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How to determine whether the query result is empty in php
- coldplay.xixiOriginal
- 2020-09-04 10:17:374795browse
php method to determine whether the query result is empty: 1. Use the sql method, the code is [select count(people) c from people where people='Lele']; 2. Use the php method, the code is [$p=$_POST['p'];].
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php method to determine whether the query result is empty:
1,
select count(people) c from people where people='乐乐'
The above sql is the principle
2,
php utilization code
<?php
$p=$_POST['p'];
$cnx = new PDO("odbc:Driver={SQL Server};Server=;Database=;",'','');
$ps=$cnx->query("select count(people) c from people where people='".$p."'");
foreach($ps as $s){
if ($s['c']=='0'){
echo "用户可用";
}else{
echo "此用户名已存在";
}
}
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