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.
![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 insertedā;
?>](https://image.slidesharecdn.com/introductiontophp-databaseconnectivity-140329032024-phpapp02/85/Introduction-to-php-database-connectivity-5-320.jpg)
![Retrieving data from mysql ā mysql_fetch_row()
$query = mysql_query (āselect * from tbl_customer");
while($fetch=mysql_fetch_array($query))
{
echo $fetch[0]; //prints first column the retrieved row
echo $fetch[1]; //prints second column the retrieved row
}](https://image.slidesharecdn.com/introductiontophp-databaseconnectivity-140329032024-phpapp02/85/Introduction-to-php-database-connectivity-8-320.jpg)
![Retrieving data from mysql ā mysql_fetch_array()
$query = mysql_query (āselect * from tbl_customer");
while($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*ānameā+; //prints first column the retrieved row
echo $fetch*āemailā+; //prints second column the retrieved row
}
āMysql_fetch_array() is a combination of mysql_fetch_assoc() and mysql_fetch_row()ā](https://image.slidesharecdn.com/introductiontophp-databaseconnectivity-140329032024-phpapp02/85/Introduction-to-php-database-connectivity-9-320.jpg)
Introduction to php database connectivity
- 1. PHP ā Mysql connectivity
- 2. How to connect PHP with MySQL 1. Connecting to MySQL Server ā¢ mysql_connect(āhost_nameā,āusernameā,āpasswordā); 2. Selecting Database ā¢ mysql_select_db(āDatabase Nameā); 3. Query execution ā¢ mysql_query(āquery to be executedā);
- 4. Example Program <html> <body> <form action=āregistration.phpā method=POST> <input type=ātextā name=ānameā> <input type=ātextā name=āemailā> </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 insertedā; ?>
- 6. Retrieving data from mysql ā¢ There are 4 ways we can retrieve data from mysql tables ļ§Mysql_fetch_array() ļ§Mysql_fetch_row() ļ§Mysql_fetch_assoc() ļ§Mysql_fetch_object() ā¢ 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 ā mysql_fetch_assoc() $query = mysql_query (āselect * from tbl_customer"); while($fetch=mysql_fetch_assoc($query)) { echo $fetch*ānameā+; echo $fetch*āvchr_emailā+; }
- 8. Retrieving data from mysql ā mysql_fetch_row() $query = mysql_query (āselect * from tbl_customer"); while($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 ā mysql_fetch_array() $query = mysql_query (āselect * from tbl_customer"); while($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*ānameā+; //prints first column the retrieved row echo $fetch*āemailā+; //prints second column the retrieved row } āMysql_fetch_array() is a combination of mysql_fetch_assoc() and mysql_fetch_row()ā
- 10. Retrieving data from mysql ā mysql_fetch_object() $query = mysql_query (āselect * from tbl_customer"); while($fetch=mysql_fetch_array($query)) { echo $fetch->name; //prints first column the retrieved row echo $fetch->email; //prints second column the retrieved row } āReturns an object with properties that correspond to the fetched row and moves the internal data pointer ahead.ā
- 11. Mysql_num_rows() ā¢ PHP provides another utility inbuilt function mysql_num_rows() which will return the number of rows returned from the executed query ā Example $query = mysql_query (āselect * from tbl_customer"); $num=mysql_num_rows($query); if($num>0) { while($fetch=mysql_fetch_array($query) { .................. }
- 12. Questions? āA good question deserve a good gradeā¦ā
- 13. End of day
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