Check constraints for Entity Framework Core Many databases support something called "check constraints", which allow you to define arbitrary validation for the rows of a table. Think about it like a boring column unique constraint, but on steroids - you can specify that every customer in your ta...
A convention that ensures that the check constraints on the derived types are compatible with the check constraints on the base type. And also ensures that the declaring type is current.C# Kopēt public class CheckConstraintConvention : Microsoft.EntityFrameworkCore.Metadata.Conventions.IEnti...
組件: Microsoft.EntityFrameworkCore.Relational.dll 套件: Microsoft.EntityFrameworkCore.Relational v9.0.0 來源: MigrationsSqlGenerator.cs 為 的檢查條件約束 CreateTableOperation 產生SQL 片段。 C# 複製 protected virtual void CreateTableCheckConstraints(Microsoft.EntityFrameworkCore...
Microsoft.EntityFrameworkCore.Relational.dll Package: Microsoft.EntityFrameworkCore.Relational v9.0.0 Overloads Extindeți tabelul GetDeclaredCheckConstraints(IConventionEntityType) Returns all check constraints declared on the entity type. GetDeclaredCheckConstraints(IEntityType) ...
The Entity Framework has certain rules that it follows when it checks relationship constraints, performs inserts, etc. When there's no foreign key property to keep track of a required principal (e.g., knowing what the destination is for a particular lodging), it's up to the developer to ...
Microsoft.EntityFrameworkCore.ChangeTracking Microsoft.EntityFrameworkCore.Cosmos.Extensions Microsoft.EntityFrameworkCore.Design Microsoft.EntityFrameworkCore.Diagnostics Microsoft.EntityFrameworkCore.Infrastructure Microsoft.EntityFrameworkCore.InMemory.Metadata.Conventions ...
An Entity Framework Core plugin to automatically add check constraints in various situations - roji/EFCore.CheckConstraints
EF Core 5.0 Migrations can now generate CHECK constraints for enum property mappings. For example: Copy EnumColumnVARCHAR(10)NOTNULLCHECK(MyEnumColumnIN('Useful','Useless','Unknown')) IsRelational A newIsRelationalmethod has been added in addition to the existingIsSqlServer,IsSqlite, andIsInMemory...
为了避免这个异常,可以使用TryGetObjectStateEntry。它和GetObjectStateEntry执行相同的任务;但是遵循了.NET Framework的设计指南,这个方法接收一个实体和一个表示entry找到的输出参数,它返回一个布尔值指定entry是否找到。如果返回false,输出参数为null。看下面的清单: ...
The Entity Framework has certain rules that it follows when it checks relationship constraints, performs inserts, etc. When there’s no foreign key property to keep track of a required principal (e.g., knowing what the destination is for a particular lodging), it’s up to the developer to...