为什么我的C＃代码没有更新SQL Server数据库，尽管我得到了正确的受影响行数

Question

I created the following code:

public static bool setHeadword(int id, string headword)
{       
    SqlConnection conn = new SqlConnection();
    conn.ConnectionString = "Data Source=(LocalDB)\\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\\pms.mdf;Integrated Security=True";
    conn.Open();

    SqlCommand command = new SqlCommand("UPDATE headwords SET Headword = @headword WHERE Id = @id", conn);

    command.Parameters.AddWithValue("@headword", headword);
    command.Parameters.AddWithValue("@id", id);

    int result = command.ExecuteNonQuery();
    conn.Close();

    return true;
}

But the code doesn't work because the value in the database doesn't change. If I run the code manually in the database the change takes place. But it won't work with C#.

Also the result variable are holding the right number of affected rows (1 in this case).

I'm not sure I have to flush the changes or something else.

Thanks for your help and best regards Franz

Answer 1

static void Update(int id, string headword)
{
   try
   {    
   //You should create connectionString with correct details otherwise fail connection
    string connectionString =
        "server=.;" +
        "initial catalog=employee;" +
        "user id=sa;" +
        "password=123";
    using (SqlConnection conn =
        new SqlConnection(connectionString))
    {
        conn.Open();
        using (SqlCommand cmd =
            new SqlCommand("UPDATE headwords SET Headword=@headword" +
                " WHERE Id=@Id", conn))
        {
            cmd.Parameters.AddWithValue("@Id", id);
            cmd.Parameters.AddWithValue("@headword", headword);

            int rows = cmd.ExecuteNonQuery();


        }
    }
   }
catch (SqlException ex)
{
    //Handle sql Exception
}

}