答案:exec sp_rename 'teacher.idx_nameAndgender' ,'multi_index', index (4).删除索引:DROP INDEX 表名.索引名 例如:删除表teacher中的索引 multi_index 答案:DROP INDEX teacher.multi_index 注:DROP INDEX 命令不能删除由 CREATE TABLE或者ALTER TABLE命令创建的主键(PRIMARY KEY)或者唯一性(UNIQUE)约束索引...
EF7 接著會在傳送此數據表的插入和更新命令時還原為 EF Core 6.0 SQL。如需詳細資訊,包括使用觸發程式自動設定所有對應數據表的慣例,請參閱 EF7 重大變更檔中具有觸發程式的 SQL Server 數據表現在需要特殊的 EF Core 設定。插入圖形的往返次數較少請考慮插入包含新主體實體的實體圖表,以及具有參考新主體之外鍵...
protected override void OnModelCreating(ModelBuilder modelBuilder) => modelBuilder.Entity<MultitenantContact>() 這可確保每個查詢都會在每個要求上篩選至租使用者。 應用程式程式代碼中不需要篩選,因為會自動套用全域篩選。租使用者提供者,並 DbContextFactory 設定在應用程式啟動時,如下所示,使用 Sqlite 作為範例:C#...
/// public partial class Blog { /// /// The primary key. /// [Key] public int Id { get; set; } } LINQ 查詢增強功能EF Core 6.0 包含 LINQ 查詢翻譯和執行的數項改善。改善GroupBy 支援GitHub 問題: #12088 、 #13805 和 #22609 。EF Core 6.0 包含更佳的 GroupBy 查詢支援。 具體來...
方法使用租户列?使用每租户架构?使用多个数据库?EF Core 支持 鉴别器(列)是否否全局查询筛选器 每个租户一个数据库否No是配置 每租户架构否是否不支持 对于每租户数据库方法,切换到正确的数据库就像提供正确的连接字符串一样简单。 当数据存储在单个数据库中时,可以使用全局查询筛选器按租户 ID 列自动筛选行,确保...
Allow Multi-region or Application Preferred Regions in EF Core Cosmos Use C# structs or classes as value objects Support primitive collections in the compiled model Migrations and model snapshot for primitive collections Switch to storing enums as ints in JSON instead of strings ...
BulkInsertOrUpdate method can be used when there is need for both operations but in one connection to database. It makes Update when PK(PrimaryKey) is matched, otherwise does Insert.BulkInsertOrUpdateOrDelete effectively synchronizes table rows with input data. Those in Db that are not found...
For many-to-many relationships, EF Core nowimplicitly uses the partition key on the join type. You are able toconfigure time-to-live (TTL)for documents at the instance, type, and collection levels. You canconfigure container facetssuch as throughput, size, etc. through EF Core APIs. ...
Blazor EF Core Multitenant Examples of using multi-tenancy with Entity Framework Core in a Blazor app using the data context factory. Read the related, detailed blog post here. Quickstart Clone the repository: git clone https://github.com/JeremyLikness/BlazorEFCoreMultitenant Launch the app Ope...
If the association between two entity types is a primary key-to-primary key relationship, then a loaded dependent object is deleted when the principal object on the other end of the association is deleted regardless of the OnDelete specification. ...