EntityFrameworkCore.Design Microsoft.EntityFrameworkCore.Diagnostics Microsoft.EntityFrameworkCore.Infrastructure Microsoft.EntityFrameworkCore.InMemory.Metadata.Conventions Microsoft.EntityFrameworkCore.Metadata Microsoft.EntityFrameworkCore.Metadata CheckConstraintExtensions CheckConstraintExtensions 方法 ColumnExtensions ...
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 v9.0.0 來源: CheckConstraintConvention.cs ...
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...
publicvirtualMicrosoft.EntityFrameworkCore.Metadata.Builders.CheckConstraintBuilderHasCheckConstraint(stringname,string? sql); 参数 name String 检查约束的名称。 sql String 检查约束中使用的逻辑约束 sql。 返回 CheckConstraintBuilder 用于配置检查约束的生成器。
public static Microsoft.EntityFrameworkCore.Metadata.IMutableCheckConstraint AddCheckConstraint(this Microsoft.EntityFrameworkCore.Metadata.IMutableEntityType entityType, string name, string sql); Parámetros entityType IMutableEntityType Tipo de entidad al que se va a agregar la restricción c...
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...
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...
Entity Framework应用:导航属性 一、主键和外键 关系型数据库中的一条记录中有若干个属性,若其中某一个属性组是能唯一标识一条记录,该属性组就可以称为主键。例如: 学生版(学号、姓名、性别、班级) 其中每个学生的学号是唯一的,学号就是一个主键。 课程表(课程编号,课程名,学分)...
//ALTER TABLE Vehicle CHECK CONSTRAINT FK_Vehicle_Manufacture //GO staticclassProgram { staticvoidMain(string[] args) { try { do { Console.Write("Manufacture Name:"); stringmanufactureName=Console.ReadLine(); Console.Write("Vehicle Name:"); ...
In case you missed it, check out the latest EF community standup in which we share and discuss the results of the recent Entity Framework survey. The EF Core Community Standups are live-streamed about once every two weeks. This is your opportunity to interact with the EF team and others...