PHP Design Pattern Factory Pattern_PHP Tutorial

I often use mysql database, so the program only writes the database operation class of mysql. I hope that all the experts will write down all the other categories, and it is best to send a copy to me.
db_mysql.php inherits the db.php interface and specifically implements various methods of database operations. If you are sure that your database platform will not change, you do not need a factory class, just use this one.

Copy code The code is as follows:

/**
* @author 黄建文
* @version V1.0
* @email hjwtp2005@qq.com
* @data 2008-12-16
* ==================================================================
* @example
* include 'db_mysql.php';
* $db=new db_mysql('localhost','root','admin','emtit');
* $sqlstr="SELECT * FROM member WHERE memberid=1";
* var_dump($db->get_one($sqlstr));
* ===================================================================
*/
include 'db.php';
class db_mysql implements db {

private $connid;

public function db_mysql($dbhost,$username,$passowrd,$dbname='', $dbcharset='utf8'){
$this->connid=mysql_connect($dbhost,$username,$passowrd);
if (!$this->connid){
$this- >halt('Can not connect to MySQL server');
}
if (emptyempty($dbcharset)){
$dbcharset='utf8';
}
// when When the mysql version is 4.1 or above, enable the database character set setting
if($this->version() > '4.1' && $dbcharset)
{
mysql_query("SET NAMES '".$ dbcharset."'" , $this->connid);
}
// When the mysql version is 5.0 or above, set sql mode
if($this->version() > ' 5.0')
{
mysql_query("SET sql_mode=''" , $this->connid);
}
if (!emptyempty($dbname)){
$this ->select_db($dbname);
}

}
/**
* Select database
*
* @param unknown_type $dbname
*/
public function select_db($dbname){
mysql_select_db($dbname, $this->connid);

}
/**
* Execute SQL statement
*
* @param unknown_type $sqlstr
*/
public function query($sqlstr){
$query=mysql_query($sqlstr,$this ->connid);
if (!$query){
$this->halt('MySQL Query Error', $sqlstr);
}
return $query;
}
/**
* Get a query record
*
* @return unknown
*/
public function get_one($sqlstr){
$query=$this->query($sqlstr);
$rs = $this-> ;fetch_array($query);
$this->free_result($query);
return $rs ;
}
/**
* Get a row from the result set as an associative array
* @param resource database query result resource
* @param string defines the return type
* @return array
*/
public function fetch_array( $query, $result_type = MYSQL_ASSOC)
{
return mysql_fetch_array($query, $result_type);
}

/**
* Get the number of record rows affected by the previous MySQL operation
* @return int
*/
public function affected_rows( )
{
return mysql_affected_rows($this->connid);
}
/**
* Get the number of rows in the result set
* @return int
*/
public function num_rows($query)
{
return mysql_num_rows($query);
}

/**
* Returns the number of fields in the result set
* @return int
*/
public function num_fields($query)
{
return mysql_num_fields($query);
}

/**
* Release result memory
*
* @param unknown_type $query
* @return bool
*/
public function free_result($query)
{
return mysql_free_result($query);
}
/ **
* Get the ID generated by the previous INSERT operation
* @return int
*/
public function insert_id()
{
return mysql_insert_id($this->connid);
}

/**
* Get MySQL server information
*
* @return string
* /
public function version()
{
return mysql_get_server_info($this->connid);
}
/**
* Close MYSQL connection
*
* @return bool
*/
public function close()
{
return mysql_close($this->connid);
}
/**
* Return error string
*
* @return string
*/ private function error(){
return @mysql_error($this-> ;connid);
}
/**
* Return error number
*
* @return int
*/
private function errno(){
return intval(@mysql_errno($this->connid));
}
/**
* Output error message
*
* @param string $message
* @param string $sql
*/
private function halt($message = '', $sql = ''){
exit("MySQL Query:$sql
MySQL Error:" .$this->error()."
MySQL Errno:".$this->errno()."
Message:$message");
}
}
?>

db.php database operation interface, defines the method of database operation.

Copy code The code is as follows:

interface db {

function select_db($dbname);//Select database
function query($sqlstr);//Execute sql statement
function get_one($sqlstr);//Execute the sql statement and only get one record
function fetch_array($query);//Get a row from the result set as an associative array
function affected_rows();//Return operation Number of record rows affected
function num_rows($query);//Get the number of rows in the result set
function num_fields($query);//Return the number of fields in the result set
function free_result($query );//Release resources
function insert_id();//Return the ID of the last inserted record;
function version();//Database version
function close();//Close the database connection
}
?>

db_factory.php database factory class. To make the database platform more convenient, you must use this class

Copy code The code is as follows:

/**
* @author 黄建文
* @version v1.0
* @email hjwtp2005@qq.com
* @example
* $db=db_factcory::create('MYSQL','localhost','root','admin','emtit');
* $sqlstr="SELECT * FROM member WHERE memberid=1";
* $db->get_one($sqlstr);
*/
include 'db_mysql.php';
class db_factory {
function db_factory() {
}
static function create($type,$dbhost,$username,$password,$dbname='',$dbcharset=''){
switch ($type ){
case 'MYSQL':
return new db_mysql($dbhost,$username,$password,$dbname,$dbcharset);
case 'SQLSERVER':
return new db_sqlserver($dbhost ,$username,$password,$dbname,$dbcharset);
case 'ACCESS':
return new db_access($dbhost,$username,$password,$dbname,$dbcharset);
case ' ORACLE':
return new db_oracle($dbhost,$username,$password,$dbname,$dbcharset);
}
return false;
}
function __destruct() {
}
}
?>

http://www.bkjia.com/PHPjc/319675.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/319675.htmlTechArticleI often use mysql database, so the program only writes the database operation class of mysql. I hope that all the experts will write down all the other categories, and it is best to send a copy to me. db_mysql.php inherits the db.php interface, with...