
    for k, v := range sections {
44.  
    err := s.ReadSection(k, v)
45.  
    if err != nil {
46.  
    return err
47.  
    }
48.  
    }
49.  
     
50.  
    return nil
51.  
    }

5,main.go

1.  
   package main
2.  
    
3.  
   import (
4.  
   "github.com/gin-gonic/gin"
5.  
   _ "github.com/jinzhu/gorm/dialects/mysql"
6.  
   "github.com/liuhongdi/digv04/global"
7.  
   "github.com/liuhongdi/digv04/router"
8.  
   "log"
9.  
   )
10.  
     
11.  
    //init
12.  
    func init() {
13.  
    err := global.SetupSetting()
14.  
    if err != nil {
15.  
    log.Fatalf("init.setupSetting err: %v", err)
16.  
    }
17.  
     
18.  
    err = global.SetupDBLink()
19.  
    if err != nil {
20.  
    log.Fatalf("init.setupDBEngine err: %v", err)
21.  
    }
22.  
    }
23.  
     
24.  
    func main() {
25.  
    //设置运行模式
26.  
    gin.SetMode(global.ServerSetting.RunMode)
27.  
    //引入路由
28.  
    r := router.Router()
29.  
    //run
30.  
    r.Run(":"+global.ServerSetting.HttpPort)
31.  
    }

6,其他代码可访问github获取

四，测试效果

1，访问:

http://127.0.0.1:8000/article/getone/1

返回:

说明数据库可以正常连接，端口号也因为配置文件的设置改变成了8000

五，查看库的版本：

1.  
   module github.com/liuhongdi/digv04
2.  
    
3.  
   go 1.15
4.  
    
5.  
   require (
6.  
   github.com/gin-gonic/gin v1.6.3
7.  
   github.com/go-playground/universal-translator v0.17.0
8.  
   github.com/go-playground/validator/v10 v10.2.0
9.  
   github.com/jinzhu/gorm v1.9.16
10.  
    github.com/magiconair/properties v1.8.4 // indirect
11.  
    github.com/mitchellh/mapstructure v1.3.3 // indirect
12.  
    github.com/pelletier/go-toml v1.8.1 // indirect
13.  
    github.com/spf13/afero v1.4.1 // indirect
14.  
    github.com/spf13/cast v1.3.1 // indirect
15.  
    github.com/spf13/jwalterweatherman v1.1.0 // indirect
16.  
    github.com/spf13/pflag v1.0.5 // indirect
17.  
    github.com/spf13/viper v1.7.1
18.  
    golang.org/x/sys v0.0.0-20201119102817-f84b799fce68 // indirect
19.  
    golang.org/x/text v0.3.4 // indirect
20.  
    gopkg.in/ini.v1 v1.62.0 // indirect
21.  
    gopkg.in/yaml.v2 v2.3.0 // indirect
22.  
    )