mysql_fetch_assoc(): supplied argument is not a valid MySQL [duplicate] - php

Question

This question already has answers here:
mysql_fetch_array()/mysql_fetch_assoc()/mysql_fetch_row()/mysql_num_rows etc... expects parameter 1 to be resource
(31 answers)
Closed 9 years ago.
I have created an android application,by using this function in php i am creating a
a new user in database mysql.
function signUp($sName, $sMobile, $sAddress, $sEmail, $sPwd)
{
$sql = "insert into customers (name,mobile,address,email,pwd) values ('$sName','$sMobile','$sAddress','$sEmail','$sPwd')";
$run = $this->query($sql);
if ($this->result <= 0) {
return false;
} else {
return $this->json('DATA');
}
}
With the below function i am querying in database and returning the response in json format
function query($sql){
$query = mysql_query($sql) or die(mysql_error());
while ($row = mysql_fetch_assoc($query)){
$this->result[] = $row;
}
return $this;
}
but the response i am getting has an error i tried surpessing the warnings by using
#mysql_fetch_assoc($query)
It gave a proper response in browser but android gets null as response
Error:
Warning: mysql_fetch_assoc(): supplied argument is not a valid MySQL
result resource in
Warning: Cannot modify header information - headers already sent by
(output started at
Help required New to PHP. Thanks in advance

Answer 1

INSERT QUERY does not return RESULT SET
Only SELECT query returns result set

Answer 2

You can't get result by Insert Query but you can get id of current inserted user by mysql_insert_id() and then you can use "Select Query" against that id.

Answer 3

Well, the thing is that Your query is INSERT query and, according, to PHP Manual, in successful query it return true, not mysql object. So function "mysql_fetch_assoc($query)" cannot be ran because it requests mysql object as parameter not only TRUE.
Also, I recommend to start using MySQLi or PDO extensions, instead of mysql_* functions.
For SELECT, SHOW, DESCRIBE, EXPLAIN and other statements returning
resultset, mysql_query() returns a resource on success, or FALSE on
error.
For other type of SQL statements, INSERT, UPDATE, DELETE, DROP, etc,
mysql_query() returns TRUE on success or FALSE on error.
The returned result resource should be passed to mysql_fetch_array(),
and other functions for dealing with result tables, to access the
returned data.
Use mysql_num_rows() to find out how many rows were returned for a
SELECT statement or mysql_affected_rows() to find out how many rows
were affected by a DELETE, INSERT, REPLACE, or UPDATE statement.
mysql_query() will also fail and return FALSE if the user does not
have permission to access the table(s) referenced by the query.