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Information systems often use monotonically increasing sequence numbers for primary key columns, such as for orders, shipments, registrations, or invoices. You could implement this functionality with a small secondary table to maintain the last/current value for each primary key, but this approach is guaranteed to create performance problems in a multiuser environment. It is much better to use sequences in such cases. Before we continue, there is one important thing you should know about sequences: sequence values can show gaps. That means that certain sequence values may disappear and never make it into the column they were meant for. The Oracle DBMS cannot guarantee sequences without gaps (we won t go into the technical details of why this is true). Normally, this should not be a problem. Primary key values are supposed to be unique, and increasing values are nice for sorting purposes, but there is no reason why you shouldn t allow gaps in the values. However, if the absence of gaps is a business requirement, you have no choice other than using a small secondary table to maintain these values.

You can use the File Print Preview menu item to open a new window that displays a representation of what the printed document will look like (Figure 10-2). It s usually a good idea to open the Print Preview screen first, to get a feel for how the document record will appear. Buttons on this screen allow you to send the result to a printer (Print), advance or retreat among pages (Next Page, Prev Page), split the view so that two pages are displayed for each preview screen (Two Page), zoom in or zoom out (Zoom In, Zoom Out), and close the window (Close). You can find additional options by selecting File Page Setup (see Figure 10-3). The Page Setup dialog allows you to select the size of paper that will be used, the source of the paper feed (such as multitray printers), the orientation of the page (Portrait vs. Landscape), and the Left, Right, Top, and Bottom margins. You can also switch printers using the Printer button. Note that annotations embedded in a document appear highlighted in a printed output, just as they do in Concordance s Browse view. Terms that are highlighted in Browse view as a result of a search are underlined in the printed output. However, search terms that are part of an annotation won t be underlined, as they re part of the highlighted annotation. Printing in this way synchronizes with the Empties option (select Tools Empties). Recall that, when the Empties item has a check mark next to it from the Tools menu, all fields will be displayed in Browse view, even those that have no data. Toggling Empties by selecting it from the menu again suppresses empty fields, and only displays those fields that contain actual data.

The data_type column_info key is not restricted, so you may enter any type support by the type of database you have chosen. data_type => "INTEGER" The schema may also be deployed to other types of database, and the code does its best to convert the data_type into one for the target database (more on this in the Deploying to a Different Database System section). This key is used by the deployment mechanism in DBIx::Class to create an autoincrementing field. These are often used to create a unique primary key. is_auto_increment => 1

Note If absence of gaps is one of your business requirements, then you probably have a poorly conceived business requirement. You should consider investing some time into reforming your business requirements.

Sequences can be created, changed, and dropped with the following three SQL commands: CREATE SEQUENCE ALTER SEQUENCE DROP SEQUENCE

Figure 10-2. In this example of print preview, the One Page option is selected, so that only one page appears on each screen.

Note The names of the columns are created as accessors to get and set values for that column on each

Figure 7-16 shows the syntax diagram of the CREATE SEQUENCE command. The ALTER SEQUENCE command has a similar syntax.

Figure 10-3. Options in the Page Setup dialog pertain to the type of paper that will be used, page orientation, and margins.

result object. This means they must be valid Perl identifiers. If the column names in your database are not valid, add an accessor key that will be used to create the accessor method instead.

Figure 7-16. A CREATE SEQUENCE command syntax diagram A sequence definition may consist of a start value, increment value, minimum value, and maximum value. You can also specify whether the sequence generator should stop when reaching a boundary value, or CYCLE the sequence numbers within the minimum/maximum range. All sequence attributes are optional, as Figure 7-16 shows; they all have default values.