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Luckily we can try again: script/dbauthtest_createpl model AuthDB DBIC::Schema Auth::Schema \ create=static components=TimeStamp dbi:SQLite:authdb Now if we look in any of our Result files (eg, in Auth::Schema::Result::Users), we see the following: __PACKAGE__->load_components("InflateColumn::DateTime", "TimeStamp", "Core"); DBIx::Class::TimeStamp overrides the insert and update methods to write the current date and time into a column value TimeStamp will update or set only on columns we ask it to change It relies on the column information in the Result files indicating which columns need to be updated, so we alter the Userspm file..

available space at the end of the page where the record will start only allows for three lines to appear, the entire record is forced down to a new page. The number in the Orphans field borrows lines from a previous page until the specified number of lines appears at the top of the next page. For example, if a document record spans into a second page so that only a single line appears on the new page, the number in the Orphans field will force the report to move lines from the previous page to the new page until the numbers match. Note that this borrowing of lines might cause the number of lines on the previous page to fall under the threshold set by the Windows text field. When this happens, the entire document record is moved to a new page.

Figure 7-20. A COMMENT command syntax diagram Listing 7-19 shows how you can use the COMMENT command to add comments to the data dictionary for a table (SALGRADES) and a column (EMPLOYEES.COMM), and how you can retrieve that information from the data dictionary. Listing 7-19. Adding Comments to Columns and Tables SQL> comment on table salgrades 2 is 'Salary grades and net bonuses'; Comment created. SQL> comment on column employees.comm 2 is 'For sales reps only'; Comment created. SQL> select comments 2 from user_tab_comments 3 where table_name = 'SALGRADES'; COMMENTS ------------------------------------------Salary grades and net bonuses SQL> 2 3 4 select from where and comments user_col_comments table_name = 'EMPLOYEES' column_name = 'COMM';

COMMENTS ------------------------------------------For sales reps only SQL> Think of adding comments like documentation. The little extra effort to document your columns and tables will help define and clarify your objects if questions arise in the future.

The Print tab allows you to make final formatting changes, and to save current print settings as a profile that can be retrieved later (see Figure 10-8).

The two configuration keys used by the TimeStamp component are set_on_create and set_on_update. It uses these to determine when to update a column s value. However, we shouldn t edit column definitions in the Result classes if we want to be able to rerun DBIx::Class::Schema::Loader again, so instead we can add the following, after the do not modify comment line: __PACKAGE__->add_columns('last_modified', { %{__PACKAGE__->column_info('last_modified') }, set_on_create => 1, set_on_update => 1 }); This code comes after the existing last_modified column definition, and so it adds to the previous definition in the file. It includes the existing definition by fetching it using column_info on the package. This existing definition and the new keys, set_on_create and set_on_update, make up the new definition for this column. last_modified will now default to the date the user is created, and it will be re-updated to the current date every time we update that row. The actual effect of components will be shown later. Now you ve seen most of the elements that make up a DBIx::Class schema representing a simple set of tables. You can use these ideas to add your own tables to the schema as described. You ve seen how to add components, but not what they are for yet, which is a mystery that will be solved later on in this chapter.