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Return the number of rows processed when COPY is executed through SPI.

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You can now get the number of rows processed by a COPY statement in a
PL/pgSQL function with "GET DIAGNOSTICS x = ROW_COUNT".

Pavel Stehule, reviewed by Amit Kapila, with some editing by me.
This commit is contained in:
Heikki Linnakangas 2012-10-03 14:32:01 +03:00
parent bc1229c832
commit 7ae1815961
2 changed files with 19 additions and 10 deletions
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5
doc/src/sgml/spi.sgml
View File

@ -377,7 +377,10 @@ SPI_execute("INSERT INTO foo SELECT * FROM bar", false, 5);
global pointer <literal>SPITupleTable *SPI_tuptable</literal> to
access the result rows. Some utility commands (such as
<command>EXPLAIN</>) also return row sets, and <literal>SPI_tuptable</>
will contain the result in these cases too.
will contain the result in these cases too. Some utility commands
(<command>COPY</>, <command>CREATE TABLE AS</>) don't return a row set, so
<literal>SPI_tuptable</> is NULL, but they still return the number of
rows processed in <varname>SPI_processed</>.
</para>
<para>

24
src/backend/executor/spi.c
View File

@ -1922,25 +1922,31 @@ _SPI_execute_plan(SPIPlanPtr plan, ParamListInfo paramLI,
_SPI_current->processed = _SPI_current->tuptable->alloced -
_SPI_current->tuptable->free;
res = SPI_OK_UTILITY;
/*
* CREATE TABLE AS is a messy special case for historical
* reasons. We must set _SPI_current->processed even though
* the tuples weren't returned to the caller, and we must
* return a special result code if the statement was spelled
* SELECT INTO.
* Some utility statements return a row count, even though the
* tuples are not returned to the caller.
*/
if (IsA(stmt, CreateTableAsStmt))
{
Assert(strncmp(completionTag, "SELECT ", 7) == 0);
_SPI_current->processed = strtoul(completionTag + 7,
NULL, 10);
/*
* For historical reasons, if CREATE TABLE AS was spelled
* as SELECT INTO, return a special return code.
*/
if (((CreateTableAsStmt *) stmt)->is_select_into)
res = SPI_OK_SELINTO;
else
res = SPI_OK_UTILITY;
}
else
res = SPI_OK_UTILITY;
else if (IsA(stmt, CopyStmt))
{
Assert(strncmp(completionTag, "COPY ", 5) == 0);
_SPI_current->processed = strtoul(completionTag + 5,
NULL, 10);
}
}
/*