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I m a good primate. I hope you are, too! Primates, especially humans, are very good at creating their own tools. To that end, I ve created a testing tool that helps me code my PL/SQL test units. I have two high-level requirements for this testing tool: Provide a set of constants that I can use for column values when testing Provide a set of methods that I can use to save tests and results for later analysis Do you recall that in the SQL Test Patterns section, I stated that you first need to decide on an acceptable set of values to use during the INSERT How do you go about that Well here s how I do it: I ask the database! Listing 8-1 is a SQL*Plus query I run to determine the varchar2 lengths that are in common use. For the most part, there should only be a few. While in the past, the lengths of character field may have had some meaning, they no longer do. With the advent of globalization, the lengths of character fields only amount to specifying an upper limit on the amount of storage you re willing to use for a given string value.

Single Item Purchases is a PayPal feature that allows you to send the visitor directly to a payment page instead of the PayPal shopping cart. The PayPal shopping cart will become useless in 8, where you ll create your own shopping cart. In 9, you ll implement the Place Order button in the shopping cart, which saves the order into the database and forwards to a PayPal payment page. To call the PayPal payment page (bypassing the PayPal shopping cart), you redirect to a link like the following: https://www.paypal.com/xclick/business=youremail@example.com&item_name=Order 123 &item_number=123&amount=123¤cy=USD&return=www.example.com &cancel_return=www.example.com Review the PayPal Website Payments Standard Integration Guide for more details about the service.

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Listing 8-1. A Query to Determine Commonly Used Lengths for Varchar2 Columns, data_length_histogram.sql 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 30 31 32 33 34 35 36 37 38 39 rem data_length_histogram.sql rem by Donald J. Bales on 12/15/2006 rem Create a histogram of VARCHAR2 data lengths in use column data_type format a13; set set set set linesize newpage pagesize trimspool 1000; 1; 32767; on;

When you implement the PayPal Single Item Purchases in 9, you ll use code that looks like the following code snippet to create the URL of the PayPal Single Item Purchases page: // Calculate the total amount for the shopping cart $this->mTotalAmount = ShoppingCart::GetTotalAmount();

SEARCH(find_txt, within_txt, Start_num)

spool data_length_histogram.txt; select column_name, min(data_length) min, avg(data_length) avg, max(data_length) max, count(1) occurs from SYS.ALL_TAB_COLUMNS where owner = USER and data_type like 'VARCHAR%' and table_name not in ( 'AUTHOR', 'AUTHOR_PUBLICATION', 'A_THRU_Z', 'DEBUG_OT', 'DEBUG_T', 'PLAN_TABLE', 'PLSQL_PROFILER_RUNS', 'PLSQL_PROFILER_UNITS', 'PLSQL_PROFILER_DATA', 'TOP_100_FIRST_NAME', 'TOP_100_LAST_NAME' ) group by column_name order by max(data_length), column_name / spool off;

// If the Place Order button was clicked ... if(isset ($_POST['place_order'])) { // Create the order and get the order ID $order_id = ShoppingCart::CreateOrder(); // This will contain the PayPal link $redirect = 'https://www.paypal.com/xclick/business=youremail@example.com' . '&item_name=HatShop Order ' . $order_id . '&item_number=' . $order_id . '&amount=' . $this->mTotalAmount . '¤cy=USD&return=www.example.com' . '&cancel_return=www.example.com'; // Redirection to the payment page header('Location: ' . $redirect); exit; } You ll learn how to work with this feature in 9.

And here s the output from the query in Listing 8-1: COLUMN_NAME MIN AVG MAX OCCURS ------------------------------ ---------- ---------- ---------- ---------LOGICAL_INDICATOR 1 1 1 1 PHYSICAL_INDICATOR 1 1 1 1 CAS_NUMBER 30 30 30 1 CODE 30 30 30 10 EXTERNAL_ID 30 30 30 2 FIRST_NAME 30 30 30 2 INSERT_USER 30 30 30 1 LAST_NAME 30 30 30 2 MIDDLE_NAME 30 30 30 2 TEST 30 30 30 1 DESCRIPTION 80 80 80 7 ID_CONTEXT 100 100 100 2 NAME 80 85.7142857 100 7 TITLE 100 100 100 1 NARRATIVE 2000 2000 2000 1 15 rows selected. Analyzing this output, I have concluded that I will need the following constants for testing: A TRUE value for the indicator variables A FALSE value for the indicator variables A 30-character code value that I can specify anytime I test inserting a new code or partial name value into a code or content table An 80-character description value that I can specify anytime I test inserting a new description into a code or content table A 100-character value that I can specify anytime I test inserting a new ID context or title into a content or intersection table A 2,000-character value that I can specify anytime I test inserting a new comment or narrative into a content table I ll keep this list of requirements in mind when I code my testing tool s package specification, so the constants will be accessible to all other program units, and therefore available when writing their test units.

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