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This directory contains drivers for the DBMI library. | ||
The driver functions are for internal usage. | ||
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The DBMI API to be used for module programming is available in: | ||
`lib/db/` | ||
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NOTE: | ||
`db__driver_*` functions are implemented in a driver. If some of them | ||
are not used or defined, the driver will use stub functions in | ||
`lib/db/stubs/`. | ||
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For some platforms like Cygwin, multiply defined symbols are not | ||
resolved in a way that UNIX does. Even worse is that it is impossible | ||
to build shared libraries with undefined symbols. For example, | ||
`libgrass*dbmidriver.so` cannot be built without any implementations | ||
of `db__driver*\*` functions which should be specific to a db driver. | ||
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To work around this problem, function pointers are defined to use | ||
driver's implementations instead of those of the db stubs library. | ||
To do this automatically, run `../mk_dbdriver_h.sh` (GRASS GIS 6) | ||
in driver's directory, `#include "dbdriver.h"` from `main.c`, and | ||
execute `init_dbdriver()`. | ||
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Function pointers are defined in `lib/db/dbmi_driver/dbstubs.h` | ||
This header file can be generated with | ||
`lib/db/dbmi_driver/mk_dbstubs_h.sh` (GRASS GIS 6). | ||
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Please read lib/db/README.md and | ||
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<https://grass.osgeo.org/programming8/dbmilib.html> |
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