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f4b54e1ed9
This commit introduces descriptively-named macros for the identifiers used in wire protocol messages. These new macros are placed in a new header file so that they can be easily used by third-party code. Author: Dave Cramer Reviewed-by: Alvaro Herrera, Tatsuo Ishii, Peter Smith, Robert Haas, Tom Lane, Peter Eisentraut, Michael Paquier Discussion: https://postgr.es/m/CADK3HHKbBmK-PKf1bPNFoMC%2BoBt%2BpD9PH8h5nvmBQskEHm-Ehw%40mail.gmail.com
145 lines
3.3 KiB
C
145 lines
3.3 KiB
C
/*-------------------------------------------------------------------------
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*
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* printsimple.c
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* Routines to print out tuples containing only a limited range of
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* builtin types without catalog access. This is intended for
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* backends that don't have catalog access because they are not bound
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* to a specific database, such as some walsender processes. It
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* doesn't handle standalone backends or protocol versions other than
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* 3.0, because we don't need such handling for current applications.
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*
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* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* src/backend/access/common/printsimple.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/printsimple.h"
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#include "catalog/pg_type.h"
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#include "libpq/protocol.h"
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#include "libpq/pqformat.h"
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#include "utils/builtins.h"
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/*
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* At startup time, send a RowDescription message.
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*/
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void
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printsimple_startup(DestReceiver *self, int operation, TupleDesc tupdesc)
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{
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StringInfoData buf;
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int i;
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pq_beginmessage(&buf, PqMsg_RowDescription);
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pq_sendint16(&buf, tupdesc->natts);
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for (i = 0; i < tupdesc->natts; ++i)
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{
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Form_pg_attribute attr = TupleDescAttr(tupdesc, i);
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pq_sendstring(&buf, NameStr(attr->attname));
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pq_sendint32(&buf, 0); /* table oid */
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pq_sendint16(&buf, 0); /* attnum */
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pq_sendint32(&buf, (int) attr->atttypid);
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pq_sendint16(&buf, attr->attlen);
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pq_sendint32(&buf, attr->atttypmod);
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pq_sendint16(&buf, 0); /* format code */
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}
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pq_endmessage(&buf);
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}
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/*
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* For each tuple, send a DataRow message.
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*/
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bool
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printsimple(TupleTableSlot *slot, DestReceiver *self)
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{
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TupleDesc tupdesc = slot->tts_tupleDescriptor;
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StringInfoData buf;
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int i;
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/* Make sure the tuple is fully deconstructed */
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slot_getallattrs(slot);
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/* Prepare and send message */
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pq_beginmessage(&buf, PqMsg_DataRow);
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pq_sendint16(&buf, tupdesc->natts);
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for (i = 0; i < tupdesc->natts; ++i)
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{
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Form_pg_attribute attr = TupleDescAttr(tupdesc, i);
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Datum value;
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if (slot->tts_isnull[i])
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{
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pq_sendint32(&buf, -1);
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continue;
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}
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value = slot->tts_values[i];
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/*
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* We can't call the regular type output functions here because we
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* might not have catalog access. Instead, we must hard-wire
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* knowledge of the required types.
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*/
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switch (attr->atttypid)
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{
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case TEXTOID:
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{
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text *t = DatumGetTextPP(value);
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pq_sendcountedtext(&buf,
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VARDATA_ANY(t),
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VARSIZE_ANY_EXHDR(t),
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false);
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}
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break;
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case INT4OID:
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{
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int32 num = DatumGetInt32(value);
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char str[12]; /* sign, 10 digits and '\0' */
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int len;
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len = pg_ltoa(num, str);
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pq_sendcountedtext(&buf, str, len, false);
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}
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break;
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case INT8OID:
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{
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int64 num = DatumGetInt64(value);
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char str[MAXINT8LEN + 1];
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int len;
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len = pg_lltoa(num, str);
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pq_sendcountedtext(&buf, str, len, false);
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}
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break;
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case OIDOID:
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{
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Oid num = ObjectIdGetDatum(value);
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char str[10]; /* 10 digits */
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int len;
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len = pg_ultoa_n(num, str);
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pq_sendcountedtext(&buf, str, len, false);
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}
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break;
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default:
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elog(ERROR, "unsupported type OID: %u", attr->atttypid);
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}
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}
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pq_endmessage(&buf);
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return true;
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}
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