src/main/kotlin/de/uapcore/lightpit/dao/AbstractDao.kt@86b5d8a1662f (annotated)
src/main/kotlin/de/uapcore/lightpit/dao/AbstractDao.kt
Thu, 19 Nov 2020 13:58:54 +0100
- author
- mike@uapl01.localdomain
- date
- Thu, 19 Nov 2020 13:58:54 +0100
- changeset 159
- 86b5d8a1662f
- permissions
- -rw-r--r--
migrates DAO classes
| mike@159 | 1 | /* |
| mike@159 | 2 | * Copyright 2020 Mike Becker. All rights reserved. |
| mike@159 | 3 | * |
| mike@159 | 4 | * Redistribution and use in source and binary forms, with or without |
| mike@159 | 5 | * modification, are permitted provided that the following conditions are met: |
| mike@159 | 6 | * |
| mike@159 | 7 | * 1. Redistributions of source code must retain the above copyright |
| mike@159 | 8 | * notice, this list of conditions and the following disclaimer. |
| mike@159 | 9 | * |
| mike@159 | 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| mike@159 | 11 | * notice, this list of conditions and the following disclaimer in the |
| mike@159 | 12 | * documentation and/or other materials provided with the distribution. |
| mike@159 | 13 | * |
| mike@159 | 14 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| mike@159 | 15 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| mike@159 | 16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| mike@159 | 17 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
| mike@159 | 18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| mike@159 | 19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| mike@159 | 20 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| mike@159 | 21 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| mike@159 | 22 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| mike@159 | 23 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| mike@159 | 24 | * |
| mike@159 | 25 | */ |
| mike@159 | 26 | |
| mike@159 | 27 | package de.uapcore.lightpit.dao |
| mike@159 | 28 | |
| mike@159 | 29 | import java.sql.PreparedStatement |
| mike@159 | 30 | import java.sql.ResultSet |
| mike@159 | 31 | import java.sql.Types |
| mike@159 | 32 | |
| mike@159 | 33 | abstract class AbstractDao<T> { |
| mike@159 | 34 | |
| mike@159 | 35 | abstract fun mapResult(rs: ResultSet): T |
| mike@159 | 36 | |
| mike@159 | 37 | protected fun list(stmt: PreparedStatement): List<T> { |
| mike@159 | 38 | return sequence { |
| mike@159 | 39 | stmt.executeQuery().use { result -> |
| mike@159 | 40 | while (result.next()) yield(mapResult(result)) |
| mike@159 | 41 | } |
| mike@159 | 42 | }.toList() |
| mike@159 | 43 | } |
| mike@159 | 44 | |
| mike@159 | 45 | protected fun find(stmt: PreparedStatement): T? { |
| mike@159 | 46 | stmt.executeQuery().use { result -> |
| mike@159 | 47 | return if (result.next()) { |
| mike@159 | 48 | mapResult(result) |
| mike@159 | 49 | } else { |
| mike@159 | 50 | null |
| mike@159 | 51 | } |
| mike@159 | 52 | } |
| mike@159 | 53 | } |
| mike@159 | 54 | |
| mike@159 | 55 | // TODO: create PreparedStatement abstraction that provides some features |
| mike@159 | 56 | |
| mike@159 | 57 | // TODO: remove the following legacy code helper function |
| mike@159 | 58 | protected fun <T> setForeignKeyOrNull(stmt: PreparedStatement, index: Int, instance: T?, keyGetter: (obj: T) -> Int) { |
| mike@159 | 59 | if (instance == null) { |
| mike@159 | 60 | stmt.setNull(index, Types.INTEGER) |
| mike@159 | 61 | } else { |
| mike@159 | 62 | stmt.setInt(index, keyGetter(instance)) |
| mike@159 | 63 | } |
| mike@159 | 64 | } |
| mike@159 | 65 | } |
