我在mysql pdo上遇到了一个奇怪的错误我该如何解决？

问题描述

我想在个人资料表中插入一些数据，我的个人资料表结构看起来像

  CREATE TABLE Profile (
  profile_id INTEGER NOT NULL AUTO_INCREMENT,user_id INTEGER NOT NULL,first_name TEXT,last_name TEXT,email TEXT,headline TEXT,summary TEXT,PRIMARY KEY(profile_id),CONSTRAINT profile_ibfk_2
    FOREIGN KEY (user_id)
    REFERENCES users (user_id)
    ON DELETE CASCADE ON UPDATE CASCADE
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;

这是位置表的样子

  CREATE TABLE Position (
  position_id INTEGER NOT NULL AUTO_INCREMENT,profile_id INTEGER,rank INTEGER,year INTEGER,description TEXT,PRIMARY KEY(position_id),CONSTRAINT position_ibfk_1
    FOREIGN KEY (profile_id)
    REFERENCES Profile (profile_id)
    ON DELETE CASCADE ON UPDATE CASCADE
   ) ENGINE=InnoDB DEFAULT CHARSET=utf8;    

这是我的插入查询：

           $insert = $con->prepare("insert into 
            profile(user_id,first_name,last_name,email,headline,summary)
                
         
        values(:user_id,:firstName,:lastName,:email,:headline,:summary)");
                
                $insert->bindParam(':user_id',$user_id);
                $insert->bindParam(':firstName',$firstName);
                $insert->bindParam(':lastName',$lastName);
                $insert->bindParam(':email',$email);
                $insert->bindParam(':headline',$headline);
                $insert->bindParam(':summary',$summary);
                //Now need to execute the operation
               // $insert->execute();
                $profile_id=$con->lastInsertId();

                //insert to position
                $rank=1;
                for($i=1; $i<=9; $i++){
                    if(! isset($_POST['year'.$i])) continue;
                    if(! isset($_POST['desc'.$i])) continue;
                    $insert = $con->prepare("insert into position 
                    (profile_id,rank,year,description)
                     values(:profile_id,:rank,:year,:desc)");
                    //Here we need to bind those variable for storing 
                    value into the database
                    $insert->bindParam(':profile_id',$profile_id);
                    $insert->bindParam(':rank',$rank);
                    $insert->bindParam(':year',$_POST['year'.$i]);
                    $insert->bindParam(':desc',$_POST['desc'.$i]);

                    //Now need to execute the operation
                    $rank++;
                 //   $insert->execute();

                }
                if($insert->execute()){
                    $_SESSION['profile_addition'] = 'Profile added';
                    header("location:index.php");
                }
                else{
                    print_r($insert->errorInfo());
                }

在这些插入查询中，我想尝试在用户单击添加按钮时同时插入两个表中。 现在我的问题是：当我想将数据插入轮廓和位置表中时。它给出了一个错误。这是错误

    Array ( [0] => 23000 [1] => 1452 [2] => Cannot add or update a child 
    row: a foreign key constraint fails (`courseraassignment`.`position`,CONSTRAINT `position_ibfk_1` FOREIGN KEY (`profile_id`) REFERENCES `profile` (`profile_id`) ON DELETE CASCADE ON UPDATE CASCADE) )

所以，现在我的问题是：我的代码有什么问题？如果可以的话，请协助我获得解决方案。预先谢谢你。

解决方法

尝试此代码，您应该在获取最后一个insertid之前执行查询，并且还应该在循环内而不是外部执行查询

$insert = $con->prepare("insert into 
profile(user_id,first_name,last_name,email,headline,summary)


values(:user_id,:firstName,:lastName,:email,:headline,:summary)");

$insert->bindParam(':user_id',$user_id);
$insert->bindParam(':firstName',$firstName);
$insert->bindParam(':lastName',$lastName);
$insert->bindParam(':email',$email);
$insert->bindParam(':headline',$headline);
$insert->bindParam(':summary',$summary);
//Now need to execute the operation
$insert->execute(); // uncomment this execute
$profile_id=$con->lastInsertId();

//insert to position
$rank=1;
$checker = false ;
for($i=1; $i<=9; $i++){
    if(! isset($_POST['year'.$i])) continue;
    if(! isset($_POST['desc'.$i])) continue;
    $insert = $con->prepare("insert into position 
    (profile_id,rank,year,description)
     values(:profile_id,:rank,:year,:desc)");
    //Here we need to bind those variable for storing 
    value into the database
    $insert->bindParam(':profile_id',$profile_id);
    $insert->bindParam(':rank',$rank);
    $insert->bindParam(':year',$lastName);
    $insert->bindParam(':desc',$email);

    //Now need to execute the operation inside loop 
    $rank++;
    if($insert->execute()){
        $checker = true ;
    }

}
// here you can't check execute 
if( $checker){
    $_SESSION['profile_addition'] = 'Profile added';
    header("location:index.php");
}
else{
    print_r($insert->errorInfo());
}