C#将记录插入数据库表

Question

I have a database that contains a Customer table with the following columns : CustID, CustName, ICNumber, ContactNumber and Address. It is a service-based database.

string localdb = ConfigurationManager.ConnectionStrings["DatabaseConnectionString"].ConnectionString;

SqlConnection con = new SqlConnection(localdb);
con.Open();
SqlCommand cmd = new SqlCommand("INSERT INTO Customer(CustID,CustName,ICNumber,ContactNumber,Address)values(@CustID,@CustName,@ICNumber,@ContactNumber,@Address)", con);

                        cmd.Parameters.AddWithValue("@CustID", txtCustID.Text);
                        cmd.Parameters.AddWithValue("@CustName", txtCustName.Text);
                        cmd.Parameters.AddWithValue("@ICNumber", txtICNum.Text);
                        cmd.Parameters.AddWithValue("@ContactNumber", txtContact.Text);
                        cmd.Parameters.AddWithValue("@Address", txtAddress.Text);
                        cmd.ExecuteNonQuery();
                        con.Close();

The code compiles and runs. The problem I am having is that the record is not added into the table after cmd.ExecuteNonQuery(); is called.

Why is the record not showing up in the database table?

Answer 1

You forgot to close the quotes " on the insert command. It is nice to use try/catch to avoid problems with your insert, for sample:

string localdb = ConfigurationManager.ConnectionStrings["DatabaseConnectionString"].ConnectionString;

try
{
    SqlConnection con = new SqlConnection(localdb))


    con.Open();

    SqlCommand cmd = new SqlCommand("INSERT INTO Customer(CustID, CustName, ICNumber, ContactNumber, Address) VALUES (@CustID, @CustName, @ICNumber, @ContactNumber, @Address)", con);
    cmd.Parameters.AddWithValue("@CustID", txtCustID.Text);
    cmd.Parameters.AddWithValue("@CustName", txtCustName.Text);
    cmd.Parameters.AddWithValue("@ICNumber", txtICNum.Text);
    cmd.Parameters.AddWithValue("@ContactNumber", txtContact.Text);
    cmd.Parameters.AddWithValue("@Address", txtAddress.Text);
    cmd.ExecuteNonQuery();
}
catch
{
    // some errors 
}
finally 
{
    if (con.State == ConnectionState.Open)
       con.Close();
}