comparison: src/main/kotlin/de/uapcore/lightpit/dao/AbstractDao.kt
src/main/kotlin/de/uapcore/lightpit/dao/AbstractDao.kt
- changeset 159
- 86b5d8a1662f
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| 158:4f912cd42876 | 159:86b5d8a1662f |
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| 1 /* | |
| 2 * Copyright 2020 Mike Becker. All rights reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions are met: | |
| 6 * | |
| 7 * 1. Redistributions of source code must retain the above copyright | |
| 8 * notice, this list of conditions and the following disclaimer. | |
| 9 * | |
| 10 * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 * notice, this list of conditions and the following disclaimer in the | |
| 12 * documentation and/or other materials provided with the distribution. | |
| 13 * | |
| 14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
| 15 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
| 17 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE | |
| 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
| 20 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | |
| 21 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | |
| 22 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 24 * | |
| 25 */ | |
| 26 | |
| 27 package de.uapcore.lightpit.dao | |
| 28 | |
| 29 import java.sql.PreparedStatement | |
| 30 import java.sql.ResultSet | |
| 31 import java.sql.Types | |
| 32 | |
| 33 abstract class AbstractDao<T> { | |
| 34 | |
| 35 abstract fun mapResult(rs: ResultSet): T | |
| 36 | |
| 37 protected fun list(stmt: PreparedStatement): List<T> { | |
| 38 return sequence { | |
| 39 stmt.executeQuery().use { result -> | |
| 40 while (result.next()) yield(mapResult(result)) | |
| 41 } | |
| 42 }.toList() | |
| 43 } | |
| 44 | |
| 45 protected fun find(stmt: PreparedStatement): T? { | |
| 46 stmt.executeQuery().use { result -> | |
| 47 return if (result.next()) { | |
| 48 mapResult(result) | |
| 49 } else { | |
| 50 null | |
| 51 } | |
| 52 } | |
| 53 } | |
| 54 | |
| 55 // TODO: create PreparedStatement abstraction that provides some features | |
| 56 | |
| 57 // TODO: remove the following legacy code helper function | |
| 58 protected fun <T> setForeignKeyOrNull(stmt: PreparedStatement, index: Int, instance: T?, keyGetter: (obj: T) -> Int) { | |
| 59 if (instance == null) { | |
| 60 stmt.setNull(index, Types.INTEGER) | |
| 61 } else { | |
| 62 stmt.setInt(index, keyGetter(instance)) | |
| 63 } | |
| 64 } | |
| 65 } |
