LightPIT: src/main/java/de/uapcore/lightpit/dao/Functions.java@822b7e3d064d (annotated)

src/main/java/de/uapcore/lightpit/dao/Functions.java@822b7e3d064d (annotated)

src/main/java/de/uapcore/lightpit/dao/Functions.java

Fri, 23 Oct 2020 20:34:57 +0200

author: Mike Becker <universe@uap-core.de>
date: Fri, 23 Oct 2020 20:34:57 +0200
changeset 150: 822b7e3d064d
parent 138: e2aa673dd473
permissions: -rw-r--r--

migrate entities package

 /*
  * 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.*;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;
 import java.util.function.Function;
 /**
  * Some DAO utilities.
  */
 public final class Functions {
     public static String getSafeString(ResultSet rs, String column) throws SQLException {
         return Optional.ofNullable(rs.getString(column)).orElse("");
     }
     public static 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);
         }
     }
     public static void setDateOrNull(PreparedStatement stmt, int index, Date date) throws SQLException {
         if (date == null) {
             stmt.setNull(index, Types.DATE);
         } else {
             stmt.setDate(index, date);
         }
     }
     public static <T> void setForeignKeyOrNull(PreparedStatement stmt, int index, T instance, Function<? super 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);
         }
     }
     @FunctionalInterface
     public interface ResultSetMapper<T> {
         T apply(ResultSet rs) throws SQLException;
     }
     public static <T> List<T> list(PreparedStatement stmt, ResultSetMapper<T> mapper) throws SQLException {
         List<T> results = new ArrayList<>();
         try (var result = stmt.executeQuery()) {
             while (result.next()) {
                 final var project = mapper.apply(result);
                 results.add(project);
             }
         }
         return results;
     }
     public static <T> T find(PreparedStatement stmt, ResultSetMapper<T> mapper) throws SQLException {
         try (var result = stmt.executeQuery()) {
             if (result.next()) {
                 final var ent = mapper.apply(result);
                 return ent;
             } else {
                 return null;
             }
         }
     }
     private Functions() {
     }
 }

Mercurial > hg > LightPIT / annotate

src/main/java/de/uapcore/lightpit/dao/Functions.java@822b7e3d064d (annotated)

src/main/java/de/uapcore/lightpit/dao/Functions.java