Help Center/ GaussDB/ Developer Guide(Centralized_2.x)/ Application Development Guide/ Development Based on libpq/ Development Process
Updated on 2023-10-23 GMT+08:00
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Development Process

Obtain release package provided by GaussDB.

To compile and connect to a libpq source program, perform the following operations:
  1. Decompress of GaussDB-Kernel-VxxxRxxxCxx-xxxxx-64bit-Libpq.tar.gz. The required header file is stored in the include folder, and the lib folder contains the required libpq library file.

    In addition to libpq-fe.h, the include folder contains the header files postgres_ext.h, gs_thread.h, and gs_threadlocal.h by default. These three header files are the dependency files of libpq-fe.h.

  2. Include the libpq-fe.h header file. 
    #include <libpq-fe.h>
  3. Provide the -I directory option to provide the installation location of the header files. (Sometimes the compiler looks for the default directory, so this option can be ignored.) Example: 
    gcc -I (Directory where the header files are located) -L (Directory where the libpq library is located) testprog.c -lpq
  4. If the makefile is used, add the following options to variables CPPFLAGS, LDFLAGS, and LIBS: 
    CPPFLAGS += -I (Directory where the header files are located)
LDFLAGS += -L (Directory where the libpq library is located)
LIBS += -lpq