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一个成员函数fetch_row()我试图获取MySQL查询行,但是越来越无法抓取行呼叫到布尔
Fatal error:Call to a member function fetch_row() on boolean.
我在做什么错在这里?
$select="visitor_country";
$startDate="2016-01-01";
$endDate="2016-12-31";
$groupBy="visitor_country";
$query=$connection->prepare("SELECT ?, COUNT(*) as count FROM `analytics`.`analytics` WHERE date BETWEEN ? AND ? GROUP BY ? ORDER BY count");
$query->bind_param('ssss',$select,$startDate,$endDate,$select);
$query->execute();
$result=$query->store_result();
$row = $result->fetch_row();
$num_of_rows=count($row);
echo $num_of_rows."<br>";
$query->close();
$connection->close();
'store_result()'返回一个true/false,所以这并不奇怪。即使我删除store_result(),仍然看到手册http://php.net/manual/en/mysqli-stmt.store-result.php – Qirel
@Qirel我仍然得到相同的错误。 – DAKSH
我想你想要的是'$ result = $ query-> get_result()'而不是?这将其从MySQLi转换为MySQLi结果,您可以使用'fetch_row()'。 [get_result()']手册(http://php.net/manual/en/mysqli-stmt.get-result.php)。另外,MySQLi stmt和MySQLi结果都带有一个'num_rows'属性,所以不用'count($ row)'可以执行'$ query-> num_rows' – Qirel