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Avoid unnecessary copying of parameter values in BIND. This allows

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efficient insertion of large bytea values through the BIND interface.
This commit is contained in:
Tom Lane 2003-05-12 16:48:17 +00:00
parent d97c9b3662
commit b02832719c
1 changed files with 27 additions and 19 deletions
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46
src/backend/tcop/postgres.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.342 2003/05/09 18:08:48 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.343 2003/05/12 16:48:17 tgl Exp $
*
* NOTES
* this is the "main" module of the postgres backend and
@ -1265,13 +1265,9 @@ exec_bind_message(StringInfo input_message)
if (numParams > 0)
{
bool isaborted = IsAbortedTransactionBlockState();
StringInfoData pbuf;
List *l;
MemoryContext oldContext;
/* Note that the string buffer lives in MessageContext */
initStringInfo(&pbuf);
oldContext = MemoryContextSwitchTo(PortalGetHeapMemory(portal));
params = (ParamListInfo)
@ -1289,14 +1285,7 @@ exec_bind_message(StringInfo input_message)
if (!isNull)
{
/* Reset pbuf to empty, and insert raw data into it */
pbuf.len = 0;
pbuf.data[0] = '\0';
pbuf.cursor = 0;
appendBinaryStringInfo(&pbuf,
pq_getmsgbytes(input_message, plength),
plength);
const char *pvalue = pq_getmsgbytes(input_message, plength);
if (isaborted)
{
@ -1306,6 +1295,8 @@ exec_bind_message(StringInfo input_message)
else
{
int16 pformat;
StringInfoData pbuf;
char csave;
if (numPFormats > 1)
pformat = pformats[i];
@ -1314,6 +1305,23 @@ exec_bind_message(StringInfo input_message)
else
pformat = 0; /* default = text */
/*
* Rather than copying data around, we just set up a phony
* StringInfo pointing to the correct portion of the
* message buffer. We assume we can scribble on the
* message buffer so as to maintain the convention that
* StringInfos have a trailing null. This is grotty but
* is a big win when dealing with very large parameter
* strings.
*/
pbuf.data = (char *) pvalue;
pbuf.maxlen = plength + 1;
pbuf.len = plength;
pbuf.cursor = 0;
csave = pbuf.data[plength];
pbuf.data[plength] = '\0';
if (pformat == 0)
{
Oid typInput;
@ -1322,11 +1330,8 @@ exec_bind_message(StringInfo input_message)
getTypeInputInfo(ptype, &typInput, &typElem);
/*
* Since stringinfo.c keeps a trailing null in
* place even for binary data, the contents of
* pbuf are a valid C string. We have to do
* encoding conversion before calling the typinput
* routine, though.
* We have to do encoding conversion before calling
* the typinput routine.
*/
pstring = (char *)
pg_client_to_server((unsigned char *) pbuf.data,
@ -1362,6 +1367,9 @@ exec_bind_message(StringInfo input_message)
{
elog(ERROR, "Invalid format code %d", pformat);
}
/* Restore message buffer contents */
pbuf.data[plength] = csave;
}
}
@ -2524,7 +2532,7 @@ PostgresMain(int argc, char *argv[], const char *username)
if (!IsUnderPostmaster)
{
puts("\nPOSTGRES backend interactive interface ");
puts("$Revision: 1.342 $ $Date: 2003/05/09 18:08:48 $\n");
puts("$Revision: 1.343 $ $Date: 2003/05/12 16:48:17 $\n");
}
/*