Php design pattern factory pattern _ PHP Tutorial

Php design mode: Factory mode. I often use mysql databases, so the program only writes mysql database operations. I hope you can write all the other classes in your hand. you 'd better send me one. Db_mysql.php inherits the db. php interface and is commonly used in mysql databases. Therefore, the program only writes the mysql database operation class. I hope you can write all the other classes in your hand. you 'd better send me one.
Db_mysql.php inherits the db. php interface and implements various database operations methods. if you are sure that your database platform will not change, you don't need a factory class. just use this.

The code is as follows:

/**
* @ Author Huang Jianwen
* @ 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 ';
}
// Enable database character set setting when mysql version is 4.1 or later
If ($ this-> version ()> '4. 1' & $ dbcharset)
{
Mysql_query ("set names '". $ dbcharset. "'", $ this-> connid );
}
// Set the SQL mode when mysql version is 5.0 or later.
If ($ this-> version ()> '5. 0 ')
{
Mysql_query ("SET SQL _mode ='' ", $ this-> connid );
}
If (! Emptyempty ($ dbname )){
$ This-> select_db ($ dbname );
}

}
/**
* Select a database
*
* @ Param unknown_type $ dbname
*/
Public function select_db ($ dbname ){
Mysql_select_db ($ dbname, $ this-> connid );

}
/**
* Execute SQL statements
*
* @ Param unknown_type $ sqlstr
*/
Public function query ($ sqlstr ){
$ Query = mysql_query ($ sqlstr, $ this-> connid );
If (! $ Query ){
$ This-> halt ('MySQL Query error', $ sqlstr );
}
Return $ query;
}
/**
* Retrieve 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 associated 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 );
}

/**
* Obtain the number of rows affected by the previous MySQL operation.
* @ Return int
*/
Public function affected_rows ()
{
Return mysql_affected_rows ($ this-> connid );
}
/**
* Number of rows in the result set
* @ Return int
*/
Public function num_rows ($ query)
{
Return mysql_num_rows ($ query );
}

/**
* Number of fields in the returned result set
* @ Return int
*/
Public function num_fields ($ query)
{
Return mysql_num_fields ($ query );
}

/**
* Release the result memory.
*
* @ Param unknown_type $ query
* @ Return bool
*/
Public function free_result ($ query)
{
Return mysql_free_result ($ query );
}
/**
* Obtain the ID generated by the previous INSERT operation.
* @ Return int
*/
Public function insert_id ()
{
Return mysql_insert_id ($ this-> connid );
}

/**
* Obtain MySQL server information
*
* @ Return string
*/
Public function version ()
{
Return mysql_get_server_info ($ this-> connid );
}
/**
* Close the MYSQL connection
*
* @ Return bool
*/
Public function close ()
{
Return mysql_close ($ this-> connid );
}
/**
* Returns an error string.
*
* @ Return string
*/Private function error (){
Return @ mysql_error ($ this-> connid );
}
/**
* The error code is returned.
*
* @ Return int
*/
Private function errno (){
Return intval (@ mysql_errno ($ this-> connid ));
}
/**
* Output error information
*
* @ 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, which defines database operation methods.

The code is as follows:

Interface db {

Function select_db ($ dbname); // select a database
Function query ($ sqlstr); // execute an SQL statement
Function get_one ($ sqlstr); // execute an SQL statement to obtain only one record
Function fetch_array ($ query); // retrieves a row from the result set as an associated array
Function affected_rows (); // number of records affected by the return operation
Function num_rows ($ query); // Obtain the number of rows in the result set.
Function num_fields ($ query); // number of fields in the returned result set
Function free_result ($ query); // release resources
Function insert_id (); // returns the ID of the last inserted record;
Function version (); // database version
Function close (); // close the database connection
}
?>

Db_factory.php database factory class, which must be used more conveniently to implement the database platform

The code is as follows:

/**
* @ Author Huang Jianwen
* @ 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 (){
}
}
?>

Bytes. I hope you can write all the other classes in your hand. you 'd better send me one. Db_mysql.php inherits the db. php interface,...