CSharp: Add,Edit,Del,Select in donet using Entity Framework

 sql:

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--dbo.BillingDetails
--BillingDetailId int identity
--Owner
--Number
--BankName
--Swift
--CardType int
--ExpiryMonth
--ExpiryYear
--Discriminator
 
IF EXISTS (select * from sysobjects where id = object_id(N'[dbo].BillingDetails') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
DROP TABLE BillingDetails
GO
create table BillingDetails
(
     BillingDetailId INT IDENTITY(1,1) PRIMARY KEY,
     [Owner] nvarchar(50) not  null,
     Number nvarchar(50)  null,
    --BankName nvarchar(50)  null,
    --Swift nvarchar(50)  null,
    --CardType int null,
    --ExpiryMonth nvarchar(50)  null,
    --ExpiryYear nvarchar(50)  null,
    Discriminator  nvarchar(50)  null
)
go
 
 
--BankAccount BankName  Swift
IF EXISTS (select * from sysobjects where id = object_id(N'[dbo].BankAccount') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
DROP TABLE BankAccount
GO
create table BankAccount
(
     Id INT IDENTITY(1,1) PRIMARY KEY,
     BankName   nvarchar(50)  null,
     Swift nvarchar(50)  null
)
go
 
 
 
--CreditCard  CardType ExpiryMonth  ExpiryYear
IF EXISTS (select * from sysobjects where id = object_id(N'[dbo].CreditCard') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
DROP TABLE CreditCard
GO
create table CreditCard
(
     Id INT IDENTITY(1,1) PRIMARY KEY,
     CardType  nvarchar(50)  null,
     ExpiryMonth  nvarchar(50)  null,
     ExpiryYear  nvarchar(50)  null
 
)
go
 
 
 
--dbo.Categories 
--CategoryId int
--CategoryName 50
IF EXISTS (select * from sysobjects where id = object_id(N'[dbo].Categories') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
DROP TABLE Categories
GO
create table Categories
(
     CategoryId INT IDENTITY(1,1) PRIMARY KEY,
     CategoryName nvarchar(50) not null
)
go
 
 
 
--dbo.Products
--ProductId int identity
--ProductName 50
--CategoryId int  dbo.Categories CategoryId
IF EXISTS (select * from sysobjects where id = object_id(N'[dbo].Products') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
DROP TABLE Products
GO
create table Products
(
    ProductId INT IDENTITY(1,1) PRIMARY KEY,
    ProductName nvarchar(50) not null,
    CategoryId int
        FOREIGN KEY REFERENCES Categories(CategoryId)
 
)
go
 
 
--dbo.Customers
--Id int identity
--Name 50
--Email  20
--CreatedTime date
--ModifiedTime date
IF EXISTS (select * from sysobjects where id = object_id(N'[dbo].Customers') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
DROP TABLE Customers
GO
create table Customers
(
    Id INT IDENTITY(1,1) PRIMARY KEY,
    [Name] nvarchar(50) not null,
    Email nvarchar(20) null,
    CreatedTime date null,
    ModifiedTime date null
)
go
 
insert into Customers([Name],Email,CreatedTime,ModifiedTime) values('geovindu','geovindu@163.com' ,getdate(),getdate())
go
 
insert into Customers([Name],Email,CreatedTime,ModifiedTime) values('test','geovindu@163.com' ,getdate(),getdate())
go
 
insert into Customers([Name],Email,CreatedTime,ModifiedTime) values('江城','geovindu@163.com' ,getdate(),getdate())
go
 
insert into Customers([Name],Email,CreatedTime,ModifiedTime) values('保中','geovindu@163.com' ,getdate(),getdate())
go
 
insert into Customers([Name],Email,CreatedTime,ModifiedTime) values('王二','geovindu@163.com' ,getdate(),getdate())
go
 
insert into Customers([Name],Email,CreatedTime,ModifiedTime) values('李三','geovindu@163.com' ,getdate(),getdate())
go
 
 
insert into Customers([Name],Email,CreatedTime,ModifiedTime) values('张四','geovindu@163.com' ,getdate(),getdate())
go
 
 
insert into Customers([Name],Email,CreatedTime,ModifiedTime) values('赵五','geovindu@163.com' ,getdate(),getdate())
go
 
 
insert into Customers([Name],Email,CreatedTime,ModifiedTime) values('陈六','geovindu@163.com' ,getdate(),getdate())
go
 
 
 
insert into Customers([Name],Email,CreatedTime,ModifiedTime) values('刘七','geovindu@163.com' ,getdate(),getdate())
go
 
 
 
insert into Customers([Name],Email,CreatedTime,ModifiedTime) values('徐八','geovindu@163.com' ,getdate(),getdate())
go
 
insert into Customers([Name],Email,CreatedTime,ModifiedTime) values('何九','geovindu@163.com' ,getdate(),getdate())
go
 
select * from Customers
go
 
 
 
--dbo.Orders
--Id int identity
--Quantity int
-- Code 400
--Price Decimal 18,4
--CustomerId int dbo.Customers CustomerId
--CreatedTime
--ModifiedTime
 
IF EXISTS (select * from sysobjects where id = object_id(N'[dbo].Orders') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
DROP TABLE Orders
GO
create table Orders
(
    Id INT IDENTITY(1,1) PRIMARY KEY,
    Quantity int null,
    Code nvarchar(400) null,
    Price decimal(18,4) null,
    CustomerId int
        FOREIGN KEY REFERENCES Customers(Id),
    CreatedTime date null,
    ModifiedTime date null
)
go
 
insert into Orders(Quantity,Code,Price,CustomerId,CreatedTime,ModifiedTime) values(10,N'4008',250.00,1,getdate(),getdate())
go
 
select * from Orders
go
 
 
 
--dbo.Students
--Id int identity
--Name
--Age byte
--CreatedTime date
-- ModifiedTime date
IF EXISTS (select * from sysobjects where id = object_id(N'[dbo].Students') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
DROP TABLE Students
GO
create table Students
(
    Id INT IDENTITY(1,1) PRIMARY KEY,
    [Name] nvarchar(50) not null,
    Age tinyint  null,
    CreatedTime date null,
    ModifiedTime date null
)
go
 
insert into Students([Name],Age,CreatedTime,ModifiedTime) values('sibodu',12,getdate(),getdate())
go
 
select * from Students
go
 
--StudentContact  ContactNumber
 
IF EXISTS (select * from sysobjects where id = object_id(N'[dbo].StudentContact') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
DROP TABLE StudentContact
GO
create table StudentContact
(
    Id INT IDENTITY(1,1) PRIMARY KEY,
    StudentId int
       FOREIGN KEY REFERENCES Students(Id),
    ContactNumber nvarchar(50) null
)
go
 
 
 
 
 
 
 
 
 
 
 
-- dbo.Courses
--Id  int identity
--Name
--MaximumStrength int
--CreatedTime
--ModifiedTime
--
IF EXISTS (select * from sysobjects where id = object_id(N'[dbo].Courses') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
DROP TABLE Courses
GO
create table Courses
(
    Id INT IDENTITY(1,1) PRIMARY KEY,
    [Name] nvarchar(50) not null,
    MaximumStrength int null,
    CreatedTime date null,
    ModifiedTime date null
)
go
 
insert into Courses([Name],MaximumStrength,CreatedTime,ModifiedTime) values('语文',25,getdate(),getdate())
go
 
 
select * from Courses
go
 
 
 
-- DropForeignKey("dbo.Orders", "CustomerId", "dbo.Customers");
-- DropForeignKey("dbo.Products", "CategoryId", "dbo.Categories");

　　

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using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Runtime.Remoting.Contexts;
using System.Text;
using System.Threading.Tasks;
using DuEntity;
using DuInterface;
using DuUtilitieDB;
 
namespace DuDAL
{
 
    /// <summary>
    /// geovindu,Geovin Du 涂聚文 sql server
    /// EntityFramework 6.0
    /// </summary>
    public class CategoryDAL: ICategory
    {
 
        /// <summary>
        /// 添加
        /// </summary>
        /// <param name="category"></param>
        /// <returns></returns>
        public int Add(Category category)
        {
            int addok = 0;
 
            try
            {
                using (var context = new DuDbContext())
                {
                    //context.Database.ExecuteSqlCommand("");
                    context.Categories.Add(category);
                    addok = context.SaveChanges();
                }
            }
            catch (Exception ex)
            {
                ex.Message.ToString();
            }
            return addok;
        }
 
        /// <summary>
        /// 修改
        /// </summary>
        /// <param name="category"></param>
        /// <returns></returns>
        public int Update(Category category)
        {
            int edidok = 0;
            try
            {
                using (var context = new DuDbContext())
                {
                    // edidok = ctx.Database.ExecuteSqlCommand("");                
                    context.Entry(category).State = category.CategoryId == 0 ? EntityState.Added : EntityState.Modified;
                    edidok = context.SaveChanges();
                }
            }
            catch (Exception ex)
            {
                ex.Message.ToString();
            }
 
            return edidok;
        }
        /// <summary>
        /// 删除
        /// </summary>
        /// <param name="categoryId"></param>
        /// <returns></returns>
        public int Delte(int categoryId)
        {
            int delok = 0;
            try
            {
                using (var context = new DuDbContext())
                {
                    // delok = ctx.Database.ExecuteSqlCommand("");                  
                   var dellist=context.Categories.Where(c => c.CategoryId == categoryId).ToList();
                    if(dellist.Count > 0)
                    {
                        context.Categories.RemoveRange(dellist);
                        delok = context.SaveChanges();
                        // context.Categories.Where(x => x.CategoryId == categoryId).DefaultIfEmpty();
                        //context.Categories.Where(x => x.CategoryId == categoryId).DeleteFromQuery();
 
                    }
 
                }
            }
            catch (Exception ex)
            {
                ex.Message.ToString();
            }
 
            return delok;
        }
        /// <summary>
        /// 查找一个实例
        /// </summary>
        /// <param name="categoryId"></param>
        /// <returns></returns>
        public Category SelectInfo(int categoryId)
        {          
 
            Category category= null;   
            try
            {
                using (var context = new DuDbContext())
                {
                    // delok = ctx.Database.ExecuteSqlCommand("");                  
                    //category = context.Categories.Where(c => c.CategoryId == categoryId);            
                    category = context.Categories.FindAsync(categoryId).Result;
                }
            }
            catch (Exception ex)
            {
                ex.Message.ToString();
            }
 
            return category;
        }
 
    }
}

 

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using (var ctx = new EfDbContext())
            {
                ctx.Database.Log = Console.WriteLine;
 
                // var customers = ctx.Customers;
 
                //var customer = customers.FirstOrDefault(d => d.Id == 1); // customers.FindAsync(1).Result;
                //Console.WriteLine(customer.Name);
 
                //bool contains = customers.Where(c => c.Name == "geovindu").Contains(customer);
 
 
                //添加
                //var addcustomer = new Customer()
                //{
                //    Name = "涂聚文",
                //    Email = "463588883@qq.com",
                //    CreatedTime = DateTime.Now,
                //    ModifiedTime = DateTime.Now
                //};
                //ctx.Customers.Add(addcustomer);
                //int k=ctx.SaveChanges();
 
 
                //修改
                // var editcustomer = new Customer()
                // {
                //   Id =1,
                //   Name="涂年生",
                //   Email="463588883@qq.com",
                //   CreatedTime=DateTime.Now,
                //   ModifiedTime=DateTime.Now
 
                // };
                // ctx.Entry(editcustomer).State=System.Data.Entity.EntityState.Modified;
                //int k=ctx.SaveChanges();
                // if (k > 0)
                //     Console.WriteLine("ok,eidt");
 
                //删除
                //var delcustomer = new Customer()
                //{
                //    Id= 3
                //};
 
                //ctx.Entry(delcustomer).State = System.Data.Entity.EntityState.Deleted;
                //int k = ctx.SaveChanges();
                //if (k > 0)
                //    Console.WriteLine("ok del");
 
 
                //查询集合
                var customers = ctx.Customers;
 
                //var names = customers
                //    .Select(x => x.Name)
                //    //.Take(10)
                //    .OrderBy(d=>1)
                //    .Skip(5)                   
                //    .ToList();
 
                var names = customers
                    .Select(x => x.Name)
                    .Take(10)
                    .OrderBy(d => 1)
                    //.Skip(5)
                    .ToList();
 
                foreach (var name in names)
                {
                    Console.WriteLine(name+"\n\t");
                }
 
                //原始查询
                var cus = ctx.Database.SqlQuery<Customer>("SELECT * FROM dbo.Customers").ToList();
 
                foreach (var cs in cus)
                {
                    Console.WriteLine("name:"+cs.Name + "\n\t");
                }
 
                var id = 1;
                var par = new SqlParameter[]
                    {
                        new SqlParameter(){ ParameterName="@id",SqlDbType=SqlDbType.Int,Value=id },
                    };
                var cust = ctx.Database.SqlQuery<Customer>("SELECT * FROM dbo.Customers where id=@id", par).ToList();
 
 
 
 
            }
            Console.ReadKey();

　实体添加，修改，删除

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//添加
var addcustomer = new Customer()
{
    Name = "涂聚文",
    Email = "463588883@qq.com",
    CreatedTime = DateTime.Now,
    ModifiedTime = DateTime.Now
};
ctx.Customers.Add(addcustomer);
ctx.Entry(addcustomer).State = System.Data.Entity.EntityState.Added;
int k = ctx.SaveChanges();
 
 
//修改
 var editcustomer = new Customer()
 {
     Id = 1,
     Name = "涂年生",
     Email = "463588883@qq.com",
     CreatedTime = DateTime.Now,
     ModifiedTime = DateTime.Now
 
 };
ctx.Entry(editcustomer).State = System.Data.Entity.EntityState.Modified;
 k = ctx.SaveChanges();
if (k > 0)
    Console.WriteLine("ok,eidt");
 
//删除
var delcustomer = new Customer()
{
    Id = 14
};
 
ctx.Entry(delcustomer).State = System.Data.Entity.EntityState.Deleted;
 k = ctx.SaveChanges();
if (k > 0)
    Console.WriteLine("ok del");

　　

 

开发环境(Development)
演示（模拟、临时）环境(Staging)
生产环境(Production)
测试环境(Testing)
预发布环境(UAT)
正式环境(Production)

data structures and algorithms
https://github.com/PacktPublishing/C-Sharp-Data-Structures-and-Algorithms
https://github.com/aalhour/C-Sharp-Algorithms
https://github.com/abdonkov/DSA
https://github.com/scottfalbo/data-structures-and-algorithms
https://github.com/anirban-s/data-structures-and-algorithms
https://github.com/akgmage/data-structures-and-algorithms
Collection of well known Data Structures, and Algorithms in Go, C++, Java & Python
https://github.com/phishman3579/java-algorithms-implementation
https://github.com/thepranaygupta/Data-Structures-and-Algorithms
https://kentdlee.github.io/CS2Plus/build/html/index.html
https://github.com/kentdlee/CS2Plus
https://github.com/YanxinHuang/data-structure-and-algorithm
https://www.codeproject.com/articles/16337/back-to-basics-generic-data-structures-and-algorit
https://github.com/krahets/hello-algo
《Hello 算法》一本动画图解、能运行、可提问的数据结构与算法入门书。提供 Java, C++, Python, Go, JS, TS, C# 源代码。
https://github.com/topics/data-structures-and-algorithms

　　

posted @   ®Geovin Du Dream Park™  阅读(42)  评论(0)  编辑  收藏  举报
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