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Postgres FD Implementation
Commit 65a0db19 authored by Bruce Momjian's avatar Bruce Momjian
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Add new SPI functions for use by PL/Java: 

	+extern Oid SPI_getargtypeid(void *plan, int argIndex);
	+extern int SPI_getargcount(void *plan);
	+extern bool SPI_is_cursor_plan(void *plan);

Thomas Hallgren
parent 202cbdca
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Showing with 250 additions and 3 deletions
doc/src/sgml/spi.sgml
View file @ 65a0db19
<!--
$PostgreSQL: pgsql/doc/src/sgml/spi.sgml,v 1.30 2003/12/01 22:07:57 momjian Exp $
$PostgreSQL: pgsql/doc/src/sgml/spi.sgml,v 1.31 2004/03/05 00:47:01 momjian Exp $
-->
<chapter id="spi">
......@@ -573,6 +573,190 @@ void * SPI_prepare(const char * <parameter>command</parameter>, int <parameter>n
<!-- *********************************************** -->
<refentry id="spi-spi-getargcount">
<refmeta>
<refentrytitle>SPI_getargcount</refentrytitle>
</refmeta>
<refnamediv>
<refname>SPI_getargcount</refname>
<refpurpose>returns the number of arguments needed when executing a plan
prepared by <function>SPI_prepare</function></refpurpose>
</refnamediv>
<indexterm><primary>SPI_getargcount</primary></indexterm>
<refsynopsisdiv>
<synopsis>
int SPI_getargcount(void * <parameter>plan</parameter>)
</synopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<function>SPI_getargcount</function> returns the number of arguments needed
when executing a plan prepared by <function>SPI_prepare</function>.
</para>
</refsect1>
<refsect1>
<title>Arguments</title>
<variablelist>
<varlistentry>
<term><literal>void * <parameter>plan</parameter></literal></term>
<listitem>
<para>
execution plan (returned by <function>SPI_prepare</function>)
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Return Value</title>
<para>
The expected argument count for the <parameter>plan</parameter> or
<symbol>SPI_ERROR_ARGUMENT</symbol> if the <parameter>plan
</parameter> is <symbol>NULL</symbol>
</para>
</refsect1>
</refentry>
<!-- *********************************************** -->
<refentry id="spi-spi-getargtypeid">
<refmeta>
<refentrytitle>SPI_getargtypeid</refentrytitle>
</refmeta>
<refnamediv>
<refname>SPI_getargtypeid</refname>
<refpurpose>returns the expected typeid for the specified argument when
executing a plan prepared by <function>SPI_prepare</function></refpurpose>
</refnamediv>
<indexterm><primary>SPI_getargtypeid</primary></indexterm>
<refsynopsisdiv>
<synopsis>
Oid SPI_getargtypeid(void * <parameter>plan</parameter>, int <parameter>argIndex</parameter>)
</synopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<function>SPI_getargtypeid</function> returns the Oid representing the type
id for argument at <parameter>argIndex</parameter> in a plan prepared by
<function>SPI_prepare</function>. First argument is at index zero.
</para>
</refsect1>
<refsect1>
<title>Arguments</title>
<variablelist>
<varlistentry>
<term><literal>void * <parameter>plan</parameter></literal></term>
<listitem>
<para>
execution plan (returned by <function>SPI_prepare</function>)
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>int <parameter>argIndex</parameter></literal></term>
<listitem>
<para>
zero based index of the argument
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Return Value</title>
<para>
The type id of the argument at the given index or <symbol>
SPI_ERROR_ARGUMENT</symbol> if the <parameter>plan</parameter> is
<symbol>NULL</symbol> or <parameter>argIndex</parameter> is less than 0 or
not less than the number of arguments declared for the <parameter>plan
</parameter>
</para>
</refsect1>
</refentry>
<!-- *********************************************** -->
<refentry id="spi-spi-is_cursor_plan">
<refmeta>
<refentrytitle>SPI_is_cursor_plan</refentrytitle>
</refmeta>
<refnamediv>
<refname>SPI_is_cursor_plan</refname>
<refpurpose>returns <symbol>true</symbol> if a plan
prepared by <function>SPI_prepare</function> can be passed
as an argument to <function>SPI_cursor_open</function></refpurpose>
</refnamediv>
<indexterm><primary>SPI_is_cursor_plan</primary></indexterm>
<refsynopsisdiv>
<synopsis>
bool SPI_is_cursor_plan(void * <parameter>plan</parameter>)
</synopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<function>SPI_is_cursor_plan</function> returns <symbol>true</symbol>
if a plan prepared by <function>SPI_prepare</function> can be passed
as an argument to <function>SPI_cursor_open</function> and <symbol>
false</symbol> if that is not the case. The criteria is that the
<parameter>plan</parameter> represents one single command and that this
command is a <command>SELECT</command> without an <command>INTO</command>
clause.
</para>
</refsect1>
<refsect1>
<title>Arguments</title>
<variablelist>
<varlistentry>
<term><literal>void * <parameter>plan</parameter></literal></term>
<listitem>
<para>
execution plan (returned by <function>SPI_prepare</function>)
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Return Value</title>
<para>
<symbol>true</symbol> or <symbol>false</symbol> to indicate if the
<parameter>plan</parameter> can produce a cursor or not, or
<symbol>SPI_ERROR_ARGUMENT</symbol> if the <parameter>plan</parameter>
is <symbol>NULL</symbol>
</para>
</refsect1>
</refentry>
<!-- *********************************************** -->
<refentry id="spi-spi-execp">
<refmeta>
<refentrytitle>SPI_execp</refentrytitle>
......
src/backend/executor/spi.c
View file @ 65a0db19
......@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/spi.c,v 1.109 2003/12/02 19:26:47 joe Exp $
* $PostgreSQL: pgsql/src/backend/executor/spi.c,v 1.110 2004/03/05 00:47:01 momjian Exp $
*
*-------------------------------------------------------------------------
*/
......@@ -918,6 +918,65 @@ SPI_cursor_close(Portal portal)
PortalDrop(portal, false);
}
/*
* Returns the Oid representing the type id for argument at argIndex. First
* parameter is at index zero.
*/
Oid
SPI_getargtypeid(void *plan, int argIndex)
{
if (plan == NULL || argIndex < 0 || argIndex >= ((_SPI_plan*)plan)->nargs)
{
SPI_result = SPI_ERROR_ARGUMENT;
return InvalidOid;
}
return ((_SPI_plan *) plan)->argtypes[argIndex];
}
/*
* Returns the number of arguments for the prepared plan.
*/
int
SPI_getargcount(void *plan)
{
if (plan == NULL)
{
SPI_result = SPI_ERROR_ARGUMENT;
return -1;
}
return ((_SPI_plan *) plan)->nargs;
}
/*
* Returns true if the plan contains exactly one command
* and that command originates from normal SELECT (i.e.
* *not* a SELECT ... INTO). In essence, the result indicates
* if the command can be used with SPI_cursor_open
*
* Parameters
* plan A plan previously prepared using SPI_prepare
*/
bool
SPI_is_cursor_plan(void *plan)
{
List *qtlist;
_SPI_plan *spiplan = (_SPI_plan *) plan;
if (spiplan == NULL)
{
SPI_result = SPI_ERROR_ARGUMENT;
return false;
}
qtlist = spiplan->qtlist;
if(length(spiplan->ptlist) == 1 && length(qtlist) == 1)
{
Query *queryTree = (Query *) lfirst((List *) lfirst(qtlist));
if(queryTree->commandType == CMD_SELECT && queryTree->into == NULL)
return true;
}
return false;
}
/* =================== private functions =================== */
/*
......
src/include/executor/spi.h
View file @ 65a0db19
......@@ -2,7 +2,7 @@
*
* spi.h
*
* $PostgreSQL: pgsql/src/include/executor/spi.h,v 1.41 2003/12/02 19:26:47 joe Exp $
* $PostgreSQL: pgsql/src/include/executor/spi.h,v 1.42 2004/03/05 00:47:01 momjian Exp $
*
*-------------------------------------------------------------------------
*/
......@@ -90,6 +90,10 @@ extern void *SPI_prepare(const char *src, int nargs, Oid *argtypes);
extern void *SPI_saveplan(void *plan);
extern int SPI_freeplan(void *plan);
extern Oid SPI_getargtypeid(void *plan, int argIndex);
extern int SPI_getargcount(void *plan);
extern bool SPI_is_cursor_plan(void *plan);
extern HeapTuple SPI_copytuple(HeapTuple tuple);
extern TupleDesc SPI_copytupledesc(TupleDesc tupdesc);
extern TupleTableSlot *SPI_copytupleintoslot(HeapTuple tuple,
......
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