Обсуждение: Building SPI programs
Hello I have to do some programming in C or C++ and PostgreSQL. Having not ever done this before, I opened the documentation (in my machine, /usr/local/pgsql/doc) and read about the optionsI had. SPI, libpq, libpq++ and ecpg. I don't want, if possible, an embeded language, or anything that requires a preprocessor.So, I thought to start by trying the first, SPI, which also seemed to be simple. My problem comes when compiling, since the documentation doesn't say where the include files are, nor what libraries to compileagainst. So, I found out about the include dirs required (amazingly, one was in the source directory tree, and was not copied to usr/local/pgsql/includewhen I installed PGSQL), and ended with cc -I/busa/tmp/postgresql-7.0.2/src/include/ -I/usr/local/pgsql/includetest.c -o test With this command line, I got /tmp/ccPIp24d.o: In function `main': /tmp/ccPIp24d.o(.text+0x7): undefined reference to `SPI_connect' /tmp/ccPIp24d.o(.text+0x2b): undefined reference to `SPI_exec' /tmp/ccPIp24d.o(.text+0x33): undefined reference to `SPI_finish' So I supposed I needed to link against some library. With grep I searched /usr/local/pgsql/lib for SPI_, and I found no .a'smatching. I found that /usr/local/pgsql/lib/plpgsql.so and /usr/local/pgsql/lib/pltcl.so had "SPI_", however none worked. So, can somebody help me compile a C program with SPI? Thanks Aristide
On Thu, Feb 22, 2001 at 07:49:56PM -0800, Ian Lance Taylor wrote: > Aristide Aragon <zuri@busa.lionking.org> writes: > > > I have to do some programming in C or C++ and PostgreSQL. > SPI is only for stored procedures which are dynamically linked into > the Postgres backend. > > Ordinary code doesn't do that. It uses some one of the other > mechanisms. > > Ian I don't understand.. So I shouldn't use SPI? If I should, how would I comple a program, if not, what can I use? Can you helpme? Thanks in advance Aristide > > /tmp/ccPIp24d.o(.text+0x7): undefined reference to `SPI_connect' > > /tmp/ccPIp24d.o(.text+0x2b): undefined reference to `SPI_exec' > > /tmp/ccPIp24d.o(.text+0x33): undefined reference to `SPI_finish' > > When your program is dynamically linked in, those functions will be > satisfied by definitions in the Postgres backend. > > > So I supposed I needed to link against some library. With grep I searched /usr/local/pgsql/lib for SPI_, and I foundno .a's matching. > > I found that /usr/local/pgsql/lib/plpgsql.so and /usr/local/pgsql/lib/pltcl.so had "SPI_", however none worked. > > Those are examples of backend procedures which are dynamically linked > in, in those cases to define a language. > > Ian
Aristide Aragon <zuri@busa.lionking.org> writes: > I have to do some programming in C or C++ and PostgreSQL. > Having not ever done this before, I opened the documentation (in my machine, /usr/local/pgsql/doc) and read about the optionsI had. SPI, libpq, libpq++ and ecpg. I don't want, if possible, an embeded language, or anything that requires a preprocessor.So, I thought to start by trying the first, SPI, which also seemed to be simple. SPI is only for stored procedures which are dynamically linked into the Postgres backend. Ordinary code doesn't do that. It uses some one of the other mechanisms. Ian > /tmp/ccPIp24d.o(.text+0x7): undefined reference to `SPI_connect' > /tmp/ccPIp24d.o(.text+0x2b): undefined reference to `SPI_exec' > /tmp/ccPIp24d.o(.text+0x33): undefined reference to `SPI_finish' When your program is dynamically linked in, those functions will be satisfied by definitions in the Postgres backend. > So I supposed I needed to link against some library. With grep I searched /usr/local/pgsql/lib for SPI_, and I found no.a's matching. > I found that /usr/local/pgsql/lib/plpgsql.so and /usr/local/pgsql/lib/pltcl.so had "SPI_", however none worked. Those are examples of backend procedures which are dynamically linked in, in those cases to define a language. Ian
Aristide Aragon <aristide@lionking.org> writes: > On Thu, Feb 22, 2001 at 07:49:56PM -0800, Ian Lance Taylor wrote: > > Aristide Aragon <zuri@busa.lionking.org> writes: > > > > > I have to do some programming in C or C++ and PostgreSQL. > > SPI is only for stored procedures which are dynamically linked into > > the Postgres backend. > > > > Ordinary code doesn't do that. It uses some one of the other > > mechanisms. > > I don't understand.. So I shouldn't use SPI? If I should, how would I comple a program, if not, what can I use? Can youhelp me? You didn't really say what you wanted to do, so I don't know whether you should use SPI or not. If you don't have a clue what I was talking about in my previous message, then you should not use SPI. You should probably use the libpq interface. Ian