一次执行多个或三个查询答案

【问题标题】：Executing Multiple or Three Queries at Once一次执行多个或三个查询
【发布时间】：2016-01-17 08:50:03
【问题描述】：

我目前正在创建一个在线预订系统。

如何一次执行多个查询？

我已经在使用 mysqli_muti_query。我要执行三个查询。

<?php
$sql = "INSERT INTO db (name,picuploc,lname,pnumber,age,email,address,city,zipcode,ticketid,pickuptime,dropofftime,dropoffloc,vehicle,plateno,totalprice,date_registered) VALUES ('$first','$pickuploc','$lname','$pnumber','$age','$email','$address','$city','$zip','$ticket','$pickup','$dropoff','$dropoffloc','$car','$plate','$all', NOW());";

$sql .= "UPDATE vehicles set quantity = quantity - $age WHERE vehicle = '$car' AND parent = '$ye' ";

$sql .= "UPDATE vehicles set status = '$un'  WHERE plateno = '$plate' "; ?>

【问题讨论】：

您的第二个查询没有结束分号 - ; -> ... AND parent = '$ye'; ";

标签： php multi-query

【解决方案1】：

需要在每条语句后加分号：

<?php
$sql = "INSERT INTO db (name,picuploc,lname,pnumber,age,email,address,city,zipcode,ticketid,pickuptime,dropofftime,dropoffloc,vehicle,plateno,totalprice,date_registered) VALUES ('$first','$pickuploc','$lname','$pnumber','$age','$email','$address','$city','$zip','$ticket','$pickup','$dropoff','$dropoffloc','$car','$plate','$all', NOW());";

$sql .= "UPDATE vehicles set quantity = quantity - $age WHERE vehicle = '$car' AND parent = '$ye' ;";

$sql .= "UPDATE vehicles set status = '$un'  WHERE plateno = '$plate' ;";

【讨论】：

最后一个查询末尾的分号是不需要的，实际上可能会导致查询失败-php.net/manual/en/mysqli.multi-query.php#115325
@Sean 最后一个分号不影响任何原因php.net/manual/en/mysqli.multi-query.php#113840

【解决方案2】：

如果您的数据库支持，我建议您单独运行查询并将它们包装到单个事务中。

$conn->begin_transaction();
$sql = "INSERT INTO db (name,picuploc,lname,pnumber,age,email,address,city,zipcode,ticketid,pickuptime,dropofftime,dropoffloc,vehicle,plateno,totalprice,date_registered) VALUES ('$first','$pickuploc','$lname','$pnumber','$age','$email','$address','$city','$zip','$ticket','$pickup','$dropoff','$dropoffloc','$car','$plate','$all', NOW());";
$conn->query($sql);

$sql = "UPDATE vehicles set quantity = quantity - $age WHERE vehicle = '$car' AND parent = '$ye';";
$conn->query($sql);

$sql = "UPDATE vehicles set status = '$un'  WHERE plateno = '$plate';";
$conn->query($sql);

$conn->commit();

我还建议您使用带参数的预处理语句，而不是将值直接包含在查询字符串中。

【讨论】：

【解决方案3】：

你可以使用 PHP mysqli_multi_query-function。

$sql = "INSERT INTO db (name,picuploc,lname,pnumber,age,email,address,city,zipcode,ticketid,pickuptime,dropofftime,dropoffloc,vehicle,plateno,totalprice,date_registered) VALUES ('$first','$pickuploc','$lname','$pnumber','$age','$email','$address','$city','$zip','$ticket','$pickup','$dropoff','$dropoffloc','$car','$plate','$all', NOW());";

$sql .= "UPDATE vehicles set quantity = quantity - $age WHERE vehicle = '$car' AND parent = '$ye' ;";

$sql .= "UPDATE vehicles set status = '$un'  WHERE plateno = '$plate' ;"; 

/* execute multi query */
if ($mysqli->multi_query($query)) {

}

【讨论】：