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Commit2be368a

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Display incoming as well as outgoing foreign-key constraints in psql's
\d output for a table.Kenneth D'Souza, some changes by myself.
1 parent2169e42 commit2be368a

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1 file changed

+53
-11
lines changed

1 file changed

+53
-11
lines changed

‎src/bin/psql/describe.c

Lines changed: 53 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -3,7 +3,7 @@
33
*
44
* Copyright (c) 2000-2008, PostgreSQL Global Development Group
55
*
6-
* $PostgreSQL: pgsql/src/bin/psql/describe.c,v 1.164 2008/01/01 19:45:56 momjian Exp $
6+
* $PostgreSQL: pgsql/src/bin/psql/describe.c,v 1.165 2008/03/30 17:50:11 tgl Exp $
77
*/
88
#include"postgres_fe.h"
99
#include"describe.h"
@@ -1106,12 +1106,14 @@ describeOneTableDetails(const char *schemaname,
11061106
*result3=NULL,
11071107
*result4=NULL,
11081108
*result5=NULL,
1109-
*result6=NULL;
1109+
*result6=NULL,
1110+
*result7=NULL;
11101111
intcheck_count=0,
11111112
index_count=0,
11121113
foreignkey_count=0,
11131114
rule_count=0,
11141115
trigger_count=0,
1116+
referencedby_count=0,
11151117
inherits_count=0;
11161118
intcount_footers=0;
11171119

@@ -1228,24 +1230,47 @@ describeOneTableDetails(const char *schemaname,
12281230
foreignkey_count=PQntuples(result5);
12291231
}
12301232

1233+
/* count incoming foreign-key references (none if no triggers) */
1234+
if (tableinfo.triggers)
1235+
{
1236+
printfPQExpBuffer(&buf,
1237+
"SELECT conname, conrelid::pg_catalog.regclass,\n"
1238+
" pg_catalog.pg_get_constraintdef(oid, true) as condef\n"
1239+
"FROM pg_catalog.pg_constraint c\n"
1240+
"WHERE c.confrelid = '%s' AND c.contype = 'f' ORDER BY 1",
1241+
oid);
1242+
result6=PSQLexec(buf.data, false);
1243+
if (!result6)
1244+
{
1245+
PQclear(result1);
1246+
PQclear(result2);
1247+
PQclear(result3);
1248+
PQclear(result4);
1249+
PQclear(result5);
1250+
gotoerror_return;
1251+
}
1252+
else
1253+
referencedby_count=PQntuples(result6);
1254+
}
1255+
12311256
/* count inherited tables */
1232-
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);
1257+
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);
12331258

1234-
result6=PSQLexec(buf.data, false);
1235-
if (!result6)
1236-
{
1259+
result7=PSQLexec(buf.data, false);
1260+
if (!result7)
1261+
{
12371262
PQclear(result1);
12381263
PQclear(result2);
12391264
PQclear(result3);
12401265
PQclear(result4);
12411266
PQclear(result5);
1267+
PQclear(result6);
12421268
gotoerror_return;
12431269
}
12441270
else
1245-
inherits_count=PQntuples(result6);
1271+
inherits_count=PQntuples(result7);
12461272

1247-
footers=pg_malloc_zero((index_count+check_count+rule_count+trigger_count+foreignkey_count+inherits_count+7+1)
1248-
*sizeof(*footers));
1273+
footers=pg_malloc_zero((index_count+check_count+rule_count+trigger_count+foreignkey_count+referencedby_count+inherits_count+8+1)*sizeof(*footers));
12491274

12501275
/* print indexes */
12511276
if (index_count>0)
@@ -1333,6 +1358,22 @@ describeOneTableDetails(const char *schemaname,
13331358
}
13341359
}
13351360

1361+
/* print incoming foreign-key constraints */
1362+
if (referencedby_count>0)
1363+
{
1364+
printfPQExpBuffer(&buf,_("Referenced by:"));
1365+
footers[count_footers++]=pg_strdup(buf.data);
1366+
for (i=0;i<referencedby_count;i++)
1367+
{
1368+
printfPQExpBuffer(&buf,_(" \"%s\" IN %s %s"),
1369+
PQgetvalue(result6,i,0),
1370+
PQgetvalue(result6,i,1),
1371+
PQgetvalue(result6,i,2));
1372+
1373+
footers[count_footers++]=pg_strdup(buf.data);
1374+
}
1375+
}
1376+
13361377
/* print rules */
13371378
if (rule_count>0)
13381379
{
@@ -1487,9 +1528,9 @@ describeOneTableDetails(const char *schemaname,
14871528
constchar*s=_("Inherits");
14881529

14891530
if (i==0)
1490-
printfPQExpBuffer(&buf,"%s: %s",s,PQgetvalue(result6,i,0));
1531+
printfPQExpBuffer(&buf,"%s: %s",s,PQgetvalue(result7,i,0));
14911532
else
1492-
printfPQExpBuffer(&buf,"%*s %s", (int)strlen(s),"",PQgetvalue(result6,i,0));
1533+
printfPQExpBuffer(&buf,"%*s %s", (int)strlen(s),"",PQgetvalue(result7,i,0));
14931534
if (i<inherits_count-1)
14941535
appendPQExpBuffer(&buf,",");
14951536

@@ -1516,6 +1557,7 @@ describeOneTableDetails(const char *schemaname,
15161557
PQclear(result4);
15171558
PQclear(result5);
15181559
PQclear(result6);
1560+
PQclear(result7);
15191561
}
15201562

15211563
printTable(title.data,headers,

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