SQL语句中将Datetime类型转换为字符串类型0Feb 22 2006 4:26PM CONVERT(CHAR(19), CURRENT_TIMESTAMP, 0)
1 02/22/06 CONVERT(CHAR(8), CURRENT_TIMESTAMP, 1)
2 06.02.22 CONVERT(CHAR(8), CURRENT_TIMESTAMP, 2)
3 22/02/06 CONVERT(CHAR(8), CURRENT_TIMESTAMP, 3)
4 22.02.06 CONVERT(CHAR(8), CURRENT_TIMESTAMP, 4)
5 22-02-0
6 CONVERT(CHAR(8), CURRENT_TIMESTAMP, 5)
6 22 Feb 06 CONVERT(CHAR(9), CURRENT_TIMESTAMP, 6)
7 Feb 22, 06 CONVERT(CHAR(10), CURRENT_TIMESTAMP, 7)
8 16:26:08 CONVERT(CHAR(8), CURRENT_TIMESTAMP, 8)
9 Feb 22 2006 4:26:08:020PM CONVERT(CHAR(26), CURRENT_TIMESTAMP, 9)
10 02-22-06 CONVERT(CHAR(8), CURRENT_TIMESTAMP, 10)
11 06/02/22 CONVERT(CHAR(8), CURRENT_TIMESTAMP, 11)
12 060222 CONVERT(CHAR(6), CURRENT_TIMESTAMP, 12)
13 22 Feb 2006 16:26:08:020 CONVERT(CHAR(24), CURRENT_TIMESTAMP, 13)
14 16:26:08:037 CONVERT(CHAR(12), CURRENT_TIMESTAMP, 14)
20 2006-02-22 16:26:08 CONVERT(CHAR(19), CURRENT_TIMESTAMP, 20)
21 2006-02-22 16:26:08.037 CONVERT(CHAR(23), CURRENT_TIMESTAMP, 21)
22 02/22/06 4:26:08 PM CONVERT(CHAR(20), CURRENT_TIMESTAMP, 22)
23 2006-02-22 CONVERT(CHAR(10), CURRENT_TIMESTAMP, 23)
24 16:26:08 CONVERT(CHAR(8), CURRENT_TIMESTAMP, 24)
25 2006-02-22 16:26:08.037 CONVERT(CHAR(23), CURRENT_TIMESTAMP, 25)
100 Feb 22 2006 4:26PM CONVERT(CHAR(19), CURRENT_TIMESTAMP, 100)
101 02/22/2006 CONVERT(CHAR(10), CURRENT_TIMESTAMP, 101)
102 2006.02.22 CONVERT(CHAR(10), CURRENT_TIMESTAMP, 102)
103 22/02/2006 CONVERT(CHAR(10), CURRENT_TIMESTAMP, 103)
104 22.02.2006 CONVERT(CHAR(10), CURRENT_TIMESTAMP, 104)
105 22-02-2006 CONVERT(CHAR(10), CURRENT_TIMESTAMP, 105)
106 22 Feb 2006 CONVERT(CHAR(11), CURRENT_TIMESTAMP, 106)
107 Feb 22, 2006 CONVERT(CHAR(12), CURRENT_TIMESTAMP, 107)
108 16:26:08 CONVERT(CHAR(8), CURRENT_TIMESTAMP, 108)
109 Feb 22 2006 4:26:08:067PM CONVERT(CHAR(26), CURRENT_TIMESTAMP, 109)
110 02-22-2006 CONVERT(CHAR(10), CURRENT_TIMESTAMP, 110)
111 2006/02/22 CONVERT(CHAR(10), CURRENT_TIMESTAMP, 111)
112 20060222 CONVERT(CHAR(8), CURRENT_TIMESTAMP, 112)
113 22 Feb 2006 16:26:08:067 CONVERT(CHAR(24), CURRENT_TIMESTAMP, 113)
114 16:26:08:067 CONVERT(CHAR(12), CURRENT_TIMESTAMP, 114)
120 2006-02-22 16:26:08 CONVERT(CHAR(19), CURRENT_TIMESTAMP, 120)
121 2006-02-22 16:26:08.080 CONVERT(CHAR(23), CURRENT_TIMESTAMP, 121)
126 2006-02-22T16:26:08.080 CONVERT(CHAR(23), CURRENT_TIMESTAMP, 126)
127 2006-02-22T16:26:08.080 CONVERT(CHAR(23), CURRENT_TIMESTAMP, 127)
130 24  1427 4:26:08:080PM CONVERT(CHAR(32), CURRENT_TIMESTAMP, 130)
131 24/01/1427 4:26:08:080PM CONVERT(CHAR(25), CURRENT_TIMESTAMP, 131)
如数据:
MonitorTime
2012-05-05 00:00:00.000
2012-05-05 16:00:00.000
2012-05-05 17:00:00.000
2012-05-05 18:00:00.000
2012-05-05 19:00:00.000
select CONVERT(CHAR(19), MonitorTime, 120) from t_metData
执⾏结果:
(⽆列名)
2012-05-05 00:00:00
2012-05-05 16:00:00
2012-05-05 17:00:00
我们在处理字符串⽇期格式常⽤DateTime.Pares() 但是这个形式的转换是相当有限的,有些C#是会不懂你写⼊的⽇期格式的如20031231。那么类似 "20100101" 或者其它形式的字符串如何转换成⽇期型呢?
⼀、拼接字符串的形式
DateTime dt=Convert.ToDateTime("20100101".Substring(0,4)+"-"+"20100101".Substring(4,2)+"-"+"20071107".Substring(6,2));
⼆、Convert.ToDateTime(string)
string格式有要求,必须是yyyy-MM-dd hh:mm:ss
三、Convert.ToDateTime(string, IFormatProvider)
DateTime dt;
DateTimeFormatInfo dtFormat = new System.GlobalizationDateTimeFormatInfo();
dtFormat.ShortDatePattern = "yyyy/MM/dd";
dt = Convert.ToDateTime("2011/05/26", dtFormat);
四、DateTime.ParseExact()
日期转字符串函数string dateString = "20110526";
DateTime dt = DateTime.ParseExact(dateString, "yyyyMMdd", System.Globalization.CultureInfo.CurrentCulture);
//或者
DateTime dt = DateTime.ParseExact(dateString, "yyyyMMdd", System.Globalization.CultureInfo.InvariantCulture);
五、DateTime.TryParse(string,out datetime)
1、更多时候,会采⽤DateTime.TryParse(string,out datetime)⽅法,因为此⽅法有安全机制,当string内容不正确时,可以返回⽇期的最⼩值MinValue。并且可以通过返回的bool值判断转化是否成功。⽽DateTime.ParseExact()需要按特定的格式来转换,对格式的要求⽐较严,如果string中不是⽇期内容,⽽量类似“asdfasd”的字符串,则会出错。
2、⽤DateTime.TryParse(string,out datetime)转换后,得到的datetime可以⽤ datetime.ToString("ddd, MMM. dd")来转换为特殊需求的格式,⽐较灵活⽅便。

版权声明:本站内容均来自互联网,仅供演示用,请勿用于商业和其他非法用途。如果侵犯了您的权益请与我们联系QQ:729038198,我们将在24小时内删除。