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Database Management System
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Continue ReadingUnit 6: Transaction Management
ACID Properties in DBMS A transaction is a single logical unit of work which accesses and possibly modifies the contents of a database. Transactions access data using read and write operations. In order to maintain consistency in a database, before and after transaction, certain properties are followed. These are called ACID properties. Atomicity By this, […]
Continue ReadingNormalization
First Normal Form (1NF) Each column is unique in 1NF. As per the rule of first normal form, an attribute (column) of a table cannot hold multiple values. It should hold only atomic values. Example: 1 Sample Employee table, it displays employees are working with multiple departments. Employee Age Department Melvin 32 Marketing, Sales Edward […]
Continue ReadingUnit 10: Working with Files
What is a File? A file is simply a resource for storing information on a computer. Files are usually used to store information such as; Configuration settings of a program Simple data such as contact names against the phone numbers. Images, Pictures, Photos, etc. Opening a File The fopen() function is used to open files […]
Continue ReadingUnit 6: Making Web Forms
PHP Form Handling The most important thing to notice when dealing with HTML forms and PHP is that any form element in an HTML page will automatically be available to your PHP scripts. Example The example below contains an HTML form with two input fields and a submit button:
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<html> <body><form action="welcome.php" method="post"> Name: <input type="text" name="name"><br> E-mail: <input type="text" name="email"><br> <input type="submit"> </form></body> </html> |
When a user fills out […]
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