Hi Kalyan,
Quite a pickle
....but Talend does provide for such situations
Selection 'Edit Connection' & move to step 2. Then, you can choose the below highlighted option & export your connection as contexts & propagate the change (in Property Type) to all affected jobs. Then, assign that context group to your jobs.
Once this setup is done, you can easily provide the environment specific values to the job via (projectname.properties) file & run them conveniently.
Hope this helps.
MathurM