本文实例讲述了php基于PDO实现功能强大的MYSQL封装类。分享给大家供大家参考，具体如下：

class CPdo{
 protected $_dsn = "mysql:host=localhost;dbname=test";
 protected $_name = "root";
 protected $_pass = "";
 protected $_condition = array();
 protected $pdo;
 protected $fetchAll;
 protected $query;
 protected $result;
 protected $num;
 protected $mode;
 protected $prepare;
 protected $row;
 protected $fetchAction;
 protected $beginTransaction;
 protected $rollback;
 protected $commit;
 protected $char;
 private static $get_mode;
 private static $get_fetch_action;
 /**
 *pdo construct
 */
 public function __construct($pconnect = false) {
  $this->_condition = array(PDO::ATTR_PERSISTENT => $pconnect);
  $this->pdo_connect();
 }
 /**
 *pdo connect
 */
 private function pdo_connect() {
  try{
   $this->pdo = new PDO($this->_dsn,$this->_name,$this->_pass,$this->_condition);
  }
  catch(Exception $e) {
   return $this->setExceptionError($e->getMessage(), $e->getline, $e->getFile);
  }
 }
 /**
 *self sql get value action
 */
 public function getValueBySelfCreateSql($sql, $fetchAction = "assoc",$mode = null) {
  $this->fetchAction = $this->fetchAction($fetchAction);
  $this->result = $this->setAttribute($sql, $this->fetchAction, $mode);
  $this->AllValue = $this->result->fetchAll();
  return $this->AllValue;
 }
 /**
 *select condition can query
 */
 private function setAttribute($sql, $fetchAction, $mode) {
  $this->mode = self::getMode($mode);
  $this->fetchAction = self::fetchAction($fetchAction);
  $this->pdo->setAttribute(PDO::ATTR_CASE, $this->mode);
  $this->query = $this->base_query($sql);
  $this->query->setFetchMode($this->fetchAction);
  return $this->query;
 }
 /**
 *get mode action
 */
 private static function getMode($get_style){
  switch($get_style) {
   case null:
    self::$get_mode = PDO::CASE_NATURAL;
   break;
   case true:
    self::$get_mode = PDO::CASE_UPPER;
   break;
   case false;
   self::$get_mode= PDO::CASE_LOWER;
   break;
  }
  return self::$get_mode;
 }
 /**
 *fetch value action
 */
 private static function fetchAction($fetchAction) {
  switch($fetchAction) {
   case "assoc":
    self::$get_fetch_action = PDO::FETCH_ASSOC; //asso array
   break;
   case "num":
    self::$get_fetch_action = PDO::FETCH_NUM; //num array
   break;
   case "object":
    self::$get_fetch_action = PDO::FETCH_OBJ; //object array
   break;
   case "both":
    self::$get_fetch_action = PDO::FETCH_BOTH; //assoc array and num array
   break;
   default:
    self::$get_fetch_action = PDO::FETCH_ASSOC;
   break;
  }
  return self::$get_fetch_action;
 }
 /**
 *get total num action
 */
 public function rowCount($sql) {
  $this->result = $this->base_query($sql);
  $this->num = $this->result->rowCount();
  return $this->num;
 }
 /*
 *simple query and easy query action
 */
 public function query($table, $column = "*",$condition = array(), $group = "",$order = "", $having = "", $startSet = "",$endSet = "",$fetchAction = "assoc",$params = null){
  $sql = "select ".$column." from `".$table."` ";
  if ($condition != null) {
   foreach($condition as $key=>$value) {
    $where .= "$key = '$value' and ";
   }
   $sql .= "where $where";
   $sql .= "1 = 1 ";
  }
  if ($group != "") {
   $sql .= "group by ".$group." ";
  }
  if ($order != "") {
   $sql .= " order by ".$order." ";
  }
  if ($having != "") {
   $sql .= "having '$having' ";
  }
  if ($startSet != "" && $endSet != "" && is_numeric($endSet) && is_numeric($startSet)) {
   $sql .= "limit $startSet,$endSet";
  }
  $this->result = $this->getValueBySelfCreateSql($sql, $fetchAction, $params);
  return $this->result;
 }
 /**
 *execute delete update insert and so on action
 */
 public function exec($sql) {
  $this->result = $this->pdo->exec($sql);
  $substr = substr($sql, 0 ,6);
  if ($this->result) {
   return $this->successful($substr);
  } else {
   return $this->fail($substr);
  }
 }
 /**
 *prepare action
 */
 public function prepare($sql) {
  $this->prepare = $this->pdo->prepare($sql);
  $this->setChars();
  $this->prepare->execute();
  while($this->rowz = $this->prepare->fetch()) {
   return $this->row;
  }
 }
 /**
 *USE transaction
 */
 public function transaction($sql) {
  $this->begin();
  $this->result = $this->pdo->exec($sql);
  if ($this->result) {
   $this->commit();
  } else {
   $this->rollback();
  }
 }
 /**
 *start transaction
 */
 private function begin() {
  $this->beginTransaction = $this->pdo->beginTransaction();
  return $this->beginTransaction;
 }
 /**
 *commit transaction
 */
 private function commit() {
  $this->commit = $this->pdo->commit();
  return $this->commit;
 }
 /**
 *rollback transaction
 */
 private function rollback() {
  $this->rollback = $this->pdo->rollback();
  return $this->rollback;
 }
 /**
 *base query
 */
 private function base_query($sql) {
  $this->setChars();
  $this->query = $this->pdo->query($sql);
  return $this->query;
 }
 /**
 *set chars
 */
 private function setChars() {
  $this->char = $this->pdo->query("SET NAMES 'UTF8'");
  return $this->char;
 }
 /**
 *process sucessful action 
 */
 private function successful($params){
  return "The ".$params." action is successful";
 }
 /**
 *process fail action
 */
 private function fail($params){
  return "The ".$params." action is fail";
 }
 /**
 *process exception action
 */
 private function setExceptionError($getMessage, $getLine ,$getFile) {
  echo "Error message is ".$getMessage."<br /> The Error in ".$getLine." line <br /> This file dir on ".$getFile;
  exit();
 }
}

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