Index: bootstrap.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/bootstrap.inc,v
retrieving revision 1.41
diff -u -r1.41 bootstrap.inc
--- bootstrap.inc       19 Mar 2005 01:24:18 -0000      1.41
+++ bootstrap.inc       8 Apr 2005 13:06:16 -0000
@@ -167,8 +167,13 @@
 function variable_set($name, $value) {
   global $conf;
 
-  db_query("DELETE FROM {variable} WHERE name = '%s'", $name);
-  db_query("INSERT INTO {variable} (name, value) VALUES ('%s', '%s')", $name, serialize($value));
+  if (db_result(db_query("SELECT COUNT(*) FROM {variable} WHERE name = '%s'", $name))) {
+    db_query("UPDATE {variable} SET value = '%s' WHERE name = '%s'", serialize($value), $name);
+  }
+  else {
+    db_query("INSERT INTO {variable} (name, value) VALUES ('%s', '%s')", $name, serialize($value));
+  }
+
   cache_clear_all('variables');
 
   $conf[$name] = $value;