Versio 1, ensimmäinen committi!

src/main/java/fi/lpam/dataluokat/Tietokanta.java

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+package fi.lpam.dataluokat;
+
+import fi.lpam.gui.virheDialogit.SiirtoVirhe;
+import fi.lpam.gui.virheDialogit.YhteysVirhe;
+
+import fi.lpam.Main;
+import javafx.scene.control.Alert;
+import org.apache.commons.lang3.SystemUtils;
+
+import java.io.*;
+import java.sql.*;
+import java.util.Objects;
+
+public class Tietokanta {
+    private static String osoite;
+    private static String dbPath = SystemUtils.getUserHome().getAbsolutePath() + "\\OneDrive\\Kuljetusruokasovellus\\tietokanta.db";
+
+    public Tietokanta(boolean dev) throws IOException {
+        if (dev) dbPath = "tietokanta.db";
+        File file = new File(dbPath);
+        try {
+            //noinspection ResultOfMethodCallIgnored
+            file.getParentFile().mkdirs();
+        }
+        catch (Exception _) {}
+        //noinspection ResultOfMethodCallIgnored
+        file.createNewFile();
+
+        osoite = "jdbc:sqlite:" + file.getAbsolutePath();
+
+
+        try (Connection conn = haeYhteys()) {
+            InputStream is = Objects.requireNonNull(Main.class.getResourceAsStream("tietokanta.sql"));
+            BufferedReader br = new BufferedReader(new InputStreamReader(is));
+            String sql = br.readAllAsString();
+
+            for (String query : sql.split(";")) {
+                conn.createStatement().execute(query);
+            }
+
+        }
+        catch (Exception e) {
+            SiirtoVirhe virhe = new SiirtoVirhe(e);
+            virhe.showAndWait();
+        }
+
+    }
+
+    public static Connection haeYhteys() {
+
+        Connection connection = null;
+        try {
+            connection = DriverManager.getConnection(osoite);
+        } catch (Exception e) {
+            Alert virhe = new YhteysVirhe(e);
+            virhe.showAndWait();
+        }
+        return connection;
+    }
+}