Mon, 11 May 2020 19:09:06 +0200
adds DAO for Project entity and save/update methods
/* * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. * * Copyright 2018 Mike Becker. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * */ package de.uapcore.lightpit.dao; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Types; import java.util.ArrayList; import java.util.List; import java.util.Optional; import java.util.function.Function; public abstract class AbstractDao<T> implements GenericDao<T> { private final PreparedStatement listQuery; protected AbstractDao(PreparedStatement listQuery) { this.listQuery = listQuery; } public final T mapColumns(ResultSet result) throws SQLException { return mapColumns(result, ""); } public abstract T mapColumns(ResultSet result, String qualifier) throws SQLException; /** * Qualifies a column label if an qualifier is specified. * * @param qualifier an optional qualifier * @param label the column label * @return the label, qualified if necessary */ protected final String qual(String qualifier, String label) { if (qualifier == null || qualifier.isBlank()) { return label; } else { return qualifier + "." + label; } } protected final void setStringOrNull(PreparedStatement stmt, int index, String str) throws SQLException { if (str == null || str.isBlank()) { stmt.setNull(index, Types.VARCHAR); } else { stmt.setString(index, str); } } protected final <T> void setForeignKeyOrNull(PreparedStatement stmt, int index, T instance, Function<T, Integer> keyGetter) throws SQLException { Integer key = Optional.ofNullable(instance).map(keyGetter).orElse(null); if (key == null) { stmt.setNull(index, Types.INTEGER); } else { stmt.setInt(index, key); } } @Override public List<T> list() throws SQLException { List<T> list = new ArrayList<>(); try (ResultSet result = listQuery.executeQuery()) { while (result.next()) { list.add(mapColumns(result)); } } return list; } }