AJAX and PHP

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Server-Side Techniques with PHP and MySQLEach column has a data type, which describes its size and behavior. There are three importantcategories of data types (numerical types, character and string types, and date and time types),and each category contains many data types. For complete details on this subject refer to theofficial MySQL 5 documentation at http://dev.mysql.com/doc/refman/5.0/en/data-types.html.When creating a new data table you must decide which values are mandatory, and mark them withthe NOT NULL property, which says the column isn't allowed to store NULL values. Thedefinition of NULL is undefined. When reading the contents of the table you see NULL, it means avalue has not been specified for that field. Note that an empty string, or a string containing spaces,or a value of "0" (for numerical columns) are real (non-NULL) values. The primary key field can'tallow NULLs.Sometimes instead of (or complementary to) disallowing NULLs for a certain field, you may wantto specify a default value. In that case, when a new record is created, if a value isn't specified forthat field, the default value will be used. For the default value you can also specify a function thatwill be executed to retrieve the value when needed.A different way of letting the system generate values for you is by using auto_increment columns.This is an option you will often use for primary key columns, which represent IDs that you prefer tobe auto-generated for you. You can set auto_increment only for numerical columns, and the newlygenerated values will be automatically incremented so no value will be generated twice.Indexes are database objects used to improve the performance of database operations. An index isa structure that greatly improves searches on the field (or fields) it is set on, but it slows down theupdate and insert operations (because the index must be updated as well on these operations). Awell-chosen combination of indexes can make a huge difference in the speed of your application. Inthe examples in this book, we will rely on the indexes that we build on the primary key columns.You can create data tables using SQL code, or using a visual interface. Here's an example of aSQL command that creates a simple data table:CREATE TABLE users(user_id INT UNSIGNED NOT NULL AUTO_INCREMENT,user_name VARCHAR(32) NOT NULL,PRIMARY KEY (user_id));In case you don't like how you created the table, you have the option to alter it using ALTER TABLE,or to drop (delete) it altogether using DROP TABLE. You can use TRUNCATE TABLE to rapidly dropand recreate the table (it has the same effect as deleting all the records, but it's much faster andalso clears the auto-increment index).For each exercise, we will give you the SQL code that builds the necessary data tables. You canexecute this code by using a program such as phpMyAdmin (Appendix A describes theinstallation procedure). To execute SQL code using phpMyAdmin, you need to connect to adatabase by selecting its name in the Database list, and clicking the SQL tab on the main panel, asshown in Figure 3.17.102
Chapter 3Figure 3.17: Executing SQL Code Using phpMyAdminphpMyAdmin also gives you the possibility to create the tables visually, using forms as shown inFigure 3.18.Figure 3.18: Creating a New Table Using the phpMyAdmin Designer103
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AJAX and PHPBuilding Responsive Web
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CreditsAuthorsCristian DarieBrinzar
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Filip Cherecheş-Toşa is a web dev
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Table of ContentsPreface 1Chapter 1
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Table of ContentsPreparing Your *ni
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PrefaceWhat This Book CoversChapter
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PrefaceAny command-line input and o
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O}EN PORTADAEl aborto...más allá
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Chapter 1Because end-user satisfact
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Chapter 1Three points for you to ke
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Chapter 1With JavaScript, developer
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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 1done typing. (This method
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Chapter 1All exercises from this bo
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etrieve the user name$name = $_GET[
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Chapter 1If you're curious to test
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AJAX and the Future of Web Applicat
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Client-Side Techniques with Smarter
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Chapter 2font-size: 10pt;}.TableCon
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Chapter 2Creating the XMLHttpReques
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Chapter 2You could, for example, ch
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You will learn the most interesting
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Chapter 2The safer version of proce
Page 61 and 62: Chapter 24. Create a file called as
Page 63 and 64: Chapter 2Figure 2.6: The Four HTTP
Page 65 and 66: Chapter 2}}else{// display status m
Page 67 and 68: Chapter 2}{// try to create XMLHttp
Page 69 and 70: Chapter 2The responseXML method of
Page 71 and 72: Chapter 2Figure 2.10: Opera Display
Page 73 and 74: I admit that the following piece of
Page 75 and 76: 3Server-Side Techniqueswith PHP and
Page 77 and 78: Chapter 3}for (var i=0; i
Page 79 and 80: Chapter 3// create the element$boo
Page 81 and 82: Chapter 3// create the root elemen
Page 83 and 84: Chapter 3// read a file from the se
Page 85 and 86: Chapter 3Figure 3.3: PHP Parameters
Page 87 and 88: Chapter 3Without the customized err
Page 89 and 90: }}// display the error in case of f
Page 91 and 92: Chapter 3Figure 3.7: Connecting to
Page 93 and 94: Chapter 3}}// continue only if HTTP
Page 95 and 96: Chapter 3You can make Firefox liste
Page 97 and 98: Chapter 3}"MSXML2.XMLHTTP.4.0","MSX
Page 99 and 100: 'TEXT: ' . $errStr . chr(10) .'LOCA
Page 101 and 102: etrieve the parameters$num = 1; //
Page 103 and 104: Chapter 3Figure 3.16: Flowchart Des
Page 105 and 106: }Chapter 3// only continue if xmlHt
Page 107 and 108: }throw(response.length == 0 ? "Serv
Page 109 and 110: function process(){// ...if (reques
Page 111: Chapter 3Working with MySQLA back-e
Page 115 and 116: Chapter 3SELECT user_id, user_name
Page 117 and 118: 3. In your foundations folder, crea
Page 119 and 120: Chapter 3After these commands execu
Page 121 and 122: Chapter 3• friendly.php is a PHP
Page 123 and 124: This example requires a JavaScript-
Page 125 and 126: }}// try to connect to the servertr
Page 127 and 128: Chapter 3}// create HTML-formatted
Page 129: Chapter 3On the server side, all th
Page 132 and 133: AJAX Form ValidationThe code in thi
Page 134 and 135: AJAX Form ValidationFigure 4.2: The
Page 136 and 137: AJAX Form ValidationNote that deali
Page 138 and 139: AJAX Form Validation"3" => "March",
Page 140 and 141: AJAX Form Validationclass="">Please
Page 142 and 143: AJAX Form Validation}}alert("Error
Page 144 and 145: AJAX Form Validation// output the e
Page 146 and 147: AJAX Form Validationbreak;}}// Chec
Page 148 and 149: AJAX Form Validationprivate functio
Page 150 and 151: AJAX Form ValidationThe onblur even
Page 152 and 153: AJAX Form ValidationAfter this basi
Page 154 and 155: AJAX Form ValidationSummaryWhile we
Page 156 and 157: AJAX ChatFigure 5.1: MeeboMeebo off
Page 158 and 159: AJAX ChatThe messages for the AJAX
Page 160 and 161: AJAX Chat// destructor closes datab
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AJAX Chat}}?>8. Create another file
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AJAX Chat/* creates an XMLHttpReque
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AJAX Chat}}xmlHttpGetMessages.send(
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AJAX Chatfunction handleKey(e){// g
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AJAX Chat12. After having talked ab
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AJAX ChatOn pressing the Send butto
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AJAX ChatSummaryAt the beginning of
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AJAX Suggest and AutocompleteIt's a
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AJAX Suggest and AutocompleteTime f
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AJAX Suggest and Autocomplete170'FR
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AJAX Suggest and Autocomplete10. Cr
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AJAX Suggest and Autocomplete}if(ca
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AJAX Suggest and Autocomplete}if(re
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AJAX Suggest and Autocomplete}var k
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AJAX Suggest and AutocompletecrtLin
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AJAX Suggest and AutocompleteFigure
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AJAX Suggest and Autocompletewant c
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AJAX Suggest and AutocompleteNext,
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AJAX Suggest and Autocompletein sug
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AJAX Real-Time Charting with SVGFor
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AJAX Real-Time Charting with SVG0.0
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AJAX Real-Time Charting with SVG3.
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AJAX Real-Time Charting with SVG//
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AJAX Real-Time Charting with SVG//
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AJAX Real-Time Charting with SVGcoo
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AJAX Real-Time Charting with SVG•
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AJAX GridImplementing the AJAX Grid
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AJAX GridCREATE TABLE product(produ
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AJAX Grid}// execute the queryif ($
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AJAX Grid// clear any output that h
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AJAX Grid212// the id of the grid d
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AJAX Grid// handle receiving the se
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AJAX Grid// handle receiving a resp
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AJAX GridAs usual on the server, we
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AJAX Grid220}{}stylesheetDoc = crea
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9AJAX RSS ReaderIn the last few yea
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Chapter 9Figure 9.1: Managing RSS S
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header('Pragma: no-cache');header('
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Chapter 9Loading feed...About the A
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Chapter 9}// continue if the proces
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Chapter 9}width: 410px;background-c
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And finally, we send the HTTP reque
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10AJAX Drag and DropWhen drag-and-d
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Chapter 10The Prototype features ar
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Chapter 10When dropping a task on t
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Chapter 10DROP HERE TO DELETE7. Cre
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header('Expires: Fri, 25 Dec 1980 0
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Chapter 10}}}else if (action =="del
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Chapter 1011. Load http://localhost
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details are saved using a cache sys
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Chapter 10SummaryThis is it! You've
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Preparing Your Working EnvironmentT
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Preparing Your Working EnvironmentA
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Preparing Your Working Environment1
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Preparing Your Working EnvironmentA
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Preparing Your Working Environment6
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IndexAabort() method, XMLHttpReques
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exception handling, JavaScript, 43
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PHP Parameters and Error Handlingre
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updateChart() function, realTimeCha
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