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Re: [freetds] FreeTDS does not work with Sybase SQL Anywhere 10, 11 or 12 -- sp_datatype_info()

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  • From: "James K. Lowden" <jklowden AT freetds.org>
  • To: freetds AT lists.ibiblio.org
  • Subject: Re: [freetds] FreeTDS does not work with Sybase SQL Anywhere 10, 11 or 12 -- sp_datatype_info()
  • Date: Wed, 6 Feb 2013 16:12:20 -0500
On Wed, 6 Feb 2013 17:44:38 +0000
Tony Esposito <Tony.Esposito AT region10.org> wrote:

> FreeTDS needs to not be dependent on that sp in order for it to be
> used with SQL Anywhere. Just need to find out what it does.
>
> Otherwise, FreeTDS only works with Sybase ASE.

Tony, if you're willing to do some legwork, I think we can solve this
together.

The attached file implements the resultset returned by sp_datatype_info
in C as an array of struct. The data come from SQL Server 2005. If
you extend the array for SQL Anywhere, we can reference it in
SQLGetTypeInfo().

The inputs to SQLGetTypeInfo() are:

1. server product version (implicitly, from connection)
2. datatype manifest constant
3. ODBC version

We can implement tds_datatype_info() as a binary search of the above
array using those inputs. If the function fails, we can fall back to
calling sp_datatype_info on the server. (The local binary search will
be very fast, microseconds at most.) If both fail, the function
fails.

> I would see this as a limitation to the product.

I would, too, if FreeTDS were a product. Since it's a project, the
only real limitation is our own time, skill, and imagination.

Regards,

--jkl

Attachment: tds_datatype_info.h
Description: Binary data

TYPE_NAME
DATA_TYPE PRECISION
LITERAL_PREFIX LITERAL_SUFFIX
CREATE_PARAMS NULLABLE CASE_SENSITIVE SEARCHABLE
UNSIGNED_ATTRIBUTE MONEY AUTO_INCREMENT LOCAL_TYPE_NAME

MINIMUM_SCALE MAXIMUM_SCALE SQL_DATA_TYPE
SQL_DATETIME_SUB NUM_PREC_RADIX INTERVAL_PRECISION USERTYPE
--------------------------------------------------------------------------------------------------------------------------------
--------- ----------- --------------------------------
-------------------------------- -------------------------------- --------
-------------- ---------- ------------------ ------ --------------
--------------------------------------------------------------------------------------------------------------------------------
------------- ------------- ------------- ----------------
-------------- ------------------ --------
sql_variant
-150 8000
NULL NULL NULL
1 0 2
NULL 0 NULL sql_variant

0 0 -150 NULL
10 NULL 0
uniqueidentifier
-11 36 '
' NULL
1 0 2
NULL 0 NULL uniqueidentifier

NULL NULL -11 NULL
NULL NULL 0
ntext
-10 1073741823
N' ' NULL
1 0 1
NULL 0 NULL ntext

NULL NULL -10 NULL
NULL NULL 0
xml
-10 1073741823
N' ' NULL
1 1 0
NULL 0 NULL xml

NULL NULL -10 NULL
NULL NULL 0
nvarchar
-9 4000
N' ' max
length 1 0 3
NULL 0 NULL nvarchar

NULL NULL -9 NULL
NULL NULL 0
sysname
-9 128
N' ' NULL
0 0 3
NULL 0 NULL sysname

NULL NULL -9 NULL
NULL NULL 18
nchar
-8 4000
N' ' length
1 0 3
NULL 0 NULL nchar

NULL NULL -8 NULL
NULL NULL 0
bit
-7 1
NULL NULL NULL
1 0 2
NULL 0 NULL bit

0 0 -7 NULL
NULL NULL 16
tinyint
-6 3
NULL NULL NULL
1 0 2
1 0 0 tinyint

0 0 -6 NULL
10 NULL 5
tinyint identity
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NULL NULL NULL
0 0 2
1 0 1 tinyint identity

0 0 -6 NULL
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bigint
-5 19
NULL NULL NULL
1 0 2
0 0 0 bigint

0 0 -5 NULL
10 NULL 0
bigint identity
-5 19
NULL NULL NULL
0 0 2
0 0 1 bigint identity

0 0 -5 NULL
10 NULL 0
image
-4 2147483647
0x NULL NULL
1 0 0
NULL 0 NULL image

NULL NULL -4 NULL
NULL NULL 20
varbinary
-3 8000
0x NULL max
length 1 0 2
NULL 0 NULL varbinary

NULL NULL -3 NULL
NULL NULL 4
binary
-2 8000
0x NULL length
1 0 2
NULL 0 NULL binary

NULL NULL -2 NULL
NULL NULL 3
timestamp
-2 8
0x NULL NULL
0 0 2
NULL 0 NULL timestamp

NULL NULL -2 NULL
NULL NULL 80
text
-1 2147483647 '
' NULL
1 0 1
NULL 0 NULL text

NULL NULL -1 NULL
NULL NULL 19
char
1 8000 '
' length
1 0 3
NULL 0 NULL char

NULL NULL 1 NULL
NULL NULL 1
numeric
2 38
NULL NULL
precision,scale 1 0 2
0 0 0 numeric

0 38 2 NULL
10 NULL 10
numeric() identity
2 38
NULL NULL precision
0 0 2
0 0 1 numeric() identity

0 0 2 NULL
10 NULL 10
decimal
3 38
NULL NULL
precision,scale 1 0 2
0 0 0 decimal

0 38 3 NULL
10 NULL 24
money
3 19 $
NULL NULL
1 0 2
0 1 0 money

4 4 3 NULL
10 NULL 11
smallmoney
3 10 $
NULL NULL
1 0 2
0 1 0 smallmoney

4 4 3 NULL
10 NULL 21
decimal() identity
3 38
NULL NULL precision
0 0 2
0 0 1 decimal() identity

0 0 3 NULL
10 NULL 24
int
4 10
NULL NULL NULL
1 0 2
0 0 0 int

0 0 4 NULL
10 NULL 7
int identity
4 10
NULL NULL NULL
0 0 2
0 0 1 int identity

0 0 4 NULL
10 NULL 7
smallint
5 5
NULL NULL NULL
1 0 2
0 0 0 smallint

0 0 5 NULL
10 NULL 6
smallint identity
5 5
NULL NULL NULL
0 0 2
0 0 1 smallint identity

0 0 5 NULL
10 NULL 6
float
6 53
NULL NULL NULL
1 0 2
0 0 0 float

NULL NULL 6 NULL
2 NULL 8
real
7 24
NULL NULL NULL
1 0 2
0 0 0 real

NULL NULL 7 NULL
2 NULL 23
varchar
12 8000 '
' max length
1 0 3
NULL 0 NULL varchar

NULL NULL 12 NULL
NULL NULL 2
datetime
93 23 '
' NULL
1 0 3
NULL 0 NULL datetime

3 3 9 3
NULL NULL 12
smalldatetime
93 16 '
' NULL
1 0 3
NULL 0 NULL smalldatetime

0 0 9 3
NULL NULL 22

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