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IDS Forum

Re: table inheritance question

Posted By: Jonathan Leffler
Date: Wednesday, 28 January 2004, at 8:36 p.m.

In Response To: Re: table inheritance question (Davis Kwong )

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MMUTLANYNE <mojapelo@netscape.net> asked:
>HELP !!!!!
>How does one insert a value into a subtable if the supertable entry
already
>exists.
>
>I have tried looking at the IBM manuals but they only give info on the=

>supertables


Davis Kwong said:

>you can just insert into the subtable directly, even if the supertable=
and
>subtable have identical shapes, for example
>
>> create row type type1 (a int);
>Row type created.
>
>> create table tab1 of type type1;
>Table created.
>
>> create row type type2 under type1;
>Row type created.
>
>> create table tab2 of type type2 under tab1;
>Table created.
>
>> insert into tab1 values (1);
>1 row(s) inserted.
>
>> insert into tab2 values (1);
>1 row(s) inserted.
>
>> select * from tab1;
>
> a
>
> 1
> 1
>
>2 row(s) retrieved.

I suspect that MMUTLANYNE has a primary key on the super-table that
prevents duplicate entries.

I also suspect that the answer is that you have to do a combination of
DELETE from super-table and INSERT into sub-table - in a transaction, o=
f
course. For a single row case - satisfying the criterion WHERE a =3D 1=
, one
might perhaps do:

BEGIN WORK;
SELECT FROM tab1 WHERE a =3D 1 INTO TEMP x;
DELETE FROM tab1 WHERE a =3D 1;
INSERT INTO tab2 SELECT * FROM x;
COMMIT WORK;

Handling more general cases where the sub-type table has more columns t=
han
the super-type would be harder - you'd probably start by selecting noth=
ing
from the sub-table into a temp table (to get the right target table sha=
pe,
then do the cross-load from the super-type table specifying the column
values. At some point, you'd have to set the subtable columns to
appropriate non-null values. Then, finally, you could cross-load from =
the
temp table and commit (or rollback on an error).

In passing, I note that the IDS 9.40 Informix Guide to SQL: Syntax manu=
al
implies (p2-255 of ct1sqna.pdf) that the OF TYPE clause can use..

OF TYPE rowtype ( field-definition-comma-list ,
multi-column-constraint-comma-list ) UNDER supertable

It doesn't say that the field-definition-comma-list (my name for a
non-empty comma-separated list of 'field definitions') can be empty, no=
r
that the constraint list can be empty, which is slightly puzzling, but =
more
significantly, I've been unable to get any notation that includes the
mandatory parentheses - which can nominally be empty - to work. I've t=
ried
a number of semi-plausible constructs, and none of them worked. I fear=

this is a documentation error.

CREATE TABLE t1 OF TYPE type1; -- Non-controversial
CREATE TABLE t2 OF TYPE type2 UNDER t1; -- Worked - but manual says t=
his
should fail (empty parens are necessary before UNDER)
CREATE TABLE t3 OF TYPE type2 ( ) UNDER t2; -- Failed - but manual =
says
the parens should be necessary

I tried a fairly large number of (c INT NOT NULL) and (c INT NOT NULL,
UNIQUE(a, c)) type constructs where the empty parentheses are, and ever=
y
one which tries to add columns comes back -201 syntax error with IDS
9.40.UC1. As Davis pointed out to me when we chatted about this, it
doesn't make sense for a subtable to be able to define additional field=
s.
That subtable is of type 'rowtype' which means that the subtable's colu=
mn
definition is a one-to-one match to the rowtype's field definition. Y=
ou
can (optionally) add a unique constraint, for example. So, the parenth=
eses
in the syntax diagram should be optional (not mandatory), and the
'field-definition-comma-list' should not be part of the syntax. I've
reported this to the docinf@us.ibm.com mailing list, so the documentati=
on
will be updated in due course.

--
Jonathan Leffler (jleffler@us.ibm.com)
STSM, Informix Database Engineering, IBM Data Management
4100 Bohannon Drive, Menlo Park, CA 94025
Tel: +1 650-926-6921 Tie-Line: 630-6921
"I don't suffer from insanity; I enjoy every minute of it!"=

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<html><body>
<p><tt>MMUTLANYNE &lt;mojapelo@netscape.net&gt; asked:<br>
&gt;HELP !!!!!<br>
&gt;How does one insert a value into a subtable if the supertable entry=
already<br>
&gt;exists.<br>
&gt;<br>
&gt;I have tried looking at the IBM manuals but they only give info on =
the<br>
&gt;supertables</tt><br>
<br>
<br>
Davis Kwong said:<br>
<tt><br>
&gt;you can just insert into the subtable directly, even if the superta=
ble and<br>
&gt;subtable have identical shapes, for example<br>
&gt;<br>
&gt;&gt; create row type type1 (a int);<br>
&gt;Row type created.<br>
&gt;<br>
&gt;&gt; create table tab1 of type type1;<br>
&gt;Table created.<br>
&gt;<br>
&gt;&gt; create row type type2 under type1;<br>
&gt;Row type created.<br>
&gt;<br>
&gt;&gt; create table tab2 of type type2 under tab1;<br>
&gt;Table created.<br>
&gt;<br>
&gt;&gt; insert into tab1 values (1);<br>
&gt;1 row(s) inserted.<br>
&gt;<br>
&gt;&gt; insert into tab2 values (1);<br>
&gt;1 row(s) inserted.<br>
&gt;<br>
&gt;&gt; select * from tab1;<br>
&gt;<br>
&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;a<br>
&gt;<br>
&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;1<br>
&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;1<br>
&gt;<br>
&gt;2 row(s) retrieved.<br>
</tt><br>
I suspect that <tt>MMUTLANYNE</tt> has a primary key on the super-table=
that prevents duplicate entries.<br>
<br>
I also suspect that the answer is that you have to do a combination of =
DELETE from super-table and INSERT into sub-table - in a transaction, o=
f course. For a single row case - satisfying the criterion WHERE a =3D=
1, one might perhaps do:
<ul><br>
BEGIN WORK;<br>
SELECT FROM tab1 WHERE a =3D 1 INTO TEMP x;<br>
DELETE FROM tab1 WHERE a =3D 1;<br>
INSERT INTO tab2 SELECT * FROM x;<br>
COMMIT WORK;<br>
</ul>
Handling more general cases where the sub-type table has more columns t=
han the super-type would be harder - you'd probably start by selecting =
nothing from the sub-table into a temp table (to get the right target t=
able shape, then do the cross-load from the super-type table specifying=
the column values. At some point, you'd have to set the subtable colu=
mns to appropriate non-null values. Then, finally, you could cross-loa=
d from the temp table and commit (or rollback on an error).<br>
<br>
In passing, I note that the IDS 9.40 Informix Guide to SQL: Syntax manu=
al implies (p2-255 of ct1sqna.pdf) that the OF TYPE clause can use..<br=
>

<ul>OF TYPE rowtype ( field-definition-comma-list , multi-column-constr=
aint-comma-list ) UNDER supertable</ul>
<br>
It doesn't say that the field-definition-comma-list (my name for a non-=
empty comma-separated list of 'field definitions') can be empty, nor th=
at the constraint list can be empty, which is slightly puzzling, but mo=
re significantly, I've been unable to get any notation that includes th=
e mandatory parentheses - which can nominally be empty - to work. I've=
tried a number of semi-plausible constructs, and none of them worked. =
I fear this is a documentation error.<br>
<br>
CREATE TABLE t1 OF TYPE type1; -- Non-controversial<br>
CREATE TABLE t2 OF TYPE type2 UNDER t1; -- Worked - but manual says thi=
s should fail (empty parens are necessary before UNDER)<br>
CREATE TABLE t3 OF TYPE type2 ( ) UNDER t2; -- Failed - but manual says=
the parens should be necessary<br>
<br>
I tried a fairly large number of (c INT NOT NULL) and (c INT NOT NULL, =
UNIQUE(a, c)) type constructs where the empty parentheses are, and ever=
y one which tries to add columns comes back -201 syntax error with IDS =
9.40.UC1. As Davis pointed out to me when we chatted about this, it do=
esn't make sense for a subtable to be able to define additional fields.=
That subtable is of type 'rowtype' which means that the subtable's col=
umn definition is a one-to-one match to the rowtype's field definition=
. You can (optionally) add a unique constraint, for example. So, the =
parentheses in the syntax diagram should be optional (not mandatory), a=
nd the 'field-definition-comma-list' should not be part of the syntax. =
I've reported this to the docinf@us.ibm.com mailing list, so the docum=
entation will be updated in due course.<br>
<br>
--<br>
Jonathan Leffler (jleffler@us.ibm.com)<br>
STSM, Informix Database Engineering, IBM Data Management<br>
4100 Bohannon Drive, Menlo Park, CA 94025<br>
Tel: +1 650-926-6921 Tie-Line: 630-6921<br>
&quot;I don't suffer from insanity; I enjoy every minute of it!&q=
uot;<br>
</body></html>=

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