FreeTDS Development Group

["Lowden, James K" <james.k.lowden AT alliancebernstein.com>]

Hi Freddy, 

> From: ZIGLIO, Frediano, VF-IT
> Sent: Friday, March 16, 2007 4:45 AM
> 
> Mmmm.... some time ago I though about writing a table to specify
> types informations like:
> - size (if fixed)
> - size length (that is varsize, if variable)
> - nullable
> - if blob
> - if collate
> - if numeric
> - tds version ?? (2 bits, tds5 only and tds7 only are sufficient)
> - bitmask of possible sizes possible ??

Good idea! How about:

typedef struct _TDS_DATATYPE
{
        unsigned short    size:4        /* zero if not fixed */
                                , varint_size:3
                                , nullable:1
                                , collate:1
                                , isnumeric:1
                                , ischar:1
                                , isfloat:1
                                ;
        unsigned short max_size, printable_size;
} TDS_DATATYPE;

#define ISVARYLEN(x) (x.size == 0)
#define ISBLOB(x) (x.varint_size == 4)
#define MAX_SIZE(x) (x.varint_size == 4? 1 << 32 : x.max_size)

(I don't see the point of recording in which TDS version each datatype
is used.)


> I start thinking about fully privatize libTDS
...
> That is: no library installed, no include installed.

Agreed. 

Regards, 

--jkl

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