php实现的pdo公共类定义与用法示例

php  /  管理员 发布于 7年前   261

本文实例讲述了php实现的pdo公共类定义与用法。分享给大家供大家参考，具体如下：

db.class.php ：

dsn = 'mysql:host=' . $dbHost . ';dbname=' . $dbName;      $this->dbh = new \PDO($this->dsn, $dbUser, $dbPasswd);      $this->dbh->setAttribute(\PDO::ATTR_EMULATE_PREPARES, false);      $this->dbh->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);      $this->dbh->exec('SET character_set_connection='.$dbCharset.';SET character_set_client='.$dbCharset.';SET character_set_results='.$dbCharset);    } catch (Exception $e) {      $this->outputError($e->getMessage());     }  }  public static function getInstance($dbHost, $dbUser, $dbPasswd, $dbName, $dbCharset='utf8') {    if (self::$_instance === null) {      self::$_instance = new self($dbHost, $dbUser, $dbPasswd, $dbName, $dbCharset);    }    return self::$_instance;  }  public function fetchAll($sql, $params = array()) {    try {      $stm = $this->dbh->prepare($sql);      if ($stm && $stm->execute($params)) {        return $stm->fetchAll(\PDO::FETCH_ASSOC);      }    } catch (Exception $e) {      $this->outputError($e->getMessage());    }  }  public function fetchOne($sql, $params = array()) {    try {      $result = false;      $stm = $this->dbh->prepare($sql);      if ($stm && $stm->execute($params)) {        $result = $stm->fetch(\PDO::FETCH_ASSOC);      }      return $result;    } catch (Exception $e) {      $this->outputError($e->getMessage());    }  }  public function fetchColumn($sql, $params = array()) {    $result = '';    try {      $stm = $this->dbh->prepare($sql);      if ($stm && $stm->execute($params)) {        $result = $stm->fetchColumn();      }      return $result;    } catch (Exception $e) {      $this->outputError($e->getMessage());    }  }  public function insert($table, $params = array(), $returnLastId = true) {    $_implode_field = '';    $fields = array_keys($params);    $_implode_field = implode(',', $fields);    $_implode_value = '';    foreach ($fields as $value) {      $_implode_value .= ':'. $value.',';    }    $_implode_value = trim($_implode_value, ',');    $sql = 'INSERT INTO ' . $table . '(' . $_implode_field . ') VALUES ('.$_implode_value.')';    try {      $stm = $this->dbh->prepare($sql);      $result = $stm->execute($params);      if ( $returnLastId ) {        $result = $this->dbh->lastInsertId();      }      return $result;    } catch (Exception $e) {      $this->outputError($e->getMessage());    }  }  public function update($table, $params = array(), $where = null) {    $_implode_field = '';    $_implode_field_arr = array();    if ( empty($where) ) {      return false;    }    $fields = array_keys($params);    foreach ($fields as $key) {      $_implode_field_arr[] = $key . '=' . ':'.$key;    }    $_implode_field = implode(',', $_implode_field_arr);    $sql = 'UPDATE ' . $table . ' SET ' . $_implode_field . ' WHERE ' . $where;    try {      $stm = $this->dbh->prepare($sql);      $result = $stm->execute($params);      return $result;    } catch (Exception $e) {      $this->outputError($e->getMessage());    }  }  public function delete($sql, $params = array()) {    try {      $stm = $this->dbh->prepare($sql);      $result = $stm->execute($params);      return $result;    } catch (Exception $e) {      $this->outputError($e->getMessage());    }  }  public function exec($sql, $params = array()) {    try {      $stm = $this->dbh->prepare($sql);      $result = $stm->execute($params);      return $result;    } catch (Exception $e) {      $this->outputError($e->getMessage());    }  }  private function outputError($strErrMsg) {    throw new Exception("MySQL Error: " . $strErrMsg);  }  public function __destruct() {    $this->dbh = null;  }}

实例：

 12,);$res = $pdo->fetchOne($sql, $parame);var_dump($res);$sql = 'SELECT * FROM cms_link';$result = $db->fetchAll($sql);print_r($result);//查询记录数量$sql = 'SELECT COUNT(*) FROM cms_link';$count = $db->fetchColumn($sql);echo $count;$data = array(  'siteid' => 1,  'linktype' => 1,  'name' => 'google',  'url' => 'http://www.google.com',  'listorder' => 0,  'elite' => 0,  'passed' => 1,  'addtime' => time()  );$lastInsertId = $db->insert('cms_link', $data);echo $lastInsertId;//用 try try {     $result = $pdo->insert('news', $essay);   } catch (Exception $e) {     error_log($e->getMessage());     error_log($e->getMessage() . ' in ' . __FILE__ . ' on line ' . __LINE__);     saveLog('url文章 : ' . $essay['link'] . '  数据插入失败
');     continue;   }$data = array(  'siteid' => 1,  'linktype' => 1,  'name' => 'google',  'url' => 'http://www.google.com',  'listorder' => 0,  'elite' => 0,  'passed' => 1,  'addtime' => time()  );$db->insert('cms_link', $data);$sql = 'DELETE FROM cms_link WHERE linkid=4';$result = $db->delete($sql);var_dump($result);

更多关于PHP相关内容感兴趣的读者可查看本站专题：《PHP基于pdo操作数据库技巧总结》、《php+Oracle数据库程序设计技巧总结》、《PHP+MongoDB数据库操作技巧大全》、《php面向对象程序设计入门教程》、《php字符串(string)用法总结》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》

希望本文所述对大家PHP程序设计有所帮助。

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