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PHP – Mysql connectivity
| Date post: | 20-Jun-2015 |
| Category: |
Technology |
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PHP – Mysql connectivity
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‛);
Sample Application
Example Program
<html>
<body>
<form action=‛registration.php‛ method=POST>
<input type=‚text‛ name=‚name‛>
<input type=‚text‛ name=‚email‛>
</form>
</body>
</html>
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‚;
?>
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
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’+;
}
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
}
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()‛
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.‛
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)
{ .................. }
Questions?
‚A good question deserve a good grade…‛
End of day
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