- Added "query log" functionality to Drupal.  Inspired by weitzman's
  code/patch.

includes/common.inc

@@ -422,7 +422,14 @@ function timer_print() {
   global $timer;
   $stop = explode(" ", microtime());
   $diff = $stop[0] - $timer[0];
-  print "<PRE>execution time: $diff ms</PRE>";
+  print "<pre>execution time: $diff ms</pre>";
+}
+
+function query_print() {
+  global $queries;
+  print "<pre>";
+  print_r($queries);
+  print "</pre>";
 }
 
 function page_header() {
@@ -443,6 +450,10 @@ function page_footer() {
     timer_print();
   }
 
+  if (variable_get("dev_query", 0)) {
+    query_print();
+  }
+
   if (variable_get("cache", 0)) {
     cache_set();
   }

includes/database.mysql.inc

@@ -10,6 +10,11 @@ function db_connect($url) {
 }
 
 function db_query($query, $debug = 0) {
+  global $queries;
+
+  if (variable_get("dev_query", 0)) {
+    $queries[] = $query;
+  }
 
   $result = mysql_query($query);
 

includes/database.pear.inc

@@ -16,7 +16,11 @@ function db_connect($url) {
 }
 
 function db_query($query, $debug = 0) {
-  global $db_handle;
+  global $db_handle, $queries;
+
+  if (variable_get("dev_query", 0)) {
+    $queries[] = $query;
+  }
 
   $result = $db_handle->query($query);
 

modules/system.module

@@ -72,6 +72,8 @@ function system_view_options() {
   // development settings:
   $output .= "<h3>Development settings</h3>\n";
   $output .= form_select("Display timer information", "dev_timer", variable_get("dev_timer", 0), array("Disabled", "Enabled"), "Display the time it took to generate a page.  For Drupal development only.");
+  $output .= form_select("Display query log", "dev_query", variable_get("dev_query", 0), array("Disabled", "Enabled"), "Display a log of the database queries needed to generate the current page.");
+
   $output .= "<hr />\n";
 
   foreach (module_list() as $name) {

modules/system/system.module

@@ -72,6 +72,8 @@ function system_view_options() {
   // development settings:
   $output .= "<h3>Development settings</h3>\n";
   $output .= form_select("Display timer information", "dev_timer", variable_get("dev_timer", 0), array("Disabled", "Enabled"), "Display the time it took to generate a page.  For Drupal development only.");
+  $output .= form_select("Display query log", "dev_query", variable_get("dev_query", 0), array("Disabled", "Enabled"), "Display a log of the database queries needed to generate the current page.");
+
   $output .= "<hr />\n";
 
   foreach (module_list() as $name) {

modules/user.module

@@ -65,7 +65,7 @@ function user_load($array = array()) {
       $query .= "u.$key = '". addslashes($value) ."' AND ";
     }
   }
-  $result = db_query("SELECT u.*, r.perm FROM users u LEFT JOIN role r ON u.role = r.name WHERE $query u.status < 3");
+  $result = db_query("SELECT u.*, r.perm FROM users u LEFT JOIN role r ON u.role = r.name WHERE $query u.status < 3 LIMIT 1");
 
   $user = db_fetch_object($result);
 

modules/user/user.module

@@ -65,7 +65,7 @@ function user_load($array = array()) {
       $query .= "u.$key = '". addslashes($value) ."' AND ";
     }
   }
-  $result = db_query("SELECT u.*, r.perm FROM users u LEFT JOIN role r ON u.role = r.name WHERE $query u.status < 3");
+  $result = db_query("SELECT u.*, r.perm FROM users u LEFT JOIN role r ON u.role = r.name WHERE $query u.status < 3 LIMIT 1");
 
   $user = db_fetch_object($result);