دسترسی نامحدود
برای کاربرانی که ثبت نام کرده اند
برای ارتباط با ما می توانید از طریق شماره موبایل زیر از طریق تماس و پیامک با ما در ارتباط باشید
در صورت عدم پاسخ گویی از طریق پیامک با پشتیبان در ارتباط باشید
برای کاربرانی که ثبت نام کرده اند
درصورت عدم همخوانی توضیحات با کتاب
از ساعت 7 صبح تا 10 شب
دسته بندی: برنامه نويسي ویرایش: 2 نویسندگان: Jon Smith سری: ISBN (شابک) : 1617298360, 9781617298363 ناشر: Manning Publications سال نشر: 2021 تعداد صفحات: 626 زبان: English فرمت فایل : PDF (درصورت درخواست کاربر به PDF، EPUB یا AZW3 تبدیل می شود) حجم فایل: 7 مگابایت
در صورت تبدیل فایل کتاب Entity Framework Core in Action به فرمت های PDF، EPUB، AZW3، MOBI و یا DJVU می توانید به پشتیبان اطلاع دهید تا فایل مورد نظر را تبدیل نمایند.
توجه داشته باشید کتاب Entity Framework Core in Action نسخه زبان اصلی می باشد و کتاب ترجمه شده به فارسی نمی باشد. وبسایت اینترنشنال لایبرری ارائه دهنده کتاب های زبان اصلی می باشد و هیچ گونه کتاب ترجمه شده یا نوشته شده به فارسی را ارائه نمی دهد.
Entity Framework Core in Action، Second Edition یک راهنمای عمیق برای خواندن و نوشتن پایگاه داده با EF Core است. این نسخه که از نسخه اصلی پرفروش بازبینی شده است، با بیش از 100 نمودار، قطعه کد و نمونه پر شده است - از جمله ساختن و مقیاسبندی برنامه وب کتابفروشی خودتان. از تجربه گسترده نویسنده Jon Smith در کار با EF Core در تولید بیاموزید، زیرا الگوهای صرفه جویی در زمان و بهترین شیوه ها برای امنیت، تنظیم عملکرد و تست واحد را کشف می کنید. تمام کدهای کتاب در GitHub موجود است. درباره فناوری Entity Framework دسترسی به داده ها را در برنامه های NET به طور اساسی ساده می کند. این نقشهبردار شی رابطهای (ORM) با کاربری آسان به شما امکان میدهد کد پایگاه داده را در سی شارپ خالص بنویسید. به طور خودکار کلاس ها را به جداول پایگاه داده نگاشت می کند و پرس و جوها را با دستورات استاندارد LINQ فعال می کند. حتی SQL تولید می کند، بنابراین شما مجبور نیستید! درباره کتاب Entity Framework Core in Action، نسخه دوم به شما می آموزد که تعاملات پایگاه داده بی عیب و نقصی را برای برنامه های NET بنویسید. با پیروی از مثال های مرتبط از تجربه گسترده نویسنده Jon Smith، به سرعت از مبانی EF به تکنیک های پیشرفته پیشرفت خواهید کرد. علاوه بر آخرین ویژگی های EF، این کتاب به عملکرد، امنیت، بازسازی و تست واحد می پردازد. این نسخه به روز شده همچنین حاوی مطالب جدیدی در پایگاه داده NoSQL است. آنچه در داخل است EF را برای تعریف هر جدول و ستون پیکربندی کنید با رشد برنامه شما، طرح خود را به روز کنید ادغام EF با برنامه C# موجود منطق کسب و کار را برای دسترسی به پایگاه داده بنویسید و آزمایش کنید استفاده از طراحی دامنه محور در EF Core دریافت بهترین عملکرد از EF Core درباره خواننده برای توسعه دهندگان دات نت که با پایگاه داده های رابطه ای آشنا هستند.
Entity Framework Core in Action, Second Edition is an in-depth guide to reading and writing databases with EF Core. Revised from the bestselling original edition, it’s filled with over 100 diagrams, code snippets, and examples—including building and scaling your own bookselling web application. Learn from author Jon Smith’s extensive experience working with EF Core in production, as you discover time-saving patterns and best practices for security, performance tuning, and unit testing. All of the book’s code is available on GitHub. About the technology Entity Framework radically simplifies data access in .NET applications. This easy-to-use object-relational mapper (ORM) lets you write database code in pure C#. It automatically maps classes to database tables and enables queries with standard LINQ commands. It even generates SQL, so you don’t have to! About the book Entity Framework Core in Action, Second Edition teaches you to write flawless database interactions for .NET applications. Following relevant examples from author Jon Smith’s extensive experience, you’ll progress quickly from EF basics to advanced techniques. In addition to the latest EF features, this book addresses performance, security, refactoring, and unit testing. This updated edition also contains new material on NoSQL databases. What's inside Configure EF to define every table and column Update your schema as your app grows Integrating EF with existing C# application Write and test business logic for database access Applying a Domain-Driven Design to EF Core Getting the best performance out of EF Core About the reader For .NET developers familiar with relational databases.
Entity Framework Core in Action contents foreword preface acknowledgments about this book Who should read this book? How this book is organized About the code Code conventions liveBook discussion forum Online resources about the author about the cover illustration Part 1—Getting started 1 Introduction to Entity Framework Core 1.1 What you’ll learn from this book 1.2 My “lightbulb moment” with Entity Framework 1.3 Some words for existing EF6.x developers 1.4 An overview of EF Core 1.4.1 The downsides of O/RMs 1.5 What about NoSQL? 1.6 Your first EF Core application 1.6.1 What you need to install 1.6.2 Creating your own .NET Core console app with EF Core 1.7 The database that MyFirstEfCoreApp will access 1.8 Setting up the MyFirstEfCoreApp application 1.8.1 The classes that map to the database: Book and Author 1.8.2 The application’s DbContext 1.9 Looking under the hood of EF Core 1.9.1 Modeling the database 1.9.2 Reading data from the database 1.9.3 Updating the database 1.10 The stages of development of EF Core 1.11 Should you use EF Core in your next project? 1.11.1 .NET is the future software platform, and it’s fast! 1.11.2 Open source and open communication 1.11.3 Multiplatform applications and development 1.11.4 Rapid development and good features 1.11.5 Well supported 1.11.6 Always high-performance 1.12 When should you not use EF Core? Summary 2 Querying the database 2.1 Setting the scene: Our book-selling site 2.1.1 The Book App’s relational database 2.1.2 Other relationship types not covered in this chapter 2.1.3 The database showing all the tables 2.1.4 The classes that EF Core maps to the database 2.2 Creating the application’s DbContext 2.2.1 Defining the application’s DbContext: EfCoreContext 2.2.2 Creating an instance of the application’s DbContext 2.2.3 Creating a database for your own application 2.3 Understanding database queries 2.3.1 Application’s DbContext property access 2.3.2 A series of LINQ/EF Core commands 2.3.3 The execute command 2.3.4 The two types of database queries 2.4 Loading related data 2.4.1 Eager loading: Loading relationships with the primary entity class 2.4.2 Explicit loading: Loading relationships after the primary entity class 2.4.3 Select loading: Loading specific parts of primary entity class and any relationships 2.4.4 Lazy loading: Loading relationships as required 2.5 Using client vs. server evaluation: Adapting data at the last stage of a query 2.6 Building complex queries 2.7 Introducing the architecture of the Book App 2.8 Adding sorting, filtering, and paging 2.8.1 Sorting books by price, publication date, and customer ratings 2.8.2 Filtering books by publication year, categories, and customer ratings 2.8.3 Other filtering options: Searching text for a specific string 2.8.4 Paging the books in the list 2.9 Putting it all together: Combining Query Objects Summary 3 Changing the database content 3.1 Introducing EF Core’s entity State 3.2 Creating new rows in a table 3.2.1 Creating a single entity on its own 3.2.2 Creating a book with a review 3.3 Updating database rows 3.3.1 Handling disconnected updates in a web application 3.4 Handling relationships in updates 3.4.1 Principal and dependent relationships 3.4.2 Updating one-to-one relationships: Adding a PriceOffer to a book 3.4.3 Updating one-to-many relationships: Adding a review to a book 3.4.4 Updating a many-to-many relationship 3.4.5 Advanced feature: Updating relationships via foreign keys 3.5 Deleting entities 3.5.1 Soft-delete approach: Using a global query filter to hide entities 3.5.2 Deleting a dependent-only entity with no relationships 3.5.3 Deleting a principal entity that has relationships 3.5.4 Deleting a book with its dependent relationships Summary 4 Using EF Core in business logic 4.1 The questions to ask and the decisions you need to make before you start coding 4.1.1 The three levels of complexity of your business logic code 4.2 Complex business logic example: Processing an order for books 4.3 Using a design pattern to implement complex business logic 4.3.1 Five guidelines for building business logic that uses EF Core 4.4 Implementing the business logic for processing an order 4.4.1 Guideline 1: Business logic has first call on defining the database structure 4.4.2 Guideline 2: Business logic should have no distractions 4.4.3 Guideline 3: Business logic should think that it’s working on in-memory data 4.4.4 Guideline 4: Isolate the database access code into a separate project 4.4.5 Guideline 5: Business logic shouldn’t call EF Core’s SaveChanges 4.4.6 Putting it all together: Calling the order-processing business logic 4.4.7 Placing an order in the Book App 4.4.8 The pros and cons of the complex business logic pattern 4.5 Simple business logic example: ChangePriceOfferService 4.5.1 My design approach for simple business logic 4.5.2 Writing the ChangePriceOfferService code 4.5.3 The pros and cons of this business logic pattern 4.6 Validation business logic example: Adding review to a book, with checks 4.6.1 The pros and cons of this business logic pattern 4.7 Adding extra features to your business logic handling 4.7.1 Validating the data that you write to the database 4.7.2 Using transactions to daisy-chain a sequence of business logic code 4.7.3 Using the RunnerTransact2WriteDb class Summary 5 Using EF Core in ASP.NET Core web applications 5.1 Introducing ASP.NET Core 5.2 Understanding the architecture of the Book App 5.3 Understanding dependency injection 5.3.1 Why you need to learn about DI in ASP.NET Core 5.3.2 A basic example of dependency injection in ASP.NET Core 5.3.3 The lifetime of a service created by DI 5.3.4 Special considerations for Blazor Server applications 5.4 Making the application’s DbContext available via DI 5.4.1 Providing information on the database’s location 5.4.2 Registering your application’s DbContext with the DI provider 5.4.3 Registering a DbContext Factory with the DI provider 5.5 Calling your database access code from ASP.NET Core 5.5.1 A summary of how ASP.NET Core MVC works and the terms it uses 5.5.2 Where does the EF Core code live in the Book App? 5.6 Implementing the book list query page 5.6.1 Injecting an instance of the application’s DbContext via DI 5.6.2 Using the DbContext Factory to create an instance of a DbContext 5.7 Implementing your database methods as a DI service 5.7.1 Registering your class as a DI service 5.7.2 Injecting ChangePubDateService into the ASP.NET action method 5.7.3 Improving registering your database access classes as services 5.8 Deploying an ASP.NET Core application with a database 5.8.1 Knowing where the database is on the web server 5.8.2 Creating and migrating the database 5.9 Using EF Core’s migration feature to change the database’s structure 5.9.1 Updating your production database 5.9.2 Having your application migrate your database on startup 5.10 Using async/await for better scalability 5.10.1 Why async/await is useful in a web application using EF Core 5.10.2 Where should you use async/await with database accesses? 5.10.3 Changing over to async/await versions of EF Core commands 5.11 Running parallel tasks: How to provide the DbContext 5.11.1 Obtaining an instance of your application’s DbContext to run in parallel 5.11.2 Running a background service in ASP.NET Core 5.11.3 Other ways of obtaining a new instance of the application’s DbContext Summary 6 Tips and techniques for reading and writing with EF Core 6.1 Reading from the database 6.1.1 Exploring the relational fixup stage in a query 6.1.2 Understanding what AsNoTracking and its variant do 6.1.3 Reading in hierarchical data efficiently 6.1.4 Understanding how the Include method works 6.1.5 Making loading navigational collections fail-safe 6.1.6 Using Global Query Filters in real-world situations 6.1.7 Considering LINQ commands that need special attention 6.1.8 Using AutoMapper to automate building Select queries 6.1.9 Evaluating how EF Core creates an entity class when reading data in 6.2 Writing to the database with EF Core 6.2.1 Evaluating how EF Core writes entities/relationships to the database 6.2.2 Evaluating how DbContext handles writing out entities/relationships 6.2.3 A quick way to copy data with relationships 6.2.4 A quick way to delete an entity Summary Part 2—Entity Framework in depth 7 Configuring nonrelational properties 7.1 Three ways of configuring EF Core 7.2 A worked example of configuring EF Core 7.3 Configuring by convention 7.3.1 Conventions for entity classes 7.3.2 Conventions for parameters in an entity class 7.3.3 Conventions for name, type, and size 7.3.4 By convention, the nullability of a property is based on .NET type 7.3.5 An EF Core naming convention identifies primary keys 7.4 Configuring via Data Annotations 7.4.1 Using annotations from System.ComponentModel.DataAnnotations 7.4.2 Using annotations from System.ComponentModel.DataAnnotations.Schema 7.5 Configuring via the Fluent API 7.6 Excluding properties and classes from the database 7.6.1 Excluding a class or property via Data Annotations 7.6.2 Excluding a class or property via the Fluent API 7.7 Setting database column type, size, and nullability 7.8 Value conversions: Changing data to/from the database 7.9 The different ways of configuring the primary key 7.9.1 Configuring a primary key via Data Annotations 7.9.2 Configuring a primary key via the Fluent API 7.9.3 Configuring an entity as read-only 7.10 Adding indexes to database columns 7.11 Configuring the naming on the database side 7.11.1 Configuring table names 7.11.2 Configuring the schema name and schema groupings 7.11.3 Configuring the database column names in a table 7.12 Configuring Global Query Filters 7.13 Applying Fluent API commands based on the database provider type 7.14 Shadow properties: Hiding column data inside EF Core 7.14.1 Configuring shadow properties 7.14.2 Accessing shadow properties 7.15 Backing fields: Controlling access to data in an entity class 7.15.1 Creating a simple backing field accessed by a read/write property 7.15.2 Creating a read-only column 7.15.3 Concealing a person’s date of birth: Hiding data inside a class 7.15.4 Configuring backing fields 7.16 Recommendations for using EF Core’s configuration 7.16.1 Use By Convention configuration first 7.16.2 Use validation Data Annotations wherever possible 7.16.3 Use the Fluent API for anything else 7.16.4 Automate adding Fluent API commands by class/property signatures Summary 8 Configuring relationships 8.1 Defining some relationship terms 8.2 What navigational properties do you need? 8.3 Configuring relationships 8.4 Configuring relationships By Convention 8.4.1 What makes a class an entity class? 8.4.2 An example of an entity class with navigational properties 8.4.3 How EF Core finds foreign keys By Convention 8.4.4 Nullability of foreign keys: Required or optional dependent relationships 8.4.5 Foreign keys: What happens if you leave them out? 8.4.6 When does By Convention configuration not work? 8.5 Configuring relationships by using Data Annotations 8.5.1 The ForeignKey Data Annotation 8.5.2 The InverseProperty Data Annotation 8.6 Fluent API relationship configuration commands 8.6.1 Creating a one-to-one relationship 8.6.2 Creating a one-to-many relationship 8.6.3 Creating a many-to-many relationship 8.7 Controlling updates to collection navigational properties 8.8 Additional methods available in Fluent API relationships 8.8.1 OnDelete: Changing the delete action of a dependent entity 8.8.2 IsRequired: Defining the nullability of the foreign key 8.8.3 HasPrincipalKey: Using an alternate unique key 8.8.4 Less-used options in Fluent API relationships 8.9 Alternative ways of mapping entities to database tables 8.9.1 Owned types: Adding a normal class into an entity class 8.9.2 Table per hierarchy (TPH): Placing inherited classes into one table 8.9.3 Table per Type (TPT): Each class has its own table 8.9.4 Table splitting: Mapping multiple entity classes to the same table 8.9.5 Property bag: Using a dictionary as an entity class Summary 9 Handling database migrations 9.1 How this chapter is organized 9.2 Understanding the complexities of changing your application’s database 9.2.1 A view of what databases need updating 9.2.2 Handling a migration that can lose data 9.3 Part 1: Introducing the three approaches to creating a migration 9.4 Creating a migration by using EF Core’s add migration command 9.4.1 Requirements before running any EF Core migration command 9.4.2 Running the add migration command 9.4.3 Seeding your database via an EF Core migration 9.4.4 Handling EF Core migrations with multiple developers 9.4.5 Using a custom migration table to allow multiple DbContexts to one database 9.5 Editing an EF Core migration to handle complex situations 9.5.1 Adding and removing MigrationBuilder methods inside the migration class 9.5.2 Adding SQL commands to a migration 9.5.3 Adding your own custom migration commands 9.5.4 Altering a migration to work for multiple database types 9.6 Using SQL scripts to build migrations 9.6.1 Using SQL database comparison tools to produce migration 9.6.2 Handcoding SQL change scripts to migrate the database 9.6.3 Checking that your SQL change scripts matches EF Core’s database model 9.7 Using EF Core’s reverse-engineering tool 9.7.1 Running EF Core’s reverse-engineering command 9.7.2 Installing and running EF Core Power Tools reverse-engineering command 9.7.3 Updating your entity classes and DbContext when the database changes 9.8 Part 2: Applying your migrations to a database 9.8.1 Calling EF Core’s Database.Migrate method from your main application 9.8.2 Executing EF Core’s Database.Migrate method from a standalone application 9.8.3 Applying an EF Core’s migration via an SQL change script 9.8.4 Applying SQL change scripts by using a migration tool 9.9 Migrating a database while the application is running 9.9.1 Handling a migration that doesn’t contain an application-breaking change 9.9.2 Handling application-breaking changes when you can’t stop the app Summary 10 Configuring advanced features and handling concurrency conflicts 10.1 DbFunction: Using user-defined functions (UDFs) with EF Core 10.1.1 Configuring a scalar-valued UDF 10.1.2 Configuring a table-valued UDF 10.1.3 Adding your UDF code to the database 10.1.4 Using a registered UDF in your database queries 10.2 Computed column: A dynamically calculated column value 10.3 Setting a default value for a database column 10.3.1 Using the HasDefaultValue method to add a constant value for a column 10.3.2 Using the HasDefaultValueSql method to add an SQL command for a column 10.3.3 Using the HasValueGenerator method to assign a value generator to a property 10.4 Sequences: Providing numbers in a strict order 10.5 Marking database-generated properties 10.5.1 Marking a column that’s generated on an addition or update 10.5.2 Marking a column’s value as set on insert of a new row 10.5.3 Marking a column/property as “normal” 10.6 Handling simultaneous updates: Concurrency conflicts 10.6.1 Why do concurrency conflicts matter? 10.6.2 EF Core’s concurrency conflict–handling features 10.6.3 Handling a DbUpdateConcurrencyException 10.6.4 The disconnected concurrent update issue Summary 11 Going deeper into the DbContext 11.1 Overview of the DbContext class’s properties 11.2 Understanding how EF Core tracks changes 11.3 Looking at commands that change an entity’s State 11.3.1 The Add command: Inserting a new row into the database 11.3.2 The Remove method: Deleting a row from the database 11.3.3 Modifying an entity class by changing the data in that entity class 11.3.4 Modifying an entity class by calling the Update method 11.3.5 The Attach method: Start tracking an existing untracked entity class 11.3.6 Setting the State of an entity directly 11.3.7 TrackGraph: Handling disconnected updates with relationships 11.4 SaveChanges and its use of ChangeTracker.DetectChanges 11.4.1 How SaveChanges finds all the State changes 11.4.2 What to do if ChangeTracker.DetectChanges is taking too long 11.4.3 Using the entities’ State within the SaveChanges method 11.4.4 Catching entity class’s State changes via events 11.4.5 Triggering events when SaveChanges/SaveChangesAsync is called 11.4.6 EF Core interceptors 11.5 Using SQL commands in an EF Core application 11.5.1 FromSqlRaw/FromSqlInterpolated: Using SQL in an EF Core query 11.5.2 ExecuteSqlRaw/ExecuteSqlInterpolated: Executing a nonquery command 11.5.3 AsSqlQuery Fluent API method: Mapping entity classes to queries 11.5.4 Reload: Used after ExecuteSql commands 11.5.5 GetDbConnection: Running your own SQL commands 11.6 Accessing information about the entity classes and database tables 11.6.1 Using context.Entry(entity).Metadata to reset primary keys 11.6.2 Using context.Model to get database information 11.7 Dynamically changing the DbContext’s connection string 11.8 Handling database connection problems 11.8.1 Handling database transactions with EF Core’s execution strategy 11.8.2 Altering or writing your own execution strategy Summary Part 3—Using Entity Framework Core in real-world applications 12 Using entity events to solve business problems 12.1 Using events to solve business problems 12.1.1 Example of using domain events 12.1.2 Example of integration events 12.2 Defining where domain events and integration events are useful 12.3 Where might you use events with EF Core? 12.3.1 Pro: Follows the SoC design principle 12.3.2 Pro: Makes database updates robust 12.3.3 Con: Makes your application more complex 12.3.4 Con: Makes following the flow of the code more difficult 12.4 Implementing a domain event system with EF Core 12.4.1 Create some domain events classes to be triggered 12.4.2 Add code to the entity classes to hold the domain events 12.4.3 Alter the entity class to detect a change to trigger an event on 12.4.4 Create event handlers that are matched to the domain events 12.4.5 Build an Event Runner that finds and runs the correct event handler 12.4.6 Override SaveChanges and insert the Event Runner before SaveChanges is called 12.4.7 Register the Event Runner and all the event handlers 12.5 Implementing an integration event system with EF Core 12.5.1 Building a service that communicates with the warehouse 12.5.2 Overriding SaveChanges to handle the integration event 12.6 Improving the domain event and integration event implementations 12.6.1 Generalizing events: Running before, during, and after the call to SaveChanges 12.6.2 Adding support for async event handlers 12.6.3 Handling multiple event handers for the same event 12.6.4 Handling event sagas in which one event kicks off another event Summary 13 Domain-Driven Design and other architectural approaches 13.1 A good software architecture makes it easier to build and maintain your application 13.2 The Book App’s evolving architecture 13.2.1 Building a modular monolith to enforce the SoC principles 13.2.2 Using DDD principles both architecturally and on the entity classes 13.2.3 Applying a clean architecture as described by Robert C. Martin 13.3 Introduction to DDD at the entity class level 13.4 Altering the Book App entities to follow the DDD approach 13.4.1 Changing the properties in the Book entity to read-only 13.4.2 Updating the Book entity properties via methods in the entity class 13.4.3 Controlling how the Book entity is created 13.4.4 Understanding the differences between an entity and a value object 13.4.5 Minimizing the relationships between entity classes 13.4.6 Grouping entity classes 13.4.7 Deciding when the business logic shouldn’t be run inside an entity 13.4.8 Applying DDD’s bounded context to your application’s DbContext 13.5 Using your DDD-styled entity classes in your application 13.5.1 Calling the AddPromotion access method via a repository pattern 13.5.2 Calling the AddPromotion access method via a class-to-method-call library 13.5.3 Adding a Review to the Book entity class via a repository pattern 13.5.4 Adding a Review to the Book entity class via a class-to-method-call library 13.6 The downside of DDD entities: Too many access methods 13.7 Getting around performance issues in DDD-styled entities 13.7.1 Allow database code into your entity classes 13.7.2 Make the Review constructor public and write nonentity code to add a Review 13.7.3 Use domain events to ask an event handler to add a review to the database 13.8 Three architectural approaches: Did they work? 13.8.1 A modular monolith approach that enforces SoC by using projects 13.8.2 DDD principles, both architecturally and on the entity classes 13.8.3 Clean architecture as described by Robert C. Martin Summary 14 EF Core performance tuning 14.1 Part 1: Deciding which performance issues to fix 14.1.1 “Don’t performance-tune too early” doesn’t mean you stop thinking 14.1.2 How do you decide what’s slow and needs performance tuning? 14.1.3 The cost of finding and fixing performance issues 14.2 Part 2: Techniques for diagnosing a performance issue 14.2.1 Stage 1: Get a good overview, measuring the user’s experience 14.2.2 Stage 2: Find all the database code involved in the feature you’re tuning 14.2.3 Stage 3: Inspect the SQL code to find poor performance 14.3 Part 3: Techniques for fixing performance issues 14.4 Using good patterns makes your application perform well 14.4.1 Using Select loading to load only the columns you need 14.4.2 Using paging and/or filtering of searches to reduce the rows you load 14.4.3 Warning: Lazy loading will affect database performance 14.4.4 Always adding the AsNoTracking method to read-only queries 14.4.5 Using the async version of EF Core commands to improve scalability 14.4.6 Ensuring that your database access code is isolated/decoupled 14.5 Performance antipatterns: Database queries 14.5.1 Antipattern: Not minimizing the number of calls to the database 14.5.2 Antipattern: Missing indexes from a property that you want to search on 14.5.3 Antipattern: Not using the fastest way to load a single entity 14.5.4 Antipattern: Allowing too much of a data query to be moved into the software side 14.5.5 Antipattern: Not moving calculations into the database 14.5.6 Antipattern: Not replacing suboptimal SQL in a LINQ query 14.5.7 Antipattern: Not precompiling frequently used queries 14.6 Performance antipatterns: Writes 14.6.1 Antipattern: Calling SaveChanges multiple times 14.6.2 Antipattern: Making DetectChanges work too hard 14.6.3 Antipattern: Not using HashSetfor navigational collection properties 14.6.4 Antipattern: Using the Update method when you want to change only part of the entity 14.6.5 Antipattern: Startup issue—Using one large DbContext 14.7 Performance patterns: Scalability of database accesses 14.7.1 Using pooling to reduce the cost of a new application’s DbContext 14.7.2 Adding scalability with little effect on overall speed 14.7.3 Helping your database scalability by making your queries simple 14.7.4 Scaling up the database server 14.7.5 Picking the right architecture for applications that need high scalability Summary 15 Master class on performance-tuning database queries 15.1 The test setup and a summary of the four performance approaches 15.2 Good LINQ approach: Using an EF Core Select query 15.3 LINQ+UDFs approach: Adding some SQL to your LINQ code 15.4 SQL+Dapper: Creating your own SQL 15.5 LINQ+caching approach: Precalculating costly query parts 15.5.1 Adding a way to detect changes that affect the cached values 15.5.2 Adding code to update the cached values 15.5.3 Adding cache properties to the Book entity with concurrency handling 15.5.4 Adding a checking/healing system to your event system 15.6 Comparing the four performance approaches with development effort 15.7 Improving database scalability Summary 16 Cosmos DB, CQRS, and other database types 16.1 The differences between relational and NoSQL databases 16.2 Introduction to Cosmos DB and its EF Core provider 16.3 Building a Command and Query Responsibility Segregation (CQRS) system using Cosmos DB 16.4 The design of a two-database CQRS architecture application 16.4.1 Creating an event to trigger when the SQL Book entity changes 16.4.2 Adding events to the Book entity send integration events 16.4.3 Using the EfCore.GenericEventRunner to override your BookDbContext 16.4.4 Creating the Cosmos entity classes and DbContext 16.4.5 Creating the Cosmos event handlers 16.5 Understanding the structure and data of a Cosmos DB account 16.5.1 The Cosmos DB structure as seen from EF Core 16.5.2 How the CosmosClass is stored in Cosmos DB 16.6 Displaying books via Cosmos DB 16.6.1 Cosmos DB differences from relational databases 16.6.2 Cosmos DB/EF Core difference: Migrating a Cosmos database 16.6.3 EF Core 5 Cosmos DB database provider limitations 16.7 Was using Cosmos DB worth the effort? Yes! 16.7.1 Evaluating the performance of the two-database CQRS in the Book App 16.7.2 Fixing the features that EF Core 5 Cosmos DB database provider couldn’t handle 16.7.3 How difficult would it be to use this two-database CQRS design in your application? 16.8 Differences in other database types Summary 17 Unit testing EF Core applications 17.1 An introduction to the unit test setup 17.1.1 The test environment: xUnit unit test library 17.1.2 A library I created to help with unit testing EF Core applications 17.2 Getting your application’s DbContext ready for unit testing 17.2.1 The application’s DbContext options are provided via its constructor 17.2.2 Setting an application’s DbContext options via OnConfiguring 17.3 Three ways to simulate the database when testing EF Core applications 17.4 Choosing between a production-type database and an SQLite in-memory database 17.5 Using a production-type database in your unit tests 17.5.1 Providing a connection string to the database to use for the unit test 17.5.2 Providing a database per test class to allow xUnit to run tests in parallel 17.5.3 Making sure that the database’s schema is up to date and the database is empty 17.5.4 Mimicking the database setup that EF Core migration would deliver 17.6 Using an SQLite in-memory database for unit testing 17.7 Stubbing or mocking an EF Core database 17.8 Unit testing a Cosmos DB database 17.9 Seeding a database with test data to test your code correctly 17.10 Solving the problem of one database access breaking another stage of your test 17.10.1 Test code using ChangeTracker.Clear in a disconnected state 17.10.2 Test code by using multiple DbContext instances in a disconnected state 17.11 Capturing the database commands sent to a database 17.11.1 Using the LogTo option extension to filter and capture EF Core logging 17.11.2 Using the ToQueryString method to show the SQL generated from a LINQ query Summary Appendix A—A brief introduction to LINQ A.1 An introduction to the LINQ language A.1.1 The two ways you can write LINQ queries A.1.2 The data operations you can do with LINQ A.2 Introduction to IQueryable type, and why it’s useful A.2.1 Splitting up a complex LINQ query by using the IQueryable type A.2.2 How EF Core translates IQueryable into database code A.3 Querying an EF Core database by using LINQ index A B C D E F G H I K L M N O P Q R S T U V W X