Other Language Types. CMSC 330: Organization of Programming Languages. History of Markup Languages. Markup Languages
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1 CMSC 330: Organization of Programming Languages Markup & Query Languages Other Language Types Markup languages Set of annotations to text Query languages Make queries to databases & information systems Used together in Web interface to databases CMSC Markup Languages Set of annotations (tags) added to text <tag> text </tag> Describe how text is Structured, laid out, formatted First used in publishing industry Typesetting, proofreading nroff, troff, TeX, LaTeX Mostly replaced by WYSIWYG editors like MS Word What you see is what you get Regained importance with advent of web Used to describe format & presentation of web pages History of Markup Languages GML (1960s) Generalized markup language Describe both structure & presentation of content HTML (1991) Hypertext markup language Flexible & simple descriptive markup for web pages Hypertext links parts of document to other documents CMSC CMSC History of Markup Languages (cont.) XML (1998) Extensible markup language Language for describing tags (meta-language) User can create tags and describe their uses Used to describe documents w/ structured information No mechanism for displaying XML document Markup Language GML :h1.recipes: :p.bread :ol :li.flour :li.yeast :li.water :eol. CMSC CMSC
2 Markup Language HTML <html> <head><title>bread Recipe</title></head> <body> <h1>bread</h1> <ol> <li>flour <li>yeast <li>water </ol> </body> </html> CMSC Markup Language XML <recipe name= Bread > <title>bread</title> <ingredient>flour </ingredient> <ingredient>yeast</ingredient> <ingredient>water</ingredient> </recipe> CMSC HTML / XML Elements Element A start tag, an end tag, and data in between s <director> Tyler Perry </director> <actor> Tyler Perry </actor> Attribute A name-value pair separated by an equal sign (=) Used to attach additional information to an element <city ZIP= > College Park </city> HTML Elements Structural Describes purpose of text s <h1> Level 1 heading <h1> <ol> Ordered list </ol> <ul> Unordered list </ul> <li> List item </li> CMSC CMSC HTML Elements (cont.) Presentation Describes appearance of text s <b> boldface </b> <i> italics </i> <p> line spacing </p> Hypertext Links part of document to other documents s <a> Anchor </a> <a href= > URL link </a> XML Document An XML element with nested XML elements <movies> <movie year= 2005 > <title> Diary of a Mad Black Woman </title> <director> Tyler Perry </director> </movie> <movie year= 2006 > <title> Madea's Family Reunion </title> <director> Tyler Perry </director> </movie> </movies> CMSC CMSC
3 XML Documents (cont.) Comparing HTML With XML Guidelines Elements must have an end tag (unlike HTML) Elements must be cleanly nested Overlapping elements are not allowed Attribute values must be enclosed in quotation marks Document must have unique first element (root node) HTML Fixed set of tags Presentation oriented No data validation capabilities Single presentation XML Extensible set of tags Content oriented Standard Data infrastructure Multiple output forms Document Type Definition (DTD) User can create set of rules to specify legal content Place restrictions on XML file CMSC CMSC Using Markup Languages Descriptive markup Structure How is this organized? (<chapter>, <section>) Semantics What is this? (<person>, <title>) Separate presentation from content Keep presentation elsewhere (CSS, XSL) Puts content in delivery neutral format <h1> is a first level heading, but can be any font Markup Language Usage Started with documents Now also used to organize Metadata Data about data, used to help understand / manage data : <LastName optional= true > Smith </LastName> Transactions Single unit of work for application Applications Helping applications interact / work together CMSC CMSC Query Languages Make queries to Databases Information systems Goals Data retrieval Data management s SQL (1970s) Query relational databases LDAP (1993) Query directory services for TCP/IP Databases (DB) A structured collection of data (records) Whose content can be quickly and easily Accessed, managed, updated Database model Hierarchical Records are stored in a tree Network Records have links to other records Relational Records are stored in tables (relations) CMSC CMSC
4 Tables (Relations) Each column constitutes an attribute Each row constitutes a record or tuple Record 1 (tuple 1) Record 2 (tuple 2) Attribute 1 (column 1) Attribute 2 (column 2) Record 1 Record 2 Record 3 Major Computer Engineering Computer Programming Biology 2007 Starting Salary $56K $45K $37K SQL (Structured Query Language) Queries for relational database systems Allows for complete Table creation, deletion, editing Data extraction (queries) Database management & administration CMSC CMSC SQL Creating Database Types of attributes char, varchar, int,, decimal, date, etc. varchar is a string with varying # of chars Not Null Each record must have value Primary key Must be unique for each record CREATE TABLE tablename ( name VARCHAR(55), sex CHAR(1) NOT NULL, age INT(3), birthdate DATE, primary key(name) ); SQL Creating Database (cont.) Primary key CREATE TABLE tablename ( Can use name VARCHAR(55), autoincremented sex CHAR(1) NOT NULL, numbers as primary key age INT(3), Guaranteed to be birthdate DATE, unique id INT AUTO_INCREMENT, 1 st entry key = 1 primary key(id) 2 nd entry key = 2, etc ); CMSC CMSC SQL Inserting Values INSERT INTO tablename (name, sex, age) VALUES ( Bob, M, 42); INSERT INTO tablename (age, name, sex,) VALUES (42, Bob, M ); Identical result Order of fields do not matter SQL Updating Values Operations in the form Select From Where Means Select a column From a database Where x meets y condition UPDATE tablename SET age = 52 WHERE name LIKE Bob CMSC CMSC
5 Database Server Accepts requests to access database Requests in query language (e.g., SQL) MySQL Multithreaded Multiuser SQL database management system (DBMS) Open source Free download of Community Edition Database Web Interface Requires Database server (MySQL) Web server (Apache) Method of connecting two (scripts) CGI, Javascript, PHP, Ruby on Rails CMSC CMSC PHP PHP: Hypertext Preprocessor Scripting language Designed to produce web pages Can also be used from command line, in GUIs Characteristics Paradigm Imperative, object-oriented Type system Dynamic, weak Application domain Server side scripting CMSC Server-side Scripting Steps 1. Browser requests PHP document from server 2. Server reads the PHP document and Runs the PHP code Generates HTML document Returns HTML document to browser 3. Browser displays HTML document Server must support PHP processing Other server-side scripting languages ASP.NET, JavaServer Pages, mod_perl, eruby CMSC PHP Documents PHP document Filename ends in.php or.phtml PHP code enclosed in (non-html) tags <?php PHP code?> <script language="php"> PHP code </script> Everything outside of PHP tags is unchanged Usually standard HTML PHP output is standard HTML document PHP Document test.php <html> <head><title>php Test</title></head> <body> <?php echo <p>hello World</p> ;?> </body> </html> CMSC CMSC
6 PHP Document 2 test2.php <?php function hello() { return 'Hello'; } function world() { return "World!\n"; } $fn1 = 'hello'; $fn2 = 'world'; echo $fn1(). ' '. $fn2();?> PHP Document 3 regrade.html <form method="post" action=" .php"> <input name=" " type="text" /><br /> Message:<br /> <textarea name="message" rows="15" cols="40"> </textarea><br /> <input type="submit" /> </form> CMSC CMSC PHP Document 3 (cont.) me.php <?php $ = $_REQUEST[' '] ; $message = $_REQUEST['message'] ; mail("cmsc330@cs.umd.edu", "Regrade Request", $message, "From: $ " ); header( Please Regrade" );?> PHP Functions Connect to database server mysql_connect($hostname, $username, $password) or die("unable to connect to host $hostname"); Modify database mysql_select_db($dbname) or die("unable to select database $dbname"); Disconnect from database server mysql_close(); CMSC CMSC Manage Tables Through Queries Basic information searches $SQL = "SELECT FirstName, LastName, DOB, Gender FROM Patients WHERE Gender = '$Gender' ORDER BY FirstName DESC"; $Patients = mysql_query($sql); Editing, adding, and deleting records and tables $SQL = "INSERT INTO Patients (FirstName, LastName) VALUES('$firstName', '$lastname')"; $Patients = mysql_query($sql); Potential problem SQL Injection Users may inject malicious commands to query Through intentionally misformed fields Query code $SQL = "SELECT WHERE Gender = '$Gender' "; $Patients = mysql_query($sql); User enters for Gender M'; DROP TABLE Patients; instead of M Query becomes mysql_query ("SELECT WHERE Gender = 'M'; DROP TABLE patients; "; Causing patient database to be deleted! Prevention User input must be filtered / escaped / parameterized CMSC CMSC
7 Ruby On Rails Web application development framework Written in Ruby Supports web database applications Uses Javascript libraries, AJAX for GUI Model-view-controller model Used to organize web DB applications Separates database from GUI Generates scaffolding code Scripts generate code from specifications Gets web database up and running quickly CMSC Rails 2.0 Demo Build a TODO list Install Rails (or use InstantRails Ruby+Rails+Apache+MySQL) gem install rails --include-dependencies Create Rails application rails todo Creates directory structure & files for todo application cd todo Generate database & scaffolding ruby script/generate scaffold Todo task:string desc:text Creates model-view-controller scaffold code for todo list Specifies SQL database named todo with 2 columns (task & desc) rake db:migrate Creates Table todo in database described in todo/config/database.yml Start built-in Rails web server ruby /script/server Web database up & running at CMSC AJAX Asynchronous JavaScript and XML Group of interrelated web development techniques Used for creating interactive web application Can update portions of page without browser refresh Retrieves data using XMLHttpRequest from browser s Google Maps Gmail Flickr eruby Rails uses eruby Template system to embed Ruby in text document Needs interpreter to process eruby and output html Filename ends in.rhtml or.erb eruby tags <% Ruby code %> % Ruby code <%= Ruby expression %> Evaluates expression and replaces with result : <%= 2+3 %> 5 CMSC CMSC eruby s Generate 3 list items <ul> <% 3.times do %> <li>list item</li> <% end %> </ul> Alternative version <ul> % 3.times do <li>list item</li> % end </ul> Return current time <p>date: <%= Time.now %> </p> CMSC
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