Question

你能告诉我为什么我的代码不起作用吗？在我的用户名表中，我有两列，username和<?php require('dbConnect.php'); $Number = $_POST['phonenumber']; // The ? below are parameter markers used for variable binding // auto increment does not need prepared statements $query = "INSERT INTO user (username) VALUES (?)"; $stmt = mysqli_prepare($con,$query) or die(mysqli_error($con)); //bind variables mysqli_stmt_bind_param($stmt,"s",$u); //$stmt->bind_param("s",$u); mysqli_stmt_execute($stmt); if(mysqli_query($con,$query)) { echo 'Inserted correctly'; } else { echo 'Error'; echo var_dump($stmt); } mysqli_stmt_close($stmt); mysqli_close($con); ?>。 user_id是自动增量所以我在我的Sql语句中没有这个，我认为这是正确的做法。

C:\wamp64\www\phpproject\php-project\insert.php:28:
object(mysqli_stmt)[2]
  public 'affected_rows' => int -1
  public 'insert_id' => int 0
  public 'num_rows' => int 0
  public 'param_count' => int 1
  public 'field_count' => int 0
  public 'errno' => int 1048
  public 'error' => string 'Column 'username' cannot be null' (length=32)
  public 'error_list' => 
    array (size=1)
      0 => 
        array (size=3)
          'errno' => int 1048
          'sqlstate' => string '23000' (length=5)
          'error' => string 'Column 'username' cannot be null' (length=32)
  public 'sqlstate' => string '23000' (length=5)
  public 'id' => int 1

我一直在＆＃39;错误＆＃39;，在我的var_dump中得到：

pip3

Answer 1

像这样使用null进行自动增量

$query = "INSERT INTO user (user_id,username) VALUES (null,$username)";

errno 1048，＆＃39;列＆＃39;用户名＆＃39;不能为空＆＃39;

1 个答案: