mirror of
https://github.com/MariaDB/server.git
synced 2025-01-22 14:54:20 +01:00
25 lines
1.1 KiB
Text
25 lines
1.1 KiB
Text
This directory provides a wrapper using the ydb db.h header file but
|
|
it calls the bdb internals. To get this to work requires a little
|
|
magic, since both BDB and YDB use the same type names.
|
|
|
|
BDB helps with a ./configure option (--with-uniquename) that makes it
|
|
so that all the link-time symbols have different names. But the type
|
|
names and enums collide. Hence we cannot include both the
|
|
../include/db.h and the BDB db.h.
|
|
|
|
To fix that we have a header ydb-uniq.h, which uses completely
|
|
different names for everything in the ydb interface. But those names
|
|
are compatible with the standard names: That is all the structs have
|
|
the same layout.
|
|
|
|
Thus we have the following three headers
|
|
bdb_db.h which defines things like db_env_create_4001(DBENV **, ...)
|
|
|
|
ydb_db.h which defines things like db_env_create(DBENV **, ...) (but the DBENV is a different type from BDB's)
|
|
bdbw.h which defines things like db_env_create_ydb(DBENV_ydb **, ...)
|
|
|
|
bdbw.h can be included with bdb_db.h or ydb_db.h
|
|
bdb_db.h and ydb_db.h cannot both be included in the same file.
|
|
|
|
An application, such as mysql, includes db.h from ../include
|
|
That is the ydb header file.
|