problem in my program

[pranjalgoenka]

dear all 

 

my code is showing error as Invalid query: No database selected

the code is as follows

 

<?php

$dbc = mysql_connect("localhost", "root", "123456"); 

mysql_select_db("ahamdabad_vpn_ip$", $dbc);

$sql = "select main_system from ahamdabad_vpn_ip$";

$result = mysql_query($sql);

if (!$result) 

{ 

    die('Invalid query: ' . mysql_error());

}

$username_array = array(); 

 

while($row=mysql_fetch_array($result))

{

  $username_array[] = "\"".$row[main_system]."\""; 

}

 

$username_string = implode(",", $username_array); 

 

echo $username_string;

?>

[PravinS]

mysql_select_db("ahamdabad_vpn_ip$", $dbc);

$sql = "select main_system from ahamdabad_vpn_ip$";

 

 

"ahamdabad_vpn_ip$" is you database or table name?

 

also it is not good practice to use "$" in database of table name

[pranjalgoenka]

ahamdabad_vpn_ip$ is a table. and i don't think if it matters if we have a $ sign at the last

[gristoi]

well there is your problem, look at the method mysql_select_db 

the clue is in the name, you are trying to set the db to use with your table name. set the correct db name. also PravinS is correct, you shouldnt be using variable strings in database connection. this leaves you wide open to sql injection and other vulnerabilities

[pranjalgoenka]

thanks but after correcting that it is showing undefined variable error for main_system in

while($row=mysql_fetch_array($result))

{

  $username_array[] = "\"".$row[main_system]."\""; 

}