Examples with JaqyFilterResultSet com.teradata.jaqy.connection.JaqyFilterResultSet used on opensource projects

Example 1 with JaqyFilterResultSet

use of com.teradata.jaqy.connection.JaqyFilterResultSet in project jaqy by Teradata.

the class JaqyInterpreter method print.

/**
 * Print the ResultSet.
 * <p>
 * It should be noted that this function does not close the ResultSet.
 * This behavior is to allow saved ResultSet to be re-used.
 * <p>
 * Depending on the client filtering, projection and sorting, either a
 * copy or another JaqyResult could be created to deal with these.
 *
 * @param	rs
 * 			ResultSet to be printed.
 * @return	the ResultSet passed in, or a copy of the ResultSet after
 * 			filtering, projection and sorting.
 */
public JaqyResultSet print(JaqyResultSet rs) {
    Display display = m_display;
    try {
        m_globals.log(Level.INFO, "ResultSet Type: " + ResultSetUtils.getResultSetType(rs.getType()));
        // before printing, we clear the current activity count in case we
        // had an error.
        m_activityCount = -1;
        boolean rsCanProject = false;
        // First, filter the ResultSet
        if (m_predicate != null) {
            @SuppressWarnings("resource") JaqyFilterResultSet newRS = new JaqyFilterResultSet(rs, rs.getHelper(), this);
            newRS.setStatement(rs.getStatement());
            newRS.setPredicate(m_predicate);
            rs = newRS;
            m_predicate = null;
            rsCanProject = true;
        }
        // Second, sort the ResultSet
        if (m_sortInfos != null) {
            if (!rs.isSortable()) {
                JaqyResultSet newRS = ResultSetUtils.copyResultSet(rs, m_limit, this);
                rs.close();
                rs = newRS;
            }
            rs.sort(m_sortInfos);
            m_sortInfos = null;
            rsCanProject = false;
        }
        // Lastly, do projection
        if (m_projectList != null) {
            if (rsCanProject) {
                // Re-use the current JaqyFilterResultSet if possible.
                ((JaqyFilterResultSet) rs).setProjection(m_projectList);
            } else {
                @SuppressWarnings("resource") JaqyFilterResultSet newRS = new JaqyFilterResultSet(rs, rs.getHelper(), this);
                newRS.setStatement(rs.getStatement());
                newRS.setPredicate(m_predicate);
                newRS.setProjection(m_projectList);
                rs = newRS;
            }
            m_projectList = null;
        }
        // Now check if we need to save the ResultSet.  If so, we need
        // to make this ResultSet in-memory and without filtering and
        // projections.
        boolean rewind = false;
        if (m_saveResultSet) {
            // check if we can avoid the copy the ResultSet
            if (!(rs instanceof JaqyDefaultResultSet) || !(rs.getResultSet() instanceof InMemoryResultSet)) {
                JaqyResultSet newRS = ResultSetUtils.copyResultSet(rs, 0, this);
                rs.close();
                rs = newRS;
            }
            getVariableManager().put("save", rs);
            rewind = true;
            m_saveResultSet = false;
        }
        JaqyExporter exporter = getExporter();
        if (exporter != null) {
            setExporter(null);
            m_activityCount = exporter.export(rs, this);
            return rs;
        }
        if (m_quiet) {
            m_activityCount = QuietPrinter.getInstance().print(rs, display.getPrintWriter(), m_limit, this);
        } else {
            m_activityCount = m_printer.print(rs, display.getPrintWriter(), m_limit, this);
        }
        if (rewind) {
            rs.beforeFirst();
            // prevent the ResultSet from closed.
            rs = null;
        }
        return rs;
    } catch (Exception ex) {
        display.error(this, ex);
        return null;
    }
}