解决提取对象的未捕获错误 [英] Solve uncaught error of fetch object
问题描述
control.php
control.php
<?php
include("model.php");
$model = new Model;
if(isset($_POST[''register''])) {
$fname = $_POST[''fname''];
$lname = $_POST[''lname''];
$uname = $_POST[''uname''];
$pass = $_POST[''pass''];
$mail = $_POST[''mail''];
$add = $_POST[''add''];
$f = "upload/";
$f = $f.$_FILES[''file''][''name''];
move_uploaded_file($_FILES[''file''][''tmp_name''], $f);
$data = array("firstname"=>$fname, "lastname"=>$lname, "username"=>$uname, "password"=>$pass, "email"=>$mail, "address"=>$add, "file"=>$f);
$model->insertall($conn, "user", $data);
echo "inserted";
header("Location:view_user.php");
}
$select = $model->selectall($conn, "user");
if(isset($_GET[''del''])) {
$id = $_GET[''del''];
$result = $model->deleteall($conn, "user", $id);
if($result == false) {
echo "Error: cannot delete user";
return false;
} else {
return true;
}
}
if(isset($_GET[''edit''])) {
$eid = $_GET[''edit''];
$where = array("id"=>$eid);
$fetch = $model->select_where($conn, "user", $where);
$edit = $fetch->fetch_object();
if(isset($_POST[''update''])) {
$fname = $_POST[''fname''];
$lname = $_POST[''lname''];
$uname = $_POST[''uname''];
$mail = $_POST[''mail''];
$add = $_POST[''add''];
$f = "upload/";
$f = $f.$_FILES[''file''][''name''];
move_uploaded_file($_FILES[''file''][''tmp_name''], $f);
$data = array("firstname"=>$fname, "lastname"=>$lname, "username"=>$uname, "email"=>$mail, "address"=>$add, "file"=>$f);
$model->updateall($conn, "user", $data,$where);
echo "updated";
header("Location:view_user.php");
}
}
?>
model.php
model.php
<?php
include("conn.php");
$obj = new Connection;
$conn = $obj->connect();
class Model {
function insertall($conn, $table, $data) {
$keys = array_keys($data);
$key = implode(",", $keys);
$vals = array_values($data);
$val = implode("'',''", $data);
$ins = "INSERT INTO $table($key) VALUES(''$val'')";
$conn->query($ins);
}
function selectall($conn, $table) {
$sel = "SELECT * FROM $table";
$res = $conn->query($sel);
while ($row = $res->fetch_object()) {
$r[] = $row;
}
return $r;
}
function deleteall($conn, $table, $id) {
$del = "DELETE FROM $table WHERE id=''$id'' ";
$result = $conn->query($del);
if($result) {
header("Location: view_user.php");
}
}
function select_where($conn, $table, $where) {
$wkey = array_keys($where);
$wval = array_values($where);
$sel = "SELECT * FROM $table WHERE";
$i = 0;
foreach($where as $w) {
$sel.= "$wkey[$i] = ''$wval[$i]''";
$i++;
}
return $conn->query($sel);
}
function updateall($conn, $table, $data, $where) {
$wkey = array_keys($where);
$wval = array_values($where);
$dkey = array_keys($data);
$dval = array_values($data);
$up = "UPDATE $table SET";
$count = count($data);
$i = 0;
foreach ($data as $d) {
if ($count == $i + 1) {
$up.= "$dkey[$i] = ''$dval[$i]''";
} else {
$up.= "$dkey[$i] = ''$dval[$i]'',";
}
$i++;
}
$up.= "WHERE 1 = 1";
$j = 0;
foreach($where as $w) {
$up.= "AND $wkey[$j] = ''$wval[$j]''";
$j++;
}
return $conn->query($up);
}
}
?>
edit.php
edit.php
<?php
include("control.php");
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>registration</title>
</head>
<body>
<h1><center>Registration</center></h1><hr/>
<form method="post" enctype="multipart/form-data">
<table border="1" align="center">
<tr>
<td>First Name:</td>
<td><input type="text" name="fname" required="" value="<?php echo $edit->firstname; ?>"></td>
</tr>
<tr>
<td>last Name:</td>
<td><input type="text" name="lname" required="" value="<?php echo $edit->lastname; ?>"></td>
</tr>
<tr>
<td>User Name:</td>
<td><input type="text" name="uname" required="" value="<?php echo $edit->username; ?>"></td>
</tr>
<tr>
<td>Email ID:</td>
<td><input type="email" name="mail" required="" value="<?php echo $edit->email; ?>"></td>
</tr>
<tr>
<td>Address:</td>
<td><textarea name="add" required="" rows="3" cols="21"><?php echo $edit->address; ?></textarea></td>
</tr>
<tr>
<td>File:</td>
<td><input type="file" name="file" required="" value="<?php echo $edit->file; ?>"></td>
</tr>
<tr>
<td colspan="2"><center><input type="submit" name="update" value="Update"></center></td>
</tr>
</table>
</form>
</body>
</html>
view_user.php
view_user.php
<?php
include("control.php");
?>
<!DOCTYPE html>
<html>
<head>
<title>View User Details</title>
</head>
<body>
<form method="post">
<table border="1">
<tr>
<th>id</th>
<th>First Name</th>
<th>Last Name</th>
<th>User Name</th>
<th>Email Id</th>
<th>Address</th>
<th>File</th>
<th>Delete</th>
<th>Edit</th>
</tr>
<?php
foreach($select as $s)
{
?>
<tr>
<td><?php echo $s->id; ?></td>
<td><?php echo $s->firstname; ?></td>
<td><?php echo $s->lastname; ?></td>
<td><?php echo $s->username; ?></td>
<td><?php echo $s->email; ?></td>
<td><?php echo $s->address; ?></td>
<td><img src="<?php echo $s->file; ?>" height="100px" width="100px"></td>
<td><a href="view_user.php?del=<?php echo $s->id; ?>">Delete </a></td>
<td><a href="edit.php?edit=<?php echo $s->id; ?>">Edit </a></td>
</tr>
<?php
}
?>
</table>
</form>
</body>
</html>
执行编辑时发生此错误:
致命错误:未捕获错误:在C:\ xampp \ htdocs \ crud_php \ crud \ control.php:40中的布尔值上调用成员函数fetch_object():40堆栈跟踪:#0 C:\ xampp \ htdocs \ crud_php \ crud \ edit .php(2):include()#1 {main}在第40行的C:\ xampp \ htdocs \ crud_php \ crud \ control.php中抛出
我尝试过的事情:
执行编辑时发生此错误:
致命错误:未捕获错误:在C:\ xampp \ htdocs \ crud_php \ crud \ control.php:40中的布尔值上调用成员函数fetch_object():40堆栈跟踪:#0 C:\ xampp \ htdocs \ crud_php \ crud \ edit .php(2):include()#1 {main}在第40行的C:\ xampp \ htdocs \ crud_php \ crud \ control.php中抛出
when perform edit this error occured:
Fatal error: Uncaught Error: Call to a member function fetch_object() on boolean in C:\xampp\htdocs\crud_php\crud\control.php:40 Stack trace: #0 C:\xampp\htdocs\crud_php\crud\edit.php(2): include() #1 {main} thrown in C:\xampp\htdocs\crud_php\crud\control.php on line 40
What I have tried:
when perform edit this error occured:
Fatal error: Uncaught Error: Call to a member function fetch_object() on boolean in C:\xampp\htdocs\crud_php\crud\control.php:40 Stack trace: #0 C:\xampp\htdocs\crud_php\crud\edit.php(2): include() #1 {main} thrown in C:\xampp\htdocs\crud_php\crud\control.php on line 40
推荐答案
型号=新型号； if(isset(
model = new Model; if(isset(
_POST [''register''])){
_POST[''register''])) {
fname =
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