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<?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 数据库操作类<?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;}}更多关于PHP相关内容感兴趣的读者可查看本站专题:《php curl用法总结》、《PHP运算与运算符用法总结》、《PHP网络编程技巧总结》、《PHP基本语法入门教程》、《php操作office文档技巧总结(包括word,excel,access,ppt)》、《php日期与时间用法总结》、《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》
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