PDO encapsulation-php Tutorial

PDO encapsulation problems. The network uploads a PDO Mysql package. I think it is a problem. I learned JAVA before and just got in touch with PHP. The code is as follows: & lt ;? Php ** & nbsp; * database PDO Operations & nbsp; * classMysqlPdo {publicstatic $ PDOStatementnull; *** database connection parameter configuration * @ var PDO encapsulation problem.
The network uploads a PDO Mysql package. I think it is a problem. I learned JAVA before and just got in touch with PHP. The code is as follows:
/**
* Database PDO operations
*/
Class MysqlPdo {
Public static $ PDOStatement = null;
/**
* Database connection parameter configuration
* @ Var array
* @ Access public
*/
Public static $ config = array ();
/**
* Whether to use permanent connection
* @ Var bool
* @ Access public
*/
Public static $ pconnect = false;
/**
* Error message
* @ Var string
* @ Access public
*/
Public static $ error = '';
/**
* In single-piece mode, the unique instance of the Pdo class is saved and the connection resource of the database is saved.
* @ Var object
* @ Access public
*/
Protected static $ link;
/**
* Whether the database has been connected
* @ Var bool
* @ Access public
*/
Public static $ connected = false;
/**
* Database version
* @ Var string
* @ Access public
*/
Public static $ dbVersion = null;
/**
* Current SQL statement
* @ Var string
* @ Access public
*/
Public static $ queryStr = '';
/**
* Last inserted record ID
* @ Var integer
* @ Access public
*/
Public static $ lastInsertId = null;
/**
* Number of affected records returned
* @ Var integer
* @ Access public
*/
Public static $ numRows = 0;
// Transaction instruction count
Public static $ transTimes = 0;
/**
* Constructor,
* @ Param $ dbconfig database connection information, array ('servername', 'username', 'password', 'defaultdb', 'DB _ port', 'DB _ type ')
*/
Public function _ construct ($ dbConfig = ''){
If (! Class_exists ('pdo '))
Throw_exception ("not supported: PDO ");

// Use the default data definition if no parameters are transmitted
If (! Is_array ($ dbConfig )){
$ DbConfig = array ('hostname' => DB_HOST, 'username' => DB_USER, 'password' => DB_PWD, 'database' => DB_NAME, 'hostport' => DB_PORT, 'dbms '=> DB_TYPE, 'dsn' => DB_TYPE. ": host = ". DB_HOST. "; dbname = ". DB_NAME );
}
If (empty ($ dbConfig ['hostname'])
Throw_exception ("no database configuration defined ");
Self: $ config = $ dbConfig; // pass the input configuration parameters to the Static variable.
If (empty (self: $ config ['params']) // ???
Self: $ config ['params'] = array ();
/************************************ Gorgeous separation line **************************************** ***/
If (! Isset (self: $ link )){
$ Configs = self: $ config; // Copy the configuration information.
If (self: $ pconnect ){
$ Configs ['params'] [constant ('pdo: ATTR_PERSISTENT ')] = true;
}
Try {
Self: $ link = new PDO ($ configs ['dsn '], $ configs ['username'], $ configs ['password'], $ configs ['params']);
} Catch (PDOException $ e ){
Throw_exception ($ e-> getMessage ());

// Exit ('connection failed: '. $ e-> getMessage ());
}
If (! Self: $ link ){
Throw_exception ('pdo CONNECT error ');
Return false;
}
Self: $ link-> exec ('set names'. DB_CHARSET );
Self: $ dbVersion = self: $ link-> getAttribute (constant ("PDO: ATTR_SERVER_INFO "));
// Mark the connection successful
Self: $ connected = true;
// Cancel database connection configuration
Unset ($ configs );
}
Return self: $ link;
}
/**
* Release query results
* @ Access function
*/
Static function free (){
Self: $ PDOStatement = null;
}
/*************************************** **************************************** **************************/
/* Database operations */
/*************************************** **************************************** **************************/
/**
* Obtain all query data
* @ Access function
* @ Return array
*/
Static function getAll ($ SQL = null ){
Self: query ($ SQL );
// Return the dataset
$ Result = self ::$ PDOStatement-> fetchAll (constant ('pdo: FETCH_ASSOC '));
Return $ result;
}
/**
* Obtain a query result.
* @ Access function
* @ Param string $ SQL SQL command
* @ Param integer $ seek pointer position
* @ Return array
*/
Static function getRow ($ SQL = null ){