declare @data xml
set @data = (select * from openrowset(bulk 'c:\path\data.xml', single_blob) as x)

  for $p in doc("data.xml")/people/person
 where $p/age > 30
 return $p/name/givenName/text()

 SELECT @data.query('
 for $p in /people/person
 where $p/age > 30
 return $p/name/givenName/text()
 ')

 SELECT @data.value('/people/person/age', 'int')

 XQuery [value()]: 'value()' requires a singleton (or empty sequence), found operand of type 'xdt:untypedAtomic *'

 SELECT @data.value('(/people/person/age)[1]', 'int')

 Infer.exe people.xml -o schema.xsd

<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="people">
    <xs:complexType>
      <xs:sequence>
        <xs:element maxOccurs="unbounded" name="person">
          <xs:complexType>
            <xs:sequence>
              <xs:element name="name">
                <xs:complexType>
                  <xs:sequence>
                    <xs:element name="givenName" type="xs:string" />
                    <xs:element name="familyName" type="xs:string" />
                  </xs:sequence>
                </xs:complexType>
              </xs:element>
              <xs:element name="age" type="xs:unsignedByte" />
              <xs:element name="height" type="xs:string" />
            </xs:sequence>
          </xs:complexType>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>

 declare @schema xml
set @schema = (select * from openrowset(bulk 'c:\path\schema_1.xsd', single_blob) as x)

 CREATE XML SCHEMA COLLECTION poeple_xsd AS @schema

 DECLARE @data XML(poeple_xsd)
SET @data = 'مانند قبل با همان محتوایی که در ابتدای بحث عنوان شد'
 

 SELECT @data.value('/people/person[1]/age', 'int')

 XQuery [value()]: 'value()' requires a singleton (or empty sequence), found operand of type 'xs:unsignedByte *'

 DECLARE @data XML(document poeple_xsd)

 DECLARE @x XML
SET @x=''
SELECT @x.query(
'
1,2
(: 1,2 :)
')

 DECLARE @x XML
SET @x=''
SELECT @x.query(
'
for $x in (1,2,3)
for $y in (4,5)
return ($x,$y)
')

 DECLARE @x XML
SET @x=''
SELECT @x.query(
'
1, <node/>
')

 XQuery [query()]: Heterogeneous sequences are not allowed: found 'xs:integer' and 'element(node,xdt:untyped)'

node -v

md \projects\node-edge-test1
cd \projects\node-edge-test1

npm install edge
npm install edge-sql

var edge = require('edge');

// The text in edge.func() is C# code
var helloWorld = edge.func('async (input) => { return input.ToString(); }');

helloWorld('Hello World!', function (error, result) {
    if (error) throw error;
    console.log(result);
});

node server.js

IF EXISTS(SELECT 1 FROM sys.tables WHERE object_id = OBJECT_ID('SampleUsers')) BEGIN; DROP TABLE SampleUsers; END; GO

CREATE TABLE SampleUsers ( Id INTEGER NOT NULL IDENTITY(1, 1), FirstName VARCHAR(255) NOT NULL, LastName VARCHAR(255) NOT NULL, Email VARCHAR(255) NOT NULL, CreateDate DATETIME NOT NULL DEFAULT(getdate()), PRIMARY KEY (Id) ); GO

INSERT INTO SampleUsers(FirstName,LastName,Email,CreateDate) VALUES('Orla','Sweeney','nunc@convallisincursus.ca','Apr 13, 2014');
INSERT INTO SampleUsers(FirstName,LastName,Email,CreateDate) VALUES('Zia','Pickett','porttitor.tellus.non@Duis.com','Aug 31, 2014');
INSERT INTO SampleUsers(FirstName,LastName,Email,CreateDate) VALUES('Justina','Ayala','neque.tellus.imperdiet@temporestac.com','Jul 28, 2014');
INSERT INTO SampleUsers(FirstName,LastName,Email,CreateDate) VALUES('Levi','Parrish','adipiscing.elit@velarcueu.com','Jun 21, 2014');
INSERT INTO SampleUsers(FirstName,LastName,Email,CreateDate) VALUES('Pearl','Warren','In@dignissimpharetra.org','Mar 3, 2014');

set EDGE_SQL_CONNECTION_STRING=Data Source=localhost;Initial Catalog=node-test;Integrated Security=True

SETX EDGE_SQL_CONNECTION_STRING "Data Source=localhost;Initial Catalog=node-test;Integrated Security=True"

var http = require('http');
var edge = require('edge');
var port = process.env.PORT || 8080;

var getTopUsers = edge.func('sql', function () {/*
    SELECT TOP 3 * FROM SampleUsers ORDER BY CreateDate DESC
*/});

function logError(err, res) {
    res.writeHead(200, { 'Content-Type': 'text/plain' });
    res.write("Error: " + err);
    res.end("");
}    

http.createServer(function (req, res) {
    res.writeHead(200, { 'Content-Type': 'text/html' });

    getTopUsers(null, function (error, result) {
        if (error) { logError(error, res); return; }
        if (result) {
            res.write("<ul>");
            result.forEach(function(user) {
                res.write("<li>" + user.FirstName + " " + user.LastName + ": " + user.Email + "</li>");
            });
            res.end("</ul>");
        }
        else {
        }
    });
}).listen(port);
console.log("Node server listening on port " + port);

node server-sql-query.js

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Threading.Tasks;

namespace EdgeSampleLibrary
{
     public class Sample1
    {
        public async Task<object> Invoke(object input)
        {
            // Edge marshalls data to .NET using an IDictionary<string, object>
            var payload = (IDictionary<string, object>) input;
            var pageNumber = (int) payload["pageNumber"];
            var pageSize = (int) payload["pageSize"];
            return await QueryUsers(pageNumber, pageSize);
        }

        public async Task<List<SampleUser>> QueryUsers(int pageNumber, int pageSize)
        {
            // Use the same connection string env variable
            var connectionString = Environment.GetEnvironmentVariable("EDGE_SQL_CONNECTION_STRING");
            if (connectionString == null)
                throw new ArgumentException("You must set the EDGE_SQL_CONNECTION_STRING environment variable.");

            // Paging the result set using a common table expression (CTE).
            // You may rather do this in a stored procedure or use an 
            // ORM that supports async.
            var sql = @"
DECLARE @RowStart int, @RowEnd int;
SET @RowStart = (@PageNumber - 1) * @PageSize + 1;
SET @RowEnd = @PageNumber * @PageSize;

WITH Paging AS
(
    SELECT  ROW_NUMBER() OVER (ORDER BY CreateDate DESC) AS RowNum,
            Id, FirstName, LastName, Email, CreateDate
    FROM    SampleUsers
)
SELECT  Id, FirstName, LastName, Email, CreateDate
FROM    Paging
WHERE   RowNum BETWEEN @RowStart AND @RowEnd
ORDER BY RowNum;
";
            var users = new List<SampleUser>();

            using (var cnx = new SqlConnection(connectionString))
            {
                using (var cmd = new SqlCommand(sql, cnx))
                {
                    await cnx.OpenAsync();

                    cmd.Parameters.Add(new SqlParameter("@PageNumber", SqlDbType.Int) { Value = pageNumber });
                    cmd.Parameters.Add(new SqlParameter("@PageSize", SqlDbType.Int) { Value = pageSize });

                    using (var reader = await cmd.ExecuteReaderAsync(CommandBehavior.CloseConnection))
                    {
                        while (await reader.ReadAsync())
                        {
                            var user = new SampleUser
                            {
                                Id = reader.GetInt32(0), 
                                FirstName = reader.GetString(1), 
                                LastName = reader.GetString(2), 
                                Email = reader.GetString(3), 
                                CreateDate = reader.GetDateTime(4)
                            };
                           users.Add(user);
                        }
                    }
                }
            }
            return users;
        } 
    }

    public class SampleUser
    {
        public int Id { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string Email { get; set; }
        public DateTime CreateDate { get; set; }
    }
}

[project]/bin/Debug/EdgeSampleLibrary.dll

var http = require('http');
var edge = require('edge');
var port = process.env.PORT || 8080;

// Set up the assembly to call from Node.js 
var querySample = edge.func({ assemblyFile: 'EdgeSampleLibrary.dll', typeName: 'EdgeSampleLibrary.Sample1', methodName: 'Invoke' });

function logError(err, res) { res.writeHead(200, { 'Content-Type': 'text/plain' }); res.write("Got error: " + err); res.end(""); }

http.createServer(function (req, res) { res.writeHead(200, { 'Content-Type': 'text/html' });

    // This is the data we will pass to .NET
    var data = { pageNumber: 1, pageSize: 3 };

    // Invoke the .NET function
    querySample(data, function (error, result) {
        if (error) { logError(error, res); return; }
        if (result) {
            res.write("<ul>");
            result.forEach(function(user) {
                res.write("<li>" + user.FirstName + " " + user.LastName + ": " + user.Email + "</li>");
            });
            res.end("</ul>");
        }
        else {
            res.end("No results");
        }
    });

}).listen(port);

console.log("Node server listening on port " + port);

node server-dotnet-query.js

namespace MinimalBlog.Domain.Model;

public class Author
{
    public int Id { get; set; }
    public string FirstName { get; set; } = default!;
    public string LastName { get; set; } = default!;

    public string FullName => FirstName + " " + LastName;
    public DateTime DateOfBirth { get; set; }
    public string? Bio { get; set; }
}

namespace MinimalBlog.Domain.Model;

public class Article
{
    public Article()
    {
        Categories = new List<Category>();
    }

    public int Id { get; set; }
    public string Title { get; set; } = default!;
    public string? Subtitle { get; set; }
    public string Body { get; set; } = default!;

    public int AuthorId { get; set; }
    public Author Author { get; set; } = default!;
    public DateTime DateCreated { get; set; }
    public DateTime LastUpdated { get; set; }
    public int NumberOfLikes { get; set; }
    public int NumberOfShares { get; set; }
    public ICollection<Category> Categories { get; set; }
}

namespace MinimalBlog.Domain.Model;

public class Blog
{
    public Blog()
    {
        Contributors = new List<Author>();
    }

    public int Id { get; set; }
    public string Name { get; set; } = default!;
    public string Description { get; set; } = default!;
    public DateTime CreatedDate { get; set; }

    public int AuthorId { get; set; }
    public Author Owner { get; set; } = default!;

    public ICollection<Author> Contributors { get; }
}

namespace MinimalBlog.Domain.Model;

public class Category
{
    public Category()
    {
        Articles = new List<Article>();
    }

    public int Id { get; set; }
    public string Name { get; set; } = default!;
    public string Description { get; set; } = default!;
    public ICollection<Article> Articles { get; set; }
}

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>
  <ItemGroup>
    <ProjectReference Include="..\MinimalBlog.Domain\MinimalBlog.Domain.csproj" />
  </ItemGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="6.0.2" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="6.0.2" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="6.0.2">
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </PackageReference>
  </ItemGroup>
</Project>

using Microsoft.EntityFrameworkCore;
using MinimalBlog.Domain.Model;

namespace MinimalBlog.Dal;

public class MinimalBlogDbContext : DbContext
{
    public MinimalBlogDbContext(DbContextOptions options) : base(options)
    {
    }

    public DbSet<Article> Articles { get; set; } = default!;
    public DbSet<Category> Categories { get; set; } = default!;
    public DbSet<Author> Authors { get; set; } = default!;
    public DbSet<Blog> Blogs { get; set; } = default!;
}

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "AllowedHosts": "*",
  "ConnectionStrings": {
    "Default": "Data Source=(localdb)\\MSSQLLocalDB;Initial Catalog=MinimalBlog;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False"
  }
}

<Project Sdk="Microsoft.NET.Sdk.Web">
  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
    <Nullable>enable</Nullable>
    <ImplicitUsings>enable</ImplicitUsings>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.2.3" />
    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="6.0.2" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="6.0.2" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="6.0.2">
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </PackageReference>
  </ItemGroup>
  <ItemGroup>
    <ProjectReference Include="..\MinimalBlog.Domain\MinimalBlog.Domain.csproj" />
    <ProjectReference Include="..\MinimalBlog.Dal\MinimalBlog.Dal.csproj" />
  </ItemGroup>
</Project>

using Microsoft.EntityFrameworkCore;
using MinimalBlog.Dal;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var connectionString = builder.Configuration.GetConnectionString("Default");
builder.Services.AddDbContext<MinimalBlogDbContext>(opt => opt.UseSqlServer(connectionString));

For /f "tokens=2-4 delims=/ " %%a in ('date /t') do (set mydate=%%c_%%a_%%b)
For /f "tokens=1-2 delims=/:" %%a in ("%TIME: =0%") do (set mytime=%%a%%b)
dotnet tool update --global dotnet-ef --version 6.0.2
dotnet build
dotnet ef migrations --startup-project ../MinimalBlog.Api/ add V%mydate%_%mytime% --context MinimalBlogDbContext
pause

[*.cs]
generated_code = true

dotnet tool update --global dotnet-ef --version 6.0.2
dotnet build
dotnet ef --startup-project ../MinimalBlog.Api/ database update --context MinimalBlogDbContext
pause

//dynamic reflection
PropertyInfo property = typeof (MyClass).GetProperty("Name");
MethodInfo method = typeof (MyClass).GetMethod("SomeMethod");

public string TextBoxFor<T>(Expression<Func<T,object>> expression);

<%= this.TextBoxFor(model => model.FirstName); %>

public PropertyInfo GetProperty<T>(Expression<Func<T, object>> expression)
{
 var memberExpression = expression.Body as MemberExpression;

 if (memberExpression == null)
     throw new InvalidOperationException("Not a member access.");

  return memberExpression.Member as PropertyInfo;
}

public class AddressMap : DomainMap<Address>
{
 public AddressMap()
 {
    Map(a => a.Address1);
 }
}

• Expression Tree Basics

• Functional Programming for Everyday .NET Development

• Introduction to static reflection

• The basics behind static reflection

• Dynamic reflection versus static reflection

• Static Reflection of property names

• Lisp is sin

Changes to Nullable Reference Type Annotations in .NET 6.0