-1

我正在努力对子字符串进行子字符串化并获取 SQL 中的值。

我有一个 JSON 字符串，如下所示：

DECLARE @string varchar(max)= '[{"CustomFieldId":18,"FieldName":"ABCD","FieldType":"freeText","FieldValue":null,"Details":null,"Value":null,"RelationTable":null,"Isisible":true,"IsAdmin":false,"CreatedDate":null,"ModifiedDate":null,"LoggedInUser":"TESTUSER"},{"CustomFieldId":19,"FieldName":"Workdomain","FieldType":"freeText","FieldValue":null,"Details":null,"Value":null,"RelationTable":null,"IsVisible":true,"IsAdmin":false,"CreatedDate":null,"ModifiedDate":null,"LoggedInUser":"149645"},{"CustomFieldId":20,"FieldName":"TEST1234","FieldType":"freeText","FieldValue":"Sometest","Details":null,"Value":null,"RelationTable":null,"IsVisible":false,"IsAdmin":false,"CreatedDate":null,"ModifiedDate":null,"_listlovFields":[],"org4Values":[],"LoggedInUser":"TESTUSER"}]'

或者也可以是这样的：

DECLARE @string varchar(max) = '[{"CustomFieldId":20,"FieldName":"TEST1234","FieldType":"freeText","FieldValue":"Sometest","Details":null,"Value":null,"RelationTable":null,"IsVisible":false,"IsAdmin":false,"CreatedDate":null,"ModifiedDate":null,"LoggedInUser":"TESTUSER"}]'

现在，我需要从其中任何一个那里获取具有特定“FieldName”的特定“CustomFieldId”的“FieldValue”，并且该 FieldValue 以特定字符串开头。

就像，我会得到这些：

declare @propName varchar(max) = 'Test1234',
@customFieldId varchar(max) = 20,
@value varchar(max) = 'Some'

因此，在这种特殊情况下，我需要使用 CustomFieldId:"20", FieldName":"TEST1234" 以及 FieldValue 以“Some”开头的自定义字段的 FieldValue。

输出只需要字符串“Sometest”，因为这是 CustomFieldId 的 FieldValue:"20"

对此的任何帮助将不胜感激。

4

1 回答 1

0

当您在 sql 服务器上安装正则表达式函数时，这很容易解决。我已经包含了您可以找到它们的链接。

https://www.simple-talk.com/sql/t-sql-programming/clr-assembly-regex-functions-for-sql-server-by-example/

declare @CustomFieldId nvarchar(50)= '20'
declare @FieldName nvarchar(50) = 'TEST1234'
declare @FieldValueStartsWith nvarchar(50) = 'Some'

declare @input nvarchar(500)
select @input = '[{"CustomFieldId":20,"FieldName":"TEST1234","FieldType":"freeText","FieldValue":"Sometest","Details":null,"Value":null,"RelationTable":null,"IsVisible":false,"IsAdmin":false,"CreatedDate":null,"ModifiedDate":null,"LoggedInUser":"TESTUSER"}]'

declare @result nvarchar(500)
declare @expression nvarchar(200) = '.*"CustomFieldId":' + @CustomFieldId + ',"FieldName":"' + @FieldName + '".*"FieldValue":("' + @FieldValueStartsWith + '\w+").*'
select @result = dbo.RegExReplaceX(@expression,@input,'$1',dbo.RegExOptionEnumeration(0,0,0,0,1,0,0,0,0)) -- OPTION = FOR CASE SENSITIVE 
if @result = @input SELECT NULL ELSE SELECT @RESULT
于 2017-07-01T13:02:36.173 回答