diff -r fecda0f466e6 -r cf85ef18f231 src/main/java/de/uapcore/lightpit/dao/postgres/PGProjectDao.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/java/de/uapcore/lightpit/dao/postgres/PGProjectDao.java	Mon May 11 19:09:06 2020 +0200
@@ -0,0 +1,92 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2018 Mike Becker. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+package de.uapcore.lightpit.dao.postgres;
+
+import de.uapcore.lightpit.dao.AbstractDao;
+import de.uapcore.lightpit.dao.ProjectDao;
+import de.uapcore.lightpit.entities.Project;
+import de.uapcore.lightpit.entities.User;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.Objects;
+
+public final class PGProjectDao extends AbstractDao<Project> implements ProjectDao {
+
+    private final PGUserDao userDao;
+
+    private final PreparedStatement insert;
+    private final PreparedStatement update;
+
+    public PGProjectDao(Connection connection, PGUserDao userDao) throws SQLException {
+        super(connection.prepareStatement(
+                "select * from lpit_project join lpit_user owner on lpit_project.owner = owner.userid"));
+
+        insert = connection.prepareStatement(
+                "insert into lpit_project (name, description, repourl, owner) values (?, ?, ?, ?)"
+        );
+        update = connection.prepareStatement(
+                "update lpit_project set name = ?, description = ?, repourl = ?, owner = ? where id = ?"
+        );
+
+        this.userDao = userDao;
+    }
+
+    @Override
+    public Project mapColumns(ResultSet result, String q) throws SQLException {
+        final var proj = new Project(result.getInt(qual(q, "id")));
+        proj.setName(result.getString(qual(q, "name")));
+        proj.setDescription(result.getString(qual(q, "description")));
+        proj.setRepoUrl(result.getString(qual(q, "repourl")));
+        proj.setOwner(userDao.mapColumns(result, "owner"));
+        return proj;
+    }
+
+    @Override
+    public void save(Project instance) throws SQLException {
+        Objects.requireNonNull(instance.getName());
+        insert.setString(1, instance.getName());
+        setStringOrNull(insert, 2, instance.getDescription());
+        setStringOrNull(insert, 3, instance.getRepoUrl());
+        setForeignKeyOrNull(insert, 4, instance.getOwner(), User::getUserID);
+        insert.executeUpdate();
+    }
+
+    @Override
+    public boolean update(Project instance) throws SQLException {
+        Objects.requireNonNull(instance.getName());
+        update.setString(1, instance.getName());
+        setStringOrNull(update, 2, instance.getDescription());
+        setStringOrNull(update, 3, instance.getRepoUrl());
+        setForeignKeyOrNull(update, 4, instance.getOwner(), User::getUserID);
+        return update.executeUpdate() > 0;
+    }
+}