diff -r 4f912cd42876 -r 86b5d8a1662f src/main/kotlin/de/uapcore/lightpit/dao/postgres/PGUserDao.kt
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/kotlin/de/uapcore/lightpit/dao/postgres/PGUserDao.kt	Thu Nov 19 13:58:54 2020 +0100
@@ -0,0 +1,95 @@
+/*
+ * Copyright 2020 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.AbstractUserDao
+import de.uapcore.lightpit.dao.Functions
+import de.uapcore.lightpit.entities.User
+import java.sql.Connection
+import java.sql.ResultSet
+
+class PGUserDao(connection: Connection) : AbstractUserDao() {
+
+    companion object {
+        fun mapResult(rs: ResultSet): User {
+            val id = rs.getInt("userid")
+            return if (rs.wasNull()) {
+                User(-1)
+            } else {
+                val user = User(id)
+                user.username = rs.getString("username")
+                user.givenname = Functions.getSafeString(rs, "givenname")
+                user.lastname = Functions.getSafeString(rs, "lastname")
+                user.mail = Functions.getSafeString(rs, "mail")
+                user
+            }
+        }
+    }
+
+    private val listStmt = connection.prepareStatement(
+            "select userid, username, lastname, givenname, mail " +
+                    "from lpit_user where userid >= 0 " +
+                    "order by username")
+    private val findStmt = connection.prepareStatement(
+            "select userid, username, lastname, givenname, mail " +
+                    "from lpit_user where userid = ? ")
+    private val findByUsernameStmt = connection.prepareStatement(
+            "select userid, username, lastname, givenname, mail " +
+                    "from lpit_user where lower(username) = lower(?) ")
+    private val insertStmt = connection.prepareStatement("insert into lpit_user (username, lastname, givenname, mail) values (?, ?, ?, ?)")
+    private val updateStmt = connection.prepareStatement("update lpit_user set lastname = ?, givenname = ?, mail = ? where userid = ?")
+
+    override fun mapResult(rs: ResultSet): User = Companion.mapResult(rs)
+
+    override fun save(instance: User) {
+        insertStmt.setString(1, instance.username)
+        Functions.setStringOrNull(insertStmt, 2, instance.lastname)
+        Functions.setStringOrNull(insertStmt, 3, instance.givenname)
+        Functions.setStringOrNull(insertStmt, 4, instance.mail)
+        insertStmt.executeUpdate()
+    }
+
+    override fun update(instance: User): Boolean {
+        Functions.setStringOrNull(updateStmt, 1, instance.lastname)
+        Functions.setStringOrNull(updateStmt, 2, instance.givenname)
+        Functions.setStringOrNull(updateStmt, 3, instance.mail)
+        updateStmt.setInt(4, instance.id)
+        return updateStmt.executeUpdate() > 0
+    }
+
+    override fun list(): List<User> = super.list(listStmt)
+
+    override fun find(id: Int): User? {
+        findStmt.setInt(1, id)
+        return super.find(findStmt)
+    }
+
+    override fun findByUsername(username: String): User? {
+        findByUsernameStmt.setString(1, username)
+        return super.find(findByUsernameStmt)
+    }
+}
\ No newline at end of file