Hello,
I start my tests with dbi_driver_specific_function(). For now, my
tests fail but I need investigate why and report more details here.
In test cases test_dbi.c:
if ((custom_function =
dbi_driver_specific_function(dbi_conn_get_driver(conn),
"mysql_get_proto_info")) != NULL) {
protocol = custom_function(myconn->connection);
printf("\tmysql_get_proto_info returned: %d\n", protocol);
return 0;
Some questions;
- If custom_function(myconn->connection) need more parameters (ex:.
for the function
dbi_driver_specific_function(dbi_conn_get_driver(conn),
"mysql_get_row")) like custom_function(myconn->connection,
command_sql) is possible too, ok?
> First of all, using driver-specific functions is a bad thing :-/
Ok
> unless you provide workarounds for other drivers in your code. That
> said, libdbi now supports calling the database engine client library
> functions of the abovementioned drivers as far as possible.
In my code, I have a workarounds for this.
>A few limitations exist:
>
> (1) MySQL apparently implements some of the (usually deprecated)
> functions as macros which have no symbol in the library. You can't
> call these "functions", but usually a newer replacement exists.
>
> (2) Using driver-specific functions requires an additional header
> file, <dbi/dbi-dev.h> in addition to <dbi/dbi.h>
>
OK
> (3) Calling the functions often requires knowledge of the inner
> workings of the driver. This holds true e.g. for firebird, as the
> connection handle cannot simply be cast to a structure pointer
> which provides a database handle.
>
> I've added appropriate tests to the test program which you can
> conveniently run by "make check". Please have a look at
> test_custom_function() to see how to call driver-specific functions.
>
>
I have other questions (not explicitly for this post):
- In my code I have the follow structure
struct B_DB {
BQUEUE bq; /* queue control */
brwlock_t lock; /* transaction lock */
dbi_conn *db;
dbi_result *result;
dbi_inst instance;
}
- How I can cast the follow:
dbi_conn_t *myconn = mdb->db;
Because in line 560 of test_dbi.c we have:
int test_custom_function(struct CONNINFO* ptr_cinfo, dbi_conn conn) {
dbi_conn_t *myconn = conn;
I not know how do this in my code like test_dbi.c do.
Thanks Markus
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