運行查詢在嵌套循環

Question

之前解釋的代碼，我來解釋數據

所以我在此格式有數據的結構

=>Department 
==>Category 
===>Sub-Category 

存在具有多個類別的多個部門，這些類別有子類別。

有可能是具有相同名稱但不同的部門和子類別和類別相同的一個多類。

有表包含所有的數據和產品。我有一個適當的提取數據，並把在

Departments 
Categories => fk is Departments id 
Subcategories => fk is Categories id 

一表我正在插入的部門

然後在大類首先我必須得到主管部門的ID，然後在插入類表中的數據：

public function insertDataInCategory($data) 
{ 
    if(!empty($data)){ 
     //pass data from hierarchy 
     foreach ($data as $dkey => $drow) { 
      //get id 
      $this->db->select('id'); 
      $this->db->from('departments'); 
      $this->db->WHERE('name',$dkey); 
      $query = $this->db->get(); 
      //getting department it to identify category 
      $did = $query->result_array(); 

      //adding category from department 
      foreach ($drow as $ckey => $crow) { 
       $cat_content = array(
        'department_id' => $did[0]['id'] , 
        'name' => $ckey , 
        'description' => '' 
       ); 
       $this->db->insert('categories', $cat_content); 
      } 
     } 
    } 
} 

在子類第一，我必須得到主管部門的ID爲類別之後，我確定這個子類都屬於這一類。 因此，在這裏運行的3個查詢正在增加執行時間。

public function insertDataInSubcategory($data) 
{ 
    //pass data from hierarchy 
    if(!empty($data)){ 
     //department foreach 
     foreach ($data as $dkey => $drow) { 
      //category each 
      $this->db->select('id'); 
      $this->db->from('departments'); 
      $this->db->WHERE('name',$dkey); 
      $query = $this->db->get(); 
      //getting department it to identify category 
      $did = $query->result(); 
      foreach ($drow as $ckey => $crow) { 
       //get id 
       $this->db->select('id'); 
       $this->db->from('categories'); 
       $this->db->WHERE('name',$ckey); 
       $this->db->WHERE('department_id',$did[0]->id); 
       $query = $this->db->get(); 
       //getting id of category of sub-category 
       $cid = $query->result_array(); 
       //sub-category foreach 
       foreach ($crow as $skey => $srow) { 
        $scat_content = array(
         'category_id' => $cid[0]['id'] , 
         'name' => $skey , 
         'description' => '' 
        ); 
        $this->db->insert('sub_categories', $scat_content); 
       }  
      } 
     } 
    } 
} 

insertDataInCategory和insertDataInSubcategory時間的功能急劇增加。請告訴我如何減少它的時間。和適當的方法插入到表

Answer 1

請修改功能我下面提到。它將解決你的嵌套循環問題。這裏我假設$ this-> db-> insert返回插入的行ID。如果它沒有返回id，那麼你需要使用select查詢來獲取它並將它存儲在提到的變量中。

public function insertDataInDepartment($data) 
{ 
    if(!empty($data)){ 
     //pass data from hierarchy 
     foreach ($data as $dkey => $drow) { 
       $dept_content = array(
       'name' => $dkey , 
       'description' => '' , 
       'is_active' => 'y' 
      ); 
       $intInsertId = $this->db->insert('departments', $dept_content); 
      insertDataInCategory($drow , $intInsertId); 
     } 
    } 
} 

public function insertDataInCategory($drow, $deptId) 
{ 
     foreach ($drow as $ckey => $crow) { 
      $cat_content = array(
       'department_id' => $did[0]['id'] , 
       'name' => $ckey , 
       'description' => '' 
     ); 
      $intCatId = $this->db->insert('categories', $cat_content); 
      insertDataInSubcategory($crow, $intCatId); 
    } 
} 

public function insertDataInSubcategory($data) 
{ 
     foreach ($crow as $skey => $srow) { 
      $scat_content = array(
       'category_id' => $cid[0]['id'] , 
       'name' => $skey , 
       'description' => '' 
      ); 
      $this->db->insert('sub_categories', $scat_content); 
    } 
} 

Answer 2

問題是您正在多次運行查詢，這會增加執行時間。運行單個查詢將減少您的時間。

試試這個代碼：

public function insertDataInCategory($data) 
{ 
    if(!empty($data)){ 
     //pass data from hierarchy 
     foreach ($data as $dkey => $drow) { 
      //get id 
      //adding category from department 
      foreach ($drow as $ckey => $crow) { 
        $query = "INSERT INTO categories "; 
        $query.= "(department_id, name , description)"; 
        $query.= "VALUES ((SELECT id FROM departments WHERE name = '$dkey') , '$ckey' , '')"; 
        $this->db->query($query); 
      } 
     } 
    } 
} 

public function insertDataInSubcategory($data) 
{ 
    //pass data from hierarchy 
    if(!empty($data)){ 
     //department foreach 
     foreach ($data as $dkey => $drow) { 
      foreach ($drow as $ckey => $crow) { 
       //sub-category foreach 
       foreach ($crow as $skey => $srow) { 
        $query = "INSERT INTO sub_categories "; 
        $query.= "(category_id , name , description)"; 
        $query.= "VALUES ((SELECT id FROM categories WHERE name = '$ckey' && department_id = (SELECT id FROM departments WHERE name = '$dkey')) , '$skey' , '')"; 
        $this->db->query($query); 
       }  
      } 
     } 
    } 
} 

現在只有一個連接設置，它會更快插入記錄。