cfdfedbd2e
* #496 Add pipeline module to parent pom ✨ * #496: Add main application class and test for pipeline * #496: Checkstyle format and add log messages on pipeline stages 🎨 * #496: Fill readme sections of pipeline ✨ * #496: Javadocs and checkstyle formatting 🎨 * #496: Follow PMD checks and add more explanation as block comment on App.java * #496: Apply requested PR changes by iluwatar 🎨 * #970: Replace log4j usage on commander pattern to Slf4j API 🎨 * #970: Replace log4j usage on dao pattern to Slf4j API 🎨 * #970: Replace log4j usage on data mapper pattern to Slf4j API 🎨 * #970: Remove log4j dependency on data transfer object pom 🔥 * #970: Replace log4j usage on module pattern to Slf4j API 🎨 * #970: Replace log4j usage on serverless pattern to Slf4j API 🎨 This also removes the aws log4j dependency * #970: Remove unnecessary gitignore line for log4j.xml 🔥 * #970: Remove remaining remnants of log4j 🔥 * #970: Replace System.out logging with appropriate logging methods 🎨 * #970: Replace System.out method references to Logger::info 🎨
85 lines
3.1 KiB
Java
85 lines
3.1 KiB
Java
/**
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* The MIT License
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* Copyright © 2014-2019 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.datamapper;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.util.Optional;
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/**
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* The Data Mapper (DM) is a layer of software that separates the in-memory objects from the
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* database. Its responsibility is to transfer data between the two and also to isolate them from
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* each other. With Data Mapper the in-memory objects needn't know even that there's a database
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* present; they need no SQL interface code, and certainly no knowledge of the database schema. (The
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* database schema is always ignorant of the objects that use it.) Since it's a form of Mapper ,
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* Data Mapper itself is even unknown to the domain layer.
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* <p>
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* The below example demonstrates basic CRUD operations: Create, Read, Update, and Delete.
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*
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*/
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public final class App {
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private static Logger log = LoggerFactory.getLogger(App.class);
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private static final String STUDENT_STRING = "App.main(), student : ";
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/**
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* Program entry point.
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*
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* @param args command line args.
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*/
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public static void main(final String... args) {
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/* Create new data mapper for type 'first' */
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final StudentDataMapper mapper = new StudentDataMapperImpl();
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/* Create new student */
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Student student = new Student(1, "Adam", 'A');
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/* Add student in respectibe store */
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mapper.insert(student);
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log.debug(STUDENT_STRING + student + ", is inserted");
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/* Find this student */
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final Optional<Student> studentToBeFound = mapper.find(student.getStudentId());
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log.debug(STUDENT_STRING + studentToBeFound + ", is searched");
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/* Update existing student object */
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student = new Student(student.getStudentId(), "AdamUpdated", 'A');
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/* Update student in respectibe db */
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mapper.update(student);
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log.debug(STUDENT_STRING + student + ", is updated");
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log.debug(STUDENT_STRING + student + ", is going to be deleted");
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/* Delete student in db */
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mapper.delete(student);
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}
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private App() {}
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}
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