code: public String getDatabase() {
  
          if (m_databaseKey == null) {
              m_databaseKey = getExtProperty("db.name");
          }
          if (CmsStringUtil.isEmpty(m_databaseKey)) {
              m_databaseKey = getSortedDatabases().get(0);
          }
          return m_databaseKey;
      }
docs: Returns the key of the selected database server (e.g. "mysql", "generic" or "oracle").<p>
  
  @return the key of the selected database server (e.g. "mysql", "generic" or "oracle")