code: protected static void addDatabaseSpecificStatement(String databaseType, String activitiStatement, String ibatisStatement) {
      Map<String, String> specificStatements = databaseSpecificStatements.get(databaseType);
      if (specificStatements == null) {
        specificStatements = new HashMap<String, String>();
        databaseSpecificStatements.put(databaseType, specificStatements);
      }
      specificStatements.put(activitiStatement, ibatisStatement);
    }
docs: /////////////////////////////////////////////////////