字符串分割到与SQL

Question

不同的列我怎样才能在列这一特定字符串分割为三个不同的列

样本：

Column_A 
---------- 
{"nationalCode":"1234567893","username":"123","ip":"::1"} 
{"nationalCode":"1234567892","username":"test","ip":"172.30.10.11"} 
{"nationalCode":"1234567890"} 
{"nationalCode":"1234567891","username":"test"} 

应该

nationalcode|username|Ip 
--------------------------- 
1234567893 |123  |::1 
1234567892 |test |172.30.10.11 
1234567890 |null |null 
1234567891 |test |null 

我迄今为止只有一个领域尝试过（我不知道如何解决它）

select SUBSTRING(REPLACE(SUBSTRING(ActionInput,CHARINDEX('nationalCode',ActionInput)+len('nationalCode":"'),CHARINDEX(',',ActionInput)),'""',''),0,11) as national1, 
     REPLACE(SUBSTRING(ActionInput,CHARINDEX('username',ActionInput)+len('username":"'),CHARINDEX(',',ActionInput)),'"}','') as a 

     from LogTBL 

Answer 1

在这种情况下，你可以使用Replace通过VALUE()

DECLARE @SampleData AS TABLE 
(
    Column_A varchar(max) 
) 

INSERT INTO @SampleData 
VALUES 
('{"nationalCode":"1234567893","username":"123","ip":"::1"}'), 
('{"nationalCode":"1234567892","username":"test","ip":"172.30.10.11"}'), 
('{"nationalCode":"1234567890"}'), 
('{"nationalCode":"1234567891","username":"test"}') 

;WITH temp AS 
(
    SELECT CAST(REPLACE(replace(replace(replace(sd.Column_A, '":"', '="'), 
        '{"', '<x '),'}','></x>'), '","','" ') AS xml) AS XmlValue 
    FROM @SampleData sd 
) 
SELECT t.XmlValue.value('(/x/@nationalCode)[1]', 'varchar(30)') AS nationalCode, 
     t.XmlValue.value('(/x/@username)[1]', 'varchar(30)') AS username, 
     t.XmlValue.value('(/x/@ip)[1]', 'varchar(30)') AS ip 
FROM temp t 

演示链接改变Column_A成XML并获得预期的数据：http://rextester.com/YEPUI94059