Golang开发效率是杠杠滴,简单几行代码就可完成一个可用的服务,如下代码:
- 采用Gin作为web framework
- 采用Gorm作为持久化ORM
- 采用Swagger作为OpenAPI文档管理工具
package main
import (
"encoding/csv"
"fmt"
"os"
"strconv"
"time"
_ "export/docs"
"github.com/gin-gonic/gin"
swaggerFiles "github.com/swaggo/files"
ginSwagger "github.com/swaggo/gin-swagger"
"gorm.io/driver/mysql"
"gorm.io/gorm"
)
type Detail struct {
Id int
Name string
FirstTime time.Time
LastTime time.Time
}
// @title NeoApi Swagger 标题
// @version 1.0 版本
// @description NeoApi Service 描述
// @BasePath /api 基础路径
// @query.collection.format multi
func main() {
r := gin.Default()
r.GET("/swagger/*any", ginSwagger.WrapHandler(swaggerFiles.Handler))
r.GET("/api/export", export)
r.POST("/api/data", func(c *gin.Context) {
c.JSON(200, gin.H{
"message": "success",
})
})
r.Run("0.0.0.0:9527")
}
// @Summary 导出数据
// @Description 导出数据
// @Accept json
// @Produce json
// @Success 200 string string "success"
// @Router /api/export [get]
func export(c *gin.Context) {
dsn := "dev:123456@tcp(192.168.1.203:33306)/menshen?charset=utf8mb4&parseTime=true"
db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{})
if err != nil {
panic("failed to connect database")
}
var persons []uint
db.Raw("select id from person").Scan(&persons)
fmt.Println(persons)
month := 3
monthFile := "08.csv"
csvfile, err := os.Create(monthFile)
if err != nil {
fmt.Println("Error:", err)
return
}
defer csvfile.Close()
for _, id := range persons {
var data []Detail
// 注意 Gorm 字段映射默认严格驼峰命名,否则取不到值
db.Raw(`select s.person_id as id, s.person_name as name, min(s.origin_time) as first_time, max(s.origin_time) as last_time from (
select person_id, person_name, origin_time, date_format(origin_time, '%d') as day FROM event_record
where person_id=? and primary_type=100 and PERIOD_DIFF(date_format(now( ), '%Y%m'), date_format(origin_time, '%Y%m'))=?) s group by s.day
`, id, month).Scan(&data)
writer := csv.NewWriter(csvfile)
for _, da := range data {
record := []string{strconv.Itoa(da.Id), da.Name, da.FirstTime.Format("2006-01-02 15:04:05"), da.LastTime.Format("2006-01-02 15:04:05")}
err := writer.Write(record)
if err != nil {
fmt.Println("Error:", err)
return
}
}
writer.Flush()
}
c.JSON(200, gin.H{
"message": "export success",
})
}
简单介绍一下Swagger的使用。
首先导入swagger相关的包
swaggerFiles "github.com/swaggo/files"
ginSwagger "github.com/swaggo/gin-swagger"
_ "export/docs"
- swaggerFiles和ginSwagger是swaggo库提供
- export/docs是swag命令生成的本地API文档源代码(export是我的项目名称),在golang里面只需要docs.go,如下:
其次,想要生成swagger文档也非常简单,
- 安装swag命令行工具:go get github.com/swaggo/swag/cmd/swag@v1.8.12
- 编写项目的swagger注释文档,详见swagger README
- 执行生成命令:swag init 在项目docs目录下生成相关文件
然后,为swagger注册gin路由
r.GET("/swagger/*any", ginSwagger.WrapHandler(swaggerFiles.Handler))
最后,启动服务,访问地址:Swagger UI 即可,如果想查看json格式的文档,可访问地址:localhost:9527/swagger/doc.json