In PostgreSQL, the COPY statement [1] provides a fast way to perform bulk
insertion and retrieval. To use COPY ... FROM for bulk insertion, the
data must first be converted to a special CSV-like format.
This package provides basic support for converting data to the format
needed by COPY ... FROM. However, it does not provide the inverse
operation (namely, reading data produced by COPY ... TO), nor does it
support formatting customizations (what delimiter to use, how to represent
NULL, etc.).
[1]: http://www.postgresql.org/docs/current/static/sql-copy.html