[英]Correct syntax query insert in to table(MySql)
我知道這是mysqli,但我想知道如何正確獲取此查詢。 我想在表中插入用戶名,besvarelse和modulid。 但是,如果besvarelse為空或null,我想寫回已經准備好傳遞的消息。
$sql = "INSERT INTO oppgave(username, besvarelse, modulid)
select '$username', '$besvarelse', '$modulid'
from dual
where not exists (select modulid from oppgave where modulid='$modulid')";
$result=mysql_query($sql, $tilkobling);
if(mysql_affected_rows()==0){
echo "<h1>Allready delivered</h1>";
}else{
echo "<h1>Delivery ok</h1>";
}
?>
//«if besvarelse is empty or null i want to write back message that its allready delivered.»
//To check besvarelse we shold not use SQL, it is much better to check it with PHP
if ($besvarelse=='' or is_null($besvarelse)) {
$resp = "<h1>Allready delivered</h1>";
} else {
$sql = ......;
$result=mysql_query($sql, $tilkobling);
if(mysql_affected_rows()==0){
$resp="<h1>Allready delivered</h1>";
}else{
$resp="<h1>Delivery ok</h1>";
}
echo $resp;
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