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I want to write application which uses Postgresql as DBMS. To write client application do I need libpq library and header files? If yes where I would get libpq library and header files.
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Download one of the "core" files for the particular version you're looking for. You'll get a tarball that if you expand you'll find a "libpq" folder. Where that should go on your system depends on what kind of development toolchain you're using.
libpq is a set of library functions that allow client programs to pass queries to the PostgreSQL backend server and to receive the results of these queries. libpq is also the underlying engine for several other PostgreSQL application interfaces, including those written for C++, Perl, Python, Tcl and ECPG.
Libpq is included in the full PostgreSQL source code. You can use just libpq without the rest of PostgreSQL, but must download the full package.
You can download it from the PostgreSQL Downloads page.
Once you extract the full package it is inside src\interfaces\libpq.
The PostgreSQL installation guide details how to install only the client libraries in the Installation section, under Client-only installation.
Libpq documentation is also available.
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In postgresql sources, src\interfaces\libpq.
And yes, it is possible to compile only the libpq.
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