NMED 3850 A Advanced Online Design January 14, 2010 V. Mahadevan

SQL Data Types Various kinds of data can be stored in a relational database. Each data item has a particular type. Examples: INT: integers CHAR: alphanumeric characters (up to 30) VARCHAR: alphanumeric characters (up to 255) FLOAT: real numbers DATE: YYYY-MM-DD DATETIME: YYYY-MM-DD HH:mm:SS

SQL Data Types (cont.) CREATE TABLE Person (person_id INT, last_name VARCHAR(20), first_name VARCHAR(20), age INT, bday DATE); INSERT INTO Person VALUES (1, 'Smith', 'Bob', 30, ' ');

SQL Data Types (cont.) Some useful MySQL date functions: CURDATE(): returns the current date NOW(): returns the current date and time CREATE TABLE Datetest (the_date DATE, the_date_time DATETIME); INSERT INTO Datetest VALUES (CURDATE(), NOW()); CURDATE(): returns the current date. NOW(): returns the current date and time.

SQL Data Types (cont.) Date types can be compared using SQL: SELECT * FROM Person WHERE bday > ‘ ’; This is a very powerful feature.

First Web Form Last Name: First Name: Age:

First PHP Script You entered Last Name: You entered First Name: You entered Age: ………

Inserting Data into MySQL <?php $hostname = 'localhost'; $username = 'newmedia'; $password = 'newmedia'; $connection = mysql_connect($hostname, $username, $password) or die ('Connection error!!!'); $database = 'peopledb'; mysql_select_db($database); $lastname = $_POST["last_name"]; $firstname = $_POST["first_name"]; $age = (int)$_POST["age"];

Inserting Data into MySQL (cont.) print " Inserted the following data into the MySQL Database: "; print " Last Name: $lastname "; print " First Name: $firstname "; print " Age: $age "; $execute_statement = "INSERT INTO person(last_name, first_name, age) VALUES ('$lastname', '$firstname', '$age')"; mysql_query($execute_statement) or die ('Error executing SQL statement!!!'); ?>

Retrieving Data from MySQL $lastname = $_POST["last_name"]; print " Retrieved the following data from the MySQL Database based on last name = $lastname: "; $execute_statement = "SELECT * FROM person WHERE last_name='$lastname'"; $results = mysql_query($execute_statement) or die ('Error executing SQL statement!!!'); while($item = mysql_fetch_array($results)) { print $item['last_name']; print " "; print $item['first_name']; print " "; print $item['age']; print " "; }

Updating Data in MySQL $oldlastname = $_POST["old_last_name"]; $newlastname = $_POST["new_last_name"]; print " Updated oldlastname = $oldlastname to newlastname = $newlastname : "; $execute_statement = "UPDATE person SET last_name = '$newlastname' WHERE last_name='$oldlastname'"; mysql_query($execute_statement) or die ('Error executing SQL statement!!!');

Deleting Data from MySQL $lastname = $_POST["last_name"]; print " Deleted lastname = $lastname from database "; $execute_statement = "DELETE FROM person WHERE last_name = '$lastname'"; mysql_query($execute_statement) or die ('Error executing SQL statement!!!');

References  MySQL 5.0 Reference Manual:  PHP Manual: