From 9555c96d6a29e8f293d7161b0aea2c60dd33d66f Mon Sep 17 00:00:00 2001
From: Jakub Vrana <jakub@vrana.cz>
Date: Sun, 13 Apr 2025 16:59:07 +0200
Subject: [PATCH] PostgreSQL: Link parent from inherited tables (bug #1031)

---
 adminer/drivers/pgsql.inc.php   | 10 ++++++++++
 adminer/include/adminer.inc.php |  4 ++--
 adminer/include/driver.inc.php  |  7 +++++++
 adminer/lang/cs.inc.php         |  1 +
 adminer/lang/xx.inc.php         |  1 +
 adminer/table.inc.php           | 20 ++++++++++++++------
 6 files changed, 35 insertions(+), 8 deletions(-)

diff --git a/adminer/drivers/pgsql.inc.php b/adminer/drivers/pgsql.inc.php
index 066278f2..21656465 100644
--- a/adminer/drivers/pgsql.inc.php
+++ b/adminer/drivers/pgsql.inc.php
@@ -324,6 +324,16 @@ if (isset($_GET["pgsql"])) {
 			}
 		}
 
+		function inheritsFrom(string $table): array {
+			return get_vals("SELECT p.relname
+FROM pg_class c
+JOIN pg_namespace n ON n.nspname = current_schema() AND n.oid = c.relnamespace
+JOIN pg_inherits ON inhrelid = c.oid
+JOIN pg_class p ON inhparent = p.oid
+WHERE c.relname = " . q($table) . " AND c.relkind = 'r'
+ORDER BY 1");
+		}
+
 		function inheritedTables(string $table): array {
 			return get_vals("SELECT c.relname
 FROM pg_class p
diff --git a/adminer/include/adminer.inc.php b/adminer/include/adminer.inc.php
index c58e6dbc..463c4ff8 100644
--- a/adminer/include/adminer.inc.php
+++ b/adminer/include/adminer.inc.php
@@ -184,6 +184,7 @@ class Adminer {
 	* @param ?string $set new item options, NULL for no new item
 	*/
 	function selectLinks(array $tableStatus, ?string $set = ""): void {
+		$name = $tableStatus["Name"];
 		echo '<p class="links">';
 		$links = array("select" => lang('Select data'));
 		if (support("table") || support("indexes")) {
@@ -194,14 +195,13 @@ class Adminer {
 			$is_view = is_view($tableStatus);
 			if ($is_view) {
 				$links["view"] = lang('Alter view');
-			} else {
+			} elseif (!driver()->inheritsFrom($name)) {
 				$links["create"] = lang('Alter table');
 			}
 		}
 		if ($set !== null) {
 			$links["edit"] = lang('New item');
 		}
-		$name = $tableStatus["Name"];
 		foreach ($links as $key => $val) {
 			echo " <a href='" . h(ME) . "$key=" . urlencode($name) . ($key == "edit" ? $set : "") . "'" . bold(isset($_GET[$key])) . ">$val</a>";
 		}
diff --git a/adminer/include/driver.inc.php b/adminer/include/driver.inc.php
index 0496ddbf..a7e05443 100644
--- a/adminer/include/driver.inc.php
+++ b/adminer/include/driver.inc.php
@@ -217,6 +217,13 @@ abstract class SqlDriver {
 	function tableHelp(string $name, bool $is_view = false) {
 	}
 
+	/** Get tables this table inherits from
+	* @return list<string>
+	*/
+	function inheritsFrom(string $table): array {
+		return array();
+	}
+
 	/** Get inherited tables
 	* @return list<string>
 	*/
diff --git a/adminer/lang/cs.inc.php b/adminer/lang/cs.inc.php
index fb26d01a..a950a36e 100644
--- a/adminer/lang/cs.inc.php
+++ b/adminer/lang/cs.inc.php
@@ -194,6 +194,7 @@ Lang::$translations = array(
 	'Partitions' => 'Oddíly',
 	'Partition name' => 'Název oddílu',
 	'Values' => 'Hodnoty',
+	'Inherits from' => 'Zděděná z',
 	'Inherited tables' => 'Zděděné tabulky',
 
 	'View' => 'Pohled',
diff --git a/adminer/lang/xx.inc.php b/adminer/lang/xx.inc.php
index 51a8ede6..34dfdbb7 100644
--- a/adminer/lang/xx.inc.php
+++ b/adminer/lang/xx.inc.php
@@ -196,6 +196,7 @@ Lang::$translations = array(
 	'Partitions' => 'Xx',
 	'Partition name' => 'Xx',
 	'Values' => 'Xx',
+	'Inherits from' => 'Xx',
 	'Inherited tables' => 'Xx',
 
 	'View' => 'Xx',
diff --git a/adminer/table.inc.php b/adminer/table.inc.php
index fc3a3b0e..85067d45 100644
--- a/adminer/table.inc.php
+++ b/adminer/table.inc.php
@@ -22,7 +22,19 @@ if ($comment != "") {
 	echo "<p class='nowrap'>" . lang('Comment') . ": " . h($comment) . "\n";
 }
 
-if ($fields) {
+function tables_links($tables) {
+	echo "<ul>\n";
+	foreach ($tables as $table) {
+		echo "<li><a href='" . h(ME . "table=" . urlencode($table)) . "'>" . h($table) . "</a>";
+	}
+	echo "</ul>\n";
+}
+
+$inherits = driver()->inheritsFrom($TABLE);
+if ($inherits) {
+	echo "<h3>" . lang('Inherits from') . "</h3>\n";
+	tables_links($inherits);
+} elseif ($fields) {
 	adminer()->tableStructurePrint($fields, $table_status);
 }
 
@@ -99,9 +111,5 @@ if (support(is_view($table_status) ? "view_trigger" : "trigger")) {
 $inherited = driver()->inheritedTables($TABLE);
 if ($inherited) {
 	echo "<h3 id='inherited'>" . lang('Inherited tables') . "</h3>\n";
-	echo "<ul>\n";
-	foreach ($inherited as $val) {
-		echo "<li><a href='" . h(ME . "table=" . urlencode($val)) . "'>" . h($val) . "</a>\n";
-	}
-	echo "</ul>\n";
+	tables_links($inherited);
 }