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Data access and encapsulation using PHP

Source: Internet
Author: User
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PHP Data access:

<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 "/>
<title> Untitled Document </title>

<body>
<?php

Build a connection, create a Connection object
$db = new Mysqli ("localhost", "root", "123", "MyDB");

Judging if there is an error
/*if (Mysqli_connect_error ())
{
echo "Connection failed! ";
Exit
}*/

Mysqli_connect_error () Die ("Connection Failed"): "";

Write SQL statements
$sql = "SELECT * from Info";

Executes the SQL statement, returning the result set object
$reslut = $db->query ($sql);

Reading data from the result set, returning an array
$attr = $reslut->fetch_all (); Reads all data, returns an indexed two-dimensional array

$attr = $reslut->fetch_array (); Reads the data that the current pointer points to, and returns an array that exists for the Index association

$attr = $reslut->fetch_assoc (); Returns an associative array

$attr = $reslut->fetch_row (); Returns an indexed array

$attr = $reslut->fetch_object (); Return object
/* $arr = array ();
while ($attr = $reslut->fetch_row ())
{
Array_push ($arr, $attr);
}

Var_dump ($arr); * *

?>

</body>
Encapsulation:

<?php
//Build a file that encapsulates the class DBDA.class.php

Class dbda//defines a class with the class name Dbda
{
Public $host = " localhost ";//4 a more commonly used parameter: server address
Public $uid =" root ";//user name
Public $PDW =" 666 ";//password
Public $dbname =" Toupiao ";// Database name

//encapsulation Method
//1. Method of returning a two-dimensional array
/**
* Give an SQL statement that returns the result of execution
* @param string $sql user-specified SQL statement
* @param int $ SQL user-given statement type, 0 for additions and deletions, 1 for the query. General query use more, let $type default value is 1. If you change the value of the $type.
* @return Array Returns the result of the query and, if it is a query, returns a two-dimensional array. If the additions and deletions are changed, return to $result.
*/
Function Query ($sql, $type =1)
{
//Build Connection object
$db = new Mysqli ("$this->host", "$this->uid", "$ THIS->PDW "," $this->dbname ");

//Execute SQL statement
$result = $db->query ("$sql");

//Fetch data from the result set object. Queries do one method alone, others do another.
if ($type ==1)//If it is a query
{
return $result->fetch_all ();//Returns a two-dimensional array of queries
}
else//If additions and deletions are changed
{
Return $ result;//return $result
}
}
}
?

Reference to interface:

<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">

<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 "/>
<title> Untitled Document </title>

<body>

<?php
Include ("DBDA.class.php");//introduce the encapsulated class to this page
$db = new Dbda ();//Create a new object
$sql = "SELECT * from Info";
Var_dump ($db->query ($sql));//The 2nd parameter is a query, because the default value is 1.
?>

</body>

Data access and encapsulation using PHP

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Related Keywords:
php encapsulation example insert data using php php data access layer using php and mysql using php to access mysql php and access database php and access

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