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Most users find this approach more appealing than being forced to enter a date in a strict format through a masked edit control, or having to always use the mouse to use a graphical calendar control. Of course, being able to additionally support a calendar control is also a great UI design choice. Date handling is also quite challenging because the standard DateTime data type doesn t have any comprehension of an empty or blank date. Many applications have date values that may be empty for a time and are filled in later. Consider a sales order, in which the shipment date is unknown when the order is entered. That date should remain blank or empty until an actual date is known. Without having the concept of an empty date, an application will require the user to enter an invalid placeholder date until the real date is known; and that s just poor application design.

cc int ha_spartan::index_read(byte * buf, const byte * key, uint key_len __attribute__((unused)), enum ha_rkey_function find_flag __attribute__((unused))) { long long pos; DBUG_ENTER("ha_spartan::index_read"); if (key == NULL) pos = share->index_class->get_first_pos(); else pos = share->index_class->get_index_pos((byte *)key, key_len); if (pos == -1) DBUG_RETURN(HA_ERR_KEY_NOT_FOUND); current_position = pos + share->data_class->row_size(table->s->rec_buff_length); share->data_class->read_row(buf, table->s->rec_buff_length, pos); share->index_class->get_next_key(); DBUG_RETURN(0); }.

In the early 1990s, I worked at a company where all far-future dates were entered as 12/31/99. Guess how much trouble the company had around Y2K, when all of its never-to-be-delivered orders started coming due!

We re interested in managing only the exclusion list, so delete everything except Managed Background Sync Exclusions. The result appears in Figure 12-17.

The next index method is index_read_idx(). It is similar to the index_read() method but is called from other portions of the optimizer (e.g., where there is at most one matching row see sql_select.cc for details). This method sets the row buffer to the row in the file that matches the key. If the key passed in is null, then the method should return the first key value and the first row in the file. Locate the index_read_idx() method and add the code to get the file position from the index and read a row from the data file. Listing 7-50 shows the method with the changes. Listing 7-50. Changes to the index_read_idx() Method in ha_spartan.cc int ha_spartan::index_read_idx(byte * buf, uint index, const byte * key, uint key_len __attribute__((unused)), enum ha_rkey_function find_flag __attribute__((unused))) { long long pos; DBUG_ENTER("ha_spartan::index_read_idx"); pos = share->index_class->get_index_pos((byte *)key, key_len); if (pos == -1) DBUG_RETURN(HA_ERR_KEY_NOT_FOUND); share->data_class->read_row(buf, table->s->rec_buff_length, pos); DBUG_RETURN(0); } The next index method is index_next(). This method gets the next key in the index and returns the matching row from the data file. It is called during range index scans. Locate the index_next() method and add the code to get the next key from the index and read a row from the data file. Listing 7-51 shows the method with the changes. Listing 7-51. Changes to the index_next() Method in ha_spartan.cc int ha_spartan::index_next(byte * buf) { byte *key = 0; long long pos; DBUG_ENTER("ha_spartan::index_next"); key = share->index_class->get_next_key(); if (key == 0) DBUG_RETURN(HA_ERR_END_OF_FILE); pos = share->index_class->get_index_pos((byte *)key, get_key_len()); share->index_class->seek_index(key, get_key_len()); share->index_class->get_next_key(); if (pos == -1) DBUG_RETURN(HA_ERR_KEY_NOT_FOUND); share->data_class->read_row(buf, table->s->rec_buff_length, pos); DBUG_RETURN(0); }

It is true that the Nullable<T> type can be applied to a DateTime value like this: Nullable<DateTime>. This allows a date to be empty in a limited sense. Unfortunately, that isn t enough for many applications, since an actual date value can t be meaningfully compared to a null value. Is the null value greater than or less than a given date With Nullable<T>, the answer is an exception, which is not a very useful answer. Additionally, data binding doesn t deal well with null values, and so exposing a null value from a business object s property often complicates the UI code.