Go语言time包的练习及封装
jopen
10年前
把time包相关的函数用法过了下,基本包含大部份常见的用法了.
并封装了下日期显示格式定制及time.Time数组排序的功能.以便以后调用.
保留下测试所用例子:
package main //author:xcl //2014-1-14 import ( "fmt" "time" "github.com/xclpkg/utils" "sort" ) func main(){ t := time.Now(); //alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss'; //select to_date('2014-06-09 18:04:06','yyyy-MM-dd HH24:mi:ss') as dt from dual; fmt.Println("\n演示时间 => ",utils.GetTmShortStr(t,"y-m-d H:i:s a")) //返回当前是一年中的第几天 //select to_char(sysdate,'ddd'),sysdate from dual; yd := t.YearDay(); fmt.Println("一年中的第几天: ",yd) //一年中的第几周 year,week := t.ISOWeek() fmt.Println("一年中的第几周: ",year," | ",week) //当前是周几 //select to_char(sysdate,'day') from dual; //select to_char(sysdate,'day','NLS_DATE_LANGUAGE = American') from dual; fmt.Println("当前是周几: ",t.Weekday().String()) //字符串转成time.Time //alter session set nls_date_format='yyyy-mm-dd hh:mi:ss'; //select to_date('14-06-09 6:04:06','yy-MM-dd hh:mi:ss') as dt from dual; tt,er := time.Parse(utils.GoStdTime(),"2014-06-09 16:04:06") if(er != nil){ fmt.Println("字符串转时间: parse error!") }else{ fmt.Println("字符串转时间: ",tt.String()) } fmt.Println("\n演示时间 => ",utils.GetTmStr(t,"y-m-d h:i:s")) ta := t.AddDate(1,0,0) fmt.Println("增加一年 => ",utils.GetTmStr(ta,"y-m-d")) ta = t.AddDate(0,1,0) fmt.Println("增加一月 => ",utils.GetTmStr(ta,"y-m-d")) //select sysdate,sysdate + interval '1' day from dual; ta = t.AddDate(0,0,1) //18 fmt.Println("增加一天 => ",utils.GetTmStr(ta,"y-m-d")) durdm,_ := time.ParseDuration("432h") ta = t.Add(durdm) fmt.Println("增加18天(18*24=432h) => ",utils.GetTmStr(ta,"y-m-d")) //select sysdate,sysdate - interval '7' hour from dual; dur,_ := time.ParseDuration("-2h") ta = t.Add(dur) fmt.Println("减去二小时 => ",utils.GetTmStr(ta,"y-m-d h:i:s")) //select sysdate,sysdate - interval '7' MINUTE from dual; durmi,_ := time.ParseDuration("-7m") ta = t.Add(durmi) fmt.Println("减去7分钟 => ",utils.GetTmStr(ta,"y-m-d h:i:s")) //select sysdate,sysdate - interval '10' second from dual; durs,_ := time.ParseDuration("-10s") ta = t.Add(durs) fmt.Println("减去10秒 => ",utils.GetTmStr(ta,"y-m-d h:i:s")) ttr,er := time.Parse(utils.GoStdTime(),"2014-06-09 16:58:06") if(er != nil){ fmt.Println("字符串转时间: 转换失败!") }else{ fmt.Println("字符串转时间: ",ttr.String()) } //alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss'; //select trunc(to_date('2014-06-09 16:58:06','yyyy-mm-dd hh24:mi:ss'),'mi') as dt from dual; // SQL => 2014-06-09 16:58:00 // Truncate => 2014-06-09 16:50:00 durtr,_ := time.ParseDuration("10m") ta = ttr.Truncate(durtr) fmt.Println("Truncate => ",utils.GetTmStr(ta,"y-m-d H:i:s")) //select round(to_date('2014-06-09 16:58:06','yyyy-mm-dd hh24:mi:ss'),'mi') as dt from dual; // SQL => 2014-06-09 16:58:00 // Round => 2014-06-09 17:00:00 ta = ttr.Round(durtr) fmt.Println("Round => ",utils.GetTmStr(ta,"y-m-d H:i:s")) //日期比较 tar1,_ := time.Parse(utils.GoStdTime(),"2014-06-09 19:38:36") tar2,_ := time.Parse(utils.GoStdTime(),"2015-01-14 17:08:26") if tar1.After(tar2) { fmt.Println("tar1 > tar2") }else if tar1.Before(tar2) { fmt.Println("tar1 < tar2") }else{ fmt.Println("tar1 = tar2") } tar3,_ := time.Parse(utils.GoStdTime(),"2000-07-19 15:58:16") //日期列表中最晚日期 // select greatest('2014-06-09','2015-01-14','2000-07-19') from dual; var arr utils.TimeSlice arr = []time.Time{tar1,tar2,tar3} temp := utils.Greatest(arr) fmt.Println("日期列表中最晚日期 => ",utils.GetTmStr(temp,"y-m-d")) //日期数组从早至晚排序 fmt.Println("\n日期数组从早至晚排序") sort.Sort(arr) for _,at := range arr { fmt.Println("Sort => ",utils.GetTmStr(at,"y-m-d H:i:s")) } } AddDate与ParseDuration有个区别需要注意:
在AddDate中各位置是独立的.既在对应位置的更改,不会影响其它位置的值,如日期add超过月底(30/31),月份不会自动增加,而日期则会变更为01.
但ParseDuration则不同,是针对整个time.Time的变更.
例子中将Oracle相关功能的SQL实现,也简单的附注了下.日期时间处理其实蛮复杂的,
查查Oracle的Date和Timestamp相关知识就知道要考虑多少东西了.time包能封装的这么简洁真不容易.
我自己封装的包放在此: github
MAIL: xcl_168@aliyun.com
BLOG:http://blog.csdn.net/xcl168