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1. Load pgAdmin III, and connect to the hatshop database. 2. Click Tools Query tool (or click the SQL button on the toolbar). A new query window should appear. 3. Use the query tool to execute this code, which creates the catalog_get_departments function in your hatshop database: -- Create catalog_get_departments function CREATE FUNCTION catalog_get_departments() RETURNS SETOF department LANGUAGE plpgsql AS $$ DECLARE outDepartmentRow department; BEGIN FOR outDepartmentRow IN SELECT department_id, name, description FROM department ORDER BY department_id LOOP

Let s see, what would we like a text-based formatting tool to do for us How about the following: Read a specification and format the output Remove any single-line or multiline comment delimiters Preserve any hard carriage returns in order to maintain vertical spacing Preserve any space or tab indentation in order to maintain horizontal spacing Using PL/SQL, we can accomplish these tasks: Read through the source code of a specification by accessing view SYS.ALL_SOURCE

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RETURN NEXT outDepartmentRow; END LOOP; END; $$; catalog_get_departments is the simplest function you ll implement here. It returns the complete list of departments with their identities, names, and descriptions. This is almost similar to the catalog_get_departments_list function called to fill the departments list from the storefront, but this one also returns the descriptions and doesn t need to create a type for the returned data because we already have it from the creation of the department table. 4. Use the query tool to execute this code, which creates the catalog_update_department function in your hatshop database: -- Create catalog_update_department function CREATE FUNCTION catalog_update_department( INTEGER, VARCHAR(50), VARCHAR(1000)) RETURNS VOID LANGUAGE plpgsql AS $$ DECLARE inDepartmentId ALIAS FOR $1; inName ALIAS FOR $2; inDescription ALIAS FOR $3; BEGIN UPDATE department SET name = inName, description = inDescription WHERE department_id = inDepartmentId; END; $$; The catalog_update_department function updates the name and description of an existing department using the UPDATE SQL statement. 5. Use the query tool to execute this code, which creates the catalog_delete_department function in your hatshop database: -- Create catalog_delete_department function CREATE FUNCTION catalog_delete_department(INTEGER) RETURNS SMALLINT LANGUAGE plpgsql AS $$ DECLARE inDepartmentId ALIAS FOR $1; categoryRowsCount INTEGER; BEGIN SELECT INTO categoryRowsCount count(*)

Parse out and replace any single-line or multiline comment delimiters Identify a hard carriage return and forward it on to put_line() But the last requirement will be difficult. put_line(), our only means of displaying text from PL/SQL, will just truncate any leading spaces, so the best we can do is provide a hack where we send put_line() a tab character any time we have a source line that starts with a space character. Now that we have some requirements, let s build a text-based help tool. Listing 9-1 is the package specification for a text-based documentation formatting tool, or text-help tool appropriately named TEXT_HELP. Listing 9-1. A Package Spec to Create Text-Based Help, text_help.pks 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 create or replace PACKAGE TEXT_HELP as /* text_help.pkb by Donald J. Bales on 12/15/2006 A package to produce text-based help */ /* The help text for this package. */ PROCEDURE help;

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/* Generate help text for the specified object using its specification. */ PROCEDURE process( aiv_object_name in varchar2);

FROM category WHERE department_id = inDepartmentId; IF categoryRowsCount = 0 THEN DELETE FROM department WHERE department_id = inDepartmentId; RETURN 1; END IF; RETURN -1; END; $$; catalog_delete_department deletes an existing department from the database, but only if no categories are related to it. 6. Use the query tool to execute this code, which creates the catalog_add_department function in your hatshop database: -- Create catalog_add_department function CREATE FUNCTION catalog_add_department(VARCHAR(50), VARCHAR(1000)) RETURNS VOID LANGUAGE plpgsql AS $$ DECLARE inName ALIAS FOR $1; inDescription ALIAS FOR $2; BEGIN INSERT INTO department (name, description) VALUES (inName, inDescription); END; $$; catalog_add_department inserts a new department into the database. 7. Finally, load the admin.php page in your browser, and admire your results. Check all the buttons carefully.

/* The test unit for this package. */ PROCEDURE test;

Because the pages that administer categories and products are based on the same steps and concepts as the departments admin page, we ll quickly list the steps you need to follow. As you saw earlier, when clicking the Edit Categories button in the departments page, you get the list of categories for that department. In the categories page, clicking an Edit Products button brings up the list of products for the selected category (see Figure 7-10).

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