winforms-sql-connection [SEVILLANO]

TestWins/Form1.cs

@@ -1,43 +1,108 @@
-using System.Drawing.Text;
 using TestWins.Controller;
+using TestWins.Model;
 
 namespace TestWins;
 
 public partial class Form1 : Form
 {
-    //business
-
     private readonly StudentController controller = new StudentController();
+
     public Form1()
     {
         InitializeComponent();
-        loadData();
+        LoadData();
     }
 
-    private void loadData()
+    private void LoadData()
     {
-        dataGridView1.DataSource = controller.getAll();
+        dataGridView1.DataSource = controller.GetAll();
     }
 
     private void btnAdd_Click(object sender, EventArgs e)
     {
-
+        try
+        {
+            var student = new Student
+            {
+                Name   = txtName.Text,
+                Age    = int.Parse(txtAge.Text),
+                Course = txtCourse.Text
+            };
+            controller.Add(student);
+            LoadData();
+            ClearFields();
+            MessageBox.Show("Student added successfully!");
+        }
+        catch (Exception ex) 
+        {
+            MessageBox.Show("Error: " + ex.Message);
+        }
     }
 
     private void btnUpdate_Click(object sender, EventArgs e)
     {
-
+        try
+        {
+            var student = new Student
+            {
+                StudentId = int.Parse(txtId.Text), 
+                Name      = txtName.Text,
+                Age       = int.Parse(txtAge.Text),
+                Course    = txtCourse.Text
+            };
+            controller.Update(student);
+            LoadData();
+            ClearFields();
+            MessageBox.Show("Student updated successfully!");
+        }
+        catch (Exception ex)
+        {
+            MessageBox.Show("Error: " + ex.Message); 
+        }
     }
 
     private void btnDelete_Click(object sender, EventArgs e)
     {
-
-
-
+        try
+        {
+            int id = int.Parse(txtId.Text);
+            var confirm = MessageBox.Show(
+                "Are you sure you want to delete this student?",
+                "Confirm Delete",
+                MessageBoxButtons.YesNo
+            );
+            if (confirm == DialogResult.Yes)
+            {
+                controller.Delete(id);
+                LoadData();
+                ClearFields();
+                MessageBox.Show("Student deleted successfully!");
+            }
+        }
+        catch (Exception ex) 
+        {
+            MessageBox.Show("Error: " + ex.Message);
+        }
     }
 
-    private void dataGridView1_CellClick(object sender, EventArgs e)
+
+    private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
     {
+        if (e.RowIndex >= 0)
+        {
+            DataGridViewRow row = dataGridView1.Rows[e.RowIndex];
+            txtId.Text     = row.Cells["StudentId"].Value.ToString();
+            txtName.Text   = row.Cells["Name"].Value.ToString();
+            txtAge.Text    = row.Cells["Age"].Value.ToString();
+            txtCourse.Text = row.Cells["Course"].Value.ToString();
+        }
+    }
 
+    private void ClearFields()
+    {
+        txtId.Text     = string.Empty;
+        txtName.Text   = string.Empty;
+        txtAge.Text    = string.Empty;
+        txtCourse.Text = string.Empty;
     }
 }

TestWins/model/FixedConnectionSql.cs

@@ -0,0 +1,66 @@
+using MySql.Data.MySqlClient;
+using TestWins.Model;
+
+namespace TestWins.Repository
+{
+    public class StudentRepository
+    {
+        private readonly FixedConnectionSql _db = new FixedConnectionSql(); 
+
+        public void Create(Student student)
+        {
+            using var conn = _db.connectSql();
+            conn.Open();
+            string query = "INSERT INTO students (name, age, course) VALUES (@name, @age, @course)";
+            using var cmd = new MySqlCommand(query, conn);
+            cmd.Parameters.AddWithValue("@name", student.Name);
+            cmd.Parameters.AddWithValue("@age", student.Age);
+            cmd.Parameters.AddWithValue("@course", student.Course);
+            cmd.ExecuteNonQuery();
+        }
+
+        public List<Student> GetAll() 
+        {
+            var list = new List<Student>();
+            using var conn = _db.connectSql(); 
+            conn.Open();
+            string query = "SELECT * FROM students";
+            using var cmd = new MySqlCommand(query, conn);
+            using var reader = cmd.ExecuteReader();
+            while (reader.Read())
+            {
+                list.Add(new Student
+                {
+                    StudentId = reader.GetInt32(0),
+                    Name     = reader.GetString(1),
+                    Age      = reader.GetInt32(2),  
+                    Course   = reader.GetString(3),
+                });
+            }
+            return list;
+        }
+
+        public void Update(Student student)
+        {
+            using var conn = _db.connectSql();
+            conn.Open();
+            string query = "UPDATE students SET name = @name, age = @age, course = @course WHERE id = @id";
+            using var cmd = new MySqlCommand(query, conn);
+            cmd.Parameters.AddWithValue("@id",     student.StudentId);
+            cmd.Parameters.AddWithValue("@name",   student.Name);
+            cmd.Parameters.AddWithValue("@age",    student.Age);    
+            cmd.Parameters.AddWithValue("@course", student.Course);
+            cmd.ExecuteNonQuery();
+        }
+
+        public void Delete(int id)
+        {
+            using var conn = _db.connectSql();
+            conn.Open();
+            string query = "DELETE FROM students WHERE id = @id";
+            using var cmd = new MySqlCommand(query, conn);
+            cmd.Parameters.AddWithValue("@id", id);
+            cmd.ExecuteNonQuery();
+        }
+    }
+}