Implemented a route to get a single Puzzle (through the PuzzleElement class) and added the DatabaseQueries class (containing all the different SQL queries used).

src/be/jeffcheasey88/peeratcode/repository/DatabaseQueries.java

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+package be.jeffcheasey88.peeratcode.repository;
+
+public class DatabaseQueries {
+	public static final String SPECIFIC_PUZZLE_QUERY = "SELECT * FROM puzzle WHERE id_puzzle = ?";
+}

src/be/jeffcheasey88/peeratcode/routes/PuzzleElement.java

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+package be.jeffcheasey88.peeratcode.routes;
+
+import be.jeffcheasey88.peeratcode.webserver.HttpReader;
+import be.jeffcheasey88.peeratcode.webserver.HttpUtil;
+import be.jeffcheasey88.peeratcode.webserver.HttpWriter;
+import be.jeffcheasey88.peeratcode.webserver.Response;
+import org.json.simple.JSONObject;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import static be.jeffcheasey88.peeratcode.repository.DatabaseQueries.SPECIFIC_PUZZLE_QUERY;
+
+public class PuzzleElement implements Response {
+	private final Connection con;
+
+	public PuzzleElement(Connection con) {
+		this.con = con;
+	}
+
+	@Override
+	public void exec(Matcher matcher, HttpReader reader, HttpWriter writer) throws Exception {
+		HttpUtil.responseHeaders(writer, 200, "Access-Control-Allow-Origin: *");
+
+		JSONObject puzzle = new JSONObject();
+
+		PreparedStatement puzzleStmt = con.prepareStatement(SPECIFIC_PUZZLE_QUERY);
+		puzzleStmt.setInt(1, extractId(matcher));
+
+		ResultSet puzzleResult = puzzleStmt.executeQuery();
+		if (puzzleResult.next()) {
+			puzzle.put("id", puzzleResult.getString("id_puzzle"));
+			puzzle.put("name", puzzleResult.getString("name"));
+			puzzle.put("content", puzzleResult.getString("content"));
+			puzzle.put("chapter", puzzleResult.getString("fk_chapter"));
+
+			writer.write(puzzle.toJSONString());
+		}
+		writer.flush();
+		writer.close();
+	}
+
+	@Override
+	public Pattern getPattern() {
+		return Pattern.compile("^\\/puzzle\\/([0-9]+)$");
+	}
+
+	private int extractId(Matcher matcher) {
+		return Integer.parseInt(matcher.group(1));
+	}
+}