问题描述
我对PHP和MySQL还是很陌生,我只是想不通.我搜索了整个论坛,但没有找到我能理解的答案.我最初使用的是mysql_fetch_assoc(),但我只能搜索数字,并且在搜索字母时也收到错误.我希望我在正确的轨道上.预先感谢您的所有帮助!
I am pretty new to PHP and MySQL and I just can't figure this one out. I have searched all around the forum but haven't found an answer I can make sense of. I originally was using mysql_fetch_assoc() but I could only search numbers and I received errors when searching for letters as well. I hope I am on the right track here. Thank you in advance for all your help!
$con = mysqli_connect($hostname,$username,$password) or die ("<script language='javascript'>alert('Unable to connect to database')</script>");
mysqli_select_db($con, $dbname);
if (isset($_GET['part'])){
$partid = $_GET['part'];
$sql = 'SELECT *
FROM $usertable
WHERE PartNumber = $partid';
$result = mysqli_query($con, $sql);
$row = mysqli_fetch_assoc($result);
$partnumber = $partid;
$nsn = $row["NSN"];
$description = $row["Description"];
$quantity = $row["Quantity"];
$condition = $row["Conditio"];
}
推荐答案
当您的结果不是结果(而是"false")时,就会发生这种情况.您应该更改此行
This happens when your result is not a result (but a "false" instead).You should change this line
$sql = 'SELECT * FROM $usertable WHERE PartNumber = $partid';
对此:
$sql = "SELECT * FROM $usertable WHERE PartNumber = $partid";
因为可以解释$变量,而'不能.
because the " can interprete $variables while ' cannot.
可以很好地使用整数(数字),对于字符串,您需要将$ variable放在单引号中,例如
Works fine with integers (numbers), for strings you need to put the $variable in single quotes, like
$sql = "SELECT * FROM $usertable WHERE PartNumber = '$partid' ";
如果要/必须使用单引号,则php无法解释变量,则必须这样做:
If you want / have to work with single quotes, then php CAN NOT interprete the variables, you will have to do it like this:
$sql = 'SELECT * FROM '.$usertable.' WHERE string_column = "'.$string.'" AND integer_column = '.$number.';
这篇关于mysqli_fetch_assoc()期望参数1为mysqli_result,给定布尔值的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!