我正在检查我们的系统是否有死产品。由于物品的数量（100.000 多件衣服），我循环遍历整个 DB-Table 100。
检查一组 100 个项目后，我输出一条消息，显示已过去的时间。
问题：不知何故，它总是停在 2400-2500（见下文）。
你知道问题可能出在哪里吗？
也许增量是问题？
这是代码：
// get the amount of all rows to enable pagination later
$AllRowsResponse = mysql_query("SELECT COUNT(*) AS Count FROM ".$targettablename." WHERE 1") or die ("Error #111231".mysql_error());
mysql_close($conn);
// write amount of rows into variable
$AllRows = mysql_fetch_array($AllRowsResponse) or die (mysql_error());
$RowCount = $AllRows["Count"];
//print "<br>all rows in table: " . $RowCount ;flush();
print "<br><h1>CHECKING ".$TargetTable." FOR DEAD PRODUCTS</h1><br>";
$deletedprods = 0; // set up counter for deleted product
$i = 0; // counter
$increment = 100; // increment steps
$timetotalstart = microtime(true); // variable to measure each requests time. this is the beginning time
$md5deadimage1 = md5(file_get_contents("www.mydomain.com/dead1.jpg")); // get md5 of "not available" pic ONCE
$RowsMinusDeleted = $RowCount - $deletedprods; // when deleting a prod, dont look for rows that arent there anymore
while ( $i <= $RowsMinusDeleted) { // as long as the counter is below the rowcount, there are still rows to check
$limitstart = $i;
$limitend = $i + $increment; //MAYBE PROBLEM IS HERE???
$conn = ConnectToDB();
$ProductIds = mysql_query("SELECT ProductId,Image,Deeplink FROM ".$targettablename." WHERE 1 LIMIT " . $limitstart . "," . $limitend) or die ("Error #11124".mysql_error());
mysql_close($conn);
$i = $i + $increment; // increase the counter by the above defined increment
//print " DEAD-MD5:" & $md5deadimage1;flush();
print "<br>(Checking items " . $limitstart . "-" . $limitend . "(of ". $RowCount . " total))";flush();
//$rowCount = mysql_num_rows($ProductIds);
//print "<br>amount of ids etc in array: " . count($rowCount) ;flush();
$timeloopstart = microtime(true);
// write every productId into an array
while ( $row = mysql_fetch_array ( $ProductIds ) ) {
// get md5 of current product image
$md5deadimage2 = md5(file_get_contents($row['Image']));
if ($md5deadimage1 == $md5deadimage2) { // if current file md5 is equal to any "dead picture", show it/delete it
$deletedprods++;
$conn = ConnectToDB();
print "<a href=\"".$row['Deeplink']."\" target='_blank'><img src=\"".$row['Image']."\"></a>";flush();
mysql_query("DELETE FROM ".$targettablename." WHERE `ProductId`=".$row['ProductId']."") or die ("Error #11125".mysql_error());
mysql_close($conn);
}
//} // end if
$RowsMinusDeleted = $RowCount - $deletedprods;
} // end while
$timeloopend = microtime(true);
$timelooptotal = $timeloopend - $timeloopstart;
print "<-- above took " . floor($timelooptotal) . " seconds";
}
$timetotalend = microtime(true);
$timetotal = $timetotalend - $timetotalstart;
print "<h2> whole request took " . floor($timelooptotal / 60 ) . " minutes";
print "\n<h2>Updated ".$TargetTable.". Deleted <b>".$deletedprods."</b> old products</h2>";
这是我的脚本的作用：
CHECKING dresses FOR DEAD PRODUCTS
(Checking items 0-100(of 134902 total))<-- above took 17 seconds
(Checking items 100-200(of 134902 total))<-- above took 34 seconds
(Checking items 200-300(of 134902 total))<-- above took 48 seconds
(Checking items 300-400(of 134902 total))<-- above took 68 seconds
(Checking items 400-500(of 134902 total))<-- above took 82 seconds
(Checking items 500-600(of 134902 total))<-- above took 94 seconds
(Checking items 600-700(of 134902 total))<-- above took 109 seconds
(Checking items 700-800(of 134902 total))<-- above took 125 seconds
(Checking items 800-900(of 134902 total))<-- above took 136 seconds
(Checking items 900-1000(of 134902 total))<-- above took 146 seconds
(Checking items 1000-1100(of 134902 total))<-- above took 162 seconds
(Checking items 1100-1200(of 134902 total))<-- above took 185 seconds
(Checking items 1200-1300(of 134902 tota l))<-- above took 199 seconds
(Checking items 1300-1400(of 134902 total))<-- above took 212 seconds
(Checking items 1400-1500(of 134902 total))<-- above took 237 seconds
(Checking items 1500-1600(of 134902 total))<-- above took 277 seconds
(Checking items 1600-1700(of 134902 total))<-- above took 287 seconds
(Checking items 1700-1800(of 134902 total))<-- above took 292 seconds
(Checking items 1800-1900(of 134902 total))<-- above took 304 seconds
(Checking items 1900-2000(of 134902 total))<-- above took 305 seconds
(Checking items 2000-2100(of 134902 total))<-- above took 337 seconds
(Checking items 2100-2200(of 134902 total))<-- above took 393 seconds
(Checking items 2200-2300(of 134902 total))<-- above took 368 seconds
(Checking items 2300-2400(of 134902 total))<-- above took 375 seconds
(Checking items 2400-2500(of 134902 total))