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.SQLException; |
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32 import java.util.List; |
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33 |
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34 public interface RootEntityDao<T> { |
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35 |
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36 /** |
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37 * Lists all entities. |
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38 * @return a list of all entities |
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39 * @throws SQLException on any kind of SQL errors |
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40 */ |
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41 List<T> list() throws SQLException; |
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42 |
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43 /** |
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44 * Finds an entity by its integer ID. |
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45 * It is not guaranteed that referenced entities are automatically joined. |
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46 * |
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47 * @param id the id |
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48 * @return the enity or null if there is no such entity |
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49 * @throws SQLException on any kind of SQL errors |
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50 */ |
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51 T find(int id) throws SQLException; |
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52 |
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53 /** |
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54 * Inserts an instance into database. |
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55 * It is not guaranteed that generated fields will be updated in the instance. |
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56 * |
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57 * @param instance the instance to insert |
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58 * @throws SQLException on any kind of SQL errors |
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59 */ |
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60 void save(T instance) throws SQLException; |
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61 |
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62 /** |
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63 * Updates an instance in the database. |
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64 * |
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65 * @param instance the instance to insert |
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66 * @return true if an instance has been updated, false if no instance with the specified ID was found |
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67 * @throws SQLException on any kind of SQL errors |
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68 */ |
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69 boolean update(T instance) throws SQLException; |
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70 |
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71 /** |
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72 * Inserts or updates an instance in the database. |
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73 * Tries an update first and if that fails, performs a save. |
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74 * |
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75 * @param instance the instance to insert or update |
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76 * @throws SQLException on any kind of SQL errors |
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77 * @see #update(Object) |
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78 * @see #save(Object) |
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79 */ |
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80 default void saveOrUpdate(T instance) throws SQLException { |
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81 if (!update(instance)) save(instance); |
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82 } |
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83 } |
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