code: @Override
  	public int deleteAllAlerts() throws DatabaseException {
      	SqlPreparedStatementWrapper psDeleteAllAlerts = null;
          try {
          	psDeleteAllAlerts = DbSQL.getSingleton().getPreparedStatement("alert.ps.deleteall");
  			return psDeleteAllAlerts.getPs().executeUpdate();
  		} catch (SQLException e) {
  			throw new DatabaseException(e);
  		} finally {
  			DbSQL.getSingleton().releasePreparedStatement(psDeleteAllAlerts);
  		}
      }
docs: /* (non-Javadoc)
  @see org.parosproxy.paros.db.paros.TableAlert#deleteAllAlerts()