


PHP’s PDO common class library example analysis, pdo class library example analysis
This article describes PHP’s PDO common class library with examples. Share it with everyone for your reference, the details are as follows:
1. Db.class.php connects to the database
<?php // 连接数据库 class Db { static public function getDB() { try { $pdo = new PDO(DB_DSN, DB_USER, DB_PWD); $pdo->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 database operation class
<?php /** * 数据库操作类库 * author Lee. * Last modify $Date: 2012-1-19 13:59;04 $ */ class M { private $_db; //数据库句柄 public $_sql; //SQL语句 /** * 构造方法 */ public function __construct() { $this->_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 $is_lastInsertId 是否返回添加ID * @return int 默认返回成功与否,$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, $condition) { try { if (!is_string($tName) || !is_string($condition)) exit($this->getError(__FUNCTION__, __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, $primary, $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 $fields 返回的字段,默认是* * @return string || array */ public function getRow($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,默认为* * @param string $condition 条件 * @param string $order 排序 * @param string $limit 显示个数 * @return PDOStatement */ public function getAll($tName, $fields='*', $condition='', $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<font color="red">'. $line .'</font> ERROR!'; } /** * 处理表名 * @param string $tName * @return string */ private function formatTabName($tName) { return '`' . trim($tName, '`') . '`'; } /** * 析构方法 */ public function __destruct() { $this->_db = null; } }
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。


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