如何在PHP中执行2个或更多SQL查询而不连接表 [英] How to execute 2 or more SQL queries in PHP without joining tables
问题描述
要从1个表中选择数据,我正在使用以下代码:
To select data from 1 table I'm using following code:
if(isset($UserID)) {
$users = $con->prepare("
SELECT DISTINCT
d.FirstName
,d.LastName
,d.Picture
FROM Details d
WHERE d.UserId = ?
");
$users->bind_param('i', $GetUserId);
$users->execute();
$users->bind_result(
$FirstName,
$LastName,
$Picture
);
} else {
echo "There is no User ID detected, try to refresh browser.";
}
while ($users->fetch()) { ?>
<div class="grid-group">
<span>Personal Details</span>
<div class="grid-column">
<div class="grid-item header">First Name </div>
<div class="grid-item header">Last Name </div>
<div class="grid-item header">Picture </div>
</div>
<div class="grid-column">
<div class="grid-item"><?php echo $FirstName; ?></div>
<div class="grid-item"><?php echo $LastName; ?></div>
<div class="grid-item"><?php echo $Picture; ?></div>
</div>
</div>
<?php } ?>
如何再添加1个查询以从另一个表中选择一些数据?像这样:
How can I add 1 more query to select some data from another table? Something like:
SELECT Foo, Bar, FooBar
FROM Bizz
WHERE UserId = ?
我应该使用mysqli_multi_query
吗?但是,如何使用它以及在它之后使用bind_result
呢?我无法实现正确的语法.还是有其他方法?
Should I use mysqli_multi_query
? But how can I use It and bind_result
after It? I can't achieve correct syntax. Or there is any other way?
我将需要从2个表中打印数据,如下所示:
I will need to print data from 2 tables like this:
while ($users->fetch()) { ?>
<div class="grid-group">
<span>Personal Details</span>
<div class="grid-column">
<div class="grid-item header">First Name </div>
<div class="grid-item header">Last Name </div>
<div class="grid-item header">Picture </div>
</div>
<div class="grid-column">
<div class="grid-item"><?php echo $FirstName; ?></div>
<div class="grid-item"><?php echo $LastName; ?></div>
<div class="grid-item"><?php echo $Picture; ?></div>
</div>
</div>
<div class="grid-group">
<span>Foo Bar</span>
<div class="grid-column">
<div class="grid-item header">Foo </div>
<div class="grid-item header">Bar </div>
<div class="grid-item header">FooBar </div>
</div>
<div class="grid-column">
<div class="grid-item"><?php echo $Foo; ?></div>
<div class="grid-item"><?php echo $Bar; ?></div>
<div class="grid-item"><?php echo $FooBar; ?></div>
</div>
</div>
<?php } ?>
由于某些原因,我不能使用JOINS
.你有什么想法吗?
For some reasons I can't use JOINS
. Have you any ideas?
更新
如果我在下面准备2个查询,则会出现空白屏幕:
If I prepare 2 queries in following, I got blank screen:
if(isset($UserID)) {
$users = $con->prepare("
SELECT DISTINCT
d.FirstName
,d.LastName
,d.Picture
FROM Details
WHERE d.UserId = ?
");
$users->bind_param('i', $GetUserId);
$users->execute();
$users->bind_result(
$FirstName,
$LastName,
$Picture
);
$users2 = $con->prepare("
SELECT DISTINCT
Foo
, Bar
, FooBar
FROM Bizz
WHERE UserId = ?
");
$users2->bind_param('i', $GetUserId);
$users2->execute();
$users2->bind_result(
$Foo,
$Bar,
$FooBar
);
} else {
echo "There is no User ID detected, try to refresh browser.";
}
while ($users->fetch()) { ?>
...
您有什么想法吗?
推荐答案
要知道为什么会出现空白屏幕,您必须打开error_reporting,请在php代码开头添加以下内容:
to know why you get a blank screen you have to turn on error_reporting, add the following at the start of your php code before anything else:
error_reporting(-1);
还添加一些代码来显示MySQL中可能发生的错误:
Also add some code to show errors that might happen in MySQL:
if(isset($UserID)) {
$users = $con->prepare("
SELECT DISTINCT
d.FirstName
,d.LastName
,d.Picture
FROM Details
WHERE d.UserId = ?
");
if (!$users) {
echo 'MySQL Connect Error in Query: (' . $mysqli->errno . ') ';
}
$binding = $users->bind_param('i', $GetUserId);
if (!$binding) {
echo 'MySQL Connect Error in Query: (' . $mysqli->errno . ') ';
}
if($users->execute() == false) {
echo 'Error: ' . $con->error;
}
$binding_results = $users->bind_result(
$FirstName,
$LastName,
$Picture
);
if (!$binding_results) {
echo 'MySQL Connect Error in Query: (' . $mysqli->errno . ') ';
}
$users2 = $con->prepare("
SELECT DISTINCT
Foo
, Bar
, FooBar
FROM Bizz
WHERE UserId = ?
");
if (!$users2) {
echo 'MySQL Connect Error in Query: (' . $mysqli->errno . ') ';
}
$binding2 = $users2->bind_param('i', $GetUserId);
if (!$binding2) {
echo 'MySQL Connect Error in Query: (' . $mysqli->errno . ') ';
}
if($users2->execute() == false) {
echo 'Error: ' . $con->error;
}
$binding_results2 = $users2->bind_result(
$Foo,
$Bar,
$FooBar
);
if (!$binding_results2) {
echo 'MySQL Connect Error in Query: (' . $mysqli->errno . ') ';
}
我可以在您的第一个查询中看到一个错误.您正在使用d.FirstName,其中表名是Details
I can see one mistake in your first query. you are using d.FirstName where as the table name is Details
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