Fri, 22 May 2020 16:21:59 +0200
some reformatting
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;
31 import java.sql.Date;
32 import java.sql.PreparedStatement;
33 import java.sql.SQLException;
34 import java.sql.Types;
35 import java.util.Optional;
36 import java.util.function.Function;
38 /**
39 * Some DAO utilities.
40 */
41 public final class Functions {
43 public static void setStringOrNull(PreparedStatement stmt, int index, String str) throws SQLException {
44 if (str == null || str.isBlank()) {
45 stmt.setNull(index, Types.VARCHAR);
46 } else {
47 stmt.setString(index, str);
48 }
49 }
51 public static void setDateOrNull(PreparedStatement stmt, int index, Date date) throws SQLException {
52 if (date == null) {
53 stmt.setNull(index, Types.DATE);
54 } else {
55 stmt.setDate(index, date);
56 }
57 }
59 public static <T> void setForeignKeyOrNull(PreparedStatement stmt, int index, T instance, Function<? super T, Integer> keyGetter) throws SQLException {
60 Integer key = Optional.ofNullable(instance).map(keyGetter).orElse(null);
61 if (key == null) {
62 stmt.setNull(index, Types.INTEGER);
63 } else {
64 stmt.setInt(index, key);
65 }
66 }
68 private Functions() {
70 }
71 }