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数据表迁徙数据一致性验证

Jun 13, 2016 pm 12:18 PM
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数据表迁移数据一致性验证

  在迁移数据库的时候做一些必要的验证还是很有用的,比如说迁移前后的数据条数是否一致,数据是否一致,这个时候怎么办呢,验证条数还好说,要是验证数据是否一致呢,对于重要的数据当然要每条都不会有差错,随机抽样验证肯定是不行的,万一遗漏了就麻烦了,而且两张表不再同一台服务器上。这个时候该怎么办呢,有一种方法:

  1. 从表中选取几个重要字段,比如说A、B、C,用这几个字段作为比对的标尺。
  2. 从原表中导出每条数据的这三个字段到一个文件f1中。
  3. 从目的表中到处每条数据的这三个字段到文件f2中。
  4. 比对文件f1、f2文件中的每条数据是否相同。
  5. 得出结论

  上面这种方法是同时想出来的,也还不错,但我觉得还有改进的余地:

  • 首先就是不是所有字段,仍然有可能在非主要字段出现different。
  • 整体效率比较低

  我的想法是这样:

  1. 对表中的每n条数据进行拼接(直接连接起来,n取值取决于每条数据的数据量大小)。
  2. 计算这n条数据的md5值,添加到文件f1中,直到所有数据取值完成。
  3. 对目的表也一样,记录的文件f2中。
  4. 比对文件f1、f2文件的md5值,如果一致,ok,成功。
  5. 如果不一致,从上倒下比对每条md5值,找到第m条不一致。
  6. 得出结论,不一致的数据在m*(n-1)+1 ~ m*n之间,可以再次选择定位。

  第二种方法的好处就是输出文件会在一定范围缩小,比对方便,但是也有缺点,不能像第一种方法一样直接通过关键字段定位不同数据的位置。

  下面是第二种方法效果和的具体代码实现:

<?php/** * 使用方法:  * php -f mysql_diff.php 	yes 			dir 						10 * 		               		是否计算条数	是否计算输出d5并保存到文件	合并数据的级别 * */if(php_sapi_name() != 'cli'){	die("请在CLI模式下运行");}array_shift($argv);if(empty($argv)){	die("at letase contain one info");}$is_count = array_shift($argv);$is_md5 = empty($argv) ? false : array_shift($argv);$conbine_num = empty($argv) ? 1 : intval(array_shift($argv));if($is_md5 && !is_dir($is_md5) && !mkdir($is_md5, 777, true)){	die("error info : md5 info must be input to a file");}$dbinfos = array(	'host' => 'localhost',	'port' => '3306',	'user' => 'root',	'pswd' => '123456',	'charset' => 'utf8',	'tables' => array(		'lagou.pos',		'lagou.pos_innodb',	),);//验证格式if(!$link = mysql_connect($dbinfos['host'].":".$dbinfos['port'],$dbinfos['user'], $dbinfos['pswd'])){	die("connect to [{$host}@{$port}] failed!!");}if(!mysql_query("set names {$dbinfos['charset']}")){	die("set charset error : ".mysql_error());}foreach ($dbinfos['tables'] as $table) {	if($is_count)	{		$sql = "select count(*) as nums from {$table}";		$ret = mysql_query($sql);		if(!$ret)		{			die("error : ".mysql_error());		}		$ret = mysql_fetch_array($ret, MYSQL_ASSOC);		echo "{$table} : {$ret['nums']}\n";	}			if($is_md5)	{		$path = $is_md5.DIRECTORY_SEPARATOR.$table;		$sql = "select * from {$table}";		$ret = mysql_query($sql);		$flag = 0;		$fields = '';		while ($_ret = mysql_fetch_array($ret, MYSQL_NUM)) {			$flag++;			while($_ret)			{				$fields .= array_pop($_ret);			}			if($flag % $conbine_num == 0)			{				file_put_contents($path, md5($fields)."\n", FILE_APPEND);				$fields = '';			}		}		if($flag % $conbine_num != 0 && $flag > 0)		{			file_put_contents($path, md5($fields)."\n", FILE_APPEND);		}		echo "save to file info : ".realpath($path)."\n";	}}
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