我要么失去了情节，要么有人在玩我的想法：/
我已将此代码与我的应用程序的其余部分分开以尝试调试，也为了便于阅读而硬编码$ guideid。
我有以下代码（此脚本中没有其他内容作为测试，即没有其他查询）：
<?php
define("DB_HOST", "127.0.0.1");
define("DB_NAME", "xxxxx");
define("DB_USER", "xxxxx");
define("DB_PASS", "xxxxx");
$mysqli = new mysqli(DB_HOST, DB_USER, DB_PASS, DB_NAME);
$stmt = $mysqli->prepare("SELECT `guides_listings`.`listing_id`, `guide_slug`, `guide_name_en`, listing_name, `listing_slug`, `slogo`.`filename` AS `slogoname`, `hlogo`.`filename` AS `hlogoname`, `vlogo`.`filename` AS `vlogoname`
FROM `guides_listings`
JOIN `guides` ON `guides_listings`.`listing_guide` = `guides`.`guide_id`
LEFT JOIN `guides_listings_pics` AS `slogo`
ON `slogo`.`listing_id` = `guides_listings`.`listing_id`
AND `slogo`.`type` = 'slogo'
LEFT JOIN `guides_listings_pics` AS `hlogo`
ON `hlogo`.`listing_id` = `guides_listings`.`listing_id`
AND `hlogo`.`type` = 'hlogo'
LEFT JOIN `guides_listings_pics` AS `vlogo`
ON `vlogo`.`listing_id` = `guides_listings`.`listing_id`
AND `vlogo`.`type` = 'vlogo'
WHERE (`slogo`.`filename` IS NOT NULL OR `hlogo`.`filename` IS NOT NULL OR `vlogo`.`filename` IS NOT NULL)
AND `guides_listings`.`listing_guide` = ?
GROUP BY `guides_listings`.`listing_id`
ORDER BY RAND()
LIMIT 12");
$stmt->bind_param("i",$guideid);
$guideid = 2;
$stmt->execute();
$stmt->bind_result($listing_id,$guide_slug,$guide_name,$listing_name,$listing_slug,$slogo,$hlogo,$vlogo);
while($stmt->fetch()) {
$results->data[] = array('listing_id'=>$listing_id,'guide_slug'=>$guide_slug,'guide_name'=>$guide_name,'listing_name'=>$listing_name,'listing_slug'=>$listing_slug,'slogo'=>$slogo,'hlogo'=>$hlogo,'vlogo'=>$vlogo);
}
$stmt->close();
?>
执行（）
后会产生Commands out of sync; you can't run this command now
但是仍然会返回正确的结果。
我是否遗漏了一些明显的原因，为什么它仍然可以发出此错误？
修改
我刚刚进行了一些测试，这似乎发生在所有准备好的查询中，请参阅下面的示例：
$mysqli = new mysqli(DB_HOST, DB_USER, DB_PASS, DB_NAME);
$stmt = $mysqli->stmt_init();
$stmt->prepare("SELECT `listing_id` FROM `guides_listings` LIMIT 1");
$stmt->execute();
print_r($mysqli);
$stmt->bind_result($listing_id);
$stmt->fetch();
$results->data[] = array('listing_id'=>$listing_id);
$stmt->close();
print_r导致：
mysqli Object
(
[affected_rows] => -1
[client_info] => 5.6.21
[client_version] => 50621
[connect_errno] => 0
[connect_error] =>
[errno] => 0
[error] =>
[error_list] => Array
(
)
[field_count] => 1
[host_info] => 127.0.0.1 via TCP/IP
[info] =>
[insert_id] => 0
[server_info] => 5.6.21
[server_version] => 50621
[stat] => Commands out of sync; you can't run this command now
[sqlstate] => HY000
[protocol_version] => 10
[thread_id] => 19462371
[warning_count] => 0
)
也许我真的在看这里的错误？
答案 0 :(得分：1)
在绑定之前分配$guideid。
尝试在$stmt->store_result()和execute()之间致电bind_result()。
看起来$stmt实际上并未定义。通常我会$stmt = mysqli->prepare(...)
答案 1 :(得分：1)
$mysqli = new mysqli(DB_HOST, DB_USER, DB_PASS, DB_NAME);
if ($stmt= $mysqli->query("SELECT `listing_id` FROM `guides_listings` LIMIT 1")) {
$stmt->bind_result($listing_id);
$stmt->fetch();
echo "listing_id = ". $listing_id;
$stmt->close();
}else{
printf("Error: %s\n", $mysqli->error);
}
$mysqli->close();
$mysqli = new mysqli(DB_HOST, DB_USER, DB_PASS, DB_NAME);
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
$query = "SELECT `listing_id` FROM `guides_listings` LIMIT 1";
if ($stmt = $mysqli->prepare($query)) {
$stmt->execute();
/* store result */
$stmt->store_result();
if($stmt->num_rows > 0){
$stmt->bind_result($listing_id);
if ($stmt->fetch()) {
echo "listing_id = ". $listing_id;
}
}
/* free result */
$stmt->free_result();
$stmt->close();
}else{
/*failed to prepare*/
printf("Error: %s\n", $mysqli->error);
}
$mysqli->close();
<?php
define("DB_HOST", "127.0.0.1");
define("DB_NAME", "xxxxx");
define("DB_USER", "xxxxx");
define("DB_PASS", "xxxxx");
$mysqli = new mysqli(DB_HOST, DB_USER, DB_PASS, DB_NAME);
if ($mysqli->connect_errno) {
printf("Connect failed: %s\n", $mysqli->connect_error);
exit();
}
$query = "
SELECT `guides_listings`.`listing_id`,
`guide_slug`,
`guide_name_en`,
listing_name,
`listing_slug`,
`slogo`.`filename` AS `slogoname`,
`hlogo`.`filename` AS `hlogoname`,
`vlogo`.`filename` AS `vlogoname`
FROM `guides_listings`
JOIN `guides`
ON `guides_listings`.`listing_guide` = `guides`.`guide_id`
LEFT JOIN `guides_listings_pics` AS `slogo`
ON `slogo`.`listing_id` = `guides_listings`.`listing_id`
AND `slogo`.`type` = 'slogo'
LEFT JOIN `guides_listings_pics` AS `hlogo`
ON `hlogo`.`listing_id` = `guides_listings`.`listing_id`
AND `hlogo`.`type` = 'hlogo'
LEFT JOIN `guides_listings_pics` AS `vlogo`
ON `vlogo`.`listing_id` = `guides_listings`.`listing_id`
AND `vlogo`.`type` = 'vlogo'
WHERE ( `slogo`.`filename` IS NOT NULL
OR `hlogo`.`filename` IS NOT NULL
OR `vlogo`.`filename` IS NOT NULL )
AND `guides_listings`.`listing_guide` = ?
GROUP BY `guides_listings`.`listing_id`
ORDER BY Rand()
LIMIT 12
";
$guideid = 2;
if ($stmt = $mysqli->prepare($query)) {
$stmt->bind_param("i", $guideid);
$stmt->execute();
$stmt->store_result();
$stmt->bind_result($listing_id,$guide_slug,$guide_name,$listing_name,
$listing_slug,$slogo,$hlogo,$vlogo);
$results= array();
while($stmt->fetch()) {
$results[] = array(
'listing_id'=>$listing_id,'guide_slug'=>$guide_slug,
'guide_name'=>$guide_name,'listing_name'=>$listing_name,
'listing_slug'=>$listing_slug,'slogo'=>$slogo,
'hlogo'=>$hlogo,'vlogo'=>$vlogo
);
}
$stmt->free_result();
$stmt->close();
}else{
$results[] = array("Error:" => $stmt->error);
}
/* close connection */
$mysqli->close();
/* Output results in JSON*/
echo json_encode($results);