From 2be368a5af44b1a1c509d16256036acc9ba6d78b Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Sun, 30 Mar 2008 17:50:11 +0000
Subject: [PATCH] Display incoming as well as outgoing foreign-key constraints
in psql's \d output for a table.
Kenneth D'Souza, some changes by myself.
---
src/bin/psql/describe.c | 64 ++++++++++++++++++++++++++++++++++-------
1 file changed, 53 insertions(+), 11 deletions(-)
diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index 86b24b45494..96c578aa70e 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -3,7 +3,7 @@
*
* Copyright (c) 2000-2008, PostgreSQL Global Development Group
*
- * $PostgreSQL: pgsql/src/bin/psql/describe.c,v 1.164 2008/01/01 19:45:56 momjian Exp $
+ * $PostgreSQL: pgsql/src/bin/psql/describe.c,v 1.165 2008/03/30 17:50:11 tgl Exp $
*/
#include "postgres_fe.h"
#include "describe.h"
@@ -1106,12 +1106,14 @@ describeOneTableDetails(const char *schemaname,
*result3 = NULL,
*result4 = NULL,
*result5 = NULL,
- *result6 = NULL;
+ *result6 = NULL,
+ *result7 = NULL;
int check_count = 0,
index_count = 0,
foreignkey_count = 0,
rule_count = 0,
trigger_count = 0,
+ referencedby_count = 0,
inherits_count = 0;
int count_footers = 0;
@@ -1228,24 +1230,47 @@ describeOneTableDetails(const char *schemaname,
foreignkey_count = PQntuples(result5);
}
+ /* count incoming foreign-key references (none if no triggers) */
+ if (tableinfo.triggers)
+ {
+ printfPQExpBuffer(&buf,
+ "SELECT conname, conrelid::pg_catalog.regclass,\n"
+ " pg_catalog.pg_get_constraintdef(oid, true) as condef\n"
+ "FROM pg_catalog.pg_constraint c\n"
+ "WHERE c.confrelid = '%s' AND c.contype = 'f' ORDER BY 1",
+ oid);
+ result6 = PSQLexec(buf.data, false);
+ if (!result6)
+ {
+ PQclear(result1);
+ PQclear(result2);
+ PQclear(result3);
+ PQclear(result4);
+ PQclear(result5);
+ goto error_return;
+ }
+ else
+ referencedby_count = PQntuples(result6);
+ }
+
/* count inherited tables */
- printfPQExpBuffer(&buf, "SELECT c.oid::regclass FROM pg_catalog.pg_class c, pg_catalog.pg_inherits i WHERE c.oid=i.inhparent AND i.inhrelid = '%s' ORDER BY inhseqno ASC", oid);
+ printfPQExpBuffer(&buf, "SELECT c.oid::pg_catalog.regclass FROM pg_catalog.pg_class c, pg_catalog.pg_inherits i WHERE c.oid=i.inhparent AND i.inhrelid = '%s' ORDER BY inhseqno", oid);
- result6 = PSQLexec(buf.data, false);
- if (!result6)
- {
+ result7 = PSQLexec(buf.data, false);
+ if (!result7)
+ {
PQclear(result1);
PQclear(result2);
PQclear(result3);
PQclear(result4);
PQclear(result5);
+ PQclear(result6);
goto error_return;
}
else
- inherits_count = PQntuples(result6);
+ inherits_count = PQntuples(result7);
- footers = pg_malloc_zero((index_count + check_count + rule_count + trigger_count + foreignkey_count + inherits_count + 7 + 1)
- * sizeof(*footers));
+ footers = pg_malloc_zero((index_count + check_count + rule_count + trigger_count + foreignkey_count + referencedby_count + inherits_count + 8 + 1) * sizeof(*footers));
/* print indexes */
if (index_count > 0)
@@ -1333,6 +1358,22 @@ describeOneTableDetails(const char *schemaname,
}
}
+ /* print incoming foreign-key constraints */
+ if (referencedby_count > 0)
+ {
+ printfPQExpBuffer(&buf, _("Referenced by:"));
+ footers[count_footers++] = pg_strdup(buf.data);
+ for (i = 0; i < referencedby_count; i++)
+ {
+ printfPQExpBuffer(&buf, _(" \"%s\" IN %s %s"),
+ PQgetvalue(result6, i, 0),
+ PQgetvalue(result6, i, 1),
+ PQgetvalue(result6, i, 2));
+
+ footers[count_footers++] = pg_strdup(buf.data);
+ }
+ }
+
/* print rules */
if (rule_count > 0)
{
@@ -1487,9 +1528,9 @@ describeOneTableDetails(const char *schemaname,
const char *s = _("Inherits");
if (i == 0)
- printfPQExpBuffer(&buf, "%s: %s", s, PQgetvalue(result6, i, 0));
+ printfPQExpBuffer(&buf, "%s: %s", s, PQgetvalue(result7, i, 0));
else
- printfPQExpBuffer(&buf, "%*s %s", (int) strlen(s), "", PQgetvalue(result6, i, 0));
+ printfPQExpBuffer(&buf, "%*s %s", (int) strlen(s), "", PQgetvalue(result7, i, 0));
if (i < inherits_count - 1)
appendPQExpBuffer(&buf, ",");
@@ -1516,6 +1557,7 @@ describeOneTableDetails(const char *schemaname,
PQclear(result4);
PQclear(result5);
PQclear(result6);
+ PQclear(result7);
}
printTable(title.data, headers,
--
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