/**
* 还原数据库
*/
public function import($time = 0, $part = null, $start = null){
if(is_numeric($time) && is_null($part) && is_null($start)){ //初始化
//获取备份文件信息
$name = date('Ymd-His', $time) . '-*.sql*';
$path = realpath(C('DATA_BACKUP_PATH')) . DIRECTORY_SEPARATOR . $name;
$files = glob($path);
$list = array();
foreach($files as $name){
$basename = basename($name);
$match = sscanf($basename, '%4s%2s%2s-%2s%2s%2s-%d');
$gz = preg_match('/^\d{8,8}-\d{6,6}-\d+\.sql.gz$/', $basename);
$list[$match[6]] = array($match[6], $name, $gz);
}
ksort($list);
//检测文件正确性
$last = end($list);
if(count($list) === $last[0]){
session('backup_list', $list); //缓存备份列表
$this->success('初始化完成！', '', array('part' => 1, 'start' => 0));
} else {
$this->error('备份文件可能已经损坏，请检查！');
}
} elseif(is_numeric($part) && is_numeric($start)) {
$list = session('backup_list');
$db = new Database($list[$part], array(
'path' => realpath(C('DATA_BACKUP_PATH')) . DIRECTORY_SEPARATOR,
'compress' => $list[$part][2]));
$start = $db->import($start);
if(false === $start){
$this->error('还原数据出错！');
} elseif(0 === $start) { //下一卷
if(isset($list[++$part])){
$data = array('part' => $part, 'start' => 0);
$this->success("正在还原...#{$part}", '', $data);
} else {
session('backup_list', null);
$this->success('还原完成！');
}
} else {
$data = array('part' => $part, 'start' => $start[0]);
if($start[1]){
$rate = floor(100 * ($start[0] / $start[1]));
$this->success("正在还原...#{$part} ({$rate}%)", '', $data);
} else {
$data['gz'] = 1;
$this->success("正在还原...#{$part}", '', $data);
}
}
} else {
$this->error('参数错误！');
}
}
/**
* 备份数据库
* @param String $tables 表名
* @param Integer $id 表ID
* @param Integer $start 起始行数
* @author 麦当苗儿 <*****@*****.**>
*/
public function export($tables = null, $id = null, $start = null){
if(IS_POST && !empty($tables) && is_array($tables)){ //初始化
//读取备份配置
$config = array(
'path' => realpath(C('DATA_BACKUP_PATH')) . DIRECTORY_SEPARATOR,
'part' => C('DATA_BACKUP_PART_SIZE'),
'compress' => C('DATA_BACKUP_COMPRESS'),
'level' => C('DATA_BACKUP_COMPRESS_LEVEL'),
);
//检查是否有正在执行的任务
$lock = "{$config['path']}backup.lock";
if(is_file($lock)){
$this->error('检测到有一个备份任务正在执行，请稍后再试！');
} else {
//创建锁文件
file_put_contents($lock, NOW_TIME);
}
//检查备份目录是否可写
is_writeable($config['path']) || $this->error('备份目录不存在或不可写，请检查后重试！');
session('backup_config', $config);
//生成备份文件信息
$file = array(
'name' => date('Ymd-His', NOW_TIME),
'part' => 1,
);
session('backup_file', $file);
//缓存要备份的表
session('backup_tables', $tables);
//创建备份文件
$Database = new Database($file, $config);
if(false !== $Database->create()){
$tab = array('id' => 0, 'start' => 0);
$this->success('初始化成功！', '', array('tables' => $tables, 'tab' => $tab));
} else {
$this->error('初始化失败，备份文件创建失败！');
}
} elseif (IS_GET && is_numeric($id) && is_numeric($start)) { //备份数据
$tables = session('backup_tables');
//备份指定表
$Database = new Database(session('backup_file'), session('backup_config'));
$start = $Database->backup($tables[$id], $start);
if(false === $start){ //出错
$this->error('备份出错！');
} elseif (0 === $start) { //下一表
if(isset($tables[++$id])){
$tab = array('id' => $id, 'start' => 0);
$this->success('备份完成！', '', array('tab' => $tab));
} else { //备份完成，清空缓存
unlink(session('backup_config.path') . 'backup.lock');
session('backup_tables', null);
session('backup_file', null);
session('backup_config', null);
$this->success('备份完成！');
}
} else {
$tab = array('id' => $id, 'start' => $start[0]);
$rate = floor(100 * ($start[0] / $start[1]));
$this->success("正在备份...({$rate}%)", '', array('tab' => $tab));
}
} else { //出错
$this->error('参数错误！');
}
}
