<?php
defined('ACC')||exit('Access Denied');
// 封裝mysql操作類,包括連接功能,及查詢功能.
class mysql extends absdb{
  protected static $ins = null;
  protected $host; // 主機名
  protected $user; // 用戶名
  protected $passwd; // 密碼
  protected $db;   // 數(shù)據(jù)庫名
  protected $port;  // 端口
  protected $conn = null;
  // 在內(nèi)部操作,獲得一個對象
  public static function getIns() {
    if(self::$ins === null) {
      self::$ins = new self();
    }
    $conf = conf::getIns();
    self::$ins->host = $conf->host;
    self::$ins->user = $conf->user;
    self::$ins->passwd = $conf->pwd;
    self::$ins->db = $conf->db;
    self::$ins->port = $conf->port;
    self::$ins->connect();
    self::$ins->select_db();
    self::$ins->setChar();
    return self::$ins;
  }
  // 不讓外部做new操作,
  protected function __construct() {
  }
  // 連接數(shù)據(jù)庫
  public function connect() {
    $this->conn = @mysql_connect($this->host,$this->user,$this->passwd,$this->port);
    if(!$this->conn) {
      $error = new Exception('數(shù)據(jù)庫連不上',9);
      throw $error;
    }
  }
  // 發(fā)送sql查詢
  public function query($sql) {
    $rs = mysql_query($sql,$this->conn);
    if(!$rs) {
      log::write($sql);
    }
    return $rs;
  }
  // 封裝一個getAll方法
  // 參數(shù):$sql
  // 返回: array,false
  public function getAll($sql) {
    $rs = $this->query($sql);
    if(!$rs) {
      return false;
    }
    $list = array();
    while($row = mysql_fetch_assoc($rs)) {
      $list[] = $row;
    }
    return $list;
  }
  // 封裝一個getRow方法
  // 參數(shù):$sql
  // 返回: array,false
  public function getRow($sql) {
    $rs = $this->query($sql);
    if(!$rs) {
      return false;
    }
    return mysql_fetch_assoc($rs);
  }
  // 封裝一個getOne方法,
  // 參數(shù): $sql
  // 返回: int,str(單一的值)
  public function getOne($sql) {
    $rs = $this->query($sql);
    if(!$rs) {
      return false;
    }
    $tmp = mysql_fetch_row($rs);
    return $tmp[0];
  }
  // 封裝一個afftect_rows()方法
  // 參數(shù):無
  // 返回 int 受影響行數(shù)
  public function affected_rows() {
    return mysql_affected_rows($this->conn);
  }
  // 返回最新生成的auto_increment列的值
  public function last_id() {
    return mysql_insert_id($this->conn);
  }
  // 選庫函數(shù)
  public function select_db() {
    $sql = 'use ' . $this->db;
    return $this->query($sql);
  }
  // 設(shè)置字符集的函數(shù)
  public function setChar() {
    $sql = 'set names utf8';
    return $this->query($sql);
  }
  // 自動生成insert語句,update語句并執(zhí)行
  public function autoExecute($data,$table,$act='insert',$where='') {
    if($act == 'insert') {
      $sql = 'insert into ' . $table . ' (';
      $sql .= implode(',',(array_keys($data)));
      $sql .= ') values (\'';
      $sql .= implode("','",array_values($data));
      $sql .= "')";
    } else if($act == 'update') {
      if(!trim($where)) {
        return false;
      }
      $sql = 'update ' . $table . ' set ';
      foreach($data as $k=>$v) {
        $sql .= $k;
        $sql .= '=';
        $sql .= "'".$v."',";
      }
      $sql = substr($sql,0,-1);
      $sql .= ' where ';
      $sql .= $where;
    } else {
      return false;
    }
    //return $sql;
    return $this->query($sql);
  }
}