微信公众号搜"智元新知"关注
微信扫一扫可直接关注哦!

PHP的PDO常用类库实例分析

本文实例讲述了PHP的PDO常用类库。分享给大家供大家参考,具体如下:

1、Db.class.PHP 连接数据库

rush:PHP;"> setAttribute(PDO::ATTR_PERSISTENT,true); // 设置数据库连接为持久连接 $pdo->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION); // 设置抛出错误 $pdo->setAttribute(PDO::ATTR_ORACLE_NULLS,true); // 设置当字符串为空转换为 sql 的 NULL $pdo->query('SET NAMES utf8'); // 设置数据库编码 } catch (PDOException $e) { exit('数据库连接错误错误信息:'. $e->getMessage()); } return $pdo; } } ?>

2、Model.class.PHP 数据库操作类

rush:PHP;"> _db = Db::getDB(); } /** * 数据库添加操作 * @param string $tName 表名 * @param array $field 字段数组 * @param array $val 值数组 * @param bool $is_lastInsertId 是否返回添加ID * @return int 认返回成功与否,$is_lastInsertId 为true,返回添加ID */ public function insert($tName,$fields,$vals,$is_lastInsertId=FALSE) { try { if (!is_array($fields) || !is_array($vals)) exit($this->getError(__FUNCTION__,__LINE__)); $fields = $this->formatArr($fields); $vals = $this->formatArr($vals,false); $tName = $this->formatTabName($tName); $this->_sql = "INSERT INTO {$tName} ({$fields}) VALUES ({$vals})"; if (!$is_lastInsertId) { $row = $this->_db->exec($this->_sql); return $row; } else { $this->_db->exec($this->_sql); $lastId = (int)$this->_db->lastInsertId(); return $lastId; } } catch (PDOException $e) { exit($e->getMessage()); } } /** * 数据库修改操作 * @param string $tName 表名 * @param array $field 字段数组 * @param array $val 值数组 * @param string $condition 条件 * @return int 受影响的行数 */ public function update($tName,$fieldVal,$condition) { try { if (!is_array($fieldVal) || !is_string($tName) || !is_string($condition)) exit($this->getError(__FUNCTION__,__LINE__)); $tName = $this->formatTabName($tName); $upStr = ''; foreach ($fieldVal as $k=>$v) { $upStr .= '`'.$k . '`=' . '\'' . $v . '\'' . ','; } $upStr = rtrim($upStr,','); $this->_sql = "UPDATE {$tName} SET {$upStr} WHERE {$condition}"; $row = $this->_db->exec($this->_sql); return $row; } catch (PDOException $e) { exit($e->getMessage()); } } /** * 数据库删除操作(注:必须添加 where 条件) * @param string $tName 表名 * @param string $condition 条件 * @return int 受影响的行数 */ public function del($tName,$condition) { try { if (!is_string($tName) || !is_string($condition)) exit($this->getError(__FUNCTION__,__LINE__)); $tName= $this->formatTabName($tName); $this->_sql = "DELETE FROM {$tName} WHERE {$condition}"; $row = $this->_db->exec($this->_sql); return $row; } catch (PDOException $e) { exit($e->getMessage()); } } /** * 返回表总个数 * @param string $tName 表名 * @param string $condition 条件 * @return int */ public function total($tName,$condition='') { try { if (!is_string($tName)) exit($this->getError(__FUNCTION__,__LINE__)); $tName = $this->formatTabName($tName); $this->_sql = "SELECT COUNT(*) AS total FROM {$tName}" . ($condition=='' ? '' : ' WHERE ' . $condition); $re = $this->_db->query($this->_sql); foreach ($re as $v) { $total = $v['total']; } return (int)$total; } catch (PDOException $e) { exit($e->getMessage()); } } /** * 数据库删除多条数据 * @param string $tName 表名 * @param string $field 依赖字段 * @param array $ids 删除数组 * @return int 受影响的行数 */ public function delMulti($tName,$field,$ids) { try { if (!is_string($tName) || !is_array($ids)) exit($this->getError(__FUNCTION__,__LINE__)); $delStr = ''; $tName = $this->formatTabName($tName); $field = $this->formatTabName($field); foreach ($ids as $v) { $delStr .= $v . ','; } $delStr = rtrim($delStr,'); $this->_sql = "DELETE FROM {$tName} WHERE {$field} IN ({$delStr})"; $row = $this->_db->exec($this->_sql); return $row; } catch (PDOException $e) { exit($e->getMessage()); } } /** * 获取表格的最后主键(注:针对 INT 类型) * @param string $tName 表名 * @return int */ public function insertId($tName) { try { if (!is_string($tName)) exit($this->getError(__FUNCTION__,__LINE__)); $this->_sql = "SHOW TABLE STATUS LIKE '{$tName}'"; $result = $this->_db->query($this->_sql); $insert_id = 0; foreach ($result as $v) { $insert_id = $v['Auto_increment']; } return (int)$insert_id; } catch (PDOException $e) { exit($e->getMessage()); } } /** * 检查数据是否已经存在(依赖条件) * @param string $tName 表名 * @param string $field 依赖的字段 * @return bool */ public function exists($tName,__LINE__)); $tName = $this->formatTabName($tName); $this->_sql = "SELECT COUNT(*) AS total FROM {$tName} WHERE {$condition}"; $result = $this->_db->query($this->_sql); foreach ($result as $v) { $b = $v['total']; } if ($b) { return true; } else { return false; } } catch (PDOException $e) { exit($e->getMessage()); } } /** * 检查数据是否已经存在(依赖 INT 主键) * @param string $tName 表名 * @param string $primary 主键 * @param int $id 主键值 * @return bool */ public function existsByPK($tName,$primary,$id) { try { if (!is_string($tName) || !is_string($primary) || !is_int($id)) exit($this->getError(__FUNCTION__,__LINE__)); $tName = $this->formatTabName($tName); $this->_sql = "SELECT COUNT(*) AS total FROM {$tName} WHERE {$primary} = ". $id; $result = $this->_db->query($this->_sql); foreach ($result as $v) { $b = $v['total']; } if ($b) { return true; } else { return false; } } catch (PDOException $e) { exit($e->getMessage()); } } /** * 预处理删除(注:针对主键为 INT 类型,推荐使用) * @param string $tName 表名 * @param string $primary 主键字段 * @param int or array or string $ids 如果是删除一条为 INT,多条为 array,删除一个范围为 string * @return int 返回受影响的行数 */ public function delByPK($tName,$ids,$mult=FALSE) { try { if (!is_string($tName) || !is_string($primary) || (!is_int($ids) && !is_array($ids) && !is_string($ids)) || !is_bool($mult)) exit($this->getError(__FUNCTION__,__LINE__)); $tName = $this->formatTabName($tName); $stmt = $this->_db->prepare("DELETE FROM {$tName} WHERE {$primary}=?"); if (!$mult) { $stmt->bindParam(1,$ids); $row = $stmt->execute(); } else { if (is_array($ids)) { $row = 0; foreach ($ids as $v) { $stmt->bindParam(1,$v); if ($stmt->execute()) { $row++; } } } elseif (is_string($ids)) { if (!strpos($ids,'-')) exit($this->getError(__FUNCTION__,__LINE__)); $split = explode('-',$ids); if (count($split)!=2 || $split[0]>$split[1]) exit($this->getError(__FUNCTION__,__LINE__)); $i = null; $count = $split[1]-$split[0]+1; for ($i=0; $i<$count; $i++) { $idArr[$i] = $split[0]++; } $idStr = ''; foreach ($idArr as $id) { $idStr .= $id . ','; } $idStr = rtrim($idStr,'); $this->_sql ="DELETE FROM {$tName} WHERE {$primary} in ({$idStr})"; $row = $this->_db->exec($this->_sql); } } return $row; } catch (PDOException $e) { exit($e->getMessage()); } } /** * 返回单个字段数据或单条记录 * @param string $tName 表名 * @param string $condition 条件 * @param string or array $fields 返回的字段,认是* * @return string || array */ public function getRow($tName,$condition='',$fields="*") { try { if (!is_string($tName) || !is_string($condition) || !is_string($fields) || empty($fields)) exit($this->getError(__FUNCTION__,__LINE__)); $tName = $this->formatTabName($tName); $this->_sql = "SELECT {$fields} FROM {$tName} "; $this->_sql .= ($condition=='' ? '' : "WHERE {$condition}") . " LIMIT 1"; $sth = $this->_db->prepare($this->_sql); $sth->execute(); $result = $sth->fetch(PDO::FETCH_ASSOC); if ($fields === '*') { return $result; } else { return $result[$fields]; } } catch (PDOException $e) { exit($e->getMessage()); } } /** * 返回多条数据 * @param string $tName 表名 * @param string $fields 返回字段,认为* * @param string $condition 条件 * @param string $order 排序 * @param string $limit 显示个数 * @return PDOStatement */ public function getAll($tName,$fields='*',$order='',$limit='') { try { if (!is_string($tName) || !is_string($fields) || !is_string($condition) || !is_string($order) || !is_string($limit)) exit($this->getError(__FUNCTION__,__LINE__)); $tName = $this->formatTabName($tName); $fields = ($fields=='*' || $fields=='') ? '*' : $fields; $condition = $condition=='' ? '' : " WHERE ". $condition ; $order = $order=='' ? '' : " ORDER BY ". $order; $limit = $limit=='' ? '' : " LIMIT ". $limit; $this->_sql = "SELECT {$fields} FROM {$tName} {$condition} {$order} {$limit}"; $sth = $this->_db->prepare($this->_sql); $sth->execute(); $result = $sth->fetchAll(PDO::FETCH_ASSOC); return $result; } catch (PDOException $e) { exit($e->getMessage()); } } /** * 格式化数组(表结构和值) * @param array $field * @param bool $isField * @return string */ private function formatArr($field,$isField=TRUE) { if (!is_array($field)) exit($this->getError(__FUNCTION__,__LINE__)); $fields = ''; if ($isField) { foreach ($field as $v) { $fields .= '`'.$v.'`,'; } } else { foreach ($field as $v) { $fields .= '\''.$v.'\''.','; } } $fields = rtrim($fields,'); return $fields; } /** * 格式化问号 * @param int $count 数量 * @return string 返回格式化后的字符串 */ private function formatMark($count) { $str = ''; if (!is_int($count)) exit($this->getError(__FUNCTION__,__LINE__)); if ($count==1) return '?'; for ($i=0; $i<$count; $i++) { $str .= '?,'; } return rtrim($str,'); } /** * 错误提示 * @param string $fun * @return string */ private function getError($fun,$line) { return __CLASS__ . '->' . $fun . '() line ERROR!'; } /** * 处理表名 * @param string $tName * @return string */ private function formatTabName($tName) { return '`' . trim($tName,'`') . '`'; } /** * 析构方法 */ public function __destruct() { $this->_db = null; } }

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。

版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。

相关推荐