php实现的pdo公共类定义与用法示例
发布时间：2021-01-31 18:39:38 所属栏目：PHP教程 来源：网络整理
导读：本篇章节讲解php实现的pdo公共类定义与用法。供大家参考研究具体如下： db.class.php ： dsn = 'mysql:host=' . $dbHost . ';dbname=
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本篇章节讲解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,$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($dbHost,$dbCharset='utf8') { if (self::$_instance === null) { self::$_instance = new self($dbHost,$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($table,$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,'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：《》、《》、《》、《》、《》、《》及《》 希望本文所述对大家PHP程序设计有所帮助。 （编辑：威海站长网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
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