Question

I am attempting to insert an int value in a table (RamResults) on a database, the db structure is as follows:

Table Columns:
ID (Primary Key)
Results (int type)

In C# I attempt to insert a value into the Results column:

// Retrieve the connection string from the settings file.
string conString = Properties.Settings.Default.MyDBConnectionString;

// Open the connection using the connection string.
using (SqlCeConnection con = new SqlCeConnection(conString))
{
    con.Open();

    // Insert into the SqlCe table. ExecuteNonQuery is best for inserts.
    int num = 5;
    using (SqlCeCommand com = new SqlCeCommand(
                              "INSERT INTO RamResults VALUES(@num)", con))
    {
        com.Parameters.AddWithValue("@num", num);
        com.ExecuteNonQuery();
    }
}

But I get the following error:

The number of columns in the query and the table must match. [ Number
of columns in query = 1, Number of columns in table = 2 ]

I was under the impression that the primary key (ID) did not need any data inserted into it, as it would automatically assign an ID number in that column?

Edit:

Assuming that I need to autoincrement the PK, I can’t see how to do this when editing the table schema in VS 2010:

Answer 1

In your case seemes to that ID is not IDENTITY autoincrementing value and you should specify its value explicitly

INSERT INTO RamResults(Id, Results) VALUES(@Id, @num)

and you, of course, should provide the @id parameter’s value manually

OR

Should place the DEFAULT to the Id column, in your case – or NEWID() or NEWSEQUENTIALID()

In this case your query should look like this:

INSERT INTO RamResults(Id, Results) VALUES(DEFAULT, @num)

OR without DEFAULT constraint:

INSERT INTO RamResults(Id, Results) VALUES(NEWID(), @num)