How to perform data backup operation in ThinkPHP6?-ThinkPHP-php.cn

How to perform data backup operation in ThinkPHP6?

王林

Release： 2023-06-12 10:27:42

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With the continuous development of Internet applications, data backup is receiving more and more attention. In order to ensure data security, developers need to master data backup operation skills. This article focuses on how to perform data backup operations in ThinkPHP6.

1. Backup Principle

Before backing up, we need to understand the principle of backup. Database backup refers to copying the data in the database to another server or a local hard disk to prevent data loss, malicious tampering or system crash.

In ThinkPHP6, you can directly use the data backup class provided by the framework to complete the backup operation. The backup will copy all table structures and data of the database to a .sql file to facilitate data restoration or migration when needed.

2. Backup configuration

Before performing data backup, we need to configure the backup operation to ensure the correctness of the backup operation.

Add the following configuration to the database configuration file:

return [
    // 数据库类型
    'type'            => 'mysql',
    // 服务器地址
    'hostname'        => '127.0.0.1',
    // 数据库名
    'database'        => 'database_name',
    // 用户名
    'username'        => 'root',
    // 密码
    'password'        => 'password',
    // 端口
    'hostport'        => '',
    // 数据库连接参数
    'params'          => [],
    // 数据库编码默认采用utf8
    'charset'         => 'utf8',
    // 数据库表前缀
    'prefix'          => '',
    // 是否需要进行SQL性能分析
    'sql_explain'     => false,
    // 是否需要进行数据备份
    'backup'          => true,
    // 数据备份目录
    'backup_path'     => '/backup/',
    // 数据备份文件的最大卷大小(字节)
    'backup_max_size' => 100 * 1024 * 1024,
    // 数据库备份文件命名格式
    'backup_name'     => '',
];

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Among them, 'backup' is set to true to indicate the need for data backup; 'backup_path' indicates the storage directory of the backup file; 'backup_max_size' Indicates the maximum volume size of the backup file; 'backup_name' indicates the naming format of the backup file.

3. Perform backup operation

After completing the backup configuration, we can perform the backup operation. The ThinkPHP6 framework provides a data backup class, which can complete the backup operation by calling relevant methods. The specific code is as follows:

use thinkDb;
use thinkacadeConfig;
use thinkacadeCache;

class Backup
{
    protected $options = [
        'path' => '',
        'part' => '',
        'compress' => 0,
        'level' => 9,
        'lock' => true,
    ];
    
    protected $config;
    
    public function __construct()
    {
        // 获取数据库配置
        $this->config = Config::get('database');
    }
    
    // 备份数据库
    public function backup()
    {
        $database = $this->config['database'];
        $path = $this->config['backup_path'];
        $part = isset($this->config['backup_part_size']) ? $this->config['backup_part_size'] : $this->options['part'];
        $compress = isset($this->config['backup_compress']) ? $this->config['backup_compress'] : $this->options['compress'];
        $level = isset($this->config['backup_compress_level']) ? $this->config['backup_compress_level'] : $this->options['level'];
        
        // 检查备份目录是否存在
        if (!is_dir($path)) {
            mkdir($path, 0755, true);
        }
        
        // 初始化
        $file = [
            'name' => $database . '_' . date('YmdHis'),
            'part' => 1,
        ];
        
        // 获取表结构
        $sql = "SHOW TABLES";
        $result = Db::query($sql, true);
        
        // 遍历所有表备份数据
        foreach ($result as $val) {
            $sql = "SHOW CREATE TABLE `" . $val['Tables_in_' . $database] . "`";
            $res = Db::query($sql, true);
            $sql = "--
";
            foreach ($res as $row) {
                $sql .= $row['Create Table'] . ";

";
            }
            
            $start = 0;
            $size = 1000;
            $table = $val['Tables_in_' . $database];
            
            // 备份数据
            while (true) {
                $sqls = "SELECT * FROM `" . $table . "` LIMIT {$start}, {$size}";
                $result = Db::query($sqls, true);
                $numRows = count($result);
                if ($numRows < 1) {
                    break;
                }
                
                $sql .= "--
";
                $sql .= "-- dump data for {$table} 
";
                $sql .= "--
";
                
                foreach ($result as $row) {
                    $row = array_map('addslashes', $row);
                    $sql .= "INSERT INTO `{$table}` VALUES ('" . implode("','", $row) . "');
";
                }
                
                $start += $numRows;
            }
            
            // 写入SQL语句
            $this->write($sql, $file);
        }
        
        // 结束备份流程
        $this->config = [];
        
        return true;
    }
    
    // 写入SQL语句
    protected function write($sql, &$file)
    {
        $size = strlen($sql);
        
        if ($size + $file['part'] <= $this->config['backup_max_size']) {
            $file['sql'] .= $sql;
        } else {
            $this->save($file);
            $file['sql'] = $sql;
            $file['part']++;
        }
    }
    
    // 保存备份文件
    protected function save(&$file)
    {
        $name = $file['name'] . "_" . $file['part'] . ".sql";
        $path = $this->config['backup_path'] . $name;
        $sql = $file['sql'];
        
        if ($file['compress'] && function_exists('gzcompress')) {
            $sql = gzcompress($sql, $file['level']);
        }
        
        if ($this->config['backup_lock']) {
            $lock = "{$this->config['backup_path']}backup.lock";
            file_put_contents($lock, time());
        }
        
        file_put_contents($path, $sql);
    }
}

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Specifically, the Backup class provides the backup method, which uses the Db class to obtain the database table structure and data, then splices it into a SQL statement, and finally writes it to the backup file.

4. Summary

This article introduces the configuration and implementation method of database backup operation in ThinkPHP6. Backup operations are very important for data security and migration. Developers need to always pay attention to the data backup situation and perform backup operations when necessary.

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