顯示在 EF Core 6.0 中, INSERT 命令會由命令包裝,以開始並認可交易:輸出 複製 dbug: 9/29/2022 11:43:09.196 RelationalEventId.TransactionStarted[20200] (Microsoft.EntityFrameworkCore.Database.Transaction) Began transaction with isolation level 'ReadCommitted'. info: 9/29/2022 11:43:09.265 ...
EF Core 關聯性對應全都與將關係資料庫中所使用的主鍵/外鍵表示法對應至物件模型中所用對象之間的參考。 從最基本的意義上說,這牽涉到: 將主鍵屬性新增至每個實體類型。 將外鍵屬性新增至一個實體類型。 將實體類型與主鍵與外鍵之間的參考產生關聯,以形成單一關聯性組態。
8.2.2 具有多个 Include 时的性能问题当听到涉及服务器响应时间的性能问题时,问题的根源往往是带有多个 Include 语句的查询。 虽然将相关实体包括在查询中是一项强大的功能,但了解实际上发生的情况很重要。对于包含多个 Include 语句的查询,需要相对较长的时间来通过内部计划编译器生成 store 命令。 大部分时间都花在...
EF Core 1.0.0 introduces some great new capabilities, though overall it does have a smaller feature set than EF6. But this doesn’t mean EF runs only on .NET Core. You can use EF Core in APIs and applications that require the full .NET Framework, as well as those that target only ...
Extends your DbContext with features such as: Include Filter, Auditing, Caching, Query Future, Batch Delete, Batch Update, and more. For EF Core: 2-8. Website|GitHub repository|NuGet Entity Framework Extensions Extends your DbContext with high-performance bulk operations: BulkSaveChanges, BulkIns...
EF Core knows which database to execute migrations on. But your output script files don’t contain this information. Be sure to include it at the top of each of the SQL files, although not the one that’s creating the database. That way you don’t have to worry ...
A common request from EF Core users is to set a default length for all string properties. This can be accomplished in EF7 by writing a convention: Copy public class MaxStringLengthConvention : IModelFinalizingConvention { private readonly int _maxLength; public MaxStringLengthConvention(int maxLeng...
JSON works well for this since modern relational databases include built-in mechanisms for querying and manipulating JSON, such that the JSON column can, effectively, be treated as a table when needed, without the overhead of actually creating that table. Primitive collection properties EF Core ...
Include provider and version information EF Core version: 8.0 Database provider: Microsoft.EntityFrameworkCore.SqlServer Target framework: .NET 8.0 Operating system: Windows 10 IDE: Visual Studio 2022 17.9P1 👍65😕1👀5 Activity Suchiman
An ecological footprint is a measure of the demands made by a person or group of people on global natural resources. It has become one of the most widely used measures of humanity’s effect upon the environment and has been used to highlight both the app