psql: Show all query results by default

Previously, psql printed only the last result if a command string
returned multiple result sets.  Now it prints all of them.  The
previous behavior can be obtained by setting the psql variable
SHOW_ALL_RESULTS to off.

Author: Fabien COELHO <coelho@cri.ensmp.fr>
Reviewed-by: "Iwata, Aya" <iwata.aya@jp.fujitsu.com>
Reviewed-by: Daniel Verite <daniel@manitou-mail.org>
Reviewed-by: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
Reviewed-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Reviewed-by: vignesh C <vignesh21@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/alpine.DEB.2.21.1904132231510.8961@lancre

contrib/pg_stat_statements/expected/pg_stat_statements.out

@@ -50,8 +50,28 @@ BEGIN \;
 SELECT 2.0 AS "float" \;
 SELECT 'world' AS "text" \;
 COMMIT;
+ float 
+-------
+   2.0
+(1 row)
+
+ text  
+-------
+ world
+(1 row)
+
 -- compound with empty statements and spurious leading spacing
 \;\;   SELECT 3 + 3 \;\;\;   SELECT ' ' || ' !' \;\;   SELECT 1 + 4 \;;
+ ?column? 
+----------
+        6
+(1 row)
+
+ ?column? 
+----------
+   !
+(1 row)
+
  ?column? 
 ----------
         5
@@ -61,6 +81,11 @@ COMMIT;
 SELECT 1 + 1 + 1 AS "add" \gset
 SELECT :add + 1 + 1 AS "add" \;
 SELECT :add + 1 + 1 AS "add" \gset
+ add 
+-----
+   5
+(1 row)
+
 -- set operator
 SELECT 1 AS i UNION SELECT 2 ORDER BY i;
  i 

doc/src/sgml/ref/psql-ref.sgml

@@ -127,18 +127,11 @@ echo '\x \\ SELECT * FROM foo;' | psql
        commands included in the string to divide it into multiple
        transactions.  (See <xref linkend="protocol-flow-multi-statement"/>
        for more details about how the server handles multi-query strings.)
-       Also, <application>psql</application> only prints the
-       result of the last <acronym>SQL</acronym> command in the string.
-       This is different from the behavior when the same string is read from
-       a file or fed to <application>psql</application>'s standard input,
-       because then <application>psql</application> sends
-       each <acronym>SQL</acronym> command separately.
       </para>
       <para>
-       Because of this behavior, putting more than one SQL command in a
+       If having several commands executed in one transaction is not desired, 
-       single <option>-c</option> string often has unexpected results.
+       use repeated <option>-c</option> commands or feed multiple commands to
-       It's better to use repeated <option>-c</option> commands or feed
+       <application>psql</application>'s standard input,
-       multiple commands to <application>psql</application>'s standard input,
        either using <application>echo</application> as illustrated above, or
        via a shell here-document, for example:
 <programlisting>
@@ -3527,10 +3520,6 @@ select 1\; select 2\; select 3;
         commands included in the string to divide it into multiple
         transactions.  (See <xref linkend="protocol-flow-multi-statement"/>
         for more details about how the server handles multi-query strings.)
-        <application>psql</application> prints only the last query result
-        it receives for each request; in this example, although all
-        three <command>SELECT</command>s are indeed executed, <application>psql</application>
-        only prints the <literal>3</literal>.
         </para>
         </listitem>
       </varlistentry>
@@ -4116,6 +4105,18 @@ bar
         </listitem>
       </varlistentry>
 
+      <varlistentry>
+        <term><varname>SHOW_ALL_RESULTS</varname></term>
+        <listitem>
+        <para>
+        When this variable is set to <literal>off</literal>, only the last
+        result of a combined query (<literal>\;</literal>) is shown instead of
+        all of them.  The default is <literal>on</literal>.  The off behavior
+        is for compatibility with older versions of psql.
+        </para>
+        </listitem>
+      </varlistentry>
+
        <varlistentry>
         <term><varname>SHOW_CONTEXT</varname></term>
         <listitem>

src/bin/psql/common.c

@@ -33,6 +33,7 @@ static bool DescribeQuery(const char *query, double *elapsed_msec);
 static bool ExecQueryUsingCursor(const char *query, double *elapsed_msec);
 static bool command_no_begin(const char *query);
 static bool is_select_command(const char *query);
+static int SendQueryAndProcessResults(const char *query, double *pelapsed_msec, bool is_watch);
 
 
 /*
@@ -353,7 +354,7 @@ CheckConnection(void)
  * Returns true for valid result, false for error state.
  */
 static bool
-AcceptResult(const PGresult *result)
+AcceptResult(const PGresult *result, bool show_error)
 {
 	bool		OK;
 
@@ -384,7 +385,7 @@ AcceptResult(const PGresult *result)
 				break;
 		}
 
-	if (!OK)
+	if (!OK && show_error)
 	{
 		const char *error = PQerrorMessage(pset.db);
 
@@ -472,6 +473,18 @@ ClearOrSaveResult(PGresult *result)
 	}
 }
 
+/*
+ * Consume all results
+ */
+static void
+ClearOrSaveAllResults()
+{
+	PGresult	*result;
+
+	while ((result = PQgetResult(pset.db)) != NULL)
+		ClearOrSaveResult(result);
+}
+
 
 /*
  * Print microtiming output.  Always print raw milliseconds; if the interval
@@ -572,7 +585,7 @@ PSQLexec(const char *query)
 
 	ResetCancelConn();
 
-	if (!AcceptResult(res))
+	if (!AcceptResult(res, true))
 	{
 		ClearOrSaveResult(res);
 		res = NULL;
@@ -594,10 +607,8 @@ PSQLexec(const char *query)
 int
 PSQLexecWatch(const char *query, const printQueryOpt *opt)
 {
-	PGresult   *res;
 	double		elapsed_msec = 0;
-	instr_time	before;
+	int			res;
-	instr_time	after;
 
 	if (!pset.db)
 	{
@@ -606,75 +617,16 @@ PSQLexecWatch(const char *query, const printQueryOpt *opt)
 	}
 
 	SetCancelConn(pset.db);
-
+	res = SendQueryAndProcessResults(query, &elapsed_msec, true);
-	if (pset.timing)
-		INSTR_TIME_SET_CURRENT(before);
-
-	res = PQexec(pset.db, query);
-
 	ResetCancelConn();
 
-	if (!AcceptResult(res))
-	{
-		ClearOrSaveResult(res);
-		return 0;
-	}
-
-	if (pset.timing)
-	{
-		INSTR_TIME_SET_CURRENT(after);
-		INSTR_TIME_SUBTRACT(after, before);
-		elapsed_msec = INSTR_TIME_GET_MILLISEC(after);
-	}
-
-	/*
-	 * If SIGINT is sent while the query is processing, the interrupt will be
-	 * consumed.  The user's intention, though, is to cancel the entire watch
-	 * process, so detect a sent cancellation request and exit in this case.
-	 */
-	if (cancel_pressed)
-	{
-		PQclear(res);
-		return 0;
-	}
-
-	switch (PQresultStatus(res))
-	{
-		case PGRES_TUPLES_OK:
-			printQuery(res, opt, pset.queryFout, false, pset.logfile);
-			break;
-
-		case PGRES_COMMAND_OK:
-			fprintf(pset.queryFout, "%s\n%s\n\n", opt->title, PQcmdStatus(res));
-			break;
-
-		case PGRES_EMPTY_QUERY:
-			pg_log_error("\\watch cannot be used with an empty query");
-			PQclear(res);
-			return -1;
-
-		case PGRES_COPY_OUT:
-		case PGRES_COPY_IN:
-		case PGRES_COPY_BOTH:
-			pg_log_error("\\watch cannot be used with COPY");
-			PQclear(res);
-			return -1;
-
-		default:
-			pg_log_error("unexpected result status for \\watch");
-			PQclear(res);
-			return -1;
-	}
-
-	PQclear(res);
-
 	fflush(pset.queryFout);
 
 	/* Possible microtiming output */
 	if (pset.timing)
 		PrintTiming(elapsed_msec);
 
-	return 1;
+	return res;
 }
 
 
@@ -886,86 +838,35 @@ loop_exit:
 }
 
 
-/*
- * ProcessResult: utility function for use by SendQuery() only
- *
- * When our command string contained a COPY FROM STDIN or COPY TO STDOUT,
- * PQexec() has stopped at the PGresult associated with the first such
- * command.  In that event, we'll marshal data for the COPY and then cycle
- * through any subsequent PGresult objects.
- *
- * When the command string contained no such COPY command, this function
- * degenerates to an AcceptResult() call.
- *
- * Changes its argument to point to the last PGresult of the command string,
- * or NULL if that result was for a COPY TO STDOUT.  (Returning NULL prevents
- * the command status from being printed, which we want in that case so that
- * the status line doesn't get taken as part of the COPY data.)
- *
- * Returns true on complete success, false otherwise.  Possible failure modes
- * include purely client-side problems; check the transaction status for the
- * server-side opinion.
- */
-static bool
-ProcessResult(PGresult **results)
-{
-	bool		success = true;
-	bool		first_cycle = true;
-
-	for (;;)
-	{
-		ExecStatusType result_status;
-		bool		is_copy;
-		PGresult   *next_result;
-
-		if (!AcceptResult(*results))
-		{
-			/*
-			 * Failure at this point is always a server-side failure or a
-			 * failure to submit the command string.  Either way, we're
-			 * finished with this command string.
-			 */
-			success = false;
-			break;
-		}
-
-		result_status = PQresultStatus(*results);
-		switch (result_status)
-		{
-			case PGRES_EMPTY_QUERY:
-			case PGRES_COMMAND_OK:
-			case PGRES_TUPLES_OK:
-				is_copy = false;
-				break;
-
-			case PGRES_COPY_OUT:
-			case PGRES_COPY_IN:
-				is_copy = true;
-				break;
-
-			default:
-				/* AcceptResult() should have caught anything else. */
-				is_copy = false;
-				pg_log_error("unexpected PQresultStatus: %d", result_status);
-				break;
-		}
-
-		if (is_copy)
-		{
 /*
  * Marshal the COPY data.  Either subroutine will get the
  * connection out of its COPY state, then call PQresultStatus()
-			 * once and report any error.
+ * once and report any error. Return whether all was ok.
  *
  * For COPY OUT, direct the output to pset.copyStream if it's set,
  * otherwise to pset.gfname if it's set, otherwise to queryFout.
  * For COPY IN, use pset.copyStream as data source if it's set,
  * otherwise cur_cmd_source.
+ *
+ * Update result if further processing is necessary, or NULL otherwise.
+ * Return a result when queryFout can safely output a result status:
+ * on COPY IN, or on COPY OUT if written to something other than pset.queryFout.
+ * Returning NULL prevents the command status from being printed, which
+ * we want if the status line doesn't get taken as part of the COPY data.
  */
+static bool
+HandleCopyResult(PGresult **result)
+{
+	bool		success;
 	FILE	   *copystream;
 	PGresult   *copy_result;
+	ExecStatusType result_status = PQresultStatus(*result);
+
+	Assert(result_status == PGRES_COPY_OUT ||
+		   result_status == PGRES_COPY_IN);
 
 	SetCancelConn(pset.db);
+
 	if (result_status == PGRES_COPY_OUT)
 	{
 		bool		need_close = false;
@@ -998,7 +899,6 @@ ProcessResult(PGresult **results)
 		success = handleCopyOut(pset.db,
 								copystream,
 								&copy_result)
-					&& success
 			&& (copystream != NULL);
 
 		/*
@@ -1032,52 +932,21 @@ ProcessResult(PGresult **results)
 		copystream = pset.copyStream ? pset.copyStream : pset.cur_cmd_source;
 		success = handleCopyIn(pset.db,
 							   copystream,
-									   PQbinaryTuples(*results),
+							   PQbinaryTuples(*result),
-									   &copy_result) && success;
+							   &copy_result);
 	}
+
 	ResetCancelConn();
-
+	PQclear(*result);
-			/*
+	*result = copy_result;
-			 * Replace the PGRES_COPY_OUT/IN result with COPY command's exit
-			 * status, or with NULL if we want to suppress printing anything.
-			 */
-			PQclear(*results);
-			*results = copy_result;
-		}
-		else if (first_cycle)
-		{
-			/* fast path: no COPY commands; PQexec visited all results */
-			break;
-		}
-
-		/*
-		 * Check PQgetResult() again.  In the typical case of a single-command
-		 * string, it will return NULL.  Otherwise, we'll have other results
-		 * to process that may include other COPYs.  We keep the last result.
-		 */
-		next_result = PQgetResult(pset.db);
-		if (!next_result)
-			break;
-
-		PQclear(*results);
-		*results = next_result;
-		first_cycle = false;
-	}
-
-	SetResultVariables(*results, success);
-
-	/* may need this to recover from conn loss during COPY */
-	if (!first_cycle && !CheckConnection())
-		return false;
 
 	return success;
 }
 
-
 /*
  * PrintQueryStatus: report command status as required
  *
- * Note: Utility function for use by PrintQueryResults() only.
+ * Note: Utility function for use by HandleQueryResult() only.
  */
 static void
 PrintQueryStatus(PGresult *results)
@@ -1105,43 +974,50 @@ PrintQueryStatus(PGresult *results)
 
 
 /*
- * PrintQueryResults: print out (or store or execute) query results as required
+ * HandleQueryResult: print out, store or execute one query result
- *
+ * as required.
- * Note: Utility function for use by SendQuery() only.
  *
  * Returns true if the query executed successfully, false otherwise.
  */
 static bool
-PrintQueryResults(PGresult *results)
+HandleQueryResult(PGresult *result, bool last)
 {
 	bool		success;
 	const char *cmdstatus;
 
-	if (!results)
+	if (result == NULL)
 		return false;
 
-	switch (PQresultStatus(results))
+	switch (PQresultStatus(result))
 	{
 		case PGRES_TUPLES_OK:
 			/* store or execute or print the data ... */
-			if (pset.gset_prefix)
+			if (last && pset.gset_prefix)
-				success = StoreQueryTuple(results);
+				success = StoreQueryTuple(result);
-			else if (pset.gexec_flag)
+			else if (last && pset.gexec_flag)
-				success = ExecQueryTuples(results);
+				success = ExecQueryTuples(result);
-			else if (pset.crosstab_flag)
+			else if (last && pset.crosstab_flag)
-				success = PrintResultsInCrosstab(results);
+				success = PrintResultsInCrosstab(result);
+			else if (last || pset.show_all_results)
+				success = PrintQueryTuples(result);
 			else
-				success = PrintQueryTuples(results);
+				success = true;
+
 			/* if it's INSERT/UPDATE/DELETE RETURNING, also print status */
-			cmdstatus = PQcmdStatus(results);
+			if (last || pset.show_all_results)
+			{
+				cmdstatus = PQcmdStatus(result);
 				if (strncmp(cmdstatus, "INSERT", 6) == 0 ||
 					strncmp(cmdstatus, "UPDATE", 6) == 0 ||
 					strncmp(cmdstatus, "DELETE", 6) == 0)
-				PrintQueryStatus(results);
+					PrintQueryStatus(result);
+			}
+
 			break;
 
 		case PGRES_COMMAND_OK:
-			PrintQueryStatus(results);
+			if (last || pset.show_all_results)
+				PrintQueryStatus(result);
 			success = true;
 			break;
 
@@ -1151,7 +1027,7 @@ PrintQueryResults(PGresult *results)
 
 		case PGRES_COPY_OUT:
 		case PGRES_COPY_IN:
-			/* nothing to do here */
+			/* nothing to do here: already processed */
 			success = true;
 			break;
 
@@ -1164,7 +1040,7 @@ PrintQueryResults(PGresult *results)
 		default:
 			success = false;
 			pg_log_error("unexpected PQresultStatus: %d",
-						 PQresultStatus(results));
+						 PQresultStatus(result));
 			break;
 	}
 
@@ -1173,6 +1049,217 @@ PrintQueryResults(PGresult *results)
 	return success;
 }
 
+/*
+ * Data structure and functions to record notices while they are
+ * emitted, so that they can be shown later.
+ *
+ * We need to know which result is last, which requires to extract
+ * one result in advance, hence two buffers are needed.
+ */
+typedef struct {
+	bool			in_flip;
+	PQExpBufferData	flip;
+	PQExpBufferData	flop;
+} t_notice_messages;
+
+/*
+ * Store notices in appropriate buffer, for later display.
+ */
+static void
+AppendNoticeMessage(void *arg, const char *msg)
+{
+	t_notice_messages *notes = (t_notice_messages*) arg;
+	appendPQExpBufferStr(notes->in_flip ? &notes->flip : &notes->flop, msg);
+}
+
+/*
+ * Show notices stored in buffer, which is then reset.
+ */
+static void
+ShowNoticeMessage(t_notice_messages *notes)
+{
+	PQExpBufferData	*current = notes->in_flip ? &notes->flip : &notes->flop;
+	if (current->data != NULL && *current->data != '\0')
+		pg_log_info("%s", current->data);
+	resetPQExpBuffer(current);
+}
+
+/*
+ * SendQueryAndProcessResults: utility function for use by SendQuery()
+ * and PSQLexecWatch().
+ *
+ * Sends query and cycles through PGresult objects.
+ *
+ * When not under \watch and if our command string contained a COPY FROM STDIN
+ * or COPY TO STDOUT, the PGresult associated with these commands must be
+ * processed by providing an input or output stream.  In that event, we'll
+ * marshal data for the COPY.
+ *
+ * For other commands, the results are processed normally, depending on their
+ * status.
+ *
+ * Returns 1 on complete success, 0 on interrupt and -1 or errors.  Possible
+ * failure modes include purely client-side problems; check the transaction
+ * status for the server-side opinion.
+ *
+ * Note that on a combined query, failure does not mean that nothing was
+ * committed.
+ */
+static int
+SendQueryAndProcessResults(const char *query, double *pelapsed_msec, bool is_watch)
+{
+	bool				success;
+	instr_time			before;
+	PGresult		   *result;
+	t_notice_messages	notes;
+
+	if (pset.timing)
+		INSTR_TIME_SET_CURRENT(before);
+
+	success = PQsendQuery(pset.db, query);
+	ResetCancelConn();
+
+	if (!success)
+	{
+		const char *error = PQerrorMessage(pset.db);
+
+		if (strlen(error))
+			pg_log_info("%s", error);
+
+		CheckConnection();
+
+		return -1;
+	}
+
+	/*
+	 * If SIGINT is sent while the query is processing, the interrupt will be
+	 * consumed.  The user's intention, though, is to cancel the entire watch
+	 * process, so detect a sent cancellation request and exit in this case.
+	 */
+	if (is_watch && cancel_pressed)
+	{
+		ClearOrSaveAllResults();
+		return 0;
+	}
+
+	/* intercept notices */
+	notes.in_flip = true;
+	initPQExpBuffer(&notes.flip);
+	initPQExpBuffer(&notes.flop);
+	PQsetNoticeProcessor(pset.db, AppendNoticeMessage, &notes);
+
+	/* first result */
+	result = PQgetResult(pset.db);
+
+	while (result != NULL)
+	{
+		ExecStatusType result_status;
+		PGresult   *next_result;
+		bool		last;
+
+		if (!AcceptResult(result, false))
+		{
+			/*
+			 * Some error occured, either a server-side failure or
+			 * a failure to submit the command string.  Record that.
+			 */
+			const char *error = PQerrorMessage(pset.db);
+
+			ShowNoticeMessage(&notes);
+			if (strlen(error))
+				pg_log_info("%s", error);
+			CheckConnection();
+			if (!is_watch)
+				SetResultVariables(result, false);
+			ClearOrSaveResult(result);
+			success = false;
+
+			/* and switch to next result */
+			result = PQgetResult(pset.db);
+			continue;
+		}
+
+		/* must handle COPY before changing the current result */
+		result_status = PQresultStatus(result);
+		Assert(result_status != PGRES_COPY_BOTH);
+		if (result_status == PGRES_COPY_IN ||
+			result_status == PGRES_COPY_OUT)
+		{
+			ShowNoticeMessage(&notes);
+
+			if (is_watch)
+			{
+				ClearOrSaveAllResults();
+				pg_log_error("\\watch cannot be used with COPY");
+				return -1;
+			}
+
+			/* use normal notice processor during COPY */
+			PQsetNoticeProcessor(pset.db, NoticeProcessor, NULL);
+
+			success &= HandleCopyResult(&result);
+
+			PQsetNoticeProcessor(pset.db, AppendNoticeMessage, &notes);
+		}
+
+		/*
+		 * Check PQgetResult() again.  In the typical case of a single-command
+		 * string, it will return NULL.  Otherwise, we'll have other results
+		 * to process.
+		 */
+		notes.in_flip = !notes.in_flip;
+		next_result = PQgetResult(pset.db);
+		notes.in_flip = !notes.in_flip;
+		last = (next_result == NULL);
+
+		/*
+		 * Get timing measure before printing the last result.
+		 *
+		 * It will include the display of previous results, if any.
+		 * This cannot be helped because the server goes on processing
+		 * further queries anyway while the previous ones are being displayed.
+		 * The parallel execution of the client display hides the server time
+		 * when it is shorter.
+		 *
+		 * With combined queries, timing must be understood as an upper bound
+		 * of the time spent processing them.
+		 */
+		if (last && pset.timing)
+		{
+			instr_time	now;
+			INSTR_TIME_SET_CURRENT(now);
+			INSTR_TIME_SUBTRACT(now, before);
+			*pelapsed_msec = INSTR_TIME_GET_MILLISEC(now);
+		}
+
+		/* notices already shown above for copy */
+		ShowNoticeMessage(&notes);
+
+		/* this may or may not print something depending on settings */
+		if (result != NULL)
+			success &= HandleQueryResult(result, last);
+
+		/* set variables on last result if all went well */
+		if (!is_watch && last && success)
+			SetResultVariables(result, true);
+
+		ClearOrSaveResult(result);
+		notes.in_flip = !notes.in_flip;
+		result = next_result;
+	}
+
+	/* reset notice hook */
+	PQsetNoticeProcessor(pset.db, NoticeProcessor, NULL);
+	termPQExpBuffer(&notes.flip);
+	termPQExpBuffer(&notes.flop);
+
+	/* may need this to recover from conn loss during COPY */
+	if (!CheckConnection())
+		return -1;
+
+	return success ? 1 : -1;
+}
+
 
 /*
  * SendQuery: send the query string to the backend
@@ -1294,28 +1381,9 @@ SendQuery(const char *query)
 			 pset.crosstab_flag || !is_select_command(query))
 	{
 		/* Default fetch-it-all-and-print mode */
-		instr_time	before,
+		int res = SendQueryAndProcessResults(query, &elapsed_msec, false);
-					after;
+		OK = (res >= 0);
-
+		results = NULL;
-		if (pset.timing)
-			INSTR_TIME_SET_CURRENT(before);
-
-		results = PQexec(pset.db, query);
-
-		/* these operations are included in the timing result: */
-		ResetCancelConn();
-		OK = ProcessResult(&results);
-
-		if (pset.timing)
-		{
-			INSTR_TIME_SET_CURRENT(after);
-			INSTR_TIME_SUBTRACT(after, before);
-			elapsed_msec = INSTR_TIME_GET_MILLISEC(after);
-		}
-
-		/* but printing results isn't: */
-		if (OK && results)
-			OK = PrintQueryResults(results);
 	}
 	else
 	{
@@ -1497,7 +1565,7 @@ DescribeQuery(const char *query, double *elapsed_msec)
 	PQclear(results);
 
 	results = PQdescribePrepared(pset.db, "");
-	OK = AcceptResult(results) &&
+	OK = AcceptResult(results, true) &&
 		(PQresultStatus(results) == PGRES_COMMAND_OK);
 	if (OK && results)
 	{
@@ -1545,7 +1613,7 @@ DescribeQuery(const char *query, double *elapsed_msec)
 			PQclear(results);
 
 			results = PQexec(pset.db, buf.data);
-			OK = AcceptResult(results);
+			OK = AcceptResult(results, true);
 
 			if (pset.timing)
 			{
@@ -1555,7 +1623,7 @@ DescribeQuery(const char *query, double *elapsed_msec)
 			}
 
 			if (OK && results)
-				OK = PrintQueryResults(results);
+				OK = HandleQueryResult(results, true);
 
 			termPQExpBuffer(&buf);
 		}
@@ -1614,7 +1682,7 @@ ExecQueryUsingCursor(const char *query, double *elapsed_msec)
 	if (PQtransactionStatus(pset.db) == PQTRANS_IDLE)
 	{
 		results = PQexec(pset.db, "BEGIN");
-		OK = AcceptResult(results) &&
+		OK = AcceptResult(results, true) &&
 			(PQresultStatus(results) == PGRES_COMMAND_OK);
 		ClearOrSaveResult(results);
 		if (!OK)
@@ -1628,7 +1696,7 @@ ExecQueryUsingCursor(const char *query, double *elapsed_msec)
 					  query);
 
 	results = PQexec(pset.db, buf.data);
-	OK = AcceptResult(results) &&
+	OK = AcceptResult(results, true) &&
 		(PQresultStatus(results) == PGRES_COMMAND_OK);
 	if (!OK)
 		SetResultVariables(results, OK);
@@ -1701,7 +1769,7 @@ ExecQueryUsingCursor(const char *query, double *elapsed_msec)
 				is_pager = false;
 			}
 
-			OK = AcceptResult(results);
+			OK = AcceptResult(results, true);
 			Assert(!OK);
 			SetResultVariables(results, OK);
 			ClearOrSaveResult(results);
@@ -1810,7 +1878,7 @@ cleanup:
 	results = PQexec(pset.db, "CLOSE _psql_cursor");
 	if (OK)
 	{
-		OK = AcceptResult(results) &&
+		OK = AcceptResult(results, true) &&
 			(PQresultStatus(results) == PGRES_COMMAND_OK);
 		ClearOrSaveResult(results);
 	}
@@ -1820,7 +1888,7 @@ cleanup:
 	if (started_txn)
 	{
 		results = PQexec(pset.db, OK ? "COMMIT" : "ROLLBACK");
-		OK &= AcceptResult(results) &&
+		OK &= AcceptResult(results, true) &&
 			(PQresultStatus(results) == PGRES_COMMAND_OK);
 		ClearOrSaveResult(results);
 	}

src/bin/psql/help.c

@@ -410,6 +410,8 @@ helpVariables(unsigned short int pager)
 	fprintf(output, _("  SERVER_VERSION_NAME\n"
 					  "  SERVER_VERSION_NUM\n"
 					  "    server's version (in short string or numeric format)\n"));
+	fprintf(output, _("  SHOW_ALL_RESULTS\n"
+					  "    show all results of a combined query (\\;) instead of only the last\n"));
 	fprintf(output, _("  SHOW_CONTEXT\n"
 					  "    controls display of message context fields [never, errors, always]\n"));
 	fprintf(output, _("  SINGLELINE\n"

src/bin/psql/settings.h

@@ -148,6 +148,7 @@ typedef struct _psqlSettings
 	const char *prompt2;
 	const char *prompt3;
 	PGVerbosity verbosity;		/* current error verbosity level */
+	bool		show_all_results;
 	PGContextVisibility show_context;	/* current context display level */
 } PsqlSettings;
 

src/bin/psql/startup.c

@@ -196,6 +196,7 @@ main(int argc, char *argv[])
 	SetVariable(pset.vars, "PROMPT1", DEFAULT_PROMPT1);
 	SetVariable(pset.vars, "PROMPT2", DEFAULT_PROMPT2);
 	SetVariable(pset.vars, "PROMPT3", DEFAULT_PROMPT3);
+	SetVariableBool(pset.vars, "SHOW_ALL_RESULTS");
 
 	parse_psql_options(argc, argv, &options);
 
@@ -1130,6 +1131,12 @@ verbosity_hook(const char *newval)
 	return true;
 }
 
+static bool
+show_all_results_hook(const char *newval)
+{
+	return ParseVariableBool(newval, "SHOW_ALL_RESULTS", &pset.show_all_results);
+}
+
 static char *
 show_context_substitute_hook(char *newval)
 {
@@ -1231,6 +1238,9 @@ EstablishVariableSpace(void)
 	SetVariableHooks(pset.vars, "VERBOSITY",
 					 verbosity_substitute_hook,
 					 verbosity_hook);
+	SetVariableHooks(pset.vars, "SHOW_ALL_RESULTS",
+					 bool_substitute_hook,
+					 show_all_results_hook);
 	SetVariableHooks(pset.vars, "SHOW_CONTEXT",
 					 show_context_substitute_hook,
 					 show_context_hook);

src/bin/psql/tab-complete.c

@@ -4122,7 +4122,7 @@ psql_completion(const char *text, int start, int end)
 		matches = complete_from_variables(text, "", "", false);
 	else if (TailMatchesCS("\\set", MatchAny))
 	{
-		if (TailMatchesCS("AUTOCOMMIT|ON_ERROR_STOP|QUIET|"
+		if (TailMatchesCS("AUTOCOMMIT|ON_ERROR_STOP|QUIET|SHOW_ALL_RESULTS|"
 						  "SINGLELINE|SINGLESTEP"))
 			COMPLETE_WITH_CS("on", "off");
 		else if (TailMatchesCS("COMP_KEYWORD_CASE"))

src/test/regress/expected/copyselect.out

@@ -126,7 +126,7 @@ copy (select 1) to stdout\; select 1/0;	-- row, then error
 ERROR:  division by zero
 select 1/0\; copy (select 1) to stdout; -- error only
 ERROR:  division by zero
-copy (select 1) to stdout\; copy (select 2) to stdout\; select 0\; select 3; -- 1 2 3
+copy (select 1) to stdout\; copy (select 2) to stdout\; select 3\; select 4; -- 1 2 3 4
 1
 2
  ?column? 
@@ -134,8 +134,18 @@ copy (select 1) to stdout\; copy (select 2) to stdout\; select 0\; select 3; --
         3
 (1 row)
 
+ ?column? 
+----------
+        4
+(1 row)
+
 create table test3 (c int);
-select 0\; copy test3 from stdin\; copy test3 from stdin\; select 1; -- 1
+select 0\; copy test3 from stdin\; copy test3 from stdin\; select 1; -- 0 1
+ ?column? 
+----------
+        0
+(1 row)
+
  ?column? 
 ----------
         1

src/test/regress/expected/psql.out

@@ -5078,3 +5078,96 @@ List of access methods
  hash  | uuid_ops        | uuid                 | uuid                  |      2 | uuid_hash_extended
 (5 rows)
 
+--
+-- combined queries
+--
+CREATE FUNCTION warn(msg TEXT) RETURNS BOOLEAN LANGUAGE plpgsql
+AS $$
+  BEGIN RAISE NOTICE 'warn %', msg ; RETURN TRUE ; END
+$$;
+-- show both
+SELECT 1 AS one \; SELECT warn('1.5') \; SELECT 2 AS two ;
+ one 
+-----
+   1
+(1 row)
+
+NOTICE:  warn 1.5
+CONTEXT:  PL/pgSQL function warn(text) line 2 at RAISE
+ warn 
+------
+ t
+(1 row)
+
+ two 
+-----
+   2
+(1 row)
+
+-- \gset applies to last query only
+SELECT 3 AS three \; SELECT warn('3.5') \; SELECT 4 AS four \gset
+ three 
+-------
+     3
+(1 row)
+
+NOTICE:  warn 3.5
+CONTEXT:  PL/pgSQL function warn(text) line 2 at RAISE
+ warn 
+------
+ t
+(1 row)
+
+\echo :three :four
+:three 4
+-- syntax error stops all processing
+SELECT 5 \; SELECT 6 + \; SELECT warn('6.5') \; SELECT 7 ;
+ERROR:  syntax error at or near ";"
+LINE 1: SELECT 5 ; SELECT 6 + ; SELECT warn('6.5') ; SELECT 7 ;
+                              ^
+-- with aborted transaction, stop on first error
+BEGIN \; SELECT 8 AS eight \; SELECT 9/0 AS nine \; ROLLBACK \; SELECT 10 AS ten ;
+ eight 
+-------
+     8
+(1 row)
+
+ERROR:  division by zero
+-- close previously aborted transaction
+ROLLBACK;
+-- misc SQL commands
+-- (non SELECT output is sent to stderr, thus is not shown in expected results)
+SELECT 'ok' AS "begin" \;
+CREATE TABLE psql_comics(s TEXT) \;
+INSERT INTO psql_comics VALUES ('Calvin'), ('hobbes') \;
+COPY psql_comics FROM STDIN \;
+UPDATE psql_comics SET s = 'Hobbes' WHERE s = 'hobbes' \;
+DELETE FROM psql_comics WHERE s = 'Moe' \;
+COPY psql_comics TO STDOUT \;
+TRUNCATE psql_comics \;
+DROP TABLE psql_comics \;
+SELECT 'ok' AS "done" ;
+ begin 
+-------
+ ok
+(1 row)
+
+Calvin
+Susie
+Hobbes
+ done 
+------
+ ok
+(1 row)
+
+\set SHOW_ALL_RESULTS off
+SELECT 1 AS one \; SELECT warn('1.5') \; SELECT 2 AS two ;
+NOTICE:  warn 1.5
+CONTEXT:  PL/pgSQL function warn(text) line 2 at RAISE
+ two 
+-----
+   2
+(1 row)
+
+\set SHOW_ALL_RESULTS on
+DROP FUNCTION warn(TEXT);

src/test/regress/expected/transactions.out

@@ -900,8 +900,18 @@ DROP TABLE abc;
 -- tests rely on the fact that psql will not break SQL commands apart at a
 -- backslash-quoted semicolon, but will send them as one Query.
 create temp table i_table (f1 int);
--- psql will show only the last result in a multi-statement Query
+-- psql will show all results of a multi-statement Query
 SELECT 1\; SELECT 2\; SELECT 3;
+ ?column? 
+----------
+        1
+(1 row)
+
+ ?column? 
+----------
+        2
+(1 row)
+
  ?column? 
 ----------
         3
@@ -916,6 +926,12 @@ insert into i_table values(1)\; select * from i_table;
 
 -- 1/0 error will cause rolling back the whole implicit transaction
 insert into i_table values(2)\; select * from i_table\; select 1/0;
+ f1 
+----
+  1
+  2
+(2 rows)
+
 ERROR:  division by zero
 select * from i_table;
  f1 
@@ -935,8 +951,18 @@ WARNING:  there is no transaction in progress
 -- begin converts implicit transaction into a regular one that
 -- can extend past the end of the Query
 select 1\; begin\; insert into i_table values(5);
+ ?column? 
+----------
+        1
+(1 row)
+
 commit;
 select 1\; begin\; insert into i_table values(6);
+ ?column? 
+----------
+        1
+(1 row)
+
 rollback;
 -- commit in implicit-transaction state commits but issues a warning.
 insert into i_table values(7)\; commit\; insert into i_table values(8)\; select 1/0;
@@ -963,22 +989,52 @@ rollback;  -- we are not in a transaction at this point
 WARNING:  there is no transaction in progress
 -- implicit transaction block is still a transaction block, for e.g. VACUUM
 SELECT 1\; VACUUM;
+ ?column? 
+----------
+        1
+(1 row)
+
 ERROR:  VACUUM cannot run inside a transaction block
 SELECT 1\; COMMIT\; VACUUM;
 WARNING:  there is no transaction in progress
+ ?column? 
+----------
+        1
+(1 row)
+
 ERROR:  VACUUM cannot run inside a transaction block
 -- we disallow savepoint-related commands in implicit-transaction state
 SELECT 1\; SAVEPOINT sp;
+ ?column? 
+----------
+        1
+(1 row)
+
 ERROR:  SAVEPOINT can only be used in transaction blocks
 SELECT 1\; COMMIT\; SAVEPOINT sp;
 WARNING:  there is no transaction in progress
+ ?column? 
+----------
+        1
+(1 row)
+
 ERROR:  SAVEPOINT can only be used in transaction blocks
 ROLLBACK TO SAVEPOINT sp\; SELECT 2;
 ERROR:  ROLLBACK TO SAVEPOINT can only be used in transaction blocks
 SELECT 2\; RELEASE SAVEPOINT sp\; SELECT 3;
+ ?column? 
+----------
+        2
+(1 row)
+
 ERROR:  RELEASE SAVEPOINT can only be used in transaction blocks
 -- but this is OK, because the BEGIN converts it to a regular xact
 SELECT 1\; BEGIN\; SAVEPOINT sp\; ROLLBACK TO SAVEPOINT sp\; COMMIT;
+ ?column? 
+----------
+        1
+(1 row)
+
 -- Tests for AND CHAIN in implicit transaction blocks
 SET TRANSACTION READ ONLY\; COMMIT AND CHAIN;  -- error
 ERROR:  COMMIT AND CHAIN can only be used in transaction blocks

src/test/regress/sql/copyselect.sql

@@ -84,10 +84,10 @@ drop table test1;
 -- psql handling of COPY in multi-command strings
 copy (select 1) to stdout\; select 1/0;	-- row, then error
 select 1/0\; copy (select 1) to stdout; -- error only
-copy (select 1) to stdout\; copy (select 2) to stdout\; select 0\; select 3; -- 1 2 3
+copy (select 1) to stdout\; copy (select 2) to stdout\; select 3\; select 4; -- 1 2 3 4
 
 create table test3 (c int);
-select 0\; copy test3 from stdin\; copy test3 from stdin\; select 1; -- 1
+select 0\; copy test3 from stdin\; copy test3 from stdin\; select 1; -- 0 1
 1
 \.
 2

src/test/regress/sql/psql.sql

@@ -1228,3 +1228,41 @@ drop role regress_partitioning_role;
 \dAo * pg_catalog.jsonb_path_ops
 \dAp+ btree float_ops
 \dAp * pg_catalog.uuid_ops
+
+--
+-- combined queries
+--
+CREATE FUNCTION warn(msg TEXT) RETURNS BOOLEAN LANGUAGE plpgsql
+AS $$
+  BEGIN RAISE NOTICE 'warn %', msg ; RETURN TRUE ; END
+$$;
+-- show both
+SELECT 1 AS one \; SELECT warn('1.5') \; SELECT 2 AS two ;
+-- \gset applies to last query only
+SELECT 3 AS three \; SELECT warn('3.5') \; SELECT 4 AS four \gset
+\echo :three :four
+-- syntax error stops all processing
+SELECT 5 \; SELECT 6 + \; SELECT warn('6.5') \; SELECT 7 ;
+-- with aborted transaction, stop on first error
+BEGIN \; SELECT 8 AS eight \; SELECT 9/0 AS nine \; ROLLBACK \; SELECT 10 AS ten ;
+-- close previously aborted transaction
+ROLLBACK;
+-- misc SQL commands
+-- (non SELECT output is sent to stderr, thus is not shown in expected results)
+SELECT 'ok' AS "begin" \;
+CREATE TABLE psql_comics(s TEXT) \;
+INSERT INTO psql_comics VALUES ('Calvin'), ('hobbes') \;
+COPY psql_comics FROM STDIN \;
+UPDATE psql_comics SET s = 'Hobbes' WHERE s = 'hobbes' \;
+DELETE FROM psql_comics WHERE s = 'Moe' \;
+COPY psql_comics TO STDOUT \;
+TRUNCATE psql_comics \;
+DROP TABLE psql_comics \;
+SELECT 'ok' AS "done" ;
+Moe
+Susie
+\.
+\set SHOW_ALL_RESULTS off
+SELECT 1 AS one \; SELECT warn('1.5') \; SELECT 2 AS two ;
+\set SHOW_ALL_RESULTS on
+DROP FUNCTION warn(TEXT);

src/test/regress/sql/transactions.sql

@@ -504,7 +504,7 @@ DROP TABLE abc;
 
 create temp table i_table (f1 int);
 
--- psql will show only the last result in a multi-statement Query
+-- psql will show all results of a multi-statement Query
 SELECT 1\; SELECT 2\; SELECT 3;
 
 -- this implicitly commits: