How to use INSERT INTO statement for a table having one to many relation

Question

I'm trying to create a log table that will log every login attempt.

I get this error:

You cannot add or change a record because a related record is required in table 'MyUser'.

MyUser.Username is primary key and UserLog.username is foreign key.

Code:

string query = "INSERT INTO Userlog(username,lTime) VALUES (@1,@2)"; 

OleDbCommand cmd = new OleDbCommand(query, conn);
cmd.Parameters.Add("@1", OleDbType.Char, 20).Value = user;
cmd.Parameters.Add("@2", OleDbType.Char, 20).Value = DateTime.Now.ToString();

try
{
     cmd.ExecuteNonQuery();
}
catch (Exception)
{
     throw;
} 

Answer 1

As written by Steve:

Before INSERT INTO Userlog , check that the username exists in MyUser . If not, insert there first.

Or in your use case, that was probably someone who mistyped their username. You should log that separately, or not at all.