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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.
This commit is contained in:
Tom Lane 2008-03-30 17:50:11 +00:00
parent 2169e42bef
commit 2be368a5af
1 changed files with 54 additions and 12 deletions
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66
src/bin/psql/describe.c
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@ -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 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);
result6 = PSQLexec(buf.data, false);
if (!result6)
/* 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::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);
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,