php中PDO方式实现数据库的增删改查

需要开启php的pdo支持，php5.1以上版本支持实现数据库连接单例化，有三要素静态变量、静态

需要开启php的pdo支持，php5.1以上版本支持

实现数据库连接单例化，有三要素 静态变量、静态实例化方法、私有构造函数 DPDO.php

class DPDO{
 private $DSN;
 private $DBUser;
 private $DBPwd;
 private $longLink;
 private $pdo;
 //私有构造函数 防止被直接实例化
 private function __construct($dsn, $DBUser, $DBPwd, $longLink = false) {
 $this->DSN = $dsn;
 $this->DBUser = $DBUser;
 $this->DBPwd = $DBPwd;
 $this->longLink = $longLink;
 $this->connect();
 }
 //私有 空克隆函数 防止被克隆
 private function __clone(){}
 //静态 实例化函数 返回一个pdo对象
 static public function instance($dsn, $DBUser, $DBPwd, $longLink = false){
 static $singleton = array();//静态函数 用于存储实例化对象
 $singIndex = md5($dsn . $DBUser . $DBPwd . $longLink);
 if (empty($singleton[$singIndex])) {
 $singleton[$singIndex] = new self($dsn, $DBUser, $DBPwd, $longLink = false);
 }
 return $singleton[$singIndex]->pdo;
 }
 
 private function connect(){
 try{
 if($this->longLink){
 $this->pdo = new PDO($this->DSN, $this->DBUser, $this->DBPwd, array(PDO::ATTR_PERSISTENT => true));
 }else{
 $this->pdo = new PDO($this->DSN, $this->DBUser, $this->DBPwd);
 }
 $this->pdo->query('SET NAMES UTF-8');
 } catch(PDOException $e) {
 die('Error:' . $e->getMessage() . '<br/>');
 }
 }
}

用于处理字段映射，使用pdo的字段映射，可以有效避免sql注入

//字段关联数组处理， 主要用于写入和更新数据、同and 或 or 的查询条件，产生sql语句和映射字段的数组
 public function FDFields($data, $link = ',', $judge = array(), $aliasTable = ''){
 $sql = '';
 $mapData = array();
 foreach($data as $key => $value) {
 $mapIndex = ':' . ($link != ',' ? 'c' : '') . $aliasTable . $key;
 $sql .= ' ' . ($aliasTable ? $aliasTable . '.' : '') . '`' . $key . '` ' . ($judge[$key] ? $judge[$key] : '=') . ' ' . $mapIndex . ' ' . $link;
 $mapData[$mapIndex] = $value;
 }
 $sql = trim($sql, $link);
 return array($sql, $mapData);
 }
 //用于处理单个字段处理
 public function FDField($field, $value, $judge = '=', $preMap = 'cn', $aliasTable = '') {
 $mapIndex = ':' . $preMap . $aliasTable . $field;
 $sql = ' ' . ($aliasTable ? $aliasTable . '.' : '') . '`' . $field . '`' . $judge . $mapIndex;
 $mapData[$mapIndex] = $value;
 return array($sql, $mapData);
 }
 //使用刚方法可以便捷产生查询条件及对应数据数组
 public function FDCondition($condition, $mapData) {
 if(is_string($condition)) {
 $where = $condition;
 } else if (is_array($condition)) {
 if($condition['str']) {
 if (is_string($condition['str'])) {
 $where = $condition['str'];
 } else {
 return false;
 }
 }
 if(is_array($condition['data'])) {
 $link = $condition['link'] ? $condition['link'] : 'and';
 list($conSql, $mapConData) = $this->FDFields($condition['data'], $link, $condition['judge']);
 if ($conSql) {
 $where .= ($where ? ' ' . $link : '') . $conSql;
 $mapData = array_merge($mapData, $mapConData);
 }
 }
 }
 return array($where, $mapData);
 }

增删改查的具体实现DB.php

public function fetch($sql, $searchData = array(), $dataMode = PDO::FETCH_ASSOC, $preType = array(PDO::ATTR_CURSOR => PDO::CURSOR_FWDONLY)) {
 if ($sql) {
 $sql .= ' limit 1';
 $pdoStatement = $this->pdo->prepare($sql, $preType);
 $pdoStatement->execute($searchData);
 return $data = $pdoStatement->fetch($dataMode);
 } else {
 return false;
 }
 }
 
 public function fetchAll($sql, $searchData = array(), $limit = array(0, 10), $dataMode = PDO::FETCH_ASSOC, $preType = array(PDO::ATTR_CURSOR => PDO::CURSOR_FWDONLY)) {
 if ($sql) {
 $sql .= ' limit ' . (int) $limit[0] . ',' . (intval($limit[1]) > 0 ? intval($limit[1]) : 10);
 $pdoStatement = $this->pdo->prepare($sql, $preType);
 $pdoStatement->execute($searchData);
 return $data = $pdoStatement->fetchAll($dataMode);
 } else {
 return false;
 }
 }
 
 public function insert($tableName, $data, $returnInsertId = false, $replace = false) {
 if(!empty($tableName) && count($data) > 0){
 $sql = $replace ? 'REPLACE INTO ' : 'INSERT INTO ';
 list($setSql, $mapData) = $this->FDFields($data);
 $sql .= $tableName . ' set ' . $setSql;
 $pdoStatement = $this->pdo->prepare($sql, array(PDO::ATTR_CURSOR => PDO::CURSOR_FWDONLY));
 $execRet = $pdoStatement->execute($mapData);
 return $execRet ? ($returnInsertId ? $this->pdo->lastInsertId() : $execRet) : false;
 } else {
 return false;
 }
 }
 
 public function update($tableName, $data, $condition, $mapData = array(), $returnRowCount = true) {
 if(!empty($tableName) && count($data) > 0) {
 $sql = 'UPDATE ' . $tableName . ' SET ';
 list($setSql, $mapSetData) = $this->FDFields($data);
 $sql .= $setSql;
 $mapData = array_merge($mapData, $mapSetData);
 list($where, $mapData) = $this->FDCondition($condition, $mapData);
 $sql .= $where ? ' WHERE ' . $where : '';
 $pdoStatement = $this->pdo->prepare($sql, array(PDO::ATTR_CURSOR => PDO::CURSOR_FWDONLY));
 $execRet = $pdoStatement->execute($mapData);
 return $execRet ? ($returnRowCount ? $pdoStatement->rowCount() : $execRet) : false;
 } else {
 return false;
 }
 }
 
 public function delete($tableName, $condition, $mapData = array()) {
 if(!empty($tableName) && $condition){
 $sql = 'DELETE FROM ' . $tableName;
 list($where, $mapData) = $this->FDCondition($condition, $mapData);
 $sql .= $where ? ' WHERE ' . $where : '';
 $pdoStatement = $this->pdo->prepare($sql, array(PDO::ATTR_CURSOR => PDO::CURSOR_FWDONLY));
 $execRet = $pdoStatement->execute($mapData);
 return $execRet;
 }
 }

测试文件test.php

header("Content-type: text/html; charset=utf-8");
define('APP_DIR', dirname(__FILE__));
 
if (function_exists('spl_autoload_register')) {
 spl_autoload_register('autoClass');
} else {
 function __auto_load($className){
 autoClass($className);
 }
}
 
function autoClass($className){
 try{
 require_once APP_DIR.'/class/'.$className.'.php';
 } catch (Exception $e) {
 die('Error:' . $e->getMessage() . '<br />');
 }
}
$DB = new DB();
//插入
$inData['a'] = rand(1, 100);
$inData['b'] = rand(1, 1000);
$inData['c'] = rand(1,200) . '.' . rand(1,100);
$ret = $DB->insert('a', $inData);
echo '插入' . ($ret ? '成功' : '失败') . '<br/>';
//更新
$upConData['a'] = 100;
$upConJudge['a'] = '<';
$upConData['b'] = 30;
$upConJudge['b'] = '>';
list($upConStr, $mapUpConData) = $DB->FDField('b', 200, '<', 'gt');
$condition = array(
 'str' => $upConStr,
 'data' => $upConData,
 'judge' => $upConJudge,
 'link' => 'and'
);
$upData['a'] = rand(1, 10);
$upData['b'] = 1;
$upData['c'] = 1.00;
$changeRows = $DB->update('a', $upData, $condition, $mapUpConData);
echo '更新行数:' . (int) $changeRows . '<br/>';
//删除
$delVal = rand(1, 10);
list($delCon, $mapDelCon) = $DB->FDField('a', $delVal);
$delRet = $DB->delete('a', $delCon, $mapDelCon);
echo '删除a=' . $delVal . ($delRet ? '成功' : '失败') . '<br/>';
 
//查询
$data['a'] = '10';
$judge['a'] = '>';
$data['b'] = '400';
$judge['b'] = '<';
list($conSql, $mapConData) = $DB->FDFields($data, 'and', $judge);
$mData = $DB->fetch('select * from a where ' . $conSql . ' order by `a` desc', $mapConData);
 
var_dump($mData);

以上所述就是本文的全部内容了，希望大家能够喜欢。

php pdo连接数据库 数据库增删改查