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Extended query protocol: parse, bind, execute, describe FE/BE messages.

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Only lightly tested as yet, since libpq doesn't know anything about 'em.
This commit is contained in:
Tom Lane
2003-05-05 00:44:56 +00:00
parent a59793f82c
commit 16503e6fa4
17 changed files with 1336 additions and 268 deletions
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84
src/backend/access/common/printtup.c
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@ -9,7 +9,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/common/printtup.c,v 1.67 2003/04/26 20:22:58 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/access/common/printtup.c,v 1.68 2003/05/05 00:44:55 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -48,6 +48,7 @@ typedef struct
typedef struct
{
DestReceiver pub; /* publicly-known function pointers */
bool sendDescrip; /* send RowDescription at startup? */
TupleDesc attrinfo; /* The attr info we are set up for */
int nattrs;
PrinttupAttrInfo *myinfo; /* Cached info about each attr */
@ -58,7 +59,7 @@ typedef struct
* ----------------
*/
DestReceiver *
printtup_create_DR(bool isBinary)
printtup_create_DR(bool isBinary, bool sendDescrip)
{
DR_printtup *self = (DR_printtup *) palloc(sizeof(DR_printtup));
@ -66,6 +67,8 @@ printtup_create_DR(bool isBinary)
self->pub.setup = printtup_setup;
self->pub.cleanup = printtup_cleanup;
self->sendDescrip = sendDescrip;
self->attrinfo = NULL;
self->nattrs = 0;
self->myinfo = NULL;
@ -77,6 +80,8 @@ static void
printtup_setup(DestReceiver *self, int operation,
const char *portalName, TupleDesc typeinfo)
{
DR_printtup *myState = (DR_printtup *) self;
if (PG_PROTOCOL_MAJOR(FrontendProtocol) < 3)
{
/*
@ -91,41 +96,11 @@ printtup_setup(DestReceiver *self, int operation,
}
/*
* if this is a retrieve, then we send back the tuple descriptor of
* the tuples.
* If this is a retrieve, and we are supposed to emit row descriptions,
* then we send back the tuple descriptor of the tuples.
*/
if (operation == CMD_SELECT)
{
Form_pg_attribute *attrs = typeinfo->attrs;
int natts = typeinfo->natts;
int proto = PG_PROTOCOL_MAJOR(FrontendProtocol);
int i;
StringInfoData buf;
pq_beginmessage(&buf, 'T'); /* tuple descriptor message type */
pq_sendint(&buf, natts, 2); /* # of attrs in tuples */
for (i = 0; i < natts; ++i)
{
pq_sendstring(&buf, NameStr(attrs[i]->attname));
/* column ID info appears in protocol 3.0 and up */
if (proto >= 3)
{
/* XXX not yet implemented, send zeroes */
pq_sendint(&buf, 0, 4);
pq_sendint(&buf, 0, 2);
}
pq_sendint(&buf, (int) attrs[i]->atttypid,
sizeof(attrs[i]->atttypid));
pq_sendint(&buf, attrs[i]->attlen,
sizeof(attrs[i]->attlen));
/* typmod appears in protocol 2.0 and up */
if (proto >= 2)
pq_sendint(&buf, attrs[i]->atttypmod,
sizeof(attrs[i]->atttypmod));
}
pq_endmessage(&buf);
}
if (operation == CMD_SELECT && myState->sendDescrip)
SendRowDescriptionMessage(typeinfo);
/* ----------------
* We could set up the derived attr info at this time, but we postpone it
@ -139,6 +114,43 @@ printtup_setup(DestReceiver *self, int operation,
*/
}
/*
* SendRowDescriptionMessage --- send a RowDescription message to the frontend
*/
void
SendRowDescriptionMessage(TupleDesc typeinfo)
{
Form_pg_attribute *attrs = typeinfo->attrs;
int natts = typeinfo->natts;
int proto = PG_PROTOCOL_MAJOR(FrontendProtocol);
int i;
StringInfoData buf;
pq_beginmessage(&buf, 'T'); /* tuple descriptor message type */
pq_sendint(&buf, natts, 2); /* # of attrs in tuples */
for (i = 0; i < natts; ++i)
{
pq_sendstring(&buf, NameStr(attrs[i]->attname));
/* column ID info appears in protocol 3.0 and up */
if (proto >= 3)
{
/* XXX not yet implemented, send zeroes */
pq_sendint(&buf, 0, 4);
pq_sendint(&buf, 0, 2);
}
pq_sendint(&buf, (int) attrs[i]->atttypid,
sizeof(attrs[i]->atttypid));
pq_sendint(&buf, attrs[i]->attlen,
sizeof(attrs[i]->attlen));
/* typmod appears in protocol 2.0 and up */
if (proto >= 2)
pq_sendint(&buf, attrs[i]->atttypmod,
sizeof(attrs[i]->atttypmod));
}
pq_endmessage(&buf);
}
static void
printtup_prepare_info(DR_printtup *myState, TupleDesc typeinfo, int numAttrs)
{