在mysqli/php代码中添加2个SELECT查询会导致错误
我在下面有一个php/mysqli代码,它可以成功地插入问题和答案:在mysqli/php代码中添加2个SELECT查询会导致错误,php,mysqli,Php,Mysqli,我在下面有一个php/mysqli代码,它可以成功地插入问题和答案: $i = 0; $c = count($_POST['numQuestion']); $questionsql = "INSERT INTO Question (SessionId, QuestionId, QuestionContent) VALUES (?, ?, ?)"; $sessid = $_SESSION['id'] . ($_SESSION['i
$i = 0;
$c = count($_POST['numQuestion']);
$questionsql = "INSERT INTO Question (SessionId, QuestionId, QuestionContent)
VALUES (?, ?, ?)";
$sessid = $_SESSION['id'] . ($_SESSION['initial_count'] > 1 ? $_SESSION['sessionCount'] : '');
if (!$insert = $mysqli->prepare($questionsql)) {
// Handle errors with prepare operation here
} else{
for($i = 0; $i < $c; $i++ ){
$results = $_POST['value'];
foreach($results as $id => $value) {
$answer = $value;
$insert->bind_param("sis", $sessid, $id, $_POST['questionText'][$i]);
$insert->execute();
if ($insert->errno) {
// Handle query error here
}
$lastID = $insert->insert_id;
$insert->close();
foreach($value as $answer) {
$answersql = "INSERT INTO Answer (SessionId, QuestionId, Answer)
VALUES (?, ?, ?)";
if (!$insertanswer = $mysqli->prepare($answersql)) {
// Handle errors with prepare operation here
}
$insertanswer->bind_param("sis", $sessid, $lastID, $answer);
$insertanswer->execute();
if ($insertanswer->errno) {
// Handle query error here
}
$insertanswer->close();
}
}
}
}
这里发生了两个不同的问题。首先,
命令不同步
警告正在发生,因为您试图在实际完成以前的查询之前启动新的查询。有关详细信息,请参阅。基本上,在准备下一个查询之前,您必须关闭正在准备的每个查询
至于无法中断/继续
错误,发生这种情况的原因是,当您只有1层深度时,您正在调用中断2
。中断
(或继续
)后的可选数字是要中断的“级别”数
<?php
for($i = 0; $i < 10; $i++){
// 1 level
for($j = 0; $j < 10; $j++){
// 2 levels
break; // Break of the $j loop
break 1; // Equivalent to above
break 2; // Break out of both the $j and $i loops
break 3; // Causes an error - there is no third level
}
}
<?php
for($i = 0; $i < 10; $i++){
// 1 level
for($j = 0; $j < 10; $j++){
// 2 levels
break; // Break of the $j loop
break 1; // Equivalent to above
break 2; // Break out of both the $j and $i loops
break 3; // Causes an error - there is no third level
}
}