我想请从MySQL表容量的最大值和最小值,但每当我尝试,我得到以下错误:警告:当只有一个指定参数,它必须是一个数组
Warning: min(): When only one parameter is given, it must be an array in /campus/campus.php on line 38 Call Stack: 0.0003 352296 1. {main}() /campus/campus.php:0 0.0124 1654304 2. min() /campus/campus.php:38 Warning: max(): When only one parameter is given, it must be an array in /campus/campus.php on line 39 Call Stack: 0.0003 352296 1. {main}() /campus/campus.php:0 0.0125 1654360 2. max() /campus/campus.php:39
这里我正在使用的代码:
$sql= "SELECT MIN(capacity), MAX(capacity) FROM room";
$res =& $db->query($sql);
if (PEAR::isError($res)) {
die($res->getMessage());
}
while($row = $res->fetchRow())
{
$minCapacity = $row[MIN(capacity)];
$maxCapacity = $row[MAX(capacity)];
}
echo $minCapacity;
echo $maxCapacity;
没有什么从表中返回和变量$ minCapacity和$ MAXCAPACITY为0 – CJS 2012-03-22 14:56:48
然后做了'的var_dump ($ row)'看看你从fetch调用中得到了什么 – 2012-03-22 14:59:07
在代码中我应该放置var_dump($ row)? – CJS 2012-03-22 15:01:03