How do I write a query to provide relationship in different tables using C# winforms program.here is the below explaination.

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i have three tables named as register ,login , lostpassword..when iam inserting the data into tables they are working but the column named as regid is there in the three tables.so, how do i keep the relation between tables using query in c# program so that automatically regid column has to be updated in other tables too.how can i write the query?

What I have tried:

string s = "insert into REGISTER(EMAILID,USER_NAME,PASSWORD,MBLE_NUM,QUESTION1,ANSWER,QUESTION2,ANSWER2)VALUES(@EMAILID, @USER_NAME,@PASSWORD,@MBLE_NUM,@QUESTION1,@ANSWER,@QUESTION2,@ANSWER2)";
SqlCommand cmd = new SqlCommand(s, con);
cmd.Parameters.AddWithValue("@EMAILID", textBox1.Text);
cmd.Parameters.AddWithValue("@USER_NAME", textBox2.Text);
cmd.Parameters.AddWithValue("@PASSWORD", textBox3.Text);
cmd.Parameters.AddWithValue("@MBLE_NUM", textBox4.Text);
cmd.Parameters.AddWithValue("@QUESTION1", comboBox1.Text);
cmd.Parameters.AddWithValue("@ANSWER", textBox5.Text);
cmd.Parameters.AddWithValue("@QUESTION2", comboBox2.Text);
cmd.Parameters.AddWithValue("@ANSWER2", textBox6.Text);

string strng = "insert into LOGIN(USER_NAME,PASSWORD)VALUES(@USER_NAME,@PASSWORD)";
SqlCommand cm = new SqlCommand(strng, con);
cm.Parameters.AddWithValue("@USER_NAME", textBox2.Text);
cm.Parameters.AddWithValue("@PASSWORD", textBox3.Text);

string sg = "insert into RESET_MY_PASSWORD(EMAIL_ID,QUESTION1,ANSWER,QUESTION2,ANSWER2)VALUES(@EMAIL_ID,@QUESTION1,@ANSWER,@QUESTION2,@ANSWER2)";
SqlCommand sq = new SqlCommand(sg, con);
sq.Parameters.AddWithValue("@EMAIL_ID", textBox1.Text);
sq.Parameters.AddWithValue("@QUESTION1", comboBox1.Text);
sq.Parameters.AddWithValue("@ANSWER", textBox5.Text);
sq.Parameters.AddWithValue("@QUESTION2", comboBox2.Text);
sq.Parameters.AddWithValue("@ANSWER2", textBox6.Text);

cmd.ExecuteNonQuery();
cm.ExecuteNonQuery();
sq.ExecuteNonQuery();
this.Close();

Posted 25-Apr-17 21:41pm

saimanisha

Updated 27-Apr-17 5:07am

v3

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Comments

Richard Deeming 27-Apr-17 12:00pm

Never store passwords in plain text!

Secure Password Authentication Explained Simply[^]
Salted Password Hashing - Doing it Right[^]

Maciej Los 27-Apr-17 14:30pm

Sorry, i don't understand you...

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kosmas kafataridis · Accepted Answer · 2017-04-27T05:07:00

Hi
In your case i would use try and transaction. If the regid of table registration is specified as identity then

C#

try
            {
                SqlTransaction strns = con.BeginTransaction();
                try
                {

                    SqlCommand cmd = new SqlCommand("insert into REGISTER(EMAILID,USER_NAME,PASSWORD,MBLE_NUM,QUESTION1,ANSWER,QUESTION2,ANSWER2)VALUES(@EMAILID, @USER_NAME,@PASSWORD,@MBLE_NUM,@QUESTION1,@ANSWER,@QUESTION2,@ANSWER2); SELECT SCOPE_IDENTITY()", con);
                    cmd.Transaction = strns;
                    cmd.Parameters.AddWithValue("@EMAILID", textBox1.Text);
                    cmd.Parameters.AddWithValue("@USER_NAME", textBox2.Text);
                    cmd.Parameters.AddWithValue("@PASSWORD", textBox3.Text);
                    cmd.Parameters.AddWithValue("@MBLE_NUM", textBox4.Text);
                    cmd.Parameters.AddWithValue("@QUESTION1", comboBox1.Text);
                    cmd.Parameters.AddWithValue("@ANSWER", textBox5.Text);
                    cmd.Parameters.AddWithValue("@QUESTION2", comboBox2.Text);
                    cmd.Parameters.AddWithValue("@ANSWER2", textBox6.Text);
                    Int64 regid = (Int64)cmd.ExecuteScalar();
                    cmd.CommandText = "insert into LOGIN(regid, USER_NAME,PASSWORD)VALUES(@regid, @USER_NAME,@PASSWORD)";
                    cmd.Parameters.Clear();
                    cmd.Parameters.AddWithValue("@regid", regid);
                    cmd.Parameters.AddWithValue("@USER_NAME", textBox2.Text);
                    cmd.Parameters.AddWithValue("@PASSWORD", textBox3.Text);
                    cmd.ExecuteNonQuery();
                    cmd.CommandText = "insert into RESET_MY_PASSWORD(regid, EMAIL_ID,QUESTION1,ANSWER,QUESTION2,ANSWER2)VALUES(@regid, @EMAIL_ID,@QUESTION1,@ANSWER,@QUESTION2,@ANSWER2)";
                    cmd.Parameters.Clear();
                    cmd.Transaction = strns;
                    cmd.Parameters.AddWithValue("@regid", regid);
                    cmd.Parameters.AddWithValue("@EMAIL_ID", textBox1.Text);
                    cmd.Parameters.AddWithValue("@QUESTION1", comboBox1.Text);
                    cmd.Parameters.AddWithValue("@ANSWER", textBox5.Text);
                    cmd.Parameters.AddWithValue("@QUESTION2", comboBox2.Text);
                    cmd.Parameters.AddWithValue("@ANSWER2", textBox6.Text);
                    cmd.ExecuteNonQuery();
                    cmd.Dispose();
                    strns.Commit();
                }
                catch (Exception)
                {
                    strns.Rollback();
                    throw;
                }
            }
            catch (Exception ex)
            {

                System.Windows.Forms.MessageBox.Show(ex.Message);
            }