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.PreparedStatement; |
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32 import java.sql.ResultSet; |
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33 import java.sql.SQLException; |
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34 import java.sql.Types; |
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35 import java.util.ArrayList; |
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36 import java.util.List; |
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37 import java.util.Optional; |
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38 import java.util.function.Function; |
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39 |
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40 public abstract class AbstractDao<T> implements GenericDao<T> { |
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41 |
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42 private final PreparedStatement listQuery; |
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43 |
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44 protected AbstractDao(PreparedStatement listQuery) { |
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45 this.listQuery = listQuery; |
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46 } |
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47 |
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48 public final T mapColumns(ResultSet result) throws SQLException { |
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49 return mapColumns(result, ""); |
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50 } |
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51 |
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52 public abstract T mapColumns(ResultSet result, String qualifier) throws SQLException; |
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53 |
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54 /** |
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55 * Qualifies a column label if an qualifier is specified. |
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56 * |
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57 * @param qualifier an optional qualifier |
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58 * @param label the column label |
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59 * @return the label, qualified if necessary |
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60 */ |
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61 protected final String qual(String qualifier, String label) { |
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62 if (qualifier == null || qualifier.isBlank()) { |
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63 return label; |
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64 } else { |
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65 return qualifier + "." + label; |
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66 } |
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67 } |
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68 |
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69 protected final void setStringOrNull(PreparedStatement stmt, int index, String str) throws SQLException { |
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70 if (str == null || str.isBlank()) { |
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71 stmt.setNull(index, Types.VARCHAR); |
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72 } else { |
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73 stmt.setString(index, str); |
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74 } |
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75 } |
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76 |
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77 protected final <T> void setForeignKeyOrNull(PreparedStatement stmt, int index, T instance, Function<? super T, Integer> keyGetter) throws SQLException { |
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78 Integer key = Optional.ofNullable(instance).map(keyGetter).orElse(null); |
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79 if (key == null) { |
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80 stmt.setNull(index, Types.INTEGER); |
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81 } else { |
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82 stmt.setInt(index, key); |
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83 } |
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84 } |
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85 |
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86 @Override |
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87 public List<T> list() throws SQLException { |
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88 List<T> list = new ArrayList<>(); |
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89 try (ResultSet result = listQuery.executeQuery()) { |
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90 while (result.next()) { |
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91 list.add(mapColumns(result)); |
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92 } |
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93 } |
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94 return list; |
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95 } |
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96 } |
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