A: 

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
not a spesific table,all of tables in database
tobias
@tobias - in your question you say "db field". You need to explain more. Why not edit your question and add that you need to change this field in multiple tables, as it appears in many of them.
Oded
sorry,i just have changed it.
tobias
+1  A: 

I think this link might help you http://vyaskn.tripod.com/sql_server_search_and_replace.htm

SubPortal
I've used this in multiple instances and it works great.
Aaron D