//....................Method to update data in database from our app....................
//Method to update data in database from our app
public bool Update(SubjectClass s)
{
//create a default return type and set its default value to false
bool isSuccess = false;
SqlConnection conn = new SqlConnection(myconnstring);
try
{
//sql to update data in our database
string sql = "UPDATE Subjects SET SubjectName=@SubjectName, SubjectCode=@SubjectCode, OfferedYear=@OfferedYear, OfferedSem=@OfferedSem, LecHours=@LecHours, LabHours=@LabHours, TuteHours=@TuteHours, EvaluHours=@EvaluHours WHERE SubjectID=@SubjectID";
//create sql commend
SqlCommand cmd = new SqlCommand(sql, conn);
//create parameters to add values
cmd.Parameters.AddWithValue("@SubjectID", s.SubjectID);
cmd.Parameters.AddWithValue("@SubjectName", s.SubjectName);
cmd.Parameters.AddWithValue("@SubjectCode", s.SubjectCode);
cmd.Parameters.AddWithValue("@OfferedYear", s.OfferedYear);
cmd.Parameters.AddWithValue("@OfferedSem", s.OfferedSem);
cmd.Parameters.AddWithValue("@LecHours", s.LecHours);
cmd.Parameters.AddWithValue("@LabHours", s.LabHours);
cmd.Parameters.AddWithValue("@TuteHours", s.TuteHours);
cmd.Parameters.AddWithValue("@EvaluHours", s.EvaluHours);
//open database connection
conn.Open();
int rows = cmd.ExecuteNonQuery();
//if the query rund successfylly then the value of rows will be grater than zero else values will be 0
if (rows > 0)
{
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception ex)
{
}
finally
{
conn.Close();
}
return(isSuccess);
}
//....................Insert Data into database....................
public bool Insert(SubjectClass s)
{
//creating default return type and setting its values to false
bool isSuccess = false;
//step 1: connect Database
SqlConnection conn = new SqlConnection(myconnstring);
try
{
//Step 2: create a sql query to insert data
string sql = "INSERT INTO Subjects (SubjectName, SubjectCode, OfferedYear, OfferedSem, LecHours, LabHours, TuteHours, EvaluHours) VALUES (@SubjectName, @SubjectCode, @OfferedYear, @OfferedSem, @LecHours, @LabHours, @TuteHours, @EvaluHours)";
//creating sql commend using sql and conn
SqlCommand cmd = new SqlCommand(sql, conn);
//Creat parameter to add data
cmd.Parameters.AddWithValue("@SubjectName", s.SubjectName);
cmd.Parameters.AddWithValue("@SubjectCode", s.SubjectCode);
cmd.Parameters.AddWithValue("@OfferedYear", s.OfferedYear);
cmd.Parameters.AddWithValue("@OfferedSem", s.OfferedSem);
cmd.Parameters.AddWithValue("@LecHours", s.LecHours);
cmd.Parameters.AddWithValue("@LabHours", s.LabHours);
cmd.Parameters.AddWithValue("@TuteHours", s.TuteHours);
cmd.Parameters.AddWithValue("@EvaluHours", s.EvaluHours);
//open connection here
conn.Open();
int rows = cmd.ExecuteNonQuery();
//if the query successfully then value of rows will be generate than zero else its value will be 0
if (rows > 0)
{
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception ex)
{
}
finally
{
conn.Close();
}
return(isSuccess);
}
//....................method to delete data from database....................
public bool Delete(SubjectClass s)
{
//create a default values and set its values to false
bool isSuccess = false;
//create sql connection
SqlConnection conn = new SqlConnection(myconnstring);
try
{
//sql to delete data
string sql = "DELETE FROM Subjects WHERE SubjectID=@SubjectID";
//create sql commend
SqlCommand cmd = new SqlCommand(sql, conn);
cmd.Parameters.AddWithValue("@SubjectID", s.SubjectID);
//open connection
conn.Open();
int rows = cmd.ExecuteNonQuery();
//if the query rund successfylly then the value of rows will be grater than zero else values will be 0
if (rows > 0)
{
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception ex)
{
}
finally
{
//cloase connection
conn.Close();
}
return(isSuccess);
}
