Php modul-3

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  • 1. PHP TUTORIAL PHP and Database
  • 2. What is Database? ● A database is an organized collection of data. ● The data collection are typically organized to model relevant aspects of reality in a way that supports processes requiring this information
  • 3. What is Database Management System? ● Database management systems (DBMSs) are specially designed applications that interact with the user, other applications, and the database itself to capture and analyze data. ● A general-purpose database management system (DBMS) is a software system designed to allow the definition, creation, querying, update, and administration of databases.
  • 4. Why use database? ● Databases are most useful when it comes to storing information that fits into logical categories. ● Example: store employees record – Supervisors table, managers tables, suppliers table, etc.
  • 5. Why MySQL? ● The most popular database system used with PHP. ● PHP combined with MySQL are cross-platform (you can develop in Windows and serve on a Unix platform) ● Most web hosts do not allow you to create a database directly through a PHP script. ● Instead they require that you use the PHP/MySQL administration tools on the web host control panel to create these databases
  • 6. What is “Queries” ● A query is a question or a request. ● We can query a database for specific information and have a recordset returned ● Example: – SELECT * FROM customers;
  • 7. How to learn SQL ● Remember this: – SQL language is not complicated ● There are many keywords in MySQL, and a good programming habit when using ANY of these words is to capitalize them. ● This helps draw them out from the rest of the code and makes them much easier to read. ● Example: – SELECT * FROM example
  • 8. SQL Basic Command ● Create Database – CREATE DATABASE <database_name> ● Use Database – Use <database_name> ● Create Table – CREATE TABLE <table_name> (col1 type1, col2 type2, … , colx typex) ● Example – CREATE DATABASE exercise; – Use exercise; – CREATE TABLE student (name varchar(30), age INT);
  • 9. SQL Basic Command ● Insert data to table – INSERT INTO <table_name> (col1,col2, … , colx) VALUES (val1, val2, … , valx); – Example: ● INSERT INTO student VALUES ('William',27); ● Query data from table – SELECT <colx| *> FROM <table_name> WHERE <expression> – Example: ● SELECT name FROM student WHERE age>20;
  • 10. SQL Basic Command ● Edit data – UPDATE <table_name> SET <colx=valx> WHERE <expression> ● Delete data – DELETE FROM <table_name> WHERE <expression> ● Example – UPDATE student SET age=30 WHERE name='William'; – DELETE FROM student WHERE name='William';
  • 11. PHP Form Handling ● Use $_GET or $_POST to handle the data from the form ● Example (form_get.html) <html> <body> <form action="helloget.php" method="get"> Name: <input type="text" name="name"><br> <input type="submit"> </form> </body> </html>
  • 12. PHP Form Handling ● Helloget.php <html> <body> Welcome <?php echo $_GET["name"]; ?> </body> </html>
  • 13. PHP Form Handling ● (form_post.html) <html> <body> <form action="hellopost.php" method="post"> Name: <input type="text" name="name"><br> <input type="submit"> </form> </body> </html>
  • 14. PHP Form Handling ● Hellopost.php <html> <body> Welcome <?php echo $_POST["name"]; ?> </body> </html>
  • 15. PHP Form Handling ● GET vs. POST – $_GET is an array of variables passed to the current script via the URL parameters. – $_POST is an array of variables passed to the current script via the HTTP POST method.
  • 16. PHP Form Handling ● When we use GET method? – Remember this : Information sent from a form with the GET method is visible to everyone (in address bar). – GET has limits on the amount of information to send (only 2000 character). – ONLY USED for sending non-sensitive data. – Never use GET to send sensitive informations such as username or password
  • 17. PHP Form Handling ● When we use POST method? – Remember this : Information sent from a form with the POST method is invisible to others. – POST has no limits on the amount of information to send. – Supports advanced functionality such as multi- part binary input while uploading files to server.
  • 18. PHP & MySQL ● Open connection to MySQL – mysqli_connect(host, username, password, database_name) – Example $con=mysqli_connect(“localhost”,”root”,”1234”,”exercis e”); ● Check connection if (mysqli_connect_errno($con)) echo "Failed to connect to MySQL: " . mysqli_connect_error();
  • 19. PHP and MySQL ● Close connection – mysqli_close(connection_variable) ● Example – mysqli_close($con);
  • 20. PHP and MySQL ● Send query to MySQL – mysqli_query(<query>,<connection_variable> ); ● Example: $sql=”INSERT INTO student VALUES('John',33)”; mysqli_query($sql,$con);
  • 21. PHP and MySQL ● Retrieve result of query $sql=”SELECT * FROM student”; $result=mysqli_query($sql,$con); While ($row = mysqli_fetch_array($result)) { echo $row['name'] . “ “ . $row['age'] . “<br>”; }
  • 22. excercise ● A. Database – Use database exercise – Create a course table which have structure like this: ● id_course – varchar ● name_course – varchar ● Credit – int – Create a student table which have structure like this: ● id_student – varchar ● Firstname – varchar ● Lastname - varchar – Insert 10 data into table course and student
  • 23. excercise ● B. PHP and MySQL – Create a web application with php to handles ● The input for table course and student ● List all data for table course and student ● Search data for table course and student
  • 24. Home Works ● Create a web applications with PHP to handle the update and delete proses for table course and student