AJAX and PHP

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Server-Side Techniques with PHP and MySQL This data will be used when performing database operations. Any database operation consists of three mandatory steps: 1. Opening the database connection 2. Executing the SQL queries and reading the results 3. Closing the database connection It's a good practice to open the database connection as late as possible, and close it as soon as possible, because open database connections consume server resources. The following code snippet shows a simple PHP script that opens a connection, reads some data from the database, and closes the connection: // connect to the database $mysqli = new mysqli(DB_HOST, DB_USER, DB_PASSWORD, DB_DATABASE); // what SQL query you want executed? $query = 'SELECT user_id, user_name FROM users'; // execute the query $result = $mysqli->query($query); // do something with the results... // ... // close the input stream $result->close(); // close the database connection $mysqli->close(); Note that we use the mysqli library to access MySQL. This is a newer and improved version of the mysql library, which provides both object-oriented and procedural interfaces to MySQL, and can access more advanced features of MySQL. If you have older versions of MySQL or PHP that don't support mysqli, use mysql instead. The exercise that follows doesn't contain AJAX-specific functionality; it is just a simple example of accessing a MySQL database from PHP code. Time for Action—Working with PHP and MySQL 1. Connect to the ajax database, and create a table named users with the following code: CREATE TABLE users ( user_id INT UNSIGNED NOT NULL AUTO_INCREMENT, user_name VARCHAR(32) NOT NULL, PRIMARY KEY (user_id) ); 2. Execute the following INSERT T commands to populate your users table with some sample data: INSERT INTO users (user_name) VALUES ('bogdan'); INSERT INTO users (user_name) VALUES ('filip'); INSERT INTO users (user_name) VALUES ('mihai'); INSERT INTO users (user_name) VALUES ('emilian'); INSERT INTO users (user_name) VALUES ('paula'); INSERT INTO users (user_name) VALUES ('cristian'); Because user_id is an auto_increment column, its values will be generated by the database. 106 www.it-ebooks.info
3. In your foundations folder, create a new folder named mysql. 4. In the mysql folder, create a file named config.php, and add the database configuration code to it (change these values to match your configuration): 5. Now add the standard error-handling file, error_handler.php. Feel free to copy this file from the previous exercises: 6. Create a new file named index.php, and add this code to it: Practical AJAX: Working with PHP and MySQL
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AJAX and PHP Building Responsive We
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About the Authors Cristian Darie is
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About the Reviewers Emilian Balanes
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Table of Contents Preface 1 Chapter
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Table of Contents Chapter 6: AJAX S
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Preface AJAX is a complex phenomeno
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Preface What You Need for This Book
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Preface Errata Although we have tak
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1 AJAX and the Future of Web Applic
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Chapter 1 Because end-user satisfac
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Chapter 1 Three points for you to k
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Chapter 1 With JavaScript, develope
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interrupting the user from his or h
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• Creating simple online chat sol
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Chapter 1 done typing. (This method
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Chapter 1 All exercises from this b
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etrieve the user name $name = $_GET
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Chapter 1 If you're curious to test
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Chapter 1 request. In our case, thi
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2 Client-Side Techniques with Smart
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AJAX Foundations: JavaScript and
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Chapter 2 • Because there is no s
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Time for Action—Using JavaScript
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Even More DOM In the previous exerc
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Chapter 2 What Just Happened? Well,
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Chapter 2 font-size: 10pt; } .Table
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Chapter 2 Creating the XMLHttpReque
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Chapter 2 You could, for example, c
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You will learn the most interesting
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Chapter 2 The safer version of proc
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Chapter 2 4. Create a file call
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Chapter 2 Figure 2.6: The Four HTTP
Page 67 and 68: Chapter 2 } } else { // display sta
Page 69 and 70: Chapter 2 } { // try to create XMLH
Page 71 and 72: Chapter 2 The responseXML method of
Page 73 and 74: Chapter 2 Figure 2.10: Opera Displa
Page 75 and 76: I admit that the following piece of
Page 77 and 78: 3 Server-Side Techniques with PHP a
Page 79 and 80: Chapter 3 } for (var i=0; i
Page 81 and 82: Chapter 3 // create the element $b
Page 83 and 84: Chapter 3 // create the root eleme
Page 85 and 86: Chapter 3 // read a file from the s
Page 87 and 88: Chapter 3 Figure 3.3: PHP Parameter
Page 89 and 90: Chapter 3 Without the customized er
Page 91 and 92: } } // display the error in case of
Page 93 and 94: Chapter 3 Figure 3.7: Connecting to
Page 95 and 96: Chapter 3 } } // continue only if H
Page 97 and 98: Chapter 3 You can make Firefox list
Page 99 and 100: Chapter 3 } "MSXML2.XMLHTTP.4.0", "
Page 101 and 102: 'TEXT: ' . $errStr . chr(10) . 'LOC
Page 103 and 104: etrieve the parameters $num = 1; //
Page 105 and 106: Chapter 3 Figure 3.16: Flowchart De
Page 107 and 108: } Chapter 3 // only continue if xml
Page 109 and 110: } throw(response.length == 0 ? "Ser
Page 111 and 112: function process() { // ... if (req
Page 113 and 114: Chapter 3 Working with MySQL A back
Page 115 and 116: Chapter 3 Figure 3.17: Executing SQ
Page 117: Chapter 3 SELECT user_id, user_name
Page 121 and 122: Chapter 3 After these commands exec
Page 123 and 124: Chapter 3 • friendly.php is a PHP
Page 125 and 126: This example requires a JavaSc
Page 127 and 128: } } // try to connect to the server
Page 129 and 130: Chapter 3 } // create HTML-formatte
Page 131 and 132: Chapter 3 On the server side, all t
Page 133 and 134: 4 AJAX Form Validation Validating i
Page 135 and 136: Chapter 4 Always validate user inpu
Page 137 and 138: Chapter 4 Figure 4.4: Successful Su
Page 139 and 140: Chapter 4 .left { margin-left: 150p
Page 141 and 142: Chapter 4 value="" />
Page 143 and 144: Registration Successfull! <<
Page 145 and 146: Chapter 4 } } { // display error me
Page 147 and 148: Chapter 4 require_once ('config.php
Page 149 and 150: Chapter 4 } { } $_POST['txtBthDay']
Page 151 and 152: Chapter 4 } } ?> return ($value ==
Page 153 and 154: Chapter 4 The field ID and value re
Page 155 and 156: Chapter 4 If we are dealing with cl
Page 157 and 158: 5 AJAX Chat We are living in a worl
Page 159 and 160: Chapter 5 Implementing AJAX Chat We
Page 161 and 162: Chapter 5 // default the last id to
Page 163 and 164: } Chapter 5 ' DATE_FORMAT(posted_on
Page 165 and 166: Chapter 5 AJAX Chat Your b
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} } // retrieve the arrays from the
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Chapter 5 } } } // call server asyn
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Chapter 5 If you analyze the code f
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The business logic behind chat.php
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6 AJAX Suggest and Autocomplete Sug
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Chapter 6 The clever part of the Ja
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Chapter 6 6. Create another file na
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Chapter 6 { } a { } font-weight: bo
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Chapter 6 } { // try to create XMLH
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Chapter 6 } } } } { } displayError(
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Chapter 6 div += "" + "" + crtFunct
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} } // select the new suggestion an
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Chapter 6 } } else // FF if (oText.
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Chapter 6 Figure 6.4: PHP Documenta
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Chapter 6 We have talked about cach
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Chapter 6 visible, we need to scrol
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7 AJAX Real-Time Charting with SVG
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Chapter 7 Figure 7.1: SVG Chart The
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Chapter 7 Figure 7.2: SVG Charting
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Chapter 7 } { xmlHttp.onreadystatec
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} } // sets the X and Y attributes
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Chapter 7 } // Supported by Mozilla
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Chapter 7 • All HTTP requests go
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8 AJAX Grid Data grids have always
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Chapter 8 Figure 8.2: AJAX Grid in
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$name = $_GET['name']; // update th
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} Chapter 8 if (!isset($_SESSION['r
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Chapter 8 # editId(, true) Edit
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Chapter 8 } // this should work for
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} Chapter 8 if(editableId) editId(e
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} color: darkblue; text-align: righ
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Chapter 8 On the client, this data
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Chapter 8 save() and undo() are hel
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9 AJAX RSS Reader In the last few y
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Chapter 9 Figure 9.1: Managing RSS
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header('Pragma: no-cache'); header(
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Chapter 9 Loading feed... Abou
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Chapter 9 } // continue if the proc
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Chapter 9 } width: 410px; backgroun
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And finally, we send the HTTP reque
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10 AJAX Drag and Drop When drag-and
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Chapter 10 The Prototype features a
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Chapter 10 When dropping a task on
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Chapter 10 DROP HERE TO DELETE
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header('Expires: Fri, 25 Dec 1980 0
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Chapter 10 } } } else if (action ==
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Chapter 10 11. Load http://localhos
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details are saved using a cache sys
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Chapter 10 Summary This is it! You'
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A Preparing Your Working Environmen
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Appendix A During installation you'
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Before going through any case studi
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Appendix A Preparing Your *nix Play
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8. Finally, point your web browser
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2. Write ajax in the Create a new d
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Index A abort() method, XMLHttpRequ
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exception handling, JavaScript, 43
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PHP Parameters and Error Handling r
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updateChart() function, realTimeCha
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