<?php
namespace Helpers;

use \Helpers\View as view;

class dbh
{
	private $db;				//传入PDO对象.
	private $product = 0;		//产品环境
	
	public $debug = 0;
	
	function __construct($db = NULL)
	{
		if(empty($db))
		{
			$this->db = \Zend_Registry::get('db');
		}else{
			$this->db = $db;
		}
	}
	
	function insert($table,$data,$return=false)
	{
		$fields = array();
		$datas = array();
		
		foreach($data as $k=>$v)
		{
			$fields[] = '"'.$k.'"';
			if(is_int($v) || is_float($v) || is_bool($v))
			{
				$datas[] = $v;
			}else{
				if(preg_match("/\'/",$v))
				{
					$v = preg_replace("/\'/","''",$v);
				}
				$datas[] = "'".$v."'";
			}
		}
		
		$fields = join(",",$fields);
		$datas = join(",",$datas);
		
		if($return == false){
			$sql = "INSERT INTO \"".$table."\" ($fields) VALUES ($datas)";
			
			if($this->debug == 1)
			{
				view::Dump($sql,false);
			}
			
			try{
				return $this->db->exec($sql);
			}catch (Exception $e) {
				if($this->product)
				{
					return false;
				}else{
					echo 'Caught exception: '.  $e->getMessage(). "\n";
				}
			}
		}else{
			$sql = "INSERT INTO \"".$table."\" ($fields) VALUES ($datas) RETURNING id";
			
			if($this->debug == 1)
			{
				view::Dump($sql,false);
			}
			
			try{
				$sth = $this->db->prepare($sql);
				if($sth->execute())
				{
					$temp = $sth->fetch(\PDO::FETCH_ASSOC);
					return $temp['id'];
				}else{
					return false;
				}
			}catch (Exception $e) {
				if($this->product)
				{
					return false;
				}else{
					echo 'Caught exception: '.  $e->getMessage(). "\n";
				}
			}
		}
	}//insert
	
	function update($table,$data,$condition="",$return=false)
	{
		$ups = array();
		
		foreach($data as $k=>$v)
		{
			if(is_int($v) || is_float($v) || is_bool($v))
			{
				$ups[] = '"'.$k.'"='.$v;
			}else{
				if(preg_match("/\'/",$v))
				{
					$v = preg_replace("/\'/","''",$v);
				}
				if(preg_match("/\"/",$v))
				{
					$v = preg_replace("/\"/","''",$v);
				}
				$ups[] = '"'.$k.'"=\''.$v."'";
			}
		}
		
		$fields = join(",",$ups);
		
		if(!empty($condition))
		{
			$wheresql = " WHERE ".$condition;
		}else{
			$wheresql = "";
		}
		
		if($return == false){
			
			try{
				$sql = "UPDATE \"".$table."\" SET $fields $wheresql";
				
				if($this->debug == 1)
				{
					view::Dump($sql,false);
				}
				
				if($this->db->exec($sql))
				{
					return true;
				}else{
					return false;
				}
			}catch (Exception $e) {
				if($this->product)
				{
					return false;
				}else{
					echo 'Caught exception: '.  $e->getMessage(). "\n";
				}
			}
		}else{
			try{
				$sql = "UPDATE \"".$table."\" SET $fields $wheresql";
				
				if($this->debug == 1)
				{
					view::Dump($sql,false);
				}
				
				return $this->db->exec($sql);
			}catch (Exception $e) {
				if($this->product)
				{
					return false;
				}else{
					echo "<pre>";
					echo $sql."\r\n";
					echo 'Caught exception: '.  $e->getMessage(). "\r\n";
					echo "</pre>";
				}
			}
		}

	}//update
	
	//select
	public function select($opt,$debug = false)
	{
		$field = (isset($opt['field']) && !empty($opt['field'])) ? $opt['field']:"*";
		$tbl = (isset($opt['table']) && !empty($opt['table'])) ? $opt['table'] : "";
		$join = (isset($opt['join']) && !empty($opt['join'])) ? $opt['join'] : "";
		$wheresql = (isset($opt['where']) && !empty($opt['where'])) ? " WHERE ".$opt['where']:" ";
		$limit = (isset($opt['limit']) && !empty($opt['limit'])) ? " LIMIT ".$opt['limit']:"";
		$offset = (isset($opt['start']) && !empty($opt['start'])) ? " OFFSET ".$opt['start']:"";
		$order = (isset($opt['order']) && !empty($opt['order'])) ? " ORDER BY ".$opt['order']:"";
		$order .= (isset($opt['sort']) && !empty($opt['sort']) && $order !== '') ? " ".$opt['sort']:"";
		$sql = "SELECT $field FROM $tbl
				" . $join . "
				" . $wheresql . " 
				" . $order . "
				" . $limit . "
				" . $offset . "
				";
		if($debug) return $sql;
		
		$rs = $this->db->query($sql);
		return $rs->fetchAll();
	}
	
	public function chk($p)
	{
		if(!isset($p) || empty($p))
		{
			return false;
		}else{
			return true;
		}
	}
	
}