Introduction to php database connectivity
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This document discusses connecting PHP to MySQL databases. It provides code examples for connecting to a MySQL server, selecting a database, executing queries, and retrieving data. It demonstrates how to insert form data submitted via POST into a MySQL table using PHP. It also shows different MySQL functions for retrieving data like mysql_fetch_array(), mysql_fetch_assoc(), mysql_fetch_row(), and mysql_fetch_object(). The document ends by explaining how to use mysql_num_rows() to get the number of rows returned by a query.
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Introduction to php database connectivity
- 1. PHP – Mysql connectivity
- 2. How to connect PHP with MySQL 1. Connecting to MySQL Server • mysql_connect(‘host_name’,’username’,’password’); 2. Selecting Database • mysql_select_db(‘Database Name’); 3. Query execution • mysql_query(‚query to be executed‛);
- 4. Example Program <html> <body> <form action=‛registration.php‛ method=POST> <input type=‚text‛ name=‚name‛> <input type=‚text‛ name=‚email‛> </form> </body> </html>
- 5. Registration.php will look like this <?PHP $name = $_POST['name']; $email = $_POST['email']; mysql_connect("localhost","root",""); mysql_select_db("test2"); mysql_query ("insert into tbl_user(vchr_name,vchr_email) values ('$name','$email')"); echo "succesfully inserted‚; ?>
- 6. Retrieving data from mysql • There are 4 ways we can retrieve data from mysql tables Mysql_fetch_array() Mysql_fetch_row() Mysql_fetch_assoc() Mysql_fetch_object() • All of the above will return one row from table at a time and then the next row and so on . So usually we use these functions along with a while loop
- 7. Retrieving data from mysql – mysql_fetch_assoc() $query = mysql_query (‚select * from tbl_customer"); while($fetch=mysql_fetch_assoc($query)) { echo $fetch*‘name’+; echo $fetch*‘vchr_email’+; }
- 8. Retrieving data from mysql – mysql_fetch_row() $query = mysql_query (‚select * from tbl_customer"); while($fetch=mysql_fetch_array($query)) { echo $fetch[0]; //prints first column the retrieved row echo $fetch[1]; //prints second column the retrieved row }
- 9. Retrieving data from mysql – mysql_fetch_array() $query = mysql_query (‚select * from tbl_customer"); while($fetch=mysql_fetch_array($query)) { echo $fetch[0]; //prints first column the retrieved row. Ie name echo $fetch[1]; //prints second column the retrieved row. Ie email echo $fetch*‘name’+; //prints first column the retrieved row echo $fetch*‘email’+; //prints second column the retrieved row } ‚Mysql_fetch_array() is a combination of mysql_fetch_assoc() and mysql_fetch_row()‛
- 10. Retrieving data from mysql – mysql_fetch_object() $query = mysql_query (‚select * from tbl_customer"); while($fetch=mysql_fetch_array($query)) { echo $fetch->name; //prints first column the retrieved row echo $fetch->email; //prints second column the retrieved row } ‚Returns an object with properties that correspond to the fetched row and moves the internal data pointer ahead.‛
- 11. Mysql_num_rows() • PHP provides another utility inbuilt function mysql_num_rows() which will return the number of rows returned from the executed query – Example $query = mysql_query (‚select * from tbl_customer"); $num=mysql_num_rows($query); if($num>0) { while($fetch=mysql_fetch_array($query) { .................. }
- 12. Questions? ‚A good question deserve a good grade…‛
- 13. End of day
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