Learn how to a build a cloud-first strategyRegister Now

x
?
Solved

mySQLDump from PHP gives empty file

Posted on 2011-02-21
4
Medium Priority
?
702 Views
Last Modified: 2012-05-11
I'm trying to run mysqldump from PHP on a shared hosting server.  For some reason the dump is failing and  I'm getting a 0 length file.

I've included a code snippet and the results below.  Note that if I put in the "or die" it dies.
CODE SNIPPET
    //Verify that the DB and user info is good
    $dbLink = mysql_connect($custDBHost, $custDBUser,     $custDBPswd);
    print "dbLink = $dbLink<br><br>";
    $ok = mysql_select_db($custDBName, $dbLink);
    print "ok = $ok<br><br>";
	
    //Now try the dump	
    $command = "mysqldump --opt --h=$custDBHost --u=$custDBUser --p=$custDBPswd $custDBName  > $backupFile";
    system($command, $retVar); // or die('could not write file');
    print "retVar=$retVar";


OUTPUTOUTPUT
dbLink = Resource id #5

ok = 1

retVar=3

Open in new window

0
Comment
Question by:anAppBuilder
  • 2
  • 2
4 Comments
 
LVL 34

Accepted Solution

by:
Beverley Portlock earned 2000 total points
ID: 34945711
I'm a bit suspicious of this command

"mysqldump --opt --h=$custDBHost --u=$custDBUser --p=$custDBPswd $custDBName  > $backupFile";

Shouldn't those be single dashes? double dashes are for the complete words, so it should be -p or --password= and drop --opt unless it is for a very old version

try

"mysqldump -h $custDBHost  -u $custDBUser  -p $custDBP  $custDBName  > $backupFile";
or
"mysqldump -h $custDBHost  -u $custDBUser  --password=$custDBP $custDBName  > $backupFile";

because I think it prompts for just -p so --password= is better




0
 

Author Comment

by:anAppBuilder
ID: 34946210
Thank you bportlock.  

It still gets a 0 length file.  I posted the new snippet.

Is there a way to get more info about the error?
//Verify that the DB and user info is good
    $dbLink = mysql_connect($custDBHost, $custDBUser, $custDBPswd);
    print "dbLink = $dbLink<br><br>";
    $ok = mysql_select_db($custDBName, $dbLink);
    print "ok = $ok<br><br>";
		
    //run the command
    $command = "mysqldump -h $custDBHost -u $custDBUser -password=$custDBPswd $custDBName  > $backupFile";
    system($command, $retVar); // or die('could not write file');
    print "retVar=$retVar";

OUTPUT
dbLink = Resource id #5

ok = 1

retVar=2

Open in new window

0
 
LVL 34

Assisted Solution

by:Beverley Portlock
Beverley Portlock earned 2000 total points
ID: 34946314
Your command is incorrect. Use --password rather than -password (note the TWO leading dashes for a full word parameter, single dashes are for short parameters)  and make sure that all your variables contain valid data - no gaps or dots in database names and so forth
0
 

Author Comment

by:anAppBuilder
ID: 34946910
Thank you.  Adding the second dash works.
0

Featured Post

VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Containers like Docker and Rocket are getting more popular every day. In my conversations with customers, they consistently ask what containers are and how they can use them in their environment. If you’re as curious as most people, read on. . .
By, Vadim Tkachenko. In this article we’ll look at ClickHouse on its one year anniversary.
The viewer will learn how to look for a specific file type in a local or remote server directory using PHP.
In this video, Percona Solution Engineer Dimitri Vanoverbeke discusses why you want to use at least three nodes in a database cluster. To discuss how Percona Consulting can help with your design and architecture needs for your database and infras…
Suggested Courses
Course of the Month20 days, 22 hours left to enroll

810 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question