mysqldump generates 0kb sql file

问题:

I am working on backup and recovery of mySQL database using mysqldump. My code generates an sql file but its empty. Here's my complete code. Thanks a lot.

<?    shell_exec("mysqldump -u root -p ilamdb > db/ilamdb.sql");    echo "Back up complete."; ?> 

回答1:

You used the option -p which tells mysqldump

shell_exec("mysqldump -u root --password=yourpassword ilamdb > db/ilamdb.sql"); 

If you don't use a password, simply leave out this parameter:

shell_exec("mysqldump -u root ilamdb > db/ilamdb.sql"); 

回答2:

MySQL backup syntax should be as below

mysqldump -u --password= >File.dmp

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