1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/main/kotlin/de/uapcore/lightpit/dao/AbstractDao.kt Thu Nov 19 13:58:54 2020 +0100
1.3 @@ -0,0 +1,65 @@
1.4 +/*
1.5 + * Copyright 2020 Mike Becker. All rights reserved.
1.6 + *
1.7 + * Redistribution and use in source and binary forms, with or without
1.8 + * modification, are permitted provided that the following conditions are met:
1.9 + *
1.10 + * 1. Redistributions of source code must retain the above copyright
1.11 + * notice, this list of conditions and the following disclaimer.
1.12 + *
1.13 + * 2. Redistributions in binary form must reproduce the above copyright
1.14 + * notice, this list of conditions and the following disclaimer in the
1.15 + * documentation and/or other materials provided with the distribution.
1.16 + *
1.17 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
1.18 + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.19 + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
1.20 + * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
1.21 + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
1.22 + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
1.23 + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
1.24 + * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
1.25 + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
1.26 + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.27 + *
1.28 + */
1.29 +
1.30 +package de.uapcore.lightpit.dao
1.31 +
1.32 +import java.sql.PreparedStatement
1.33 +import java.sql.ResultSet
1.34 +import java.sql.Types
1.35 +
1.36 +abstract class AbstractDao<T> {
1.37 +
1.38 + abstract fun mapResult(rs: ResultSet): T
1.39 +
1.40 + protected fun list(stmt: PreparedStatement): List<T> {
1.41 + return sequence {
1.42 + stmt.executeQuery().use { result ->
1.43 + while (result.next()) yield(mapResult(result))
1.44 + }
1.45 + }.toList()
1.46 + }
1.47 +
1.48 + protected fun find(stmt: PreparedStatement): T? {
1.49 + stmt.executeQuery().use { result ->
1.50 + return if (result.next()) {
1.51 + mapResult(result)
1.52 + } else {
1.53 + null
1.54 + }
1.55 + }
1.56 + }
1.57 +
1.58 + // TODO: create PreparedStatement abstraction that provides some features
1.59 +
1.60 + // TODO: remove the following legacy code helper function
1.61 + protected fun <T> setForeignKeyOrNull(stmt: PreparedStatement, index: Int, instance: T?, keyGetter: (obj: T) -> Int) {
1.62 + if (instance == null) {
1.63 + stmt.setNull(index, Types.INTEGER)
1.64 + } else {
1.65 + stmt.setInt(index, keyGetter(instance))
1.66 + }
1.67 + }
1.68 +}
1.69 \ No newline at end of file
