Feat: Implement getting all Features from database

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/database/DatabaseHandler.java

@@ -20,7 +20,6 @@ import java.sql.ResultSet;
 import java.sql.SQLException;
 
 import java.util.ArrayList;
-import java.util.Collections;
 import java.util.List;
 
 public class DatabaseHandler {
@@ -98,7 +97,7 @@ public class DatabaseHandler {
 
     public static CityObject unmarshallCityObject(GmlId id) {
         try (Connection con = new ConnectionWrapper(H2GISDBFactory.openSpatialDataBase(DB_NAME))) {
-            try (PreparedStatement ps = con.prepareStatement("SELECT * FROM features WHERE gmlid = ?")) {
+            try (PreparedStatement ps = con.prepareStatement("SELECT gmlid, bbox, data, type FROM features WHERE gmlid = ?")) {
                 ps.setString(1, id.toString());
                 ResultSet rs = ps.executeQuery();
                 if (rs.next()) {
@@ -119,8 +118,20 @@ public class DatabaseHandler {
         return null;
     }
 
-    public static List<? extends CityObject> getBufferIntersectingObjects(CityObject co, Double buffersize) {
-        ResultSet rs = null;
+    public static List<CityObject> getAllCityObjects() {
+        List<CityObject> cos = new ArrayList<>();
+        try (Connection con = new ConnectionWrapper(H2GISDBFactory.openSpatialDataBase(DB_NAME))) {
+            try (PreparedStatement ps = con.prepareStatement("SELECT gmlid, bbox, data, type FROM features")) {
+                ResultSet rs = ps.executeQuery();
+                cos.addAll(retrieveCityObjects(rs));
+            }
+        } catch (SQLException e) {
+            logger.error("Connection to database failed while trying to get all CityObjects!");
+            logger.debug(e.getMessage());
+        }
+        return cos;
+    }
+
     public static List<CityObject> getBufferIntersectingObjects(CityObject co, Double buffersize) {
         List<CityObject> intersectingObjects = new ArrayList<>();
         try (Connection con = new ConnectionWrapper(H2GISDBFactory.openSpatialDataBase(DB_NAME))) {
@@ -143,7 +154,7 @@ public class DatabaseHandler {
         List<CityObject> intersectingObjects = new ArrayList<>();
 
         try (Connection con = new ConnectionWrapper(H2GISDBFactory.openSpatialDataBase(DB_NAME))) {
-            try (PreparedStatement ps = con.prepareStatement("SELECT * FROM features AS tab1" +
+            try (PreparedStatement ps = con.prepareStatement("SELECT gmlid, bbox, data, type FROM features AS tab1" +
                     " WHERE ST_INTERSECTS(tab1.geom, (SELECT GEOM FROM features WHERE gmlid = ?)) AND tab1.gmlid <> ?")) {
                 ps.setString(1, co.getGmlId().toString());
                 ps.setString(2, co.getGmlId().toString());