gistlib - make custom database system in csharp

To create a custom database system in C#, we need to follow a few steps:

Define the data structure: First, we need to define the data structure that we want to store in the database. We can create a class for each data type we want to store.


main.cs
public class Student
{
    public int Id { get; set; }
    public string Name { get; set; }
    public int Age { get; set; }
    public string Location { get; set; }
}
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Create a database class: We create a database class that contains methods for adding, updating, and retrieving data.


main.cs
public class Database
{
    private List<Student> students = new List<Student>();

    public void AddStudent(Student student)
    {
        students.Add(student);
    }

    public void UpdateStudent(Student student)
    {
        var index = students.FindIndex(s => s.Id == student.Id);
        students[index] = student;
    }

    public Student GetStudentById(int id)
    {
        return students.FirstOrDefault(s => s.Id == id);
    }

    public List<Student> GetAllStudents()
    {
        return students;
    }
}
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Create a user interface: We can create a simple user interface that allows users to interact with the database.


main.cs
static void Main(string[] args)
{
    var db = new Database();

    // Add students to the database
    db.AddStudent(new Student { Id = 1, Name = "John Doe", Age = 22, Location = "New York" });
    db.AddStudent(new Student { Id = 2, Name = "Jane Smith", Age = 21, Location = "Chicago" });

    // Update a student's information
    var student = db.GetStudentById(1);
    student.Location = "San Francisco";
    db.UpdateStudent(student);

    // Get all students from the database
    var students = db.GetAllStudents();

    // Display the students
    foreach (var s in students)
    {
        Console.WriteLine($"{s.Id} - {s.Name}, Age {s.Age}, Location {s.Location}");
    }
}
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Store data persistently: For a true database system, we would want to store the data persistently, using a file or an actual database engine such as MySQL or SQL Server. We can use SQL commands or LINQ to retrieve and manipulate the data in the database.


main.cs
// Using LINQ to get students from a SQL database
var students = from s in dbContext.Students
               where s.Age > 18
               orderby s.Name
               select s;

// Using SQL commands to update data
var command = new SqlCommand("UPDATE Students SET Location = @location WHERE Id = @id");
command.Parameters.AddWithValue("@location", "Los Angeles");
command.Parameters.AddWithValue("@id", 1);
command.ExecuteNonQuery();
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By following these steps, we can create a custom database system in C# that meets our specific needs.

make custom database system in csharp

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