首页 \ 问答 \ Java：我们应该尽快退出try-with-resource块以释放资源吗？(Java: Should we exit from try-with-resource block ASAP to release the resource?)

Java：我们应该尽快退出try-with-resource块以释放资源吗？(Java: Should we exit from try-with-resource block ASAP to release the resource?)

 以下哪个代码段更好？ 在处理资源方面更好。  
try (Jedis jedis = jedisPool.getResource()) {
    String value = jedis.get("key");

    // Validation calls using `value` but not using `jedis`
    // Another DB call using `value` but not using `jedis`
}
 
 要么  
String value;
try (Jedis jedis = jedisPool.getResource()) {
    value = jedis.get("key");
}
// Validation calls using `value` but not using `jedis`
// Another DB call using `value` but not using `jedis`
 
 在第一个代码片段中，资源一直保持到其他不相关的操作完成，而在第二个代码片段中，它会在使用后立即释放？ 

Which of the below code snippet is better? Better in terms of handling resource. 
try (Jedis jedis = jedisPool.getResource()) {
    String value = jedis.get("key");

    // Validation calls using `value` but not using `jedis`
    // Another DB call using `value` but not using `jedis`
}
 
OR  
String value;
try (Jedis jedis = jedisPool.getResource()) {
    value = jedis.get("key");
}
// Validation calls using `value` but not using `jedis`
// Another DB call using `value` but not using `jedis`
 
In the first code snippet, the resource is held up until the other unrelated operations are completed whereas in the second it is being released as soon as it is used?

原文：https://stackoverflow.com/questions/51515492

更新时间：2024-03-19 14:03

最满意答案

 那应该实际上应该在循环内部，就像  
$args = array('post_type' => 'event') // setup my custom post type    
$todaysdate = "blah blah"; //setup for today's date

// the wp loop  
query_posts($args); 

if ( (have_posts()) : while (have_posts()) : the_post();

$eventdate = "blah blah"; // setup for the date of the event;

if($eventdate >= $todaysdate))

echo $event;

endif;

endwhile; endif;
 
 编辑：  
 Thanks, this works fine, however, I want to output a set number of events (5 in total) which I've defined in $args. So $args sets up 5 events, but the second IF then filters out old events so I end up with less than 5.  
 但这就是你在第一时间拥有的原因。 但是，如果您的意思是它应该显示在该日期之后的5个事件，则需要修改wp_query本身。 见这里的例子 

That if should actually be inside the loop, like 
$args = array('post_type' => 'event') // setup my custom post type    
$todaysdate = "blah blah"; //setup for today's date

// the wp loop  
query_posts($args); 

if ( (have_posts()) : while (have_posts()) : the_post();

$eventdate = "blah blah"; // setup for the date of the event;

if($eventdate >= $todaysdate))

echo $event;

endif;

endwhile; endif;
 
EDIT: 
Thanks, this works fine, however, I want to output a set number of events (5 in total) which I've defined in $args. So $args sets up 5 events, but the second IF then filters out old events so I end up with less than 5. 
But that's the very same reason you have that if in first place. However if you mean that it should show 5 events that are after that date then the wp_query itself needs to be modified. See Examples Here

Java：我们应该尽快退出try-with-resource块以释放资源吗？(Java: Should we exit from try-with-resource block ASAP to release the resource?)

最满意答案

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