How to save and update data

Question

4.00/5 (1 vote)

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public static void AddNewStudent(int Stu_id, string Stu_Name, string Class, string Major)
  {
  OracleDatabase db =(OracleDatabase)DatabaseFactory.CreateDatabase("PHTS");
 using (System.Data.Common.DbCommand cmd = db.GetStoredProcCommand("AddNewStudent"))  
           {
  db.AddInParameter(cmd, "I_Stu_id", DbType.Int32, Stu_id);
  db.AddInParameter(cmd, "I_Stu_Name", DbType.String, Stu_Name);
  db.AddInParameter(cmd, "I_Class", DbType.String, Class);
  db.AddInParameter(cmd, "I_Major", DbType.String, Major);
    db.ExecuteNonQuery(cmd);
            }
  }

public static void UpdateStudent(int Stu_id, string Stu_Name, string Class, string Major)
  {
  OracleDatabase db =(OracleDatabase)DatabaseFactory.CreateDatabase("PHTS");
 using (System.Data.Common.DbCommand cmd = db.GetStoredProcCommand("UpdateStudent"))  
           {
  db.AddInParameter(cmd, "I_Stu_id", DbType.Int32, Stu_id);
  db.AddInParameter(cmd, "I_Stu_Name", DbType.String, Stu_Name);
  db.AddInParameter(cmd, "I_Class", DbType.String, Class);
  db.AddInParameter(cmd, "I_Major", DbType.String, Major);
    db.ExecuteNonQuery(cmd);
            }
  }

User Interface

C#

private void Savebutton_Click(object sender, EventArgs e)
        {
            int student_id = Convert.ToInt32(this.SIDtextBox.Text);
            string stu_name = this.textBox1.Text;
            string class = this.textBox2.Text;
            string major= this.textBox3.Text;;

if(stu_id ==0)
{
            
PHTS.DataServices.cslMaterial.AddNewStudent(stu_id, stu_name, class, major);
            MessageBox.Show("Record Saved");
}
else
{

PHTS.DataServices.cslMaterial.UpdateStudent(stu_id, stu_name, class, major);
            MessageBox.Show("Record Saved");
}


        }

I changed the code and insterted a if statement but still not working. Can anyone help me how can a user save and update data using the same button.

Thanks

Posted 3-Aug-11 10:18am

rbjanaki

Updated 4-Aug-11 5:05am

v2

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Christian Graus · Answer 1 · 2011-08-03T11:12:00

Solution 1

If your student already exists, call update. If not, call save.

Posted 3-Aug-11 11:12am

Christian Graus

v2

_Maxxx_ · Answer 2 · 2011-08-03T15:52:00

Solution 2

There's a number of ways.

You know that the Id must be null for a non-existing student (or maybe zero as you're storing it in an int)

So, either in c# code you can say "if the student id is zero call insert stored proc, else call update stored proc"

or you could have a single stored proc that says "if the Id is 0 insert the record, else update the record with the Id passed in.

Posted 3-Aug-11 15:52pm

_Maxxx_

Comments

rbjanaki 4-Aug-11 11:42am

how can I add a zero to non-existing student_id

_Maxxx_ 5-Aug-11 0:27am

I don't know what you mean? in the code you show, it appears you get the Id from a text box, and that it is zero when creating a new student - you pass that as a parameter to the stored proc.
If I am misunderstanding, maybe try rephrasing your question?