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The body of the function is between the beginning and ending $$. The following code snippet represents the typical way we ll code our functions that return data. The bold line executes the query we re interested in, and the rest is auxiliary code required to return the results of that query. DECLARE outDepartmentListRow department_list; BEGIN FOR outDepartmentListRow IN SELECT department_id, name FROM department LOOP RETURN NEXT outDepartmentListRow; END LOOP; END; So what happens here The body of the function starts with the DECLARE section, which declares the variables that will be used by the function. Unlike with functions in other languages, a PL/pgSQL function has a special place where you can declare variables. In this case, the name of the variable is outDepartmentListRow, and its type is department_list. The code that performs the actual functionality is written between BEGIN and END. The syntax may look weird at first, but what it does is pretty straightforward. If you remember, the function is declared to return a set of values of the department_list type, and this is what it does. The function executes the SELECT statement, fetches each row of the results into the outDepartmentListRow variable (which is of the department_list type), and returns this variable. When this function finishes executing, it will have returned a set of department_list values.

Calculated (Calculation Based on Other Columns)

constraint GENDER_OT_UK unique ( code ) using index tablespace USERS pctfree 20 storage (initial 10K next 10K pctincrease 0); The CREATE TABLE syntax used in Listing 6-7 is as follows:

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The business tier (or middle tier) is said to be the brains of the application because it manages the application s business logic. However, for simple tasks such as getting a list of departments from the data tier, the business tier doesn t have much logic to implement. It just requests the data from the database and passes it to the presentation tier. In this chapter, we re building the foundation of the business layer, which includes the functionality to open and close database connections, store SQL logic as PostgreSQL functions, and access these functions from PHP . For the business tier of the departments list, you ll implement two classes: DatabaseHandler will store the common functionality that you ll reuse whenever you need to access the database. Having this kind of generic functionality packed in a separate class saves keystrokes and avoids bugs in the long run. Catalog contains product catalog-specific functionality, such as the GetDepartments method that will retrieve the list of departments from the database.

CREATE TABLE <table_name> OF <type_name>; where <table_name> is the name of the table to create, and <type_name> is the user-defined TYPE to use instead of column names for the table. There isn t a lot of extra work to creating an object table vs. a relational table, now is there Here s the rundown: On lines 6 through 8, I use the new syntax to create a table of one user-defined TYPE instead of one or more predefined scalar data types. I ve commented out lines 10 through 12, because I ve already created this sequence for the relational table. On lines 14 through 19, I create a primary key on the object table, just as I did on the relational table. On lines 21 through 26, I create a unique key on the object table, just as I did on the relational table.

A calculated field is a computation based on other fields in the row. For example, in Figure 4-5, you can see the formula for Total Miles by adding Flight Miles to Bonus Miles.

The SQL queries you write must be sent somehow to the database engine for execution. As you learned in 2, you ll use PHP PDO to access the PostgreSQL server. Before writing the business tier code, you need to analyze and understand the possibilities for implementation. The important questions to answer before writing any code include the following: What strategy should you adopt for opening and closing database connections, when you need to execute an SQL query Which methods of PHP PDO should you use for executing database functions and returning the results How should you handle possible errors and integrate the error-handling solution with the error-handling code you wrote in 2 Let s have a look at each of these questions one by one, and then we ll start writing some code.

Once again, it s your turn. For this exercise, create an object table named WORKER_TYPE_OT for the Worker Type code table. 1. Write a script to create an object table based on user-defined TYPE WORKER_TYPE_O. 2. Save your script as worker_type_ot.tab. 3. Execute your script to create the object view: @worker_type_ot.tab. 4. Create a test unit script and test your new object view. I ll indulge you. Listing 6-8 is my solution to this exercise. Listing 6-8. An Example of an Object Table Script for WORKER_TYPE_OT, worker_type_ot.tab 01 02 03 04 05 06 07 rem worker_type_ot.tab rem by Donald J. Bales on 12/15/2006 rem Create an object table for the Worker Type codes --drop table WORKER_TYPE_OT; create table WORKER_TYPE_OT of WORKER_TYPE_O tablespace USERS pctfree 20

CH APT ER 6 JUST LI KE IT IS I N T HE REAL WO RLD !

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