How to update json property of TimeStamp in oracle - json

Question

I have one of the column audit_info with JSON data in the table:
{
"AddInfo":{
"UPN":"abc#abc.com",
"UserName":"abc#abc.com",
"TimeStamp":"2021-10-11T15:54:34:4805634Z",
"Source":"xyz"
},
"ChangeInfo":{
"UPN":"abc#abc.com",
"UserName":"abc#abc.com",
"TimeStamp":"2021-10-11T15:54:34:4832421Z",
"Source":"xyz"
}
}
I need to update TimeStamp of seconds decimal point from :4832421Z to .4832421Z
Can anyone please help me?
update the_table
set audit_info=??

Answer 1

Original Question:
If you do not have {:} anywhere else then you can use replace:
UPDATE table_name
SET audit_info = REPLACE(audit_info, '{:}', '{.}');
fiddle
Updated Question:
On later Oracle versions, if you want to update the last : to . in the paths $.AddInfo.TimeStamp and $.ChangeInfo.TimeStamp then you can use use JSON_TABLE to extract the timestamps and then simple string functions to extract the components before and after the last : and then use JSON_MERGEPATCH to update the specific paths:
MERGE INTO table_name dst
USING (
SELECT t.ROWID AS rid,
JSON_OBJECT(
KEY 'AddInfo' VALUE JSON_OBJECT(
KEY 'TimeStamp'
VALUE SUBSTR(addinfo_ts, 1, INSTR(addinfo_ts, ':', -1) - 1)
|| '.' || SUBSTR(addinfo_ts, INSTR(addinfo_ts, ':', -1) + 1)
),
KEY 'ChangeInfo' VALUE JSON_OBJECT(
KEY 'TimeStamp'
VALUE SUBSTR(changeinfo_ts, 1, INSTR(changeinfo_ts, ':', -1) - 1)
|| '.' || SUBSTR(changeinfo_ts, INSTR(changeinfo_ts, ':', -1) + 1)
)
) AS patch
FROM table_name t
CROSS APPLY JSON_TABLE(
t.audit_info,
'$'
COLUMNS
addinfo_ts VARCHAR2(30) PATH '$.AddInfo.TimeStamp',
changeinfo_ts VARCHAR2(30) PATH '$.ChangeInfo.TimeStamp'
) j
) src
ON (src.rid = dst.ROWID)
WHEN MATCHED THEN
UPDATE
SET audit_info = JSON_MERGEPATCH(audit_info, src.patch);
Then, for the sample data, after the MERGE the table contains:
AUDIT_INFO
{"AddInfo":{"UPN":"abc#abc.com","UserName":"abc#abc.com","TimeStamp":"2021-10-11T15:54:34.4805634Z","Source":"xyz"},"ChangeInfo":{"UPN":"abc#abc.com","UserName":"abc#abc.com","TimeStamp":"2021-10-11T15:54:34.4832421Z","Source":"xyz"}}
If you do not want to worry about specific paths then you can use a regular expression to match the timestamp:
UPDATE table_name
SET audit_info = REGEXP_REPLACE(
audit_info,
'("TimeStamp"\s*:\s*"\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}):(\d+Z")',
'\1.\2'
);
fiddle

Answer 2

Try replace. This replace the json field an text and then you convert it again an json. It should be something like this:
update [name_of_the_table]
set audit_info = replace(audit_info::TEXT, ':', '.')::jsonb
where
....