rdb$field_sub_type for numeric computed column
----------------------------------------------
Key: DNET-423
URL: http://tracker.firebirdsql.org/browse/DNET-423
Project: .NET Data provider
Issue Type: Bug
Components: ADO.NET Provider
Affects Versions: 2.7
Reporter: Jiri Cincura
Assignee: Jiri Cincura
Priority: Minor
Directly from my thread "Wrong rdb$field_sub_type for numeric computed column"
in firebird-devel:
===
have a table:
recreate table test (
base numeric(15,4),
test1 computed by (base+base),
test2 computed by (cast(base+base as numeric(15,4))),
foo bigint,
bar numeric(15,4)
);
If I run the query:
select rf.RDB$FIELD_NAME, f.RDB$FIELD_SCALE, f.RDB$FIELD_TYPE,
f.RDB$FIELD_SUB_TYPE
from RDB$RELATION_FIELDS rf inner join RDB$FIELDS f on
(rf.RDB$FIELD_SOURCE = f.RDB$FIELD_NAME)
where rf.RDB$RELATION_NAME = 'TEST'
it reports:
BASE -4 16 1
TEST1 -4 16 0
TEST2 -4 16 1
FOO 0 16 0
BAR -4 16 1
Why is rdb$field_sub_type for test1 column "0"? Then it looks like
bigint. Checking the rdb$field_scale could be a solution, but is it
then numeric or decimal?
===
I'm happy with conclusion that if field_scale is < 0 and no particular
sub_type, imply i.e. numeric. Probably somebody from core devs should
tell us.
===
That is what is done in Jaybird right now.
See getDataType(...) and getDataTypeName(...) in
http://firebird.cvs.sourceforge.net/viewvc/firebird/client-java/src/main/org/firebirdsql/jdbc/AbstractDatabaseMetaData.java?view=markup
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