/**

* 数据库连接类，DAO

*/

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() . '
');

}

}

}

/*

* @author ykm

* @date 2015.05.12

* @description database 操作实例化类

* 默认使用 关联数据 关联映射 查询

* execute 语句完成后 执行 $pdoStatement->debugDumpParams() 可以查看sql语句错误

*/

class DB {

protected $pdo;

public function __construct($dbType = 'mysql'){

require 'config.php';

if($dbType == 'mysql') {

$dsn = "mysql:host=$DB_IP;port=$DB_PORT;dbname=$DB_NAME";

}

$this->pdo = DPDO::instance($dsn, $DB_USER, $DB_PASSWORD);

}

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, 100), $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);

//echo "$sql";

$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;

}

}

//字段关联数组处理

public function FDFields($data, $link = ',', $judge = array(), $aliasTable = ''){

$sql = '';

$mapData = array();

foreach($data as $key => $value) {

$mapIndex = ':' . ($link != ',' ? 'c' : '') . $aliasTable . $key;

$sql .= ' ' . ($aliasTable ? $aliasTable . '.' : '') . '`' . $key . '` ' . (isset($judge[$key]) ? $judge[$key] : '=') . ' ' . $mapIndex . ' ' . $link;

$mapData[$mapIndex] = $value;

}

$sql = trim($sql, $link);

return array($sql, $mapData);

}

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);

}

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);

}

}

?>

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