SQL Server 2022 : Use with C#2023/11/30

dotnet --version

dotnet new console -o MssqlTest

The template "Console App" was created successfully.

Processing post-creation actions...
Restoring /home/centos/MssqlTest/MssqlTest.csproj:
  Determining projects to restore...
  Restored /home/centos/MssqlTest/MssqlTest.csproj (in 72 ms).
Restore succeeded.

cd MssqlTest

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net6.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>
  # add
  <ItemGroup>
    <PackageReference Include="System.Data.SqlClient" Version="4.4.0" />
  </ItemGroup>
</Project>

# sample database for testing

sqlcmd -S localhost -U centos -d SampleDB3 -Q 'select * from dbo.SampleTable;'

Password:
ID          First_Name             Last_Name
----------- ---------------------- ---------------------
          1 CentOS                 Linux
          3 RedHat                 Plow
          4 Windows                Microsoft

(3 rows affected)

cd MssqlTest

using System;
using System.Text;
using System.Data.SqlClient;

namespace SqlServerSample
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                SqlConnectionStringBuilder builder = new SqlConnectionStringBuilder();
                builder.DataSource = "127.0.0.1";
                builder.UserID = "centos";
                builder.Password = "P@ssw0rd01";
                builder.InitialCatalog = "SampleDB3";

                Console.Write("Connecting to SQL Server... ");
                using (SqlConnection connection = new SqlConnection(builder.ConnectionString))
                {
                    connection.Open();
                    Console.WriteLine("Done.");
                    StringBuilder sb = new StringBuilder();

                    // Select data from SampleTable
                    Console.WriteLine("Reading data from SampleTable...");
                    String sql = "select * from SampleTable;";
                    using (SqlCommand command = new SqlCommand(sql, connection))
                    {
                        using (SqlDataReader reader = command.ExecuteReader())
                        {
                            while (reader.Read())
                            {
                                Console.WriteLine(
                                    "{0} {1} {2}", 
                                    reader.GetInt32(0),
                                    reader.GetString(1),
                                    reader.GetString(2)
                                    );
                            }
                        }
                    }
                    
                    // Insert data into SampleTable
                    Console.Write("\r\nInserting into SampleTable...\r\n");
                    sb.Clear();
                    sb.Append("insert SampleTable (First_Name, Last_Name) ");
                    sb.Append("values (@first_name, @last_name);");
                    sql = sb.ToString();
                    using (SqlCommand command = new SqlCommand(sql, connection))
                    {
                        command.Parameters.AddWithValue("@first_name", "Debian");
                        command.Parameters.AddWithValue("@last_name", "Linux");
                        int rowsAffected = command.ExecuteNonQuery();
                        Console.WriteLine(rowsAffected + " row(s) inserted");
                    }

                    // Update data in SampleTable
                    String userToUpdate = "CentOS";
                    Console.Write("\r\nUpdating 'Last_Name' for user " + userToUpdate + "\r\n");
                    sb.Clear();
                    sb.Append("update SampleTable set Last_Name = N'Stream' where First_Name = @first_name");
                    sql = sb.ToString();
                    using (SqlCommand command = new SqlCommand(sql, connection))
                    {
                        command.Parameters.AddWithValue("@first_name", userToUpdate);
                        int rowsAffected = command.ExecuteNonQuery();
                        Console.WriteLine(rowsAffected + " row(s) updated\r\n");
                    }
                    
                    sql = "select * from SampleTable;";
                    using (SqlCommand command = new SqlCommand(sql, connection))
                    {
                        using (SqlDataReader reader = command.ExecuteReader())
                        {
                            while (reader.Read())
                            {
                                Console.WriteLine(
                                    "{0} {1} {2}",
                                    reader.GetInt32(0),
                                    reader.GetString(1),
                                    reader.GetString(2)
                                    );
                            }
                        }
                    }
                    
                    // Delete data in SampleTable
                    String userToDelete = "Windows";
                    Console.Write("\r\nDeleting user '" + userToDelete + "'\r\n");
                    sb.Clear();
                    sb.Append("delete from SampleTable where First_Name = @first_name;");
                    sql = sb.ToString();
                    using (SqlCommand command = new SqlCommand(sql, connection))
                    {
                        command.Parameters.AddWithValue("@first_name", userToDelete);
                        int rowsAffected = command.ExecuteNonQuery();
                        Console.WriteLine(rowsAffected + " row(s) deleted");
                    }
                }
            }
            catch (SqlException e)
            {
                Console.WriteLine(e.ToString());
            }
        }
    }
}

dotnet restore

  Determining projects to restore...
  Restored /home/centos/MssqlTest/MssqlTest.csproj (in 4.51 sec).

dotnet run

Connecting to SQL Server... Done.
Reading data from SampleTable...
1 CentOS Linux
3 RedHat Plow
4 Windows Microsoft

Inserting into SampleTable...
1 row(s) inserted

Updating 'Last_Name' for user CentOS
1 row(s) updated

1 CentOS Stream
3 RedHat Plow
4 Windows Microsoft
5 Debian Linux

Deleting user 'Windows'
1 row(s) deleted

sqlcmd -S localhost -U centos -d SampleDB3 -Q 'select * from dbo.SampleTable;'

Password:
ID          First_Name          Last_Name
----------- ------------------- ---------------------
          1 CentOS              Stream
          3 RedHat              Plow
          5 Debian              Linux

(3 rows affected)