PHP - Mysql using PDO extention

1. Presented by:-
Mr. Ajinkya NaharMr. Ajinkya Nahar
Twitter - @ajinkyanaharTwitter - @ajinkyanahar
LinkedIn –LinkedIn –
http://in.linkedin.com/pub/ajinkya-http://in.linkedin.com/pub/ajinkya-
nahar/8/404/77bnahar/8/404/77b

2. Features
PDO requires PHP Version 5.
PDO makes use of two main objects.
Once we have established a connection to the specific
database, the methods used to access and manipulate data
are all generic, and do not require re-writing if you change
the type of database.
The PDO object itself represents a connection to the
database, and provides simple methods to execute an SQL
statement.
The PDOStatement object represents a prepared
statement, as well as a result set from an executed SQL
statement.

3. PDO Object and most useful statement
This represents a connection to the Database.
All database operations are initiated through the PDO
object. The PDO object is created when you connect to the
database.
After that, we can use its methods to access the database.
exec():-
Execute an SQL statement returning the number of rows
affected.
query() :-
Execute an SQL statement returning a result set as a
PDOStatement .

4. prepare():-
Prepares a statement returning a result set as a
PDOStatement.
We can use question marks (?) for values.
we can then call the execute(array()) method.

5. The PDOStatement represents a prepared statement, as
well as a returned result set.
PDO->query operation (where it represents a result set),
a
PDO->prepare operation (where it represents a
prepared statement) or a
PDO->execute operation (where it represents a result
set from your prepared statement)
For a prepared statement:-
execute() :-Execute the prepared statement. We can use
an array of values to replace the question mark
parameters.
Prepared Statement

6. For a result set:
fetch() :-Returns the next row.
Useful arguments: PDO::FETCH_ASSOC,
PDO::FETCH_NUM,
PDO::FETCH_BOTH (default)
fetchAll():- Returns the whole result set as an array
fetchColumn() :-Returns a single column of the next row.

7. $database = ‘database_name';
$user = ‘user';
$password = ‘password';
$dsn = "mysql:host=localhost;dbname=$database";
try {
$pdo = new PDO ($dsn, $user, $password);
}
catch(PDOException $e)
{
die ('Oops'); // Exit, displaying an error message
}
Establish Connection to MySql

8. Code Examples
For SELECT query -
$sql = 'SELECT * FROM users WHERE email = ? AND
password = ?';
$pds = $pdo->prepare($sql);
$pds->execute(array(
$email,
$password
));

9. For INSERT query -
$sql = 'INSERT INTO users(email,password)
VALUES(?,?)';
$pds = $pdo->prepare($sql);
$pds->execute(array(
$email,
$password
));

10. For UPDATE query -
$sql = 'UPDATE users SET email=?, password=?
WHERE id=?';
$pds = $pdo->prepare($sql);
$pds->execute(array(
$email,
$password,
$id
));

11. For DELETE query -
$sql = 'DELETE FROM users WHERE id = ?';
$pds = $pdo->prepare($sql);
$pds->execute(array(
$id
));

12. For like query -
$sql = 'SELECT * FROM users WHERE email like ?';
$pds = $pdo->prepare($sql);
$pds->execute(array(
‘%$email%’
));