我正在尝试使用wamp服务器将我的phpadmin数据库连接到Android Studio，但不幸的是我在我的php代码中得到了以下错误，并且我尝试使用mysqli而不是mysql。你能帮忙吗？。
错误日志
错误
<font size='1'><table class='xdebug-error xe-fatal-error' dir='ltr' border='1' cellspacing='0' cellpadding='1'>
<tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>( ! )</span> Fatal error: Call to undefined method DB_Connect::query() in C:\wamp\www\bradvisor_login_api\include\DB_Functions.php on line <i>67</i></th></tr>
<tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>
<tr><th align='center' bgcolor='#eeeeec'>#</th><th align='left' bgcolor='#eeeeec'>Time</th><th align='left' bgcolor='#eeeeec'>Memory</th><th align='left' bgcolor='#eeeeec'>Function</th><th align='left' bgcolor='#eeeeec'>Location</th></tr>
<tr><td bgcolor='#eeeeec' align='center'>1</td><td bgcolor='#eeeeec' align='center'>0.0010</td><td bgcolor='#eeeeec' align='right'>269136</td><td bgcolor='#eeeeec'>{main}( )</td><td title='C:\wamp\www\bradvisor_login_api\index.php' bgcolor='#eeeeec'>..\index.php<b>:</b>0</td></tr>
<tr><td bgcolor='#eeeeec' align='center'>2</td><td bgcolor='#eeeeec' align='center'>0.0894</td><td bgcolor='#eeeeec' align='right'>310872</td><td bgcolor='#eeeeec'>DB_Functions->storeUser( )</td><td title='C:\wamp\www\bradvisor_login_api\index.php' bgcolor='#eeeeec'>..\index.php<b>:</b>136</td></tr>
</table></font>
07-17 11:39:17.449 6463-6549/com.bradvisor.bradvisor E/JSON Parser﹕ Error parsing data org.json.JSONException: Value <br of type java.lang.String cannot be converted to JSONObject
07-17 11:39:17.473 6463-6463/com.bradvisor.bradvisor E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.bradvisor.bradvisor, PID: 6463
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String org.json.JSONObject.getString(java.lang.String)' on a null object reference
DBFunctions.php文件
<?php
class DB_Functions {
private $db;
//put your code here
// constructor
function __construct() {
require_once 'DB_Connect.php';
// connecting to database
$this->db = new DB_Connect();
$this->db->connect();
}
// destructor
function __destruct() {
}
/**
* Random string which is sent by mail to reset password
*/
public function random_string()
{
$character_set_array = array();
$character_set_array[] = array('count' => 7, 'characters' => 'abcdefghijklmnopqrstuvwxyz');
$character_set_array[] = array('count' => 1, 'characters' => '0123456789');
$temp_array = array();
foreach ($character_set_array as $character_set) {
for ($i = 0; $i < $character_set['count']; $i++) {
$temp_array[] = $character_set['characters'][rand(0, strlen($character_set['characters']) - 1)];
}
}
shuffle($temp_array);
return implode('', $temp_array);
}
public function forgotPassword($forgotpassword, $newpassword, $salt){
$result = mysqli_query("UPDATE `users` SET `encrypted_password` = '$newpassword',`salt` = '$salt'
WHERE `email` = '$forgotpassword'");
if ($result) {
return true;
}
else
{
return false;
}
}
/**
* Adding new user to mysql database
* returns user details
*/
public function storeUser($fname, $lname, $email, $uname, $password) {
$uuid = uniqid('', true);
$hash = $this->hashSSHA($password);
$encrypted_password = $hash["encrypted"]; // encrypted password
$salt = $hash["salt"]; // salt
$result = mysqli_query("INSERT INTO users(unique_id, firstname, lastname, email, username, encrypted_password, salt, created_at) VALUES('$uuid', '$fname', '$lname', '$email', '$uname', '$encrypted_password', '$salt', NOW())"); // This is Line 67 where it brings an error.
// check for successful store
if ($result) {
// get user details
$uid = mysqli_insert_id(); // last inserted id
$result = mysqli_query("SELECT * FROM users WHERE uid = $uid");
// return user details
return mysqli_fetch_array($result);
} else {
return false;
}
}
/**
* Verifies user by email and password
*/
public function getUserByEmailAndPassword($email, $password) {
$result = mysqli_query("SELECT * FROM users WHERE email = '$email'") or die(mysqli_error());
// check for result
$no_of_rows = mysqli_num_rows($result);
if ($no_of_rows > 0) {
$result = mysqli_fetch_array($result);
$salt = $result['salt'];
$encrypted_password = $result['encrypted_password'];
$hash = $this->checkhashSSHA($salt, $password);
// check for password equality
if ($encrypted_password == $hash) {
// user authentication details are correct
return $result;
}
} else {
// user not found
return false;
}
}
/**
* Check user is existed or not
*/
public function isUserExisted($email) {
$result = mysqli_query("SELECT email from users WHERE email = '$email'");
$no_of_rows = mysqli_num_rows($result);
if ($no_of_rows > 0) {
// user existed
return true;
} else {
// user not existed
return false;
}
}
/**
* Encrypting password
* returns salt and encrypted password
*/
public function hashSSHA($password) {
$salt = sha1(rand());
$salt = substr($salt, 0, 10);
$encrypted = base64_encode(sha1($password . $salt, true) . $salt);
$hash = array("salt" => $salt, "encrypted" => $encrypted);
return $hash;
}
/**
* Decrypting password
* returns hash string
*/
public function checkhashSSHA($salt, $password) {
$hash = base64_encode(sha1($password . $salt, true) . $salt);
return $hash;
}
}
?>
答案 0 :(得分：1)
当您调用mysqli_*函数时，您需要传递创建数据库连接时获得的链接/引用（mysqli_connect(...);调用返回的对象）。
查询调用类似于：
mysqli_query($link, "SELECT * FROM ...");
我个人建议使用mysqli的OOP样式而不是程序。
答案 1 :(得分：1)
mysqli_query使用2个参数，但你只使用一个，你需要设置$ link参数和$ query，如下所示：
$ link = mysqli_connect（“localhost”，“my_user”，“my_password”，“world”）;
mysqli_query（$ link，“CREATE TEMPORARY TABLE myCity LIKE City”）;
查看手册：http://php.net/manual/es/mysqli.query.php
运气！
答案 2 :(得分：0)
mysqli_query at list Two argument pass 1 is connection string and 2 is query
for Example
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
if (mysqli_query($link, "CREATE TEMPORARY TABLE myCity LIKE City") === TRUE) {
printf("Table myCity successfully created.\n");
}