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package cz.frantovo.sql.vyuka.dao;
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import cz.frantovo.sql.vyuka.dto.Pruvodce;
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import java.sql.Connection;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import java.util.logging.Level;
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/**
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* Načítá průvodce (nápovědu) z databáze.
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* @author fiki
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*/
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public class PruvodceDAO extends VyukaSuperDAO {
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private enum SQL {
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PODLE_KODU,
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PODLE_ID,
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PODLE_ID_PREDCHOZI,
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PODLE_ID_NASLEDUJICI
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}
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public Pruvodce getPruvodce(long id) {
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return getPruvodce(getSQL(SQL.PODLE_ID), id);
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}
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public Pruvodce getPruvodce(String kod) {
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return getPruvodce(getSQL(SQL.PODLE_KODU), kod);
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}
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public Pruvodce getPruvodcePredchozi(long id) {
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return getPruvodce(getSQL(SQL.PODLE_ID_PREDCHOZI), id);
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}
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public Pruvodce getPruvodceNasledujici(long id) {
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return getPruvodce(getSQL(SQL.PODLE_ID_NASLEDUJICI), id);
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}
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private Pruvodce getPruvodce(String selekt, Object... parametry) {
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Connection db = getSpojeni(DATABAZE.APLIKACE);
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if (db == null) {
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log.log(Level.SEVERE, "Databáze je null.");
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return null;
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} else {
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PreparedStatement ps = null;
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ResultSet rs = null;
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try {
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ps = db.prepareStatement(selekt);
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for (int i = 0; i < parametry.length; i++) {
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ps.setObject(i + 1, parametry[i]);
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}
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rs = ps.executeQuery();
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if (rs.next()) {
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Pruvodce p = new Pruvodce();
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p.setId(rs.getLong("id"));
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p.setKod(rs.getString("kod"));
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p.setNadpis(rs.getString("nadpis"));
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p.setObsah(rs.getString("obsah"));
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return p;
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} else {
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return null;
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}
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} catch (Exception e) {
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log.log(Level.SEVERE, "Chyba při hledání průvodce.", e);
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return null;
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} finally {
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zavri(db, ps, rs);
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}
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}
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}
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}
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