PostGres Doubt

Hi ,

I am extremely new to PostGreSql. If any one can please answer 
this question of mine. I want to insert/update records into the 
postgres database through C or perl code. The only condition is 
that it should be efficient. Can anybody tell me the difference 
between ecpg and libpq and which one should I work on for solving 
my problem.

Thanks in advance.
Vikas.

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