技術標籤：GO

package main

import (
   "database/sql"
   "encoding/json"
   "fmt"
   "github.com/go-sql-driver/mysql"
   "log"
   "strconv"
   "time"
)

var db *sql.DB

func initDb() {
   var err error
   config := mysql.Config{
      User:                 "root",
      Passwd:               "",
      Addr:                 "xxx.xxx.xxx.xxx:3306",
      Net:                  "tcp",
      DBName:               "xxx",
      AllowNativePasswords: true,
      ParseTime:            false,
   }
   db, err = sql.Open("mysql", config.FormatDSN())
   checkError(err)

   // 設定最大連線數
   db.SetMaxOpenConns(25)
   // 設定最大空閒連線數
   db.SetMaxIdleConns(25)
   // 設定每個連結的過期時間
   db.SetConnMaxLifetime(5 * time.Minute)

   // 嘗試連線，失敗會報錯
   err = db.Ping()
   checkError(err)

}

func checkError(err error) {
   if err != nil {
      log.Fatal(err)
   }
}

func Scan(list *sql.Rows) (rows []map[string]string) {
   fields, _ := list.Columns()
   //types,_:= list.ColumnTypes()
   //for _,b:=range types{
   // fmt.Println(b.DatabaseTypeName())
   //}
   //fmt.Printf("%T",types)

   for list.Next() {
      scans := make([]interface{}, len(fields))
      row := make(map[string]string)

      for i := range scans {
         scans[i] = &scans[i]
      }
      list.Scan(scans...)
      for i, v := range scans {
         var value string
         if v != nil {
            value = fmt.Sprintf("%s", v)
         }
         row[fields[i]] = value
      }
      rows = append(rows, row)
   }
   return
}

func main() {

   // 試圖解析、使用和格式化的日期

   initDb()
   list, _ := db.Query("select * from users")

   defer list.Close()
   rows := Scan(list)

   for _, user := range rows {
      var id, _ = strconv.Atoi(user["id"])
      var status, _ = strconv.ParseBool(user["status"])
      // 將日期字串解析為Go的time物件第一個引數指定格式，第二個是日期字串
      const timeLayout = "2006-01-02 15:04:05"
      const timeLayout1 = "2006-01-02"
      const timeLayout2 = "15:04:05"
      myDate, _ := time.Parse(timeLayout, user["created_at"])


      UserIns := struct {
         Id            int
         Name          string
         CreatedAt     string
         RememberToken string
         Status        bool
      }{
         id, user["name"], myDate.Format(timeLayout2), user["remember_token"], status,
      }
      jsonData, _ := json.Marshal(UserIns)
      json := string(jsonData)
      fmt.Println(UserIns)
      fmt.Println(json)
   }

}
 

結果：

{1 admin 01:54:06 zHHWp9NOQ28fiROUlZcHM31WaLfeg1QQnNenLcLUYNLLj5SsHEZOI06GWMcU true}
{"Id":1,"Name":"admin","CreatedAt":"01:54:06","RememberToken":"zHHWp9NOQ28fiROUlZcHM31WaLfeg1QQnNenLcLUYNLLj5SsHEZOI06GWMcU","Status":true}

{15 jack 15:43:04 ovjdd4nJyAFJ1hCHfTHb7bQPnsU3uMwTXNnRgVkHvFluGUpapoGxf0i5Cg5P true}
{"Id":15,"Name":"jack","CreatedAt":"15:43:04","RememberToken":"ovjdd4nJyAFJ1hCHfTHb7bQPnsU3uMwTXNnRgVkHvFluGUpapoGxf0i5Cg5P","Status":true}
{23 測試 19:20:41 NjZBZ47d0dAAnvW7ekhuIvedMbWl42Gq32aSIVjCjYWcz2eFOlndUEOPgY00 true}
{"Id":23,"Name":"測試","CreatedAt":"19:20:41","RememberToken":"NjZBZ47d0dAAnvW7ekhuIvedMbWl42Gq32aSIVjCjYWcz2eFOlndUEOPgY00","Status":true}
{25 測試1 17:25:42 true}
{"Id":25,"Name":"測試1","CreatedAt":"17:25:42","RememberToken":"","Status":true}
{26 demo2 18:16:22 true}
{"Id":26,"Name":"demo2","CreatedAt":"18:16:22","RememberToken":"","Status":true}
{27 demo3 19:08:35 false}
{"Id":27,"Name":"demo3","CreatedAt":"19:08:35","RememberToken":"","Status":false}
{28 user01 22:50:53 false}
{"Id":28,"Name":"user01","CreatedAt":"22:50:53","RememberToken":"","Status":false}
{29 user02 22:52:34 false}
{"Id":29,"Name":"user02","CreatedAt":"22:52:34","RememberToken":"","Status":false}
{30 li 13:57:47 false}
{"Id":30,"Name":"li","CreatedAt":"13:57:47","RememberToken":"","Status":false}