无法在PHP中创建数据库

我开始创建我自己的接口来使用MySql，尽管我似乎无法使用底部的代码创建数据库。其他一切都可以正常工作，我可以回显$AcquinDatabase变量，以查看它是否存储了值。任何建议都很好

<?php
    session_start();

    //define connection
    $conn = new mysqli('localhost', 'over_watch','XXXXXXx','billing');

    //Variables
    $UserEmail = $_SESSION['email'];
    $MysqlUserDataBaseCreate  = $_POST['create_database'];

    //CheckIfUserExists
    $SeeIfUserExist = $conn->prepare("SELECT (email) FROM database_users WHERE email= ?;");
    $SeeIfUserExist->bind_param('s',$UserEmail);
    $SeeIfUserExist->execute();

     $SeeIfUserExist->bind_result($ObtainedEmail);
     $SeeIfUserExist->store_result();
     $SeeIfUserExist->fetch();
     $RowsReturnedFromPreparedStatment = $SeeIfUserExist->num_rows();


    if($RowsReturnedFromPreparedStatment < 1){
      $InsertIntoDatabase = $conn->prepare("INSERT INTO database_users(email,check_if_created) VALUES(?,?);");
      $InsertIntoDatabase->bind_param('ss',$UserEmail,$MysqlUserDataBaseCreate);
      $InsertIntoDatabase->execute();

      $SelectDatabaseToCreate = $conn->prepare(" SELECT (check_if_created) FROM database_users WHERE email = ?;");
      $SelectDatabaseToCreate->bind_param('s', $UserEmail);
      $SelectDatabaseToCreate->execute();

      $SelectDatabaseToCreate->bind_result($ObtainDatabase);
      $SelectDatabaseToCreate->fetch();
      $CreateDatabase = "CREATE DATABASE $ObtainDatabase ;";
      $conn->query($CreateDatabase);

    }else{
      echo 'user permitted to one database';
    }


    ?>

你能试试这个代码吗

有关此错误的详细信息可以在mysql文档中找到。阅读这些细节可以清楚地看出，在同一连接上执行另一条准备好的语句之前，需要完全获取一条准备好的语句执行的结果集

这是你能找到的文件

我是否缺少定义

$AcquinDatabase

的地方？我记得不久前看过这篇文章。那是怎么回事？另外，关于您的问题，请添加错误报告，这样您就可以知道您的代码出了什么问题。@smith我正在通过prepare语句（如果创建了，请检查），从数据库中选择它，然后使用bind_result（）和fetch（）获取值。请打印回显$ObtainDatabase时得到的输出。我们需要查看create table语句以确定其不起作用的原因。@SeanW333$ACCOUTAINDATABASE变量实际上是在代码顶部定义的$MysqlUserDataBaseCreate变量。在我使用了准备好的语句绑定结果函数后，我更改了变量名。是的，谢谢！！这个作品你介意和我分享你的见解吗？@jim。我已经给了一个链接，你可以参考更多信息

<?php
    session_start();

    //define connection
    $conn = new mysqli('localhost', 'over_watch','XXXXXXx','billing');

    //Variables
    $UserEmail = $_SESSION['email'];
    $MysqlUserDataBaseCreate  = $_POST['create_database'];

    //CheckIfUserExists
    $SeeIfUserExist = $conn->prepare("SELECT (email) FROM database_users WHERE email= ?;");
    $SeeIfUserExist->bind_param('s',$UserEmail);
    $SeeIfUserExist->execute();
    $SeeIfUserExist->store_result();

     $SeeIfUserExist->bind_result($ObtainedEmail);
     $SeeIfUserExist->store_result();
     $SeeIfUserExist->fetch();
     $RowsReturnedFromPreparedStatment = $SeeIfUserExist->num_rows();


    if($RowsReturnedFromPreparedStatment < 1){
      $InsertIntoDatabase = $conn->prepare("INSERT INTO database_users(email,check_if_created) VALUES(?,?);");
      $InsertIntoDatabase->bind_param('ss',$UserEmail,$MysqlUserDataBaseCreate);
      $InsertIntoDatabase->execute();
      $InsertIntoDatabase->store_result();

      $SelectDatabaseToCreate = $conn->prepare(" SELECT (check_if_created) FROM database_users WHERE email = ?;");
      $SelectDatabaseToCreate->bind_param('s', $UserEmail);
      $SelectDatabaseToCreate->execute();
      $SelectDatabaseToCreate->store_result();

      $SelectDatabaseToCreate->bind_result($ObtainDatabase);
      $SelectDatabaseToCreate->fetch();
      $CreateDatabase = "CREATE DATABASE $ObtainDatabase ;";
      $conn->query($CreateDatabase);

    }else{
      echo 'user permitted to one database';
    }


    ?>