public void EditBaiHat(QLBaiHat strBH)
{
string sql = "UPDATE BaiHat SET MaBH = N'" + strBH.MaBH + "',TenBH =N'" + strBH.TenBH + "',TacGia = N'" + strBH.TacGia + "'WHERE Id=" + strBH.ID;
SqlConnection con = db.getConnection();
SqlCommand cmd = new SqlCommand(sql, con);
con.Open();
cmd.ExecuteNonQuery();
cmd.Dispose();
con.Close();
}
public void Delete(QLBaiHat strBH)
{
string sql = "DELETE FROM BaiHat WHERE Id =" + strBH.ID;
SqlConnection con = db.getConnection();
SqlCommand cmd = new SqlCommand(sql, con);
con.Open();
cmd.ExecuteNonQuery();
cmd.Dispose();
con.Close();
}
public void AddBaiHat(QLBaiHat strBH)
{
string sql = "INSERT INTO BaiHat(MaBH,TenBH,TacGia) VALUES(N'" + strBH.MaBH + "',N'" + strBH.TenBH + "',N'" + strBH.TacGia + "')";
//Tao ket noi csdl
SqlConnection con = db.getConnection();
SqlCommand cmd = new SqlCommand(sql, con);
con.Open();
cmd.ExecuteNonQuery(); //chay cau lenh truy van cmd
cmd.Dispose();
con.Close();
}
//phuowng thuc lay du lieu tu csdl
public List <QLBaiHat> getBaiHat(string ID)
{
string sql;
if (string.IsNullOrEmpty(ID))
{
sql = "SELECT * FROM BaiHat";
}
else
{
sql = "SELECT * FROM BaiHat WHERE ID = " + ID;
}
List <QLBaiHat> strList = new List <QLBaiHat>();
SqlConnection con = db.getConnection();
SqlDataAdapter cmd = new SqlDataAdapter(sql, con);
DataTable dt = new DataTable();
//Mo ket noi;
con.Open(); // mo ket noi
cmd.Fill(dt); // do toan bo du lieu truy van duoc vao DataTable
//dong ket noi
cmd.Dispose(); //ngat cau lenh do du lieu vao cmd.fill(dt);
con.Close();
QLBaiHat strBH;
for (int i = 0; i < dt.Rows.Count; i++)
{
strBH = new QLBaiHat();
strBH.ID = Convert.ToInt32(dt.Rows[i]["Id"].ToString());
strBH.MaBH = dt.Rows[i]["MaBH"].ToString();
strBH.TenBH = dt.Rows[i]["TenBH"].ToString();
strBH.TacGia = dt.Rows[i]["TacGia"].ToString();
strList.Add(strBH);
}
return(strList);
}
