给不合法的格式转换成标准格式(案例)
网上有人问,数据格式转换,需要给不合法的格式转换成标准格式:
创建一张表,把网友提供的数据填充至表:
CREATE TABLE [dbo].[DT] ([Source] NVARCHAR(50)) INSERT INTO [dbo].[DT] ([Source]) VALUES ('2017-05-31 15:00'),('2017-06-02 16:15'),('2017-06-12 14:00'),('2017-06-16 10:30'),('2017-06-16 13:00'),('2017-06-26 8:30'), ('2017-06-29 11:00'),('2017-07-17 16:20'),('2017-07-23 11:00'),('2017-08-0917:15'),('2017-08-09 9:30'),('2017-08-1020:30'), ('2017-08-15 17:20'),('2017-08-1621:00'),('2017-08-17 20:00'),('2017-08-21 10:30'),('2017-08-2116:30'),('2017-08-21 20:30'), ('2017-08-23 17:30'),('2017-08-24 15:30'),('2017-08-29 11:30'),('2017-08-3017:30'),('2017-09-02 10:00'),('2017-09-0415:45'), ('2017-09-05 15:30'),('2017-09-07 9:40'),('2017-09-12 15:30'),('2017-09-12 16:00'),('2017-09-13 13:00'),('2017-09-14 15:30'), ('2017-09-14 19:10'),('2017-09-14 21:00'),('2017-09-15 9:40'),('2017-09-25 9:50'),('2017-09-25 22:45'),('2017-11-03'), ('2017-10-06 15:30'),('2017-10-3016:00'),('2017-11-01 11:30'),('2017-11-1015:20'),('2017-12-05 16:30'),('2017-12-19 16:50'),('2018-07-18 16:00')
下面是Insus.NET的解决方法,写一个自定义函数:
SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO -- ============================================= -- Author: Insus.NET -- Blog: https://insus.cnblogs.com -- Create date: 2019-05-30 -- Update date: 2019-05-30 -- Description: 转换正确日期 -- ============================================= CREATE FUNCTION [dbo].[svf_ConvertToCorrectDateTime] ( @DateTimeString NVARCHAR(MAX) ) RETURNS DATETIME AS BEGIN DECLARE @Source NVARCHAR(MAX) = LTRIM(RTRIM(ISNULL(@DateTimeString,''))) DECLARE @date_Str NVARCHAR(10) = N'' DECLARE @hour_Str NVARCHAR(2) = N'00' DECLARE @minute_Str NVARCHAR(2) = N'00' DECLARE @second_Str NVARCHAR(2) = N'00' IF LEN(@Source) >= 10 SET @date_Str = SUBSTRING(@Source,1,10) IF LEN(@Source) - 10 > 0 BEGIN DECLARE @time_Str NVARCHAR(30) = RTRIM(LTRIM(SUBSTRING(@DateTimeString,11,LEN(@DateTimeString)))) SET @hour_Str = SUBSTRING(@time_Str,1,PATINDEX('%[^0-9]%',@time_Str) -1) SET @minute_Str = SUBSTRING(REVERSE(@time_Str),1,PATINDEX('%[^0-9]%',REVERSE(@time_Str)) -1) END RETURN @date_str + ' ' + @hour_Str + ':' + @minute_Str + ':' + @second_Str END
下面是检验函数和网友提供的数据:
SELECT [Source],[dbo].[svf_ConvertToCorrectDateTime] ([Source]) FROM [DT]
昨晚分享之后,发现程序有一些问题,现在Insus.NET把它修正了,参考:
SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO -- ============================================= -- Author: Insus.NET -- Blog: https://insus.cnblogs.com -- Create date: 2019-05-30 -- Update date: 2019-05-31 -- Description: 转换正确日期 -- ============================================= CREATE FUNCTION [dbo].[svf_ConvertToCorrectDateTime] ( @DateTimeString NVARCHAR(MAX) ) RETURNS DATETIME AS BEGIN DECLARE @Source NVARCHAR(MAX) = LTRIM(RTRIM(ISNULL(@DateTimeString,''))) DECLARE @date NVARCHAR(10) = N'' DECLARE @time NVARCHAR(20) = N'' IF LEN(@Source) >= 10 SET @date = SUBSTRING(@Source,1,10) IF LEN(@Source) - 10 > 0 BEGIN DECLARE @time_Str NVARCHAR(30) = REPLACE(RTRIM(LTRIM(SUBSTRING(@DateTimeString,11,LEN(@DateTimeString)))),' ','') DECLARE @I INT = 1 WHILE @I <= LEN(@time_Str) BEGIN SET @time = @time + CASE WHEN SUBSTRING(@time_Str, @I, 1) LIKE '[0-9]' THEN SUBSTRING(@time_Str, @I, 1) ELSE N':' END SET @I = @I + 1 END WHILE (CHARINDEX('::',@time) <> 0) SET @time = REPLACE(@time,'::',':') END RETURN @date + ' ' + @time END
再次检验结果: