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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.

The output of this listing depends on the listener. This is an instance of the RenderListener interface to which the processor passes information about the text and images in the page. The following listing is an experimental implementation that will help you understand the mechanism.

3. As you drag the field, a light gray bar will appear above the Total WO field, indicating where the field will be dropped (see Figure 4-9).

public class MyTextRenderListener implements RenderListener { protected PrintWriter out; public MyTextRenderListener(PrintWriter out) {

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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.

this.out = out; } public void beginTextBlock() { BT is out.print("<"); encountered } public void endTextBlock() { out.println(">"); } public void renderImage(ImageRenderInfo renderInfo) { } public void renderText(TextRenderInfo renderInfo) { out.print("<"); out.print(renderInfo.getText()); out.print(">"); } }

You re not concerned with images yet. Angle brackets are placed at the start and end of text blocks, and every text segment is enclosed in angle brackets. If you use this method on the PDF created with listing 15.21, you ll get the following results:

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.

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