Administrator

From http://dev.mysql.com/doc/mysql/en/Pe..._problems.html

2.7.3 Problems Using the Perl DBI/DBD Interface



If Perl reports that it can't find the `../mysql/mysql.so' module, then the problem is probably that Perl can't locate the shared library `libmysqlclient.so'.

You should be able to fix this by one of the following methods:

• Compile the DBD::mysql distribution with perl Makefile.PL -static -config rather than perl Makefile.PL.
• Copy `libmysqlclient.so' to the directory where your other shared libraries are located (probably `/usr/lib' or `/lib').
• Modify the -L options used to compile DBD::mysql to reflect the actual location of `libmysqlclient.so'.
• On Linux, you can add the pathname of the directory where `libmysqlclient.so' is located to the `/etc/ld.so.conf' file.
• Add the pathname of the directory where `libmysqlclient.so' is located to the LD_RUN_PATH environment variable. Some systems use LD_LIBRARY_PATH instead.

Note that you may also need to modify the -L options if there are other libraries that the linker fails to find. For example, if the linker cannot find libc because it is in `/lib' and the link command specifies -L/usr/lib, change the -L option to -L/lib or add -L/lib to the existing link command.

If you get the following errors from DBD::mysql, you are probably using gcc (or using an old binary compiled with gcc):

/usr/bin/perl: can't resolve symbol '__moddi3'/usr/bin/perl: can't resolve symbol '__divdi3'Add -L/usr/lib/gcc-lib/... -lgcc to the link command when the `mysql.so' library gets built (check the output from make for `mysql.so' when you compile the Perl client). The -L option should specify the pathname of the directory where `libgcc.a' is located on your system.

Another cause of this problem may be that Perl and MySQL aren't both compiled with gcc. In this case, you can solve the mismatch by compiling both with gcc.

You may see the following error from DBD::mysql when you run the tests:

t/00base............install_driver(mysql) failed:Can't load '../blib/arch/auto/DBD/mysql/mysql.so' for module DBD::mysql:../blib/arch/auto/DBD/mysql/mysql.so: undefined symbol:uncompress at /usr/lib/perl5/5.00503/i586-linux/DynaLoader.pm line 169.This means that you need to include the -lz compression library on the link line. That can be done by changing the following line in the file `lib/DBD/mysql/Install.pm':

$sysliblist .= " -lm";Change that line to:

$sysliblist .= " -lm -lz";After this, you must run make realclean and then proceed with the installation from the beginning.

If you want to install DBI on SCO, you have to edit the `Makefile' in DBI-xxx and each subdirectory.

Note that the following assumes gcc 2.95.2 or newer:

OLD: NEW:CC = cc CC = gccCCCDLFLAGS = -KPIC -W1,-Bexport CCCDLFLAGS = -fpicCCDLFLAGS = -wl,-Bexport CCDLFLAGS =LD = ld LD = gcc -G -fpicLDDLFLAGS = -G -L/usr/local/lib LDDLFLAGS = -L/usr/local/libLDFLAGS = -belf -L/usr/local/lib LDFLAGS = -L/usr/local/libLD = ld LD = gcc -G -fpicOPTIMISE = -Od OPTIMISE = -O1OLD:CCCFLAGS = -belf -dy -w0 -U M_XENIX -DPERL_SCO5 -I/usr/local/includeNEW:CCFLAGS = -U M_XENIX -DPERL_SCO5 -I/usr/local/includeThis is because the Perl dynaloader will not load the DBI modules if they were compiled with icc or cc.

If you want to use the Perl module on a system that doesn't support dynamic linking (like SCO), you can generate a static version of Perl that includes DBI and DBD::mysql. The way this works is that you generate a version of Perl with the DBI code linked in and install it on top of your current Perl. Then you use that to build a version of Perl that additionally has the DBD code linked in, and install that.

On SCO, you must have the following environment variables set:

LD_LIBRARY_PATH=/lib:/usr/lib:/usr/local/lib:/usr/progressive/libOr:

LD_LIBRARY_PATH=/usr/lib:/lib:/usr/local/lib:/usr/ccs/lib:\ /usr/progressive/lib:/usr/skunk/libLIBPATH=/usr/lib:/lib:/usr/local/lib:/usr/ccs/lib:\ /usr/progressive/lib:/usr/skunk/libMANPATH=scohelp:/usr/man:/usr/local1/man:/usr/local/man:\ /usr/skunk/man:First, create a Perl that includes a statically linked DBI module by running these commands in the directory where your DBI distribution is located:

shell> perl Makefile.PL -static -configshell> makeshell> make installshell> make perlThen you must install the new Perl. The output of make perl will indicate the exact make command you will need to execute to perform the installation. On SCO, this is make -f Makefile.aperl inst_perl MAP_TARGET=perl.

Next, use the just-created Perl to create another Perl that also includes a statically linked DBD::mysql by running these commands in the directory where your DBD::mysql distribution is located:

shell> perl Makefile.PL -static -configshell> makeshell> make installshell> make perlFinally, you should install this new Perl. Again, the output of make perl indicates the command to use.