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This section walks you through the steps to create the tables shown in Figure 6-1, in MySQL. Although some of these tables may already exist in the mydb database because they were used in the previous examples, you have to re-create them in the newly created dbsample database so that they can be used in the sample application. Before you can follow the SQL commands shown in Listing 6-4, you need to connect to the MySQL server through the MySQL command-line tool as the usrsample user:

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You can find the batch script shown in the listing in the downloadable archive accompanying this Tip book, specifically, in the ch6/tablesmysql.sql file. This can save you lots of time if you use this file as an input parameter of the mysql program, as discussed in the MySQL Command-Line Tool section in the appendix.

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Now that the events are being called, you sometimes need to cancel the event. For example, if you are doing form validation and the user has entered invalid data, you need to be able to tell the browser to stop the form from submitting. Let s take another look at the passcode example: var passcode = document.getElementById("passcode"); passcode.regexp = /^[0-9]+$/; document.getElementById("frm").onsubmit = function(){ var passcode = document.getElementById("passcode"); if(!passcode.regexp.test(passcode.value)) { alert('Not a valid passcode'); return false; } } You re not using the event listener approach here; instead, you attached the event handler directly to the element. When you attach it directly to the element, you can return false to cancel the default behavior of the element. In other words, if you attached an event handler to a link, you could prevent the link from being followed and (as in the passcode example) prevent the form from submitting. When you use event listeners, you can t cancel the behavior in this way. However, the DOM event object gives you a way around this: preventDefault(). Let s rewrite the passcode example to use event listeners: var passcode = document.getElementById("passcode"); passcode.regexp = /^[0-9]+$/; function isPasscodeValid(evt) { var passcode = document.getElementById("passcode"); if(!passcode.regexp.test(passcode.value)) { alert('Not a valid passcode'); evt.preventDefault(); } } addListener(document.getElementById("frm"), 'submit', isPasscodeValid); Notice that the function is expecting a parameter. The DOM actually passes in the event object as the first parameter, which is declared as evt. An event object stores various properties and methods about the event, such as what type of event, which mouse button was pressed (or which keys on the keyboard were pressed if it s a keyboard event), and what the target element is.

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Figure 5-3. The New books database page You may notice that the books database has been added to the Recent Databases list. Also, notice that in the heading bar in the main section of Futon, alongside Overview you have an arrow and the name of the database. Also notice that the text Overview is now clickable. This will bring you back to the Futon start page. On the right side of the heading bar, you will notice a small gray shape that looks like a signpost. This is a link to the raw view of the database, showing the JSON code that it is made up of. Click that link now to view what the raw code looks like.

Listing 6-4. Creating the Tables That Will Be Used in the Sample, in MySQL USE usrsample; DROP TABLE IF EXISTS DROP TABLE IF EXISTS DROP TABLE IF EXISTS DROP TABLE IF EXISTS DROP TABLE IF EXISTS DROP TABLE IF EXISTS DROP TABLE IF EXISTS details; shoppingCarts; orders; customers; locations; employees; books;

CREATE TABLE locations ( loc_id INTEGER PRIMARY KEY, area VARCHAR(100) ) ENGINE = InnoDB; CREATE TABLE customers ( cust_id INTEGER PRIMARY KEY, cust_name VARCHAR(100), loc_id INTEGER, email VARCHAR(100), phone VARCHAR(20), FOREIGN KEY(loc_id) REFERENCES locations(loc_id) ) ENGINE = InnoDB; CREATE TABLE employees( empno INTEGER PRIMARY KEY, firstname VARCHAR(30), lastname VARCHAR(30) ) ENGINE = InnoDB;

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