Dump your from -> to mapping into a new table, and perform updates such as the below:
UPDATE MLT
SET link = LM.newlink
FROM mylinktable MLT
INNER JOIN linkmap LM
ON LM.oldlink = MLT.link
...to find which fields need updating - now that requires some knowledge of the data you're storing. A query such as SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE COLUMN_NAME LIKE '%link%'
may be useful here.
Will A
2010-08-07 08:32:48