code: public synchronized boolean getBoolean(
              int parameterIndex) throws SQLException {
  
          Object o = getColumnInType(parameterIndex, Type.SQL_BOOLEAN);
  
          return o == null ? false
                           : ((Boolean) o).booleanValue();
      }
docs: <!-- start generic documentation -->
  
  (JDBC4 modified:)
  Retrieves the value of the designated JDBC <code>BIT</code>
  or <code>BOOLEAN</code> parameter as a
  <code>boolean</code> in the Java programming language.
  
  <!-- end generic documentation -->
  
  <!-- start release-specific documentation -->
  <div class="ReleaseSpecificDocumentation">
  <h3>HSQLDB-Specific Information:</h3> <p>
  
  HSQLDB supports this feature. <p>
  
  </div>
  <!-- end release-specific documentation -->
  
  @param parameterIndex the first parameter is 1, the second is 2,
  and so on
  @return the parameter value.  If the value is SQL <code>NULL</code>,
  the result is <code>false</code>.
  @exception SQLException if a database access error occurs or
  this method is called on a closed <code>CallableStatement</code>
  @see #setBoolean