Re: [Q] UTF-8 testing with Windows/ODBC 8.3.0400

thank you,
I have a follow up:

I if I declare a field as varchar(30)
in the UTF-8 Postgres, I assume it can possibly be more than 30 bytes
storage.

so when I set the ODBCs (unicode version) 'max long varchar'
am I setting it to max 'byte length' of the UTF-8 (as in the dabase)
or to '60' (max number of bytes for 30 character string in UTF-16)
or to '30' (max number of valid characters) ?

And would your answer be the same for the unix Odbc version ?

Thank you again for the response,
Vlad

On Thu, 19 Mar 2009 21:28 +0900, "Hiroshi Inoue" <inoue(at)tpf(dot)co(dot)jp>
wrote:
> V S P wrote:
> > Hi thank you for the follow up.
> > Just had a break through...
>
> <snip>
>
> > Three things that I am not still sure about, and may be you can help:
> >
> > a) does Posgtres driver on unixODBC do the same as Windows (that is
> > there is a unicode and non unicode versions of the drivers ?
> > (I am interested in 64 bit linux and 64 bit freebsd ones)
> >
> > b) I noticed that when using the Unicode version (first) and
> > Ascii version (second) the value of SWORD right before SQLVLEN is
> > different
> > (it is 12 on the ascii and -9 on unicode version) -- what does this
> > mean?
>
> It's the SQL data type. 12 means SQL_VARCHAR and -9 means SQL_WVARCHAR.
>
> > disp_otrq_x86d 8a4-b90 EXIT SQLDescribeColW with return code 0
> > (SQL_SUCCESS)
> > HSTMT 013F1BA8
> > UWORD 11
> > WCHAR * 0x01A28974 [ 9] "cntr_data"
> > SWORD 512
> > SWORD * 0x01A28BC4 (9)
> > SWORD * 0x01A28BB8 (-9)
> > SQLULEN * 0x01A28B94 (4096)
> > SWORD * 0x01A28BA0 (0)
> > SWORD * 0x01A28B88 (1)
> >
> >
> > disp_otrq_x86d ab8-498 EXIT SQLDescribeColW with return code 0
> > (SQL_SUCCESS)
> > HSTMT 013F1C38
> > UWORD 11
> > WCHAR * 0x01A28974 [ 9] "cntr_data"
> > SWORD 512
> > SWORD * 0x01A28BC4 (9)
> > SWORD * 0x01A28BB8 (12)
> > SQLULEN * 0x01A28B94 (4096)
> > SWORD * 0x01A28BA0 (0)
> > SWORD * 0x01A28B88 (1)
>
> > another question: I have about 6 tables where about 20 fields in each
> > table,
> > 2 fields are 65K long (they are declared as varchar(65000) is this is OK
> > for ODBC drivers, and what if anything I should be setting on them?
>
> 65K may be OK if you set the max long varchar size > 65000 but please
> note that most applications/middlewares have their own limitation.
> For example the limitation of MS Access is around 65000 AFAIR.
>
> regards,
> Hiroshi Inoue
--
V S P
toreason(at)fastmail(dot)fm

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