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Implement array_send/array_recv (binary I/O for arrays). This exposed

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the folly of not passing element type to typsend/typreceive, so fix that.
This commit is contained in:
Tom Lane
2003-05-09 23:01:45 +00:00
parent b1ee615a7f
commit ba1e066e46
7 changed files with 316 additions and 35 deletions
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19
doc/src/sgml/ref/create_type.sgml
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@@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_type.sgml,v 1.42 2003/05/08 22:19:56 tgl Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_type.sgml,v 1.43 2003/05/09 23:01:44 tgl Exp $
PostgreSQL documentation
-->
@@ -117,15 +117,20 @@ CREATE TYPE <replaceable class="parameter">typename</replaceable> (
representation is in the machine's native byte order.) The receive
function should perform adequate checking to ensure that the value is
valid.
The receive function should be declared as taking one argument of type
<type>internal</type> and returning a value of the data type itself.
(The argument actually supplied is a pointer to a StringInfo buffer
holding the received byte string.) Similarly, the optional
The receive function may be declared as taking one argument of type
<type>internal</type>, or two arguments of types <type>internal</type>
and <type>oid</type>. It must return a value of the data type itself.
(The first argument is a pointer to a StringInfo buffer
holding the received byte string; the optional second argument is the
element type in case this is an array type.) Similarly, the optional
<replaceable class="parameter">send_function</replaceable> converts
from the internal representation to the external binary representation.
If this function is not supplied, the type cannot participate in binary
output. The send function should be declared as taking one argument of the
new data type and returning type <type>bytea</type>.
output. The send function may be
declared as taking one argument of the new data type, or as taking
two arguments of which the second is type <type>oid</type>.
The second argument is again the array element type for array types.
The send function must return type <type>bytea</type>.
</para>
<para>