entityframework

PacticeSolution/EntityFrameworkSample/EntityFrameworkSample.csproj

@@ -0,0 +1,15 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="7.0.9" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="7.0.9" />
+  </ItemGroup>
+
+</Project>

PacticeSolution/EntityFrameworkSample/Program.cs

@@ -0,0 +1,58 @@
+using System.Diagnostics;
+
+namespace EntityFrameworkSample
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            using (var db = new UserDbContext())
+            {
+                Console.WriteLine("Select *");
+                var userList = db.User.ToList();
+                foreach (var user in userList)
+                {
+                    Console.WriteLine($"[{user.Id}] {user.Name} ({user.Phone}) {user.Address}");
+                }
+
+                db.User.Add(new User { Name = "Salmon", Phone = "010-1234-5678", Address = "Wild mountain" });
+                db.SaveChanges();
+
+                Console.WriteLine("Select *");
+                userList = db.User.ToList();
+                foreach (var user in userList)
+                {
+                    Console.WriteLine($"[{user.Id}] {user.Name} ({user.Phone}) {user.Address}");
+                }
+
+                var selected = db.User.Where(u => u.Name == "Torr").FirstOrDefault();
+                if (selected != null)
+                {
+                    selected.Address = "Asgard";
+                    db.SaveChanges();
+                }
+
+                Console.WriteLine("Select *");
+                userList = db.User.ToList();
+                foreach (var user in userList)
+                {
+                    Console.WriteLine($"[{user.Id}] {user.Name} ({user.Phone}) {user.Address}");
+                }
+
+                selected = db.User.Where(u => u.Name == "Salmon").FirstOrDefault();
+                if (selected != null)
+                {
+                    db.User.Remove(selected);
+                    db.SaveChanges();
+                }
+
+                Console.WriteLine("Select *");
+                userList = db.User.ToList();
+                foreach (var user in userList)
+                {
+                    Console.WriteLine($"[{user.Id}] {user.Name} ({user.Phone}) {user.Address}");
+                }
+            }
+        }
+    }
+}

PacticeSolution/EntityFrameworkSample/User.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace EntityFrameworkSample
+{
+    internal class User
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+        public string Phone { get; set; }
+        public string Address { get; set; }
+    }
+}

PacticeSolution/EntityFrameworkSample/UserDbContext.cs

@@ -0,0 +1,20 @@
+using Microsoft.EntityFrameworkCore;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace EntityFrameworkSample
+{
+    internal class UserDbContext : DbContext
+    {
+        public DbSet<User> User { get; set; }
+
+        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+        {
+            string connectionString = @"Data Source=peacecloud.synology.me,21433;Initial Catalog=Study;User ID=study;Password=Study1234;Encrypt=false;";
+            optionsBuilder.UseSqlServer(connectionString);
+        }
+    }
+}

PacticeSolution/LinqInNotIn/Program.cs

@@ -34,6 +34,7 @@
                 Console.WriteLine($"idx: {item.ProductId}, name: {item.Name}");
             }
 
+            Console.WriteLine("first, single");
             var firstItem = products.First(item => item.ProductId == 3);
             var singleItem = products.Single(item => item.ProductId == 3);
             Console.WriteLine($"first == single: {firstItem == singleItem}");

PacticeSolution/PacticeSolution.sln

@@ -123,6 +123,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CommandSample", "CommandSam
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "LinqInNotIn", "LinqInNotIn\LinqInNotIn.csproj", "{9261D8E1-5DEE-4329-AB32-946AD5E69C66}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "EntityFrameworkSample", "EntityFrameworkSample\EntityFrameworkSample.csproj", "{AAEF47BF-A410-4A4D-942B-D9A1F4AA1343}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -369,6 +371,10 @@ Global
 		{9261D8E1-5DEE-4329-AB32-946AD5E69C66}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{9261D8E1-5DEE-4329-AB32-946AD5E69C66}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{9261D8E1-5DEE-4329-AB32-946AD5E69C66}.Release|Any CPU.Build.0 = Release|Any CPU
+		{AAEF47BF-A410-4A4D-942B-D9A1F4AA1343}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{AAEF47BF-A410-4A4D-942B-D9A1F4AA1343}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{AAEF47BF-A410-4A4D-942B-D9A1F4AA1343}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{AAEF47BF-A410-4A4D-942B-D9A1F4AA1343}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE