Php Mysql

PHP and DatabasePHP and Database

 MysqlMysql – popular open-source database– popular open-source database
management systemmanagement system
 PHPPHP usually works withusually works with MysqlMysql for web-basedfor web-based
database applicationsdatabase applications
 LAMPLAMP applications—Web-based applicationsapplications—Web-based applications
that usethat use LynuxLynux,, ApacheApache,, MysqlMysql, and, and
php/pearl/pythonphp/pearl/python

 Connect to host server which has MysqlConnect to host server which has Mysql
installedinstalled
 Select a databaseSelect a database
 Form an SQL statementForm an SQL statement
 Execute the SQL statement and (optionally)Execute the SQL statement and (optionally)
return a record setreturn a record set
 Extract data from recordset using phpExtract data from recordset using php
 Close connectionClose connection

<?php<?php
$host = ‘localhost’;$host = ‘localhost’;
$username = ‘peter’;$username = ‘peter’;
$pswd = ‘!?+&*’;$pswd = ‘!?+&*’;
$dbName = “myDB”;$dbName = “myDB”;
$con = mysql_connect($host, $username,$con = mysql_connect($host, $username,
$pswd);$pswd);
if (!$con){if (!$con){
die('Could not connect: ‘die('Could not connect: ‘
. mysql_error());. mysql_error());
}}
$db = mysql_select_db($dbName,$db = mysql_select_db($dbName,
$con) or die(mysql_error());$con) or die(mysql_error());
?>?>

 SQL
 CREATE DATABASE database_name
 PHP
$con = mysql_connect("localhost","peter",
"abc123");
$sql = “CREATE DATABASE myDB”;
mysql_query(“$sql”, $con));

 SQL
 CREATE TABLE table_name
(column_name1 data_type,
column_name2 data_type,
column_name3 data_type,
....
);

 PHP
// Connect to Mysql
$con = mysql_connect(. . .);
// Create database
mysql_query("CREATE DATABASE my_db",$con);
// Select DB
mysql_select_db("my_db", $con);
// Create table
$sql = "CREATE TABLE Persons(
FirstName varchar(15),
LastName varchar(15),
Age int
)”;
// Execute SQL statement
mysql_query($sql, $con);
";
Contd:Contd:

 When DB already exists:When DB already exists:
 PHPPHP
$con = mysql_connect("localhost","peter",$con = mysql_connect("localhost","peter",
"abc123");"abc123");
$db = mysql_select_db("my_db“,$db = mysql_select_db("my_db“,
$con);$con);

 SQL
SELECT colName1, colName2, colName3SELECT colName1, colName2, colName3
FROM Persons;FROM Persons;
 PHP
$con = mysql_connect(. . .);$con = mysql_connect(. . .);
mysql_select_db("my_db“, $con);mysql_select_db("my_db“, $con);
$sql = “SELECT FirstName, LastName$sql = “SELECT FirstName, LastName
FROM Persons;”;FROM Persons;”;
$result = mysql_query($sql);$result = mysql_query($sql);

 PHP
$result = mysql_query($sql);$result = mysql_query($sql);
while($row =while($row =
mysql_fetch_array($result)){mysql_fetch_array($result)){
echo $row['FirstName'] . " " .echo $row['FirstName'] . " " .
$row['LastName'];$row['LastName'];
echo "<br />";echo "<br />";
}}

 SQL
INSERT INTO table_nameINSERT INTO table_name
VALUES (value1, value2, value3,...)VALUES (value1, value2, value3,...)
oror
INSERT INTO table_nameINSERT INTO table_name
(column1, column2,(column1, column2,
column3,...)column3,...)
VALUES (value1, value2, value3,...)VALUES (value1, value2, value3,...)

<?php
$con = mysql_connect(“…",“…",“…");
if (!$con)
die('Could not connect: ' . mysql_error());
mysql_query("INSERT INTO Persons (FirstName,
LastName, Age)
VALUES ('Peter','Griffin','35')");
mysql_query("INSERT INTO Persons (FirstName,
LastName, Age)
VALUES ('Glenn', ‘Brown', '33')");
mysql_close($con);
?>
Contd:Contd:

<html><html>
<body><body>
<form action="insert.php" method="post"><form action="insert.php" method="post">
Firstname: <input type="text" name=“nameF" />Firstname: <input type="text" name=“nameF" />
Lastname: <input type="text" name=“nameL" />Lastname: <input type="text" name=“nameL" />
Age: <input type="text" name="age" />Age: <input type="text" name="age" />
<input type="submit" /><input type="submit" />
</form></form>
</body></body>
</html></html>

<?php
if (!$con)
die('Could not connect: ' . mysql_error());
$sql="INSERT INTO Persons
(FirstName, LastName, Age)
VALUES ('$_POST[firstname]',
'$_POST[lastname]',
'$_POST[age]')";
if (!mysql_query($sql,$con))
die('Error: ' . mysql_error());
echo "1 record added";
mysql_close($con)
?>
Contd:Contd:

 SQL
UPDATE table_nameUPDATE table_name
SET column1=value, column2=value2,...SET column1=value, column2=value2,...
WHERE some_column = some_value;WHERE some_column = some_value;

<?php
if (!$con)
die('Could not connect: ' .
mysql_error());
$sql = “UPDATE Persons
SET Age = ’36’
WHERE FirstName = ‘Peter’
AND LastName = “Griffin’”;
mysql_close($con);
?>
Contd:Contd:

 SQL
Delete table_nameDelete table_name
WHERE some_column = some_value;WHERE some_column = some_value;

<?php
if (!$con)
die('Could not connect: ' .
mysql_error());
$sql = “DELETE FROM Persons
WHERE FirstName = ‘Peter’
AND LastName = “Griffin’”);
mysql_close($con);
?>
Contd:Contd:

Php Mysql

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