[Executing SQL query using a C function]

Hello,

I noticed that unilogic has a function named " SQL_QUERY " for executing SQL queries using c language.
I can see that it needs to be passed an array of a struct called " SQLParamData_t ".
This struct it seems that it has three fields: one for the data type, another one for the data length and finally a third for the data itself.
From some try and error I deduced some of this data types values (I hope correctly):

unsigned char    1
signed int    4
unsigned int    5
volatile char*    10

Any ideas where I can find the rest of them, for example the value  for volatile unsigned char* type?

Thanks in advance and best regards,
Juanan