php - Fatal error: Call to a member function query() on a non-object Error -


i have small problem. i'm trying make simple register/login system sessions , got error:

fatal error: call member function query() on non-object in c:\xampp\htdocs\members\includes\login.inc.php on line 9

this relevant line of code:

$result = $conn->query($sql);

the first time tried working.

the rest of code:

<?php if ($_server['request_method'] == 'post') {     $email      = $_post['email'];     $password   = md5($_post['password']);     $sql = "select email, password member email = '$email' , password = '$password'";     $result = $conn->query($sql);

i have db.php, used connect mysql , inside fine.

i cannot understand why, first time tried working guess , kind of error.

i'm having db.php used connect mysql , inside fine.. explain me why keep facing error ?

i'm going speculate. i'm speculating have separate file (probably called db.php) "handles" setting of database connection. i'm further going speculate you've chain of files require() (or include())'d web app.

i've seen more times care recall. it's old fashioned way of separating code logical chunks inside php - needs left in past.

i'm speculating defining $conn in script included (or required) before code. global variable, had dependency later in code execution. invisible file declared in.

that's problem. quick/hack fix rename $conn or restore original declaration of , make sure it's global , make sure included before code ran.

the proper fix (imho) @ using framework (laravel, lumen, codeigniter, yii, there many - take pick) , read on topics of dependency injection, autoloading , namespacing. think why global variable declarations make unmaintainable code.

if you're reluctant go full framework, @ least have @ database-abstraction libraries doctrine (and it's sub-library dbal) can auto-loaded project via composer.


Comments

Post a Comment

Popular posts from this blog

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m...
Read more

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

sql server - Why does Linq-to-SQL add unnecessary COUNT()? -

here tables: create table customer ( cid int primary key, name varchar(32) ) create table ord ( oid int primary key, cid int foreign key references customer, address varchar(20) ) here's linq-to-sql statement: var aaa = c in db.customer select new { c, o = c.ord.tolist() }; and here's inexplicable query generated linq-to-sql: select [t0].[cid] [cid], [t0].[name] [name], [t1].[oid] [oid], [t1].[cid] [cid2], [t1].[address] [address], (select count(*) [dbo].[ord] [t2] [t2].[cid] = [t0].[cid]) [value] [dbo].[customer] [t0] left outer join [dbo].[ord] [t1] on [t1].[cid] = [t0].[cid] order [t0].[cid], [t1].[oid] i want understand how rid of count(*) part. it's entirely uncalled for! linq needs count(*) in order determine number of entries returned o = c.ord.tolist() .
Read more