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Support assignment to subfields of composite columns in UPDATE and INSERT.

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As a side effect, cause subscripts in INSERT targetlists to do something
more or less sensible; previously we evaluated such subscripts and then
effectively ignored them.  Another side effect is that UPDATE-ing an
element or slice of an array value that is NULL now produces a non-null
result, namely an array containing just the assigned-to positions.
This commit is contained in:
Tom Lane
2004-06-09 19:08:20 +00:00
parent 3a0df651da
commit 7e64dbc6b5
27 changed files with 1468 additions and 574 deletions
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13
doc/src/sgml/ref/insert.sgml
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@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/insert.sgml,v 1.26 2003/11/29 19:51:39 pgsql Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/insert.sgml,v 1.27 2004/06/09 19:08:13 tgl Exp $
PostgreSQL documentation
-->
@ -73,6 +73,9 @@ INSERT INTO <replaceable class="PARAMETER">table</replaceable> [ ( <replaceable
<listitem>
<para>
The name of a column in <replaceable class="PARAMETER">table</replaceable>.
The column name can be qualified with a subfield name or array
subscript, if needed. (Inserting into only some fields of a
composite column leaves the other fields null.)
</para>
</listitem>
</varlistentry>
@ -184,13 +187,11 @@ INSERT INTO films SELECT * FROM tmp;
<programlisting>
-- Create an empty 3x3 gameboard for noughts-and-crosses
-- (all of these commands create the same board)
-- (these commands create the same board)
INSERT INTO tictactoe (game, board[1:3][1:3])
VALUES (1,'{{"","",""},{},{"",""}}');
INSERT INTO tictactoe (game, board[3][3])
VALUES (2,'{}');
VALUES (1,'{{"","",""},{"","",""},{"","",""}}');
INSERT INTO tictactoe (game, board)
VALUES (3,'{{,,},{,,},{,,}}');
VALUES (2,'{{,,},{,,},{,,}}');
</programlisting>
</para>
</refsect1>