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1 | /* |
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2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
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3 | * |
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4 | * Copyright 2018 Mike Becker. All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions are met: |
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8 | * |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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26 | * POSSIBILITY OF SUCH DAMAGE. |
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27 | * |
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28 | */ |
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29 | package de.uapcore.lightpit.dao; |
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30 | |
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31 | import java.sql.*; |
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32 | import java.util.ArrayList; |
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33 | import java.util.List; |
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34 | import java.util.Optional; |
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35 | import java.util.function.Function; |
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36 | |
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37 | /** |
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38 | * Some DAO utilities. |
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39 | */ |
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40 | public final class Functions { |
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41 | |
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42 | public static void setStringOrNull(PreparedStatement stmt, int index, String str) throws SQLException { |
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43 | if (str == null || str.isBlank()) { |
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44 | stmt.setNull(index, Types.VARCHAR); |
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45 | } else { |
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46 | stmt.setString(index, str); |
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47 | } |
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48 | } |
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49 | |
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50 | public static void setDateOrNull(PreparedStatement stmt, int index, Date date) throws SQLException { |
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51 | if (date == null) { |
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52 | stmt.setNull(index, Types.DATE); |
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53 | } else { |
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54 | stmt.setDate(index, date); |
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55 | } |
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56 | } |
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57 | |
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58 | public static <T> void setForeignKeyOrNull(PreparedStatement stmt, int index, T instance, Function<? super T, Integer> keyGetter) throws SQLException { |
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59 | Integer key = Optional.ofNullable(instance).map(keyGetter).orElse(null); |
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60 | if (key == null) { |
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61 | stmt.setNull(index, Types.INTEGER); |
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62 | } else { |
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63 | stmt.setInt(index, key); |
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64 | } |
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65 | } |
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66 | |
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67 | @FunctionalInterface |
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68 | public interface ResultSetMapper<T> { |
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69 | T apply(ResultSet rs) throws SQLException; |
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70 | } |
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71 | |
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72 | public static <T> List<T> list(PreparedStatement stmt, ResultSetMapper<T> mapper) throws SQLException { |
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73 | List<T> results = new ArrayList<>(); |
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74 | try (var result = stmt.executeQuery()) { |
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75 | while (result.next()) { |
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76 | final var project = mapper.apply(result); |
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77 | results.add(project); |
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78 | } |
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79 | } |
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80 | return results; |
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81 | } |
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82 | |
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83 | public static <T> T find(PreparedStatement stmt, ResultSetMapper<T> mapper) throws SQLException { |
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84 | try (var result = stmt.executeQuery()) { |
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85 | if (result.next()) { |
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86 | final var ent = mapper.apply(result); |
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87 | return ent; |
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88 | } else { |
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89 | return null; |
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90 | } |
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91 | } |
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92 | } |
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93 | |
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94 | private Functions() { |
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95 | |
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96 | } |
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97 | } |