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　　導出txt格式：

　　// Load the DB utility class

　　$this->load->dbutil();

　　// Backup your entire database and assign it to a variable

　　$backup=&$this->dbutil->backup(array('format'=>'txt'));

　　// Load the file helper and write the file to your server

　　$this->load->helper('file');

　　write_file('backup.sql',$backup);

　　gzip格式：

　　// Load the DB utility class

　　$this->load->dbutil();

　　// Backup your entire database and assign it to a variable

　　$backup=&$this->dbutil->backup();

　　// Load the file helper and write the file to your server

　　$this->load->helper('file');

　　write_file('mybackup.gz',$backup);

　　zip格式

　　// Load the DB utility class

　　$this->load->dbutil();

　　// Backup your entire database and assign it to a variable

　　$backup=&$this->dbutil->backup(array('format'=>'zip'));

　　// Load the file helper and write the file to your server

　　$this->load->helper('file');

　　write_file('backup.zip',$backup);