CheckConstraintConvention 建構函式 參考 意見反應 定義 命名空間: Microsoft.EntityFrameworkCore.Metadata.Conventions 組件: Microsoft.EntityFrameworkCore.Relational.dll 套件: Microsoft.EntityFrameworkCore.Relational v8.0.0 建立CheckConstraintConvention 的新執行個體。 C# 複製 public Chec...
Ensamblado: Microsoft.EntityFrameworkCore.Relational.dll Paquete: Microsoft.EntityFrameworkCore.Relational v8.0.0 Representa una restricción check en el tipo de entidad. C# Copiar public interface ICheckConstraint : Microsoft.EntityFrameworkCore.Infrastructure.IAnnotatable, Microsoft.EntityFrameworkCore...
FindCheckConstraint (this Microsoft.EntityFrameworkCore.Metadata.IEntityType entityType, string name); 参数 entityType IEntityType 要查找其检查约束的实体类型。 name String 检查约束名称。 返回 ICheckConstraint 如果在ICheckConstraint给定实体类型中找不到具有给定名称的 或 null 检查约束。 适用...
命名空间: Microsoft.EntityFrameworkCore.Metadata 程序集: Microsoft.EntityFrameworkCore.Relational.dll 包: Microsoft.EntityFrameworkCore.Relational v9.0.0 Source: IReadOnlyCheckConstraint.cs 获取定义此检查约束的实体类型。 C# 复制 public Microsoft.EntityFrameworkCore.Metadata.IReadOnlyEntityTyp...
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...
ALTERTABLE [dbo].[Employee] CHECKCONSTRAINT [FK_Employee_Department] GO 2 Entity Framework Core数据库连接字符串 数据库连接字符串包含了数据源以及一些必要的连接信息,EF Core需要连接字符串和数据库进行交互,指定数据库操作像新增,读取等,打开SQL Sever Object Explorer,鼠标选中数据库,右击属性,在属性窗体中找...
本文主要介绍在ADO.NET Entity Framework中使用存储过程来进行查询、插入、更新、删除操作。 使用一下SQL建立实例数据库,下面选择了Northwind库来执行 SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE TABLE[dbo].[Group]([GroupID] [int]IDENTITY(1,1) NOT NULL,[GroupName] [nvarchar](20) NOT NU...
CONSTRAINT [PK_School.Student] PRIMARY KEY CLUSTERED ( [PersonID] ASC ) ON [PRIMARY] ) ON [PRIMARY] END GO -- Create the Enrollment table. IF NOT EXISTS (SELECT * FROM dbo.sysobjects WHERE id = OBJECT_ID(N'[dbo].[Enrollment]') AND OBJECTPROPERTY(id, N'IsUserTable') = 1) ...
I have a unique key constraint in my SQL Server that is based on two columns (AbsoluteCounter, TimeMfrAudit). If I try to add a list of objects via Entity Framework, how can I check if one of my objects is going to violate this constraint without throwing an exception that will make...
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...