Sat, 29 Aug 2020 11:49:53 +0200
minor visual improvements
1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
3 *
4 * Copyright 2018 Mike Becker. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 *
28 */
29 package de.uapcore.lightpit.dao.postgres;
31 import de.uapcore.lightpit.dao.UserDao;
32 import de.uapcore.lightpit.entities.User;
34 import java.sql.Connection;
35 import java.sql.PreparedStatement;
36 import java.sql.ResultSet;
37 import java.sql.SQLException;
38 import java.util.ArrayList;
39 import java.util.List;
40 import java.util.Objects;
42 import static de.uapcore.lightpit.dao.Functions.setStringOrNull;
44 public final class PGUserDao implements UserDao {
46 private final PreparedStatement insert, update, list, find;
48 public PGUserDao(Connection connection) throws SQLException {
49 list = connection.prepareStatement(
50 "select userid, username, lastname, givenname, mail " +
51 "from lpit_user where userid >= 0 " +
52 "order by username");
53 find = connection.prepareStatement(
54 "select userid, username, lastname, givenname, mail " +
55 "from lpit_user where userid = ? ");
57 insert = connection.prepareStatement("insert into lpit_user (username, lastname, givenname, mail) values (?, ?, ?, ?)");
58 update = connection.prepareStatement("update lpit_user set lastname = ?, givenname = ?, mail = ? where userid = ?");
59 }
61 private User mapColumns(ResultSet result) throws SQLException {
62 final int id = result.getInt("userid");
63 if (id == 0) return null;
64 final var user = new User(id);
65 user.setUsername(result.getString("username"));
66 user.setGivenname(result.getString("givenname"));
67 user.setLastname(result.getString("lastname"));
68 user.setMail(result.getString("mail"));
69 return user;
70 }
72 @Override
73 public void save(User instance) throws SQLException {
74 Objects.requireNonNull(instance.getUsername());
75 insert.setString(1, instance.getUsername());
76 setStringOrNull(insert, 2, instance.getLastname());
77 setStringOrNull(insert, 3, instance.getGivenname());
78 setStringOrNull(insert, 4, instance.getMail());
79 insert.executeUpdate();
80 }
82 @Override
83 public boolean update(User instance) throws SQLException {
84 if (instance.getId() < 0) return false;
85 setStringOrNull(update, 1, instance.getLastname());
86 setStringOrNull(update, 2, instance.getGivenname());
87 setStringOrNull(update, 3, instance.getMail());
88 update.setInt(4, instance.getId());
89 return update.executeUpdate() > 0;
90 }
92 @Override
93 public List<User> list() throws SQLException {
94 List<User> users = new ArrayList<>();
95 try (var result = list.executeQuery()) {
96 while (result.next()) {
97 users.add(mapColumns(result));
98 }
99 }
100 return users;
101 }
103 @Override
104 public User find(int id) throws SQLException {
105 find.setInt(1, id);
106 try (var result = find.executeQuery()) {
107 if (result.next()) {
108 return mapColumns(result);
109 } else {
110 return null;
111 }
112 }
113 }
114 }