entityMap|blocks|key|9m2lh|text|也许在where子句中使用case语句？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|rkut|+$query+=+"SELECT+u.*
+++++++++++FROM+users+u
+++++++++++WHERE+CASE+{$range}
+++++++++++++++++WHEN+'ALL'+then+TRUE
+++++++++++++++++ELSE+date_time+>+unix_timestamp(DATE_SUB(now()
++++++++++++++++++++++++++++++++++,+INTERVAL+1+{$range}))
+++++++++++++++++END";|code-block|syntax|javascript|f11cd^0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|I|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|J|9|@]|A|@]|B|$F|G]]|$2|H|4|-4|6|7|8|K|9|@]|A|@]|B|$]]]]

Perhaps use a case statement in your where clause?

<pre><code> $query = "SELECT u.*
 FROM users u
 WHERE CASE {$range}
 WHEN 'ALL' then TRUE
 ELSE date_time &gt; unix_timestamp(DATE_SUB(now()
 , INTERVAL 1 {$range}))
 END";
</code></pre>

entityMap|blocks|key|c9j58|text|switch+($_GET['range']){
++case+"week":
++$range+=+"WEEK";
+case+"month":
++$range+=+"MONTH";
+case+"year":
++$range+=+"YEAR";
+case+"ALL":
++$range+=+null;
}

$query+=+"SELECT+u.*
++++++FROM+users+u
++++++WHERE+1=1+";
if(!empty($range))+{
++$query+.=+"+AND+date_time+>+unix_timestamp(DATE_SUB(now(),+INTERVAL+1+$range))";
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|du9m9|有条件地添加datetime+where子句；WHERE+1=1将始终为真。因此，下一个条件的结果将影响最终结果|unstyled|offset|length|style|CODE|d61k5^0|0|N|9|0^^$0|$]|1|@$2|3|4|5|6|7|8|M|9|@]|A|@]|B|$C|D]]|$2|E|4|F|6|G|8|N|9|@$H|O|I|P|J|K]]|A|@]|B|$]]|$2|L|4|-4|6|G|8|Q|9|@]|A|@]|B|$]]]]

<pre><code>switch ($_GET['range']){
 case "week":
 $range = "WEEK";
 case "month":
 $range = "MONTH";
 case "year":
 $range = "YEAR";
 case "ALL":
 $range = null;
}

$query = "SELECT u.*
 FROM users u
 WHERE 1=1 ";
if(!empty($range)) {
 $query .= " AND date_time &gt; unix_timestamp(DATE_SUB(now(), INTERVAL 1 $range))";
}
</code></pre>

Add datetime where clause conditionally; <code>WHERE 1=1</code> will always be true. So the next condition's result will matter on the final result

entityMap|blocks|key|2u72o|text|我认为Adam的建议是这样的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|bap45|$where+=+'';

switch+($_GET['range'])+{

++++case+"week":
+++++++$where+=+"date_time+>+unix_timestamp(DATE_SUB(now(),+INTERVAL+1+WEEK))":
++++++++break;

++++case+"month":
+++++++$where+=+"date_time+>+unix_timestamp(DATE_SUB(now(),+INTERVAL+1+MONTH))":
++++++++break;

++++case+"year":
+++++++$where+=+"date_time+>+unix_timestamp(DATE_SUB(now(),+INTERVAL+1+YEAR))":
++++++++break;

++++default:
++++++++$where+=+'';
}

$query+=+"SELECT+u.*+FROM+users+u+WHERE+$where";|code-block|syntax|javascript|edjn7|假设使用其他标准进行报告？字符串连接变得杂乱无章。在部件之间添加'AND‘。完全取消WHERE关键字？其中表示SQL查询的OOP代码可能很有用。|5ps49^0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|K|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|L|9|@]|A|@]|B|$F|G]]|$2|H|4|I|6|7|8|M|9|@]|A|@]|B|$]]|$2|J|4|-4|6|7|8|N|9|@]|A|@]|B|$]]]]

I think what Adam was suggesting is something like this:

<pre><code>$where = '';

switch ($_GET['range']) {

 case "week":
 $where = "date_time &gt; unix_timestamp(DATE_SUB(now(), INTERVAL 1 WEEK))":
 break;

 case "month":
 $where = "date_time &gt; unix_timestamp(DATE_SUB(now(), INTERVAL 1 MONTH))":
 break;

 case "year":
 $where = "date_time &gt; unix_timestamp(DATE_SUB(now(), INTERVAL 1 YEAR))":
 break;

 default:
 $where = '';
}

$query = "SELECT u.* FROM users u WHERE $where";
</code></pre>

Assume reporting with other criteria? Where the string concatenation gets messy. Adding 'AND' between parts. Suppressing WHERE keyword entirely? Where OOP code to represent the SQL query can be useful.

entityMap|blocks|key|5ocej|text|让我们从以下事实开始:您的switch语句没有break语句，并且不会以您期望的方式工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|fka6b|以下是我的建议：|8rl68|$query+=+"SELECT+u.*
++++++++++FROM+users+u";

$range+=+false;

if+(isset($_GET['range']))+{++++
++++switch+($_GET['range']){
+++++++case+"week":
++++++++++$range+=+"WEEK";
++++++++++break;
+++++++case+"month":
++++++++++$range+=+"MONTH";
++++++++++break;
+++++++case+"year":
++++++++++$range+=+"YEAR";
++++++++++break;
+++++++default:
++++++++++$range+=+false;
++++}
}+


if+($range)+{
++$query+.=+"+WHERE+date_time+>+unix_timestamp(DATE_SUB(now(),+INTERVAL+1+$range))";
}|code-block|syntax|javascript|7qeir^0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|K|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|L|9|@]|A|@]|B|$]]|$2|E|4|F|6|G|8|M|9|@]|A|@]|B|$H|I]]|$2|J|4|-4|6|7|8|N|9|@]|A|@]|B|$]]]]

Let's start with the fact that your switch statement doesn't have break statements and isn't going to work the way you expect.

Here is what I'd suggest:

<pre><code>$query = "SELECT u.*
 FROM users u";

$range = false;

if (isset($_GET['range'])) { 
 switch ($_GET['range']){
 case "week":
 $range = "WEEK";
 break;
 case "month":
 $range = "MONTH";
 break;
 case "year":
 $range = "YEAR";
 break;
 default:
 $range = false;
 }
} 


if ($range) {
 $query .= " WHERE date_time &gt; unix_timestamp(DATE_SUB(now(), INTERVAL 1 $range))";
}
</code></pre>

entityMap|blocks|key|c5pa8|text|我将定义一个具有有效范围的数组，并首先验证用户输入。然后动态构建查询。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|eedqi|$validRanges+=+[
++++'year'++=>+'YEAR',
++++'month'+=>+'MONTH',
++++'week'++=>+'WEEK',
++++'ALL'+++=>+null
];

if+(isset($_GET['range'])+&&+!isset($validRanges[$_GET['range']]))+{
++++$range+=+$validRanges[$_GET['range']]);
}+else+{
++++//+it's+up+to+you,+what+to+do+in+this+case
++++throw+new+Exception('Range+is+not+valid+or+missing');
}

if+($range+===+null)+{
++++$rangeCondition+=+'1=1';
}+else+{
++++$rangeCondition+=+"date_time+>+unix_timestamp(NOW()+-+INTERVAL+1+$range)";
}

$query+=+"SELECT+u.*
++++++++++FROM+users+u
++++++++++WHERE+$rangeCondition";|code-block|syntax|javascript|dmepq^0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|I|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|J|9|@]|A|@]|B|$F|G]]|$2|H|4|-4|6|7|8|K|9|@]|A|@]|B|$]]]]

I would define an array with valid ranges and validate the user input first. Then build the query dynamicly.

<pre class="lang-php prettyprint-override"><code>$validRanges = [
 'year' =&gt; 'YEAR',
 'month' =&gt; 'MONTH',
 'week' =&gt; 'WEEK',
 'ALL' =&gt; null
];

if (isset($_GET['range']) &amp;&amp; !isset($validRanges[$_GET['range']])) {
 $range = $validRanges[$_GET['range']]);
} else {
 // it's up to you, what to do in this case
 throw new Exception('Range is not valid or missing');
}

if ($range === null) {
 $rangeCondition = '1=1';
} else {
 $rangeCondition = "date_time &gt; unix_timestamp(NOW() - INTERVAL 1 $range)";
}

$query = "SELECT u.*
 FROM users u
 WHERE $rangeCondition";
</code></pre>

I'm making a query dynamically like this:

<pre><code>$query = "SELECT u.*
 FROM users u
 WHERE date_time &gt; unix_timestamp(DATE_SUB(now(), INTERVAL 1 $range))";
</code></pre>

Also <code>$range</code> contains a word like this:

<pre><code>switch ($_GET['range']){
 case "week":
 $range = "WEEK";
 case "month":
 $range = "MONTH";
 case "year":
 $range = "YEAR";
 case "ALL":
 $range = &lt;I don't know what should I put here to get the expected result&gt;;
}
</code></pre>

As I've said above, I want to set something as <code>$range</code> value to make the <code>WHERE</code> clause something like <code>WHERE 1</code>. How can I do that?

How can I emulate WHERE 1 in a dynamic query?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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 我像这样动态地进行查询： $query = "SELECT u.*          FROM users u          WHERE date_time > unix_timestamp(DATE_SUB(now(), INTERVAL 1 $range))"; 此外，$range还包含一个类似于以下内容的单...

问如何在动态查询中模拟WHERE 1？
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问如何在动态查询中模拟WHERE 1？EN