src/main/java/de/uapcore/lightpit/dao/Functions.java@57cfb94ab99f (annotated)
src/main/java/de/uapcore/lightpit/dao/Functions.java
Thu, 14 May 2020 22:48:01 +0200
- author
- Mike Becker <universe@uap-core.de>
- date
- Thu, 14 May 2020 22:48:01 +0200
- changeset 47
- 57cfb94ab99f
- child 62
- 833e0385572a
- permissions
- -rw-r--r--
projects can now be added and updated
| universe@47 | 1 | /* |
| universe@47 | 2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
| universe@47 | 3 | * |
| universe@47 | 4 | * Copyright 2018 Mike Becker. All rights reserved. |
| universe@47 | 5 | * |
| universe@47 | 6 | * Redistribution and use in source and binary forms, with or without |
| universe@47 | 7 | * modification, are permitted provided that the following conditions are met: |
| universe@47 | 8 | * |
| universe@47 | 9 | * 1. Redistributions of source code must retain the above copyright |
| universe@47 | 10 | * notice, this list of conditions and the following disclaimer. |
| universe@47 | 11 | * |
| universe@47 | 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| universe@47 | 13 | * notice, this list of conditions and the following disclaimer in the |
| universe@47 | 14 | * documentation and/or other materials provided with the distribution. |
| universe@47 | 15 | * |
| universe@47 | 16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| universe@47 | 17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| universe@47 | 18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| universe@47 | 19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| universe@47 | 20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| universe@47 | 21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| universe@47 | 22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| universe@47 | 23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| universe@47 | 24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| universe@47 | 25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| universe@47 | 26 | * POSSIBILITY OF SUCH DAMAGE. |
| universe@47 | 27 | * |
| universe@47 | 28 | */ |
| universe@47 | 29 | package de.uapcore.lightpit.dao; |
| universe@47 | 30 | |
| universe@47 | 31 | import java.sql.PreparedStatement; |
| universe@47 | 32 | import java.sql.SQLException; |
| universe@47 | 33 | import java.sql.Types; |
| universe@47 | 34 | import java.util.Optional; |
| universe@47 | 35 | import java.util.function.Function; |
| universe@47 | 36 | |
| universe@47 | 37 | /** |
| universe@47 | 38 | * Some DAO utilities. |
| universe@47 | 39 | */ |
| universe@47 | 40 | public final class Functions { |
| universe@47 | 41 | |
| universe@47 | 42 | public static void setStringOrNull(PreparedStatement stmt, int index, String str) throws SQLException { |
| universe@47 | 43 | if (str == null || str.isBlank()) { |
| universe@47 | 44 | stmt.setNull(index, Types.VARCHAR); |
| universe@47 | 45 | } else { |
| universe@47 | 46 | stmt.setString(index, str); |
| universe@47 | 47 | } |
| universe@47 | 48 | } |
| universe@47 | 49 | |
| universe@47 | 50 | public static <T> void setForeignKeyOrNull(PreparedStatement stmt, int index, T instance, Function<? super T, Integer> keyGetter) throws SQLException { |
| universe@47 | 51 | Integer key = Optional.ofNullable(instance).map(keyGetter).orElse(null); |
| universe@47 | 52 | if (key == null) { |
| universe@47 | 53 | stmt.setNull(index, Types.INTEGER); |
| universe@47 | 54 | } else { |
| universe@47 | 55 | stmt.setInt(index, key); |
| universe@47 | 56 | } |
| universe@47 | 57 | } |
| universe@47 | 58 | |
| universe@47 | 59 | private Functions() { |
| universe@47 | 60 | |
| universe@47 | 61 | } |
| universe@47 | 62 | } |
