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Old 04-30-2005, 08:41 AM   #1
gertcuppens
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Join Date: Feb 2005
Location: ANtwerp - Belgium
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How to connect to MySQL (3)

So, for each DAO or Data Access Object you need, you will let this class inherit from the GeneralDao I described earlier.

Here's an example of a DAO :

Code:
package org.gertcuppens.cluifDao; /*import java.sql */ import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Blob; import java.util.ArrayList; // import java.util.Collection; /* import org.gertcuppens.* */ import org.gertcuppens.cluif.Film; import org.gertcuppens.cluif.FilmMedewerker; import org.gertcuppens.algemeen.Melding; /** * @author GC1494 * * De GeneralDao definieert éénmaal de getConnection() methode om connectie met de databank te leggen. * Alle DAO's erven van deze GeneralDao. */ public class FilmDao extends GeneralDao { public ArrayList zoekFilmOpLetter(String _letter) throws Melding { ArrayList filmLijst = new ArrayList(); Connection con = null; PreparedStatement ps = null; ResultSet rs = null; try { StringBuffer zoekString = new StringBuffer(); zoekString.append("select * from film "); zoekString.append("where titel like '" + _letter + "%'"); System.out.println("zoekstring heeft de waarde " + zoekString); con = getDatabaseConnection(); ps = con.prepareStatement(zoekString.toString()); rs = ps.executeQuery(); if (rs == null) { ps.close(); con.close(); System.out.println("geen film gevonden"); } else { while (rs.next() ) { Film film = new Film (rs, "lijst"); System.out.println("gevonden film is " + film.getTitel()); filmLijst.add(film); } /* while rs.next() */ rs.close(); ps.close(); con.close(); } /* else : rs != null */ } catch (SQLException sqlEx) { Melding melding = new Melding(sqlEx); throw melding; } catch (Melding melding) { throw melding; } return filmLijst; }
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