Issue #6450: DatabaseSchema_mysql::fieldExists() does not escape the …

…column name and should be removed together DatabaseSchema_mysql::tableExists()

core/includes/database/mysql/schema.inc

@@ -502,23 +502,6 @@ class DatabaseSchema_mysql extends DatabaseSchema {
     return preg_replace('/; InnoDB free:.*$/', '', $comment);
   }
 
-  public function tableExists($table) {
-    // The information_schema table is very slow to query under MySQL 5.0.
-    // Instead, we try to select from the table in question.  If it fails,
-    // the most likely reason is that it does not exist. That is dramatically
-    // faster than using information_schema.
-    // @link http://bugs.mysql.com/bug.php?id=19588
-    // @todo: This override should be removed once we require a version of MySQL
-    // that has that bug fixed.
-    try {
-      $this->connection->queryRange("SELECT 1 FROM {" . $table . "}", 0, 1);
-      return TRUE;
-    }
-    catch (Exception $e) {
-      return FALSE;
-    }
-  }
-
   public function findTables($table_expression) {
     // Back-ticks need to be removed when selecting from the information_schema
     // table. These may be added if using DatabaseConnection::prefixTables() on
@@ -527,23 +510,6 @@ class DatabaseSchema_mysql extends DatabaseSchema {
     return parent::findTables($table_expression);
   }
 
-  public function fieldExists($table, $column) {
-    // The information_schema table is very slow to query under MySQL 5.0.
-    // Instead, we try to select from the table and field in question. If it
-    // fails, the most likely reason is that it does not exist. That is
-    // dramatically faster than using information_schema.
-    // @link http://bugs.mysql.com/bug.php?id=19588
-    // @todo: This override should be removed once we require a version of MySQL
-    // that has that bug fixed.
-    try {
-      $this->connection->queryRange("SELECT $column FROM {" . $table . "}", 0, 1);
-      return TRUE;
-    }
-    catch (Exception $e) {
-      return FALSE;
-    }
-  }
-
 }
 
 /**