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Beginning
Entity Framework
Core 2.0
Database Access from .NET
—
Work directly with data through
domain-specic objects and methods
—
Derek J. Rouleau
Beginning Entity
Framework Core 2.0
Database Access from .NET
DerekJ.Rouleau
Beginning Entity Framework Core 2.0
ISBN-13 (pbk): 978-1-4842-3374-0 ISBN-13 (electronic): 978-1-4842-3375-7
https://doi.org/10.1007/978-1-4842-3375-7
Library of Congress Control Number: 2018935922
Copyright © 2018 by Derek J. Rouleau
is work is subject to copyright. All rights are reserved by the Publisher, whether the whole or part of the
material is concerned, specically the rights of translation, reprinting, reuse of illustrations, recitation,
broadcasting, reproduction on microlms or in any other physical way, and transmission or information
storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now
known or hereafter developed.
Trademarked names, logos, and images may appear in this book. Rather than use a trademark symbol with
every occurrence of a trademarked name, logo, or image we use the names, logos, and images only in an
editorial fashion and to the benet of the trademark owner, with no intention of infringement of the
trademark.
e use in this publication of trade names, trademarks, service marks, and similar terms, even if they are not
identied as such, is not to be taken as an expression of opinion as to whether or not they are subject to
proprietary rights.
While the advice and information in this book are believed to be true and accurate at the date of publication,
neither the authors nor the editors nor the publisher can accept any legal responsibility for any errors or
omissions that may be made. e publisher makes no warranty, express or implied, with respect to the
material contained herein.
Managing Director, Apress Media LLC: Welmoed Spahr
Acquisitions Editor: Jonathan Gennick
Development Editor: Laura Berendson
Coordinating Editor: Jill Balzano
Cover designed by eStudioCalamar
Cover image designed by Freepik (www.freepik.com)
Distributed to the book trade worldwide by Springer Science+Business Media NewYork, 233 Spring Street,
6th Floor, NewYork, NY 10013. Phone 1-800-SPRINGER, fax (201) 348-4505, e-mail orders-ny@springer-
sbm.com, or visit www.springeronline.com. Apress Media, LLC is a California LLC and the sole member
(owner) is Springer Science + Business Media Finance Inc (SSBM Finance Inc). SSBM Finance Inc is a
Delaware corporation.
For information on translations, please e-mail rights@apress.com, or visit http://www.apress.com/
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web page at http://www.apress.com/bulk-sales.
Any source code or other supplementary material referenced by the author in this book is available to
readers on GitHub via the book's product page, located at www.apress.com/9781484233740. For more
detailed information, please visit http://www.apress.com/source-code.
Printed on acid-free paper
DerekJ.Rouleau
East Baldwin, Maine, USA
To my best friend Chris and his father Paul Champagne.
If it wasn’t for you two, I may have never gotten
interested in computer science.
v
About the Author ����������������������������������������������������������������������������������������������������� ix
About the Technical Reviewer ��������������������������������������������������������������������������������� xi
Acknowledgments ������������������������������������������������������������������������������������������������� xiii
Introduction �������������������������������������������������������������������������������������������������������������xv
Table of Contents
Chapter 1: Getting Started ���������������������������������������������������������������������������������������� 1
What Is .NET Core ......................................................................................................................... 1
Setting UpYour Application ........................................................................................................... 2
Creating theDatabase andTables (Entities) ................................................................................. 3
Creating theDatabase ........................................................................................................... 19
Adding Data toaTable ................................................................................................................ 21
Retrieving Data fromaDatabase andDisplaying It .................................................................... 31
Deleting Data fromaDatabase ................................................................................................... 33
Deleting aSingle Record ....................................................................................................... 33
Deleting Multiple Records ..................................................................................................... 40
Updating Data inaTable ............................................................................................................. 42
Summary..................................................................................................................................... 45
Chapter 2: Working withMultiple Tables ���������������������������������������������������������������� 49
Adding Data toaTable That Has Foreign Keys............................................................................ 50
Retrieving Data fromMultiple Tables .......................................................................................... 75
Updating Tables ........................................................................................................................... 81
Updating Multiple Records .................................................................................................... 91
Summary..................................................................................................................................... 95
剩余344页未读,继续阅读
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