68 lines
2.2 KiB
Java
68 lines
2.2 KiB
Java
import java.sql.Connection;
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import java.sql.DriverManager;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import java.util.ArrayList;
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public class Database {
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private Connection connection;
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public Database() {
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try {
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Class.forName("org.mariadb.jdbc.Driver");
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this.connection = DriverManager.getConnection(
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"jdbc:mariadb://dwarves.iut-fbleau.fr/baudrier",
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"baudrier",
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"baudrier"
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);
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} catch(ClassNotFoundException exception) {
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System.err.println("Class 'org.mariadb.jdbc.Driver' not found.");
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} catch(SQLException exception) {
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System.err.println("Error while trying to connect to the database");
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}
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}
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public Votes getVotesFromCompetitor(String country) {
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try {
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PreparedStatement query = this.connection.prepareStatement(
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"SELECT Voters.name, Votes.points " +
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"FROM Votes " +
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"JOIN Countries AS Competitors ON Votes.competitor_id = Competitors.id " +
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"JOIN Countries AS Voters ON Votes.voter_id = Voters.id " +
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"WHERE Competitors.name = ?;"
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);
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query.setString(1, country);
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ResultSet result = query.executeQuery();
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ArrayList<Vote> voteList = new ArrayList<>();
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while(result.next()) {
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voteList.add(new Vote(result.getString("name"), result.getInt("points")));
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}
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try {
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query.close();
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} catch(SQLException exception) {
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System.err.println("Error while trying to close the query.");
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}
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return new Votes(country, voteList);
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} catch(SQLException exception) {
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System.err.println("Error while trying to prepare or execute the query (" + exception.getMessage() + ").");
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}
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return null;
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}
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public void close() {
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try {
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this.connection.close();
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} catch(SQLException exception) {
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System.err.println("Error while trying to close the connection.");
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}
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}
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}
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