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once, just as it should be a goal to write the same code routine once and only once, and then use it as a subroutine. To that end, I create table packages or TYPEs that employ the same set of polymorphic commands to provide a PL/SQL method in place of writing many of the same SQL statements over and over again.
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As you saw earlier in the book, I use a database architecture where I always store the primary key, which is a sequence-generated ID value that points to a code, into a content or intersection table. I never store the code or description value. Why First, modifying the code or description of a given code table entry will require only an UPDATE against the code table. The next time the code and description values are retrieved for a particular ID value, they will then be the new values. The primary key, the ID, will always be the same value, but the code and description values can change without impacting the content and intersection tables that have stored the ID value in question. Second, in an internationalized application, I can transparently switch the code and description values to those with the same meaning in another language, because the only value that is immutable is the ID. With that in mind, think about this. We code programs in English, therefore we should be able to program access to codes in English, and that s why the first method I m going to talk about exists.
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get_id()
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Since we code our programs in English, we should be able to specify our code entries as constant values in our programs in English. So anytime you need to get the ID value for a particular code value in English, you call FUNCTION get_id(aiv_code), passing it a code value in English, and it returns the corresponding ID value. If the code you specify does not exist, the underlying singleton SQL SELECT statement raises a NO_DATA_FOUND exception, which you must handle in your calling program unit. Here s an example of the method from code table package WORKER_TYPE_TS: FUNCTION get_id( aiv_code return n_worker_type_id begin select into from where
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WORKER_TYPE_T.code%TYPE ) WORKER_TYPE_T.worker_type_id%TYPE is WORKER_TYPE_T.worker_type_id%TYPE;
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worker_type_id n_worker_type_id WORKER_TYPE_T code = aiv_code;
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return n_worker_type_id; end get_id; Once this method is written and in use, one and only one SQL statement need ever be written to retrieve an ID for a specified code value. You will see me use this method quite often in a data migration, data processing, and reporting program units. First, I get the ID values as
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CHAPTER 10 FAIRY TALES
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pseudo-constants in the initialization section of a package whenever there is a small number codes in scope. Next, I reduce the number of tables used in a corresponding cursor s SQL SELECT statement. Instead, I use an IF statement to assign the code entry s code and description values inside the cursor s FOR LOOP. You ll see some examples of this practice later in this chapter, in the Reporting section.
get_code_descr()
Once you ve decided to use a database architecture where every assigned code value is stored as an ID value, you ll need some way to retrieve the code and description values so they can be displayed in the presentation layer, whether it is for data entry or reporting. And that s the purpose of this method. If you need the code and description values for a specific ID value, you simply call PROCEDURE get_code_descr(ain_id, aov_code, aov_descr), passing it the corresponding ID value. The method returns the code and description values as OUT parameter values. If the ID you specify does not exist, the underlying singleton SQL SELECT statement raises a NO_DATA_FOUND exception, which you must handle in your calling program unit. Here s an example of the method from code table package WORKER_TYPE_TS: PROCEDURE get_code_descr( ain_worker_type_id aov_code aov_description
WORKER_TYPE_T.worker_type_id%TYPE, out WORKER_TYPE_T.code%TYPE, out WORKER_TYPE_T.description%TYPE ) is
begin select code, description into aov_code, aov_description from WORKER_TYPE_T where worker_type_id = ain_worker_type_id; end get_code_descr; Once again, after this method is written and in use, one and only one SQL statement need ever be written to retrieve a code and description for a specified code ID value. Similar functions can be written to get just the code value or description value, and they would be appropriately named get_code() and get_descr().
get_code_id_descr()
If an application is written for a high volume of data entry, the GUI in question will present a field for the entry of a code value and a second field to display the specified code s description value. The users may also have an icon they can click to see a pop-up list of code values from which to select. The typical end-user action in this design is for the end user to specify all or part of a code value, and then to tab into the next modifiable field, at which point, the presentation layer validates the user s code value entry. That s what this method is for: validation. In order to validate a code value, simply pass the code value to PROCEDURE get_code_id_descr(aiov_code, aon_id, aov_description, aid_on). This procedure first tries to find an exact code value match for the specified point in time. If it does not find a match, the
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