查询类方法代码分析

public static function getbak($type,$fromTime,$endTime,$pageno=1,$pagesize){
   if($pageno<1) $pageno = 1 ;//翻页函数:
  
  if($type){
   
   global $lang;
  $type = intval($type); //$type是int格式,intval防止数字溢出,假如$type是字符串(包含汉字)使用trim()删除空白符
  if(!$type) exit("$lang[plz_select_type]");
  
  if($fromTime) $fromTime = str_replace("-",'' ,substr($fromTime,0,10));把2011-01-01 14:38:59 转化成20100101格式
  else $fromTime='20080101';
  if($endTime) $endTime = str_replace("-",'' ,substr($endTime,0,10));
  else $endTime=date("Ymd",time());//条件判断输出的if(expr)else。。多个输出if(expr){。。。}else{。。。}
----------------*******************
  if($fromTime and $endTime) {
   $sqladd = " and  `day` >= '$fromTime' and `day` <= '$endTime' ";
  }elseif($fromTime){
   $sqladd = " and  `day` >= '$fromTime' ";
  }elseif($endTime){
   $sqladd = " and  `day` =< '$endTime' ";
  }
  if($uid){
   $sqladd = " and  `uid` = '$uid' ";
  }
  --------------------**************
  上面那段判读又等于下面这段:$sql后面条件的书写,认真体会:(and前面要有空格,$addsql.后面的连接符不要忘,'$fromTime'条件值一定要加单引号)
      $addsql.="where 1=1";
   ($fromTime&&$endTime)&&$addsql.=" and  `day` >= '$fromTime' and `day` <= '$endTime'";
   
   $uid&&$addsql.="and uid='$uid'";
---------------------*************************
  $sql = "select * from ".self::$_table . " where `type` = '$type'  $sqladd limit ". ($pageno-1)*$pagesize .",$pagesize" ;//翻页变量
// return $sql;打印出来
  $data = parent::get_all($sql);取出全部数据,下面把$data强制转换为array格式
  foreach((array)$data as $k=>$v) {
   $day = $v["day"];//对应二维数组,重新建立索引---时间字段
   $data1[$day]["day"] = $day;
   
   $soldierinfo='';//写把$soliderinfo写入内存,在读进数据,可以提高写入内存效率
   $soldierinfo = unserialize($v["soldierinfo"]);//反序列化,=》转化成数组,serialize序列化把数组转化成数据库可存储格式
   if(is_array($soldierinfo))//判断是否是数组,is_integer是否是整数,!empty()判断变量是否为空,isset()判断变量是否设置
   {
    foreach($soldierinfo as $k2=>$v){
     $data1[$day]["soldierinfo"][$k2] += $soldierinfo[$k2];//求各个字段的值,采用了foreach循环,而不是逐个列出,方便以后即时加字段也不需修改代码
     $data1[$day]["all"] += $v;//求各个字段的总和,使用了+=符号,自动累加
    }
   }
  }
  return $data1;
   
  }
  
  
 }
 **********——————————————————————
 对应sql语句的另外一种执行方式
     $res=mysql_query($sql);
   if(mysql_num_rows($res)<1)//判断取出数据是否存在
   return false;
   while($row=mysql_fetch_array($res)){
      $time=$row['day'];
       $return[$time]['type']=$row['type'];
       $return[$time]['day']=$row['day'];
       
      $soldierinfo='';
       $soldierinfo = unserialize($row["soldierinfo"]);
       
       if(is_array($soldierinfo)){
        foreach($soldierinfo as $k=>$v){
         $return[$time]['soldierinfo'][$k]=$soldierinfo[$k];
         $return[$time]['all']+=$v;
        }
       }
   }
   return $return;
  }
=======================
$soldierinfo打印出结果:
(Object)#0
  1 = 392276
  2 = 128176
  3 = 921
  4 = 271652
  5 = 33948
  6 = 0
  7 = 0

posted @ 2011-03-11 15:59  y0umer  阅读(169)  评论(0编辑  收藏  举报