我一直在研究CodeIgniter附带的用户指南。我对dbutil()方法非常感兴趣。特别是以下代码行：
// 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('/path/to/mybackup.gz', $backup);
// Load the download helper and send the file to your desktop
$this->load->helper('download');
force_download('mybackup.gz', $backup);
它应该备份当前加载的MySQL数据库。但不幸的是，它不起作用，我收到以下消息：
遇到PHP错误
严重性：通知
消息：未定义的属性：CI_Loader:：$dbutil
文件名：views/view.php
线路编号：10
致命错误：对中的非对象调用成员函数backup((C： 第10行上的''axamplep''htdocs''CodeIgniter''application''views''view.php
我在这里错过了什么？如有任何帮助，我们将不胜感激。
试试这个，如果你喜欢，你可以把zip格式改为gz：(
$this->load->dbutil();
$prefs = array(
'format' => 'zip',
'filename' => 'my_db_backup.sql'
);
$backup =& $this->dbutil->backup($prefs);
$db_name = 'backup-on-'. date("Y-m-d-H-i-s") .'.zip';
$save = 'pathtobkfolder/'.$db_name;
$this->load->helper('file');
write_file($save, $backup);
$this->load->helper('download');
force_download($db_name, $backup);
使用php只适用于非常小的数据库。如果你增加了其他性能问题，你会很快遇到内存限制。
最有效的方法是使用mysqldump:创建一个转储
header('Content-type: application/force-download');
header('Content-Disposition: attachment; filename="dbbackup.sql.gz"');
passthru("mysqldump --user=xx --host=xx --password=xx dbname | gzip");
当然，您必须具有执行此操作所需的权限。
//load helpers
$this->load->helper('file');
$this->load->helper('download');
$this->load->library('zip');
//load database
$this->load->dbutil();
//create format
$db_format=array('format'=>'zip','filename'=>'backup.sql');
$backup=& $this->dbutil->backup($db_format);
// file name
$dbname='backup-on-'.date('d-m-y H:i').'.zip';
$save='assets/db_backup/'.$dbname;
// write file
write_file($save,$backup);
// and force download
force_download($dbname,$backup);
function backup($fileName='db_backup.zip'){
// 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
$this->load->helper('file');
write_file(FCPATH.'/downloads/'.$fileName, $backup);
// Load the download helper and send the file to your desktop
$this->load->helper('download');
force_download($fileName, $backup);
}
使用codeigniter 备份数据库的简单方法
public function db_backup()
{
$this->load->helper('url');
$this->load->helper('file');
$this->load->helper('download');
$this->load->library('zip');
$this->load->dbutil();
$db_format=array('format'=>'zip','filename'=>'my_db_backup.sql');
$backup=& $this->dbutil->backup($db_format);
$dbname='backup-on-'.date('Y-m-d').'.zip';
$save='assets/db_backup/'.$dbname;
write_file($save,$backup);
force_download($dbname,$backup);
}`
如果您有幸在服务器上启用了exec()、shell_exec()、system()或passthru()中的一个。也许你想使用以下内容：
public function db_backup()
{
$DBUSER=$this->db->username;
$DBPASSWD=$this->db->password;
$DATABASE=$this->db->database;
$filename = $DATABASE . "-" . date("Y-m-d_H-i-s") . ".sql.gz";
$mime = "application/x-gzip";
header( "Content-Type: " . $mime );
header( 'Content-Disposition: attachment; filename="' . $filename . '"' );
// $cmd = "mysqldump -u $DBUSER --password=$DBPASSWD $DATABASE | gzip --best";
$cmd = "mysqldump -u $DBUSER --password=$DBPASSWD --no-create-info --complete-insert $DATABASE | gzip --best";
passthru( $cmd );
exit(0);
}
试试这个。。。它已经过测试。。。如果你打算使用mysqli，那么它会很好。。。你可以把你的代码放在你的控制器或模型中，但我建议把这个放在你自己的模型中；从您的controller调用此函数。。。
public function db_backup()
{
$this->load->dbutil();
$backup =& $this->dbutil->backup();
$this->load->helper('file');
write_file('your_file_path/your_DB.zip', $backup);
}
我对CodeIgniter非常陌生，但我成功地完成了备份。试试这个，它会成功工作，并且非常容易实现。在控制器中编写代码，并从视图页面调用用于备份的函数。做好准备，走吧，你就完了。
function dbbackup()
{
$this->load->dbutil();
$backup =& $this->dbutil->backup();
$this->load->helper('file');
write_file('<?php echo base_url();?>/downloads', $backup);
$this->load->helper('download');
force_download('mybackup.gz', $backup);
}
对于完整的应用程序备份，使用以下代码执行相同的过程：
function backup()
{
$this->load->helper('download');
$this->load->library('zip');
$time = time();
$this->zip->read_dir('D:xampp/htdocs/wms/');
$this->zip->download('my_backup.'.$time.'.zip');
}
在这里，您可以使用您选择的任何路径。
public function backup(){
$this->load->dbutil();
$config = array(
'format' => 'zip',
'filename' => 'insert-file-name.sql'
);
$backup =& $this->dbutil->backup($config);
$db_name = 'backup-on-'. date("Y-m-d-H-i-s") .'.zip';
$save = 'uploads/'.$db_name;
$this->load->helper('file');
write_file($save, $backup);
$this->load->helper('download');
force_download($db_name, $backup);
}
$content='SET SQL_MODE="NO_AUTO_ VALUE_ON_；；启动交易；SET time_ zone＝"+00:00"；"；
if($tables = $this->db->list_tables()){
foreach($tables as $table){
$content .= ' DROP TABLE IF EXISTS `' . $table . '`;';
$content .= $this->db->query('SHOW CREATE TABLE ' . $table)->row_array()['Create Table'] . ';';
$fields = $this->db->list_fields($table);
$table_data = $this->db->query('SELECT * FROM ' . $table)->result_array();
$insert_field = '';
$insert_values = '';
if($fields && $table_data){
$insert_field .= 'INSERT INTO `' . $table . '` (';
foreach($fields as $field){
$insert_field .= '`' . $field . '`,';
}
$insert_field = substr($insert_field,0,-1);
$insert_field .= ')';
$insert_values .= ' VALUES ';
foreach($table_data as $table_row){
$insert_values .= '(' ;
foreach($table_row as $column => $value){
$insert_values .= "'" . addslashes($value) . "',";
}
$insert_values = substr($insert_values,0,-1);
$insert_values .= '),';
}
$insert_values = substr($insert_values,0,-1) . '; ';
}
$content .= $insert_field . $insert_values;
}
}
$file_path = "./uploads/backup-" . date('Y-m-d') . ".sql";
$myfile = fopen($file_path, "w");
fwrite($myfile, $content);
fclose($myfile);
这些行是从代码点火器文档中获取的：
重要提示：为了初始化Utility类，您的数据库驱动程序必须已经在运行，因为实用程序类依赖于
调用此函数时，请检查数据库类是否已加载。或者，您可以在加载dbutil类$this->load->database(); 之前放置此行
试试这个！
$username = "root";
$password = "root";
$hostname = "localhost";
$dbname = "raas";
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename='.basename($dbname . "_" .date("Y-m-d_H-i-s").".sql"));
$command = "C:'AppServ'MySQL'bin'mysqldump --add-drop-table --host=$hostname --user=$username --password=$password ".$dbname;
system($command);
问题是在引导过程中很早就试图备份数据库。
当我试图破解CodeIgniter以使用备份我的数据库时，我遇到了同样的问题
$prefs = array(
'ignore'=> array('codes_cdt','codes_cpt','codes_icd10_dx_order','codes_icd10_pcs_order','pharma'),
'format'=>'gzip','filename','add_drop'=> TRUE,'add_insert'=>TRUE,'newline'=> "'n");
$filename = APPPATH.'''backups''' .'backup-' . date('d-m-Y') . ' .gz';
if(!file_exists($filename)){
get_instance()->load->dbutil();
file_put_contents( $filename, $this->dbutil->backup($prefs));
}
在我的config.php文件的底部。
把它移到一个模型上，允许它自动加载，你就可以了。
<?
// Try this one, this works FOR both codeigniter and core PHP
public function Export_Database()
{
date_default_timezone_set('GMT');
// Load the file helper in codeigniter
$this->load->helper('file');
$con = mysqli_connect("localhost","username","password","databasename");
$tables = array();
$query = mysqli_query($con, 'SHOW TABLES');
while($row = mysqli_fetch_row($query)){
$tables[] = $row[0];
}
$result = 'SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";';
$result .= 'SET time_zone = "+00:00";';
foreach($tables as $table){
$query = mysqli_query($con, 'SELECT * FROM `'.$table.'`');
$num_fields = mysqli_num_fields($query);
$result .= 'DROP TABLE IF EXISTS '.$table.';';
$row2 = mysqli_fetch_row(mysqli_query($con, 'SHOW CREATE TABLE `'.$table.'`'));
$result .= "'n'n".$row2[1].";'n'n";
for ($i = 0; $i < $num_fields; $i++) {
while($row = mysqli_fetch_row($query)){
$result .= 'INSERT INTO `'.$table.'` VALUES(';
for($j=0; $j<$num_fields; $j++){
$row[$j] = addslashes($row[$j]);
$row[$j] = str_replace("'n","''n",$row[$j]);
if(isset($row[$j])){
$result .= '"'.$row[$j].'"' ;
}else{
$result .= '""';
}
if($j<($num_fields-1)){
$result .= ',';
}
}
$result .= ");'n";
}
}
$result .="'n'n";
}
//Create Folder
$folder = 'database/';
if (!is_dir($folder))
mkdir($folder, 0777, true);
chmod($folder, 0777);
$date = date('m-d-Y');
$filename = $folder."db_filename_".$date;
$handle = fopen($filename.'.sql','w+');
fwrite($handle,$result);
fclose($handle);
redirect('Dashboard');
} // end Export_Database function
?>
如果您想归档数据库，请使用函数$this->archive_database((；该函数将.sql文件保存在根文件夹中名为archives的文件夹中
// to intialize the path split the real path by dot .
public function init_path($string){
$array_path = explode('.', $string);
$realpath = '';
foreach ($array_path as $p)
{
$realpath .= $p;
$realpath .= '/';
}
return $realpath;
}
// backup database function
public function archive_database($host = '',$user ='',$pass ='',$name ='', $path = '' , $download_allow = false , $tables=false, $backup_name=false){
$CI = &get_instance();
$CI->load->database();
if($path != '')
{
$path = realpath($this->init_path($path));
}else{
if (!is_dir('archives/'))
mkdir('archives/', 0777);
$path = realpath($this->init_path('archives'));
}
if($host == '')
{
$host = $CI->db->hostname;
}
if($user == '')
{
$user = $CI->db->username;
}
if($pass == '')
{
$pass = $CI->db->password;
}
if($name == '')
{
$name = $CI->db->database;
}
set_time_limit(3000);
$mysqli = new mysqli($host,$user,$pass,$name);
$mysqli->select_db($name);
$mysqli->query("SET NAMES 'utf8'");
$queryTables = $mysqli->query('SHOW TABLES');
while($row = $queryTables->fetch_row()) { $target_tables[] = $row[0]; }
if($tables !== false)
{ $target_tables = array_intersect( $target_tables, $tables); }
$content = "SET SQL_MODE = '"NO_AUTO_VALUE_ON_ZERO'";'r'nSET time_zone = '"+00:00'";'r'n'r'n'r'n/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;'r'n/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;'r'n/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;'r'n/*!40101 SET NAMES utf8 */;'r'n--'r'n-- Database: `".$name."`'r'n--'r'n'r'n'r'n";
foreach($target_tables as $table){
if (empty($table)){ continue; }
$result = $mysqli->query('SELECT * FROM `'.$table.'`');
$fields_amount=$result->field_count;
$rows_num=$mysqli->affected_rows;
$res = $mysqli->query('SHOW CREATE TABLE '.$table);
$TableMLine=$res->fetch_row();
$content .= "'n'n".$TableMLine[1].";'n'n";
for ($i = 0, $st_counter = 0; $i < $fields_amount; $i++, $st_counter=0) {
while($row = $result->fetch_row()) { //when started (and every after 100 command cycle):
if ($st_counter%100 == 0 || $st_counter == 0 ) {$content .= "'nINSERT INTO ".$table." VALUES";}
$content .= "'n("; for($j=0; $j<$fields_amount; $j++){ $row[$j] = str_replace("'n","''n", addslashes($row[$j]) ); if (isset($row[$j])){$content .= '"'.$row[$j].'"' ;} else{$content .= '""';} if ($j<($fields_amount-1)){$content.= ',';} } $content .=")";
//every after 100 command cycle [or at last line] ....p.s. but should be inserted 1 cycle eariler
if ( (($st_counter+1)%100==0 && $st_counter!=0) || $st_counter+1==$rows_num) {$content .= ";";} else {$content .= ",";} $st_counter=$st_counter+1;
}
} $content .="'n'n'n";
}
$content .= "'r'n'r'n/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;'r'n/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;'r'n/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;";
$backup_name = $backup_name ? $backup_name : $name."___(".date('H-i-s')."_".date('d-m-Y').")__rand".rand(1,11111111).".sql";
$fileLocation = $path .''''. $backup_name;
$file = fopen($fileLocation,"w");
fwrite($file,$content);
fclose($file);
if($download_allow){
ob_get_clean(); header('Content-Type: application/octet-stream'); header("Content-Transfer-Encoding: Binary"); header("Content-disposition: attachment; filename='"".$backup_name."'"");
}
echo $content; exit;
}
无需在路径添加base_url()