CodeIgniter插入两次相同的条目。在某些情况下

Question

我想弄清楚为什么Codeigniter在我的数据库中插入2次相同的行。我使用PDO作为mySQL的接口。我正在调试它，并且我确定下面的函数没有被执行两次。它发生在特定情况下，如果两个foreache因为数组为空而不运行，但是如果其中一个运行错误不会发生。

`

public function save_all() //save all information with the launched flag FALSE 
{ 
    include(database_vars_url()); 
    try 
    { 
     $this->add_new_skills(); 

     if(!isset($_SESSION)) 
     { 
      session_start(); 
     } 
     $email = $_SESSION["email"]; 
     $sql = "INSERT INTO $tbl_name_contest (user_id, contest_title, contest_overview, contest_description, 
       contest_category, contest_holder, contest_prize, contest_stage, contest_duration, contest_proj_duration, 
       contest_level, contest_finalist, contest_winner, contest_create, contest_launched, contest_edit, 
       contest_edit_id, contest_status, contest_delete) 
       VALUES (0, '$this->title', '$this->overview', '$this->description', '$this->category', 
       (SELECT customer_id FROM $tbl_name_customer WHERE user_id = 
       (SELECT user_id FROM $tbl_name_user WHERE user_email='$email')), '$this->prize', 0, '$this->contest_period', 
       '$this->project_period', -1, -1, -1, NULL, DEFAULT, NULL, -1, -1, DEFAULT); "; 

     foreach ($this->addon as $value) 
     { 
      $sql = $sql . "INSERT INTO $tbl_rel_contest_addon (add_contest_id, add_addon_id) 
          VALUES ((SELECT contest_id FROM $tbl_name_contest WHERE contest_title = '$this->title' 
          AND contest_overview = '$this->overview' AND contest_prize = '$this->prize'), 
          (SELECT addon_id FROM $tbl_name_addon WHERE addon_name = '$value')); "; 
     } 

     foreach ($this->skills as $value) 
     { 
      $sql = $sql . "INSERT INTO $tbl_rel_contest_skill (required_contest_id, required_skill_id) 
          VALUES ((SELECT contest_id FROM $tbl_name_contest WHERE contest_title = '$this->title' 
          AND contest_overview = '$this->overview' AND contest_prize = '$this->prize'), 
          (SELECT skill_id FROM $tbl_name_skill WHERE skill_name = '$value')); "; 
     } 
     echo $sql; 
     return $this->db->query($sql); 
    } 
    catch(Exception $e) 
    { 
     echo $e->getMessage(); 
    } 
    return 0; 
} 

在这里，我有一个日志的MySQL，前两个选择所用所谓的 “$这个 - > add_new_skills（）;”在函数save_all（）的开头。这些SELECT应该也只是一个。这个顺序SELECT SELECT，INSERT INSERT，证明函数save_all（）没有被调用两次，如果它被调用两次，那么顺序将是SELECT INSERT SELECT INSERT。

138 Connect root@localhost on repsero 
138 Query SELECT skill_name FROM skill WHERE skill_status=2 
138 Query SELECT skill_name FROM skill WHERE skill_status=2 
138 Quit 
139 Connect root@localhost on repsero 
139 Quit 
140 Connect root@localhost on repsero 
140 Query INSERT INTO contest (user_id, contest_title, contest_overview, contest_description, contest_category, contest_holder, contest_prize, contest_stage, contest_duration, contest_proj_duration, contest_level, contest_finalist, contest_winner, contest_create, contest_launched, contest_edit, contest_edit_id, contest_status, contest_delete) VALUES (0, 'Contest Name', 'Overview of the contest Overview of the contest Overview of the contest Overview of the contest Overview of the contest Overview of the contest ', 'Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description ', 'SEO', (SELECT customer_id FROM customer WHERE user_id = (SELECT user_id FROM user WHERE user_email='customer@repsero.com')), '300', 0, '5','1', -1, -1, -1, NULL, DEFAULT, NULL, -1, -1, DEFAULT) 
140 Query INSERT INTO contest (user_id, contest_title, contest_overview, contest_description, contest_category, contest_holder, contest_prize, contest_stage, contest_duration, contest_proj_duration, contest_level, contest_finalist, contest_winner, contest_create, contest_launched, contest_edit, contest_edit_id, contest_status, contest_delete) VALUES (0, 'Contest Name', 'Overview of the contest Overview of the contest Overview of the contest Overview of the contest Overview of the contest Overview of the contest ', 'Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description Description ', 'SEO',(SELECT customer_id FROM customer WHERE user_id = (SELECT user_id FROM user WHERE user_email='customer@repsero.com')), '300', 0, '5', '1', -1, -1, -1, NULL, DEFAULT, NULL, -1, -1, DEFAULT) 
140 Quit 

Answer 1

嗯，我发现，在CI_DB_pdo_driver的_execute（）函数的笨体系内不能正常工作，也许这是因为PHP版本。

function _execute($sql) 
{ 
    $sql = $this->_prep_query($sql); 
    $result_id = $this->conn_id->prepare($sql); 
    $result_id->execute(); 

    if (is_object($result_id)) 
    { 
     if (is_numeric(stripos($sql, 'SELECT'))) 
     { 
      $this->affect_rows = count($result_id->fetchAll()); 
      $result_id->execute(); 
     } 
     else 
     { 
      $this->affect_rows = $result_id->rowCount(); 
     } 
    } 
    else 
    { 
     $this->affect_rows = 0; 
    } 

    return $result_id; 
} 

TO：反正我从改变笨的代码

function _execute($sql) 
{ 
    $sql = $this->_prep_query($sql); 
    $result_id = $this->conn_id->prepare($sql); 
    $result_id->execute(); 

    if (is_object($result_id)) 
    { 
     if (preg_match('/^\s*"?(SELECT)\s+/i', $sql)) 
     { 
      $this->affect_rows = count($result_id->fetchAll()); 
      $result_id->execute(); 
     } 
     else 
     { 
      $this->affect_rows = $result_id->rowCount(); 
     } 
    } 
    else 
    { 
     $this->affect_rows = 0; 
    } 

    return $result_id; 
} 

，测试如果$ sql中包含“SELECT”里面没有工作的一部分，所以当我试图插入“$ result_id-> execute（）”被调用两次。