以有效方式生成動態SQL過濾器腳本

我正在編寫下面列出的代碼，根據各種值動態生成查詢過濾器腳本。在某些情況下，這些值很少，但在某些情況下，它超出了極限，這看起來我的代碼結構非常令人費解。以有效方式生成動態SQL過濾器腳本

以下是樣本過濾器查詢生成代碼。

if ($entity->iscomments != 2) 
    { 
     $script .= " v.iscomments=:iscomments"; 
     if ($entity->term != "" || $entity->categoryid != 0 || $entity->isfeatured != 3 || $entity->type != 2 || $entity->username != "" || $entity->month > 0 || $entity->isenabled != 2 || $entity->isapproved != 2 || $entity->isadult != 2 || $entity->isprivate != 3 || $entity->isexternal != 3 || $entity->datefilter > 0 || $entity->filter > 0 || $entity->mode > 0 || $entity->galleryid > 0) 
      $script .= " AND"; 
    } 
    if ($entity->galleryid > 0) 
    { 
     $script .= " v.galleryid=:galleryid"; 
     if ($entity->term != "" || $entity->categoryid != 0 || $entity->isfeatured != 3 || $entity->type != 2 || $entity->username != "" || $entity->month > 0 || $entity->isenabled != 2 || $entity->isapproved != 2 || $entity->isadult != 2 || $entity->isprivate != 3 || $entity->isexternal != 3 || $entity->datefilter > 0 || $entity->mode > 0) 
      $script .= " AND"; 
    } 

    if ($entity->isprivate != 3) 
    { 
     $script .= " v.isprivate=:isprivate"; 
     if ($entity->term != "" || $entity->categoryid != 0 || $entity->isfeatured != 3 || $entity->type != 2 || $entity->username != "" || $entity->month > 0 || $entity->isenabled != 2 || $entity->isapproved != 2 || $entity->isadult != 2 || $entity->isexternal != 3 || $entity->datefilter > 0 || $entity->mode > 0) 
      $script .= " AND"; 
    } 

    if ($entity->mode > 0) 
    { 
     $script .= " v.mode=:mode"; 
     if ($entity->term != "" || $entity->categoryid != 0 || $entity->isfeatured != 3 || $entity->type != 2 || $entity->username != "" || $entity->month > 0 || $entity->isenabled != 2 || $entity->isapproved != 2 || $entity->isadult != 2 || $entity->isexternal != 3 || $entity->datefilter > 0) 
      $script .= " AND"; 
    } 
    if ($entity->categoryid != 0) 
    { 
     $script .= " v.categoryid=:categoryid"; 
     if ($entity->term != "" || $entity->isfeatured != 3 || $entity->type != 2 || $entity->username != "" || $entity->month > 0 || $entity->isenabled != 2 || $entity->isapproved != 2 || $entity->isadult != 2 || $entity->isexternal != 3 || $entity->datefilter > 0) 
      $script .= " AND"; 
    }

在代碼它看起來像如果沒有巨大的條件，這使得代碼conjested，而不是很好看，但它完美。

有沒有更好的方法來處理這種情況，以便生成複雜的過濾器查詢，但使用更少的代碼量和更好的方法。

來源

2013-08-04 irfanmcsd

我不明白內大if語句。不應該總是有'AND'，但不是在查詢結束時？ – bitWorking

如果條件檢查內部是否存在其他過濾器活動，如果是，那麼它附加AND之前。 – irfanmcsd

另一種方法http://stackoverflow.com/questions/14351617/build-dynamic-sql-with-and-expressions-without-confusing-nested-conditionals/14351748#14351748 – goat

這應該工作：

$filters = array(); 

if ($entity->iscomments != 2) { 
    $filters[] = "v.iscomments=:iscomments"; 
} 

if ($entity->galleryid > 0) { 
    $filters[] = "v.galleryid=:galleryid"; 
} 

... 

$script .= ' '.implode(' AND ', $filters);

來源

2013-08-04 18:00:16 bitWorking

謝謝，它看起來工作。我正在執行並讓你更新。 – irfanmcsd

是的..聽說... – bitWorking

謝謝，它工作完美，使代碼更清潔和更好 – irfanmcsd

以有效方式生成動態SQL過濾器腳本

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