Insert blank data into the database

Question

1.00/5 (1 vote)

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i want to insert data into database. but if there are no records and i click on the button.so no data should be inserted. please check my codes

What I have tried:

SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=MYDB;Integrated Security=True");
           con.Open();
           SqlCommand cmd;
           string query = "insert into Employee(ID,Name, Age, Department, Salary, DateOFBirth) values(@ID,@Name, @Age, @Department, @Salary, @DateOFBirth)";

              cmd = new SqlCommand(query,con);
           if (cmd.CommandText == "")
           {
               cmd.Parameters.AddWithValue("@ID",null);
               cmd.Parameters.AddWithValue("@Name",null);
               cmd.Parameters.AddWithValue("@Age",null);
               cmd.Parameters.AddWithValue("@Department",null);
               cmd.Parameters.AddWithValue("@Salary",null);
               cmd.Parameters.AddWithValue("@DateOFBirth",null);

           }
           else
           {
               cmd.Parameters.AddWithValue("@ID", textBox1.Text);
               cmd.Parameters.AddWithValue("@Name", textBox2.Text);
               cmd.Parameters.AddWithValue("@Age", textBox3.Text);
               cmd.Parameters.AddWithValue("@Department", textBox4.Text);
               cmd.Parameters.AddWithValue("@Salary", textBox5.Text);
               cmd.Parameters.AddWithValue("@DateOFBirth", textBox6.Text);

           }


           cmd.ExecuteNonQuery();
           con.Close();

Posted 1-May-17 0:02am

faizy001

Updated 1-May-17 0:43am

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Comments

ZurdoDev 1-May-17 7:02am

1. I do not understand what your question is.
2. You If statement means nothing. You just created the cmd object and then check if CommandText is blank. Of course it is blank, you just created it. So, it will always be sending null. The proper way to send null is DBNull.Value, not null.

[no name] 1-May-17 7:05am

It should be obvious what you problem is. The command text would never be an empty string. You need to learn how to use the debugger.

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P_Z · Answer 1 · 2017-05-01T00:43:00

Solution 1

Did you try to replace null with

DBNull.Value

?

Posted 1-May-17 0:43am

P_Z

Comments

faizy001 1-May-17 6:56am

YES I DID BUT
string query = "insert into Employee(ID,Name, Age, Department, Salary, DateOFBirth) values(@ID,@Name, @Age, @Department, @Salary, @DateOFBirth)";

cmd = new SqlCommand(query,con);
if (cmd.CommandText==null)
{
cmd.Parameters.AddWithValue("@ID",Convert.ToInt32(DBNull.Value));
cmd.Parameters.AddWithValue("@Name",DBNull.Value);
cmd.Parameters.AddWithValue("@Age",DBNull.Value);
cmd.Parameters.AddWithValue("@Department",DBNull.Value);
cmd.Parameters.AddWithValue("@Salary",DBNull.Value);
cmd.Parameters.AddWithValue("@DateOFBirth",DBNull.Value);

}
else
{
cmd.Parameters.AddWithValue("@ID", textBox1.Text);
cmd.Parameters.AddWithValue("@Name", textBox2.Text);
cmd.Parameters.AddWithValue("@Age", textBox3.Text);
cmd.Parameters.AddWithValue("@Department", textBox4.Text);
cmd.Parameters.AddWithValue("@Salary", textBox5.Text);
cmd.Parameters.AddWithValue("@DateOFBirth", textBox6.Text);

}

cmd.ExecuteNonQuery();
con.Close();
BUT PROBLEM ARE STRILL SAME