#279851 by catch, et al: Replace LOWER() with db_select() and LIKE() where possible.

modules/comment/comment.module

@@ -1990,7 +1990,7 @@ function comment_form_validate($form, &$form_state) {
         $query = db_select('users', 'u');
         $query->addField('u', 'uid', 'uid');
         $taken = $query
-          ->where('LOWER(name) = :name', array(':name' => $form_state['values']['name']))
+          ->condition('name', db_like($form_state['values']['name']), 'LIKE')
           ->countQuery()
           ->execute()
           ->fetchField();

modules/profile/profile.admin.inc

@@ -421,7 +421,12 @@ function profile_field_delete_submit($form, &$form_state) {
  */
 function profile_admin_settings_autocomplete($string) {
   $matches = array();
-  $result = db_query_range("SELECT category FROM {profile_field} WHERE LOWER(category) LIKE LOWER(:category)", 0, 10, array(':category' => $string . '%'));
+  $result = db_select('profile_field')
+    ->fields('profile_field', array('category'))
+    ->condition('category', db_like($string) . '%', 'LIKE')
+    ->range(0, 10)
+    ->execute();
+
   foreach ($result as $data) {
     $matches[$data->category] = check_plain($data->category);
   }

modules/profile/profile.module

@@ -610,8 +610,7 @@ function _profile_get_fields($category, $register = FALSE) {
     $query->condition('register', 1);
   }
   else {
-    // Use LOWER(:category) instead of PHP's strtolower() to avoid UTF-8 conversion issues.
-    $query->where('LOWER(category) = LOWER(:category)', array(':category' => $category));
+    $query->condition('category', db_like($category), 'LIKE');
   }
   if (!user_access('administer users')) {
     $query->condition('visibility', PROFILE_HIDDEN, '<>');

modules/profile/profile.pages.inc

@@ -125,10 +125,14 @@ function profile_autocomplete($field, $string) {
   $matches = array();
   $autocomplete_field = (bool) db_query_range("SELECT 1 FROM {profile_field} WHERE fid = :fid AND autocomplete = 1", 0, 1, array(':fid' => $field))->fetchField();
   if ($autocomplete_field) {
-    $values = db_query_range("SELECT value FROM {profile_value} WHERE fid = :fid AND LOWER(value) LIKE LOWER(:value) GROUP BY value ORDER BY value ASC", 0, 10, array(
-      ':fid' => $field,
-      ':value' => $string . '%',
-    ))->fetchCol();
+    $values = db_select('profile_value')
+      ->fields('profile_value', array('value'))
+      ->condition('fid', $field)
+      ->condition('value', db_like($string) . '%', 'LIKE')
+      ->groupBy('value')
+      ->orderBy('value')
+      ->range(0, 10)
+      ->execute()->fetchCol();
     foreach ($values as $value) {
       $matches[$value] = check_plain($value);
     }

modules/user/user.module

@@ -750,9 +750,11 @@ function user_access($string, $account = NULL) {
  * @return boolean TRUE for blocked users, FALSE for active.
  */
 function user_is_blocked($name) {
-  $deny = db_query("SELECT name FROM {users} WHERE status = 0 AND name = LOWER(:name)", array(':name' => $name))->fetchObject();
-
-  return $deny;
+  return db_select('users')
+    ->fields('users', array('name'))
+    ->condition('name', db_like($name), 'LIKE')
+    ->condition('status', 0)
+    ->execute()->fetchObject();
 }
 
 /**
@@ -1054,7 +1056,7 @@ function user_account_form_validate($form, &$form_state) {
       if ($error = user_validate_name($form_state['values']['name'])) {
         form_set_error('name', $error);
       }
-      elseif ((bool) db_query_range("SELECT 1 FROM {users} WHERE uid <> :uid AND LOWER(name) = LOWER(:name)", 0, 1, array(':uid' => $account->uid, ':name' => $form_state['values']['name']))->fetchField()) {
+      elseif ((bool) db_select('users')->fields('users', array('uid'))->condition('uid', $account->uid, '<>')->condition('name', db_like($form_state['values']['name']), 'LIKE')->range(0, 1)->execute()->fetchField()) {
         form_set_error('name', t('The name %name is already taken.', array('%name' => $form_state['values']['name'])));
       }
     }