From c6fc6b63e88ba0592c0cc4bbf0542469544224d1 Mon Sep 17 00:00:00 2001
From: Jakub Vrana <jakub@vrana.cz>
Date: Wed, 21 Aug 2019 15:00:11 +0200
Subject: [PATCH] Allow editing foreign keys pointing to tables in other
 database/schema (bug #694)

---
 adminer/foreign.inc.php         | 31 +++++++++++++++++++++++--------
 adminer/include/editing.inc.php |  9 +++++++--
 changes.txt                     |  1 +
 3 files changed, 31 insertions(+), 10 deletions(-)

diff --git a/adminer/foreign.inc.php b/adminer/foreign.inc.php
index 811eb64b..4484175b 100644
--- a/adminer/foreign.inc.php
+++ b/adminer/foreign.inc.php
@@ -53,13 +53,29 @@ if ($_POST) {
 <form action="" method="post">
 <p>
 <?php
-if ($row["db"] == "" && $row["ns"] == "") {
-	$source = array_keys(fields($TABLE)); //! no text and blob
-	$target = ($TABLE === $row["table"] ? $source : array_keys(fields($row["table"])));
-	$referencable = array_keys(array_filter(table_status('', true), 'fk_support'));
-	echo lang('Target table') . ": ";
-	echo html_select("table", $referencable, $row["table"], "this.form['change-js'].value = '1'; this.form.submit();");
-	?>
+$source = array_keys(fields($TABLE)); //! no text and blob
+if ($row["db"] != "") {
+	$connection->select_db($row["db"]);
+}
+if ($row["ns"] != "") {
+	set_schema($row["ns"]);
+}
+$target = ($TABLE === $row["table"] ? $source : array_keys(fields($row["table"])));
+$referencable = array_keys(array_filter(table_status('', true), 'fk_support'));
+$onchange = "this.form['change-js'].value = '1'; this.form.submit();";
+echo lang('Target table') . ": " . html_select("table", $referencable, $row["table"], $onchange) . "\n";
+if ($jush == "pgsql") {
+	echo lang('Schema') . ": " . html_select("ns", $adminer->schemas(), $row["ns"] ? $row["ns"] : $_GET["ns"], $onchange);
+} elseif ($jush != "sqlite") {
+	$dbs = array();
+	foreach ($adminer->databases() as $db) {
+		if (!information_schema($db)) {
+			$dbs[] = $db;
+		}
+	}
+	echo lang('DB') . ": " . html_select("db", $dbs, $row["db"] ? $row["db"] : $_GET["db"], $onchange);
+}
+?>
 <input type="hidden" name="change-js" value="">
 <noscript><p><input type="submit" name="change" value="<?php echo lang('Change'); ?>"></noscript>
 <table cellspacing="0">
@@ -87,7 +103,6 @@ foreach ($row["source"] as $key => $val) {
 <p>
 <input type="submit" value="<?php echo lang('Save'); ?>">
 <noscript><p><input type="submit" name="add" value="<?php echo lang('Add column'); ?>"></noscript>
-<?php } ?>
 <?php if ($name != "") { ?><input type="submit" name="drop" value="<?php echo lang('Drop'); ?>"><?php echo confirm(lang('Drop %s?', $name)); ?><?php } ?>
 <input type="hidden" name="token" value="<?php echo $token; ?>">
 </form>
diff --git a/adminer/include/editing.inc.php b/adminer/include/editing.inc.php
index 59af7386..eb44fc8d 100644
--- a/adminer/include/editing.inc.php
+++ b/adminer/include/editing.inc.php
@@ -470,12 +470,17 @@ function remove_definer($query) {
 }
 
 /** Format foreign key to use in SQL query
-* @param array ("table" => string, "source" => array, "target" => array, "on_delete" => one of $on_actions, "on_update" => one of $on_actions)
+* @param array ("db" => string, "ns" => string, "table" => string, "source" => array, "target" => array, "on_delete" => one of $on_actions, "on_update" => one of $on_actions)
 * @return string
 */
 function format_foreign_key($foreign_key) {
 	global $on_actions;
-	return " FOREIGN KEY (" . implode(", ", array_map('idf_escape', $foreign_key["source"])) . ") REFERENCES " . table($foreign_key["table"])
+	$db = $foreign_key["db"];
+	$ns = $foreign_key["ns"];
+	return " FOREIGN KEY (" . implode(", ", array_map('idf_escape', $foreign_key["source"])) . ") REFERENCES "
+		. ($db != "" && $db != $_GET["db"] ? idf_escape($db) . "." : "")
+		. ($ns != "" && $ns != $_GET["ns"] ? idf_escape($ns) . "." : "")
+		. table($foreign_key["table"])
 		. " (" . implode(", ", array_map('idf_escape', $foreign_key["target"])) . ")" //! reuse $name - check in older MySQL versions
 		. (preg_match("~^($on_actions)\$~", $foreign_key["on_delete"]) ? " ON DELETE $foreign_key[on_delete]" : "")
 		. (preg_match("~^($on_actions)\$~", $foreign_key["on_update"]) ? " ON UPDATE $foreign_key[on_update]" : "")
diff --git a/changes.txt b/changes.txt
index 73d4ca26..08f369b1 100644
--- a/changes.txt
+++ b/changes.txt
@@ -1,4 +1,5 @@
 Adminer 4.7.3-dev:
+Allow editing foreign keys pointing to tables in other database/schema (bug #694)
 MySQL: Speed up displaying tables in large databases (bug #700, regression from 4.7.2)
 MySQL: Allow editing rows identified by negative floats (bug #695)
 MySQL: Skip editing generated columns