PHP and MySQL

Manipulate a MySQL Database 

1. Access a MySQL database with PHP code

<?

$con=mysql_connect("ServerName","Username","Password");

$db=mysql_select_db("DatabaseName","Connection Idenfier");

// Server name is the name of server that you are working on 99% it is "localhost"

// Username is the name of user of mysql database

// Password is the password of mysql database

// Database Name is the name of database that you created in mysql

?>

2. Reading records from a MySQL database

<?

$con=mysql_connect("localhost","root","mypass");

$db=mysql_select_db("mydb",$son);

$result=mysql_query("Select * from myTable") or die(mysql_error());

while($row=mysql_fetch_array($result))

{

echo $row["fieldName"]."<br>";

echo $row["fieldName2"]."<br>";

}

// mysql_query() used to execute the sql

// die() If some error occur than this function triggers

// mysql_error() Shows mysql error

// mysql_fetch_array() gets the records in an array

// mysql_num_rows() returns the number of rows found

?>

3. Adding records to a MySQL database

<?

mysql_query("Insert into myTable set fieldName='Test Value',fieldName2='Test Value2' ");

// This will insert a record to myTable

// mysql_insert_id(); If an autoincremnet field is set in table than it returns the id of last entered record.

// mysql_affected_rows() Returns the number of rows affected by Add,Delete and Updat operation

?>

4. Updating a record in a table

<?

mysql_query("Update myTable set fieldName='Test Value',fieldName2='Test Value2' where id='1' ");

?>

5. Deleting a record in a table
<?

mysql_query("delete from myTable where id='1' ");

?>

6. Using WHERE to limit the data returned

<?

mysql_query("select * from myTable where id='1' ");

?>