以下的文章主要介绍的是用PHP来实现MySQL备份的实际操作流程,我们大家都知道用PHP来实现MySQL备份可以说在实际应用频率还是比较大的,以下的文章主要描述的是用PHP来实现MySQL备份的实际操作流程。 看了下phpMyadmin和Discuz!的代码,呵呵,于是偷抄了Disc
以下的文章主要介绍的是用PHP来实现MySQL备份的实际操作流程,我们大家都知道用PHP来实现MySQL备份可以说在实际应用频率还是比较大的,以下的文章主要描述的是用PHP来实现MySQL备份的实际操作流程。
看了下phpMyadmin和Discuz!的代码,呵呵,于是偷抄了Discuz!的代码,形成了如下备份数据库的方法。(在这里感谢Discuz!的开发者)
备份数据库有两种方式,一种是只备份数据库的结构,一种把是结构和所有的数据都备份出来,当然是第二种方法好啦,不过我为了考虑可能的需求就都作啦。
备份数据库结构
函数名称:table2sql()
函数功能:把表的结构转换成为SQL
函数参数:$table: 要进行提取的表名
返 回 值:返回提取后的结果,SQL集合
函数作者:heiyeluren
<p></p><ol class="dp-xml"> <li><span>function table2sql($table) </span></li> <li class="alt"><span>{ </span></li> <li><span>global $db; </span></li> <li class="alt"> <span>$</span><span class="attribute">tabledump</span><span> = </span><span class="attribute-value">"DROP TABLE IF EXISTS $table;\n"</span><span>; </span> </li> <li> <span>$</span><span class="attribute">createtable</span><span> = $db-</span><span class="tag">></span><span>query("SHOW CREATE TABLE $table"); </span> </li> <li class="alt"> <span>$</span><span class="attribute">create</span><span> = $db-</span><span class="tag">></span><span>fetch_row($createtable); </span> </li> <li> <span>$tabledump </span><span class="attribute">.</span><span>= $create[1].";\n\n"; </span> </li> <li class="alt"><span>return $tabledump; </span></li> <li><span>} </span></li> </ol>
备份数据库结构和所有数据/*
函数名称:data2sql()
函数功能:把表的结构和数据转换成为SQL
函数参数:$table: 要进行提取的表名
返 回 值:返回提取后的结果,SQL集合
函数作者:heiyeluren
<ol class="dp-xml"> <li class="alt"><span><span>function data2sql($table) </span></span></li> <li><span>{ </span></li> <li class="alt"><span>global $db; </span></li> <li> <span>$</span><span class="attribute">tabledump</span><span> = </span><span class="attribute-value">"DROP TABLE IF EXISTS $table;\n"</span><span>; </span> </li> <li class="alt"> <span>$</span><span class="attribute">createtable</span><span> = $db-</span><span class="tag">></span><span>query("SHOW CREATE TABLE $table"); </span> </li> <li> <span>$</span><span class="attribute">create</span><span> = $db-</span><span class="tag">></span><span>fetch_row($createtable); </span> </li> <li class="alt"> <span>$tabledump </span><span class="attribute">.</span><span>= $create[1].";\n\n"; </span> </li> <li> <span>$</span><span class="attribute">rows</span><span> = $db-</span><span class="tag">></span><span>query("SELECT * FROM $table"); </span> </li> <li class="alt"> <span>$</span><span class="attribute">numfields</span><span> = $db-</span><span class="tag">></span><span>num_fields($rows); </span> </li> <li> <span>$</span><span class="attribute">numrows</span><span> = $db-</span><span class="tag">></span><span>num_rows($rows); </span> </li> <li class="alt"> <span>while ($</span><span class="attribute">row</span><span> = $db-</span><span class="tag">></span><span>fetch_row($rows)) </span> </li> <li><span>{ </span></li> <li class="alt"> <span>$</span><span class="attribute">comma</span><span> = </span><span class="attribute-value">""</span><span>; </span> </li> <li> <span>$tabledump </span><span class="attribute">.</span><span>= </span><span class="attribute-value">"INSERT INTO $table VALUES("</span><span>; </span> </li> <li class="alt"> <span>for($</span><span class="attribute">i</span><span> = </span><span class="attribute-value">0</span><span>; $i </span><span class="tag"><span> $numfields; $i++) </span></span> </li> <li><span>{ </span></li> <li class="alt"> <span>$tabledump </span><span class="attribute">.</span><span>= $comma."'".</span>MySQL<span>_escape_string($row[$i])."'"; </span> </li> <li> <span>$</span><span class="attribute">comma</span><span> = </span><span class="attribute-value">","</span><span>; </span> </li> <li class="alt"><span>} </span></li> <li> <span>$tabledump </span><span class="attribute">.</span><span>= </span><span class="attribute-value">");\n"</span><span>; </span> </li> <li class="alt"><span>} </span></li> <li> <span>$tabledump </span><span class="attribute">.</span><span>= </span><span class="attribute-value">"\n"</span><span>; </span> </li> <li class="alt"><span>return $tabledump; </span></li> <li><span>} </span></li> </ol>
具体实现MySQL操作
好,我们既然把代码都写出来了,那么我们如何在具体的程序种去实现MySQL备份呢,我们看下面的代码。备份数据库
注意:我们一下的数据库操作采用了phplib的DB类
定义要保存的数据表、前缀、保存到何处
$tables = array('us_sort', 'us_download', 'us_article', 'us_guestbook'); //定义要保存的数据表,一个数组
$prefix = 'us_';// 要保存的.sql文件的前缀
$saveto = 'server'; // 要保存到什么地方,是本地还是服务器上,默认是服务器
$back_mode = 'all'; // 要保存的方式,是全部备份还是只保存数据库结构
$admin = 'heiyeluren'; //管理员名称
$admin_email = 'heiyeluren@163.com';// 管理员邮箱
// 定义数据保存的文件名
$local_filename = $prefix.date('Ymd_His').'.sql"';
if (!$filename) { $filename = $db_backup_path . $prefix . date('Ymd_His_'). create_check_code(4) . ".sql"; }
$filename = $prefix.date(Ymd_His). create_check_ code(6).".sql";// 保存在服务器上的文件名
// 注意后面的create_check_code()函数,这是一个生成随机码的函数,详细可以参考:
// http://blog.csdn.net/heiyeshuwu/archive/2005/01/26/268446.aspx
// 获取数据库结构和数据内容
<ol class="dp-xml"> <li class="alt"><span><span>foreach($tables as $table) </span></span></li> <li><span>{ </span></li> <li class="alt"> <span>if ($</span><span class="attribute">back_mode</span><span> == 'all') { $sqldump </span><span class="attribute">.</span><span>= </span><span class="attribute-value">data2sql</span><span>($table); } </span> </li> <li> <span>if ($</span><span class="attribute">back_mode</span><span> == 'table') { $sqldump </span><span class="attribute">.</span><span>= </span><span class="attribute-value">table2sql</span><span>($table); } </span> </li> <li class="alt"><span>} </span></li> </ol>
// 如果数据内容不是空就开始保存
if(trim($sqldump))
{
// 写入开头信息
$sqldump =
"# --------------------------------------------------------\n".
"# 数据表备份\n".
"#\n".
"# 服务器: $db->Host\n".
"# 数据库:$db->Database\n".
"# 备份编号: ". create_sess_id() ."\n". // 这里有一个生成session id的函数
"# 备份时间: ".time_to_date('',6)."\n". // 这里就是获取当前时间的函数
"#\n".
"# 管理员:$admin ($admin_email)\n". // 管理员的用户名和邮箱地址
"# $copyright\n".
"# --------------------------------------------------------\n\n\n".
$sqldump;
保存到本地
<ol class="dp-xml"> <li class="alt"><span><span>if($</span><span class="attribute">saveto</span><span> == "local") </span></span></li> <li><span>{ </span></li> <li class="alt"><span>ob_end_clean(); </span></li> <li><span>header('Content-Encoding: none'); </span></li> <li class="alt"><span>header('Content-Type: '.(strpos($HTTP_SERVER_VARS['HTTP_USER_AGENT'], 'MSIE') ? <p></p>'application/octetstream' : 'application/octet-stream')); </span></li> <li> <span>header('Content-Disposition: '.(strpos($HTTP_SERVER_VARS['HTTP_USER_AGENT'], 'MSIE') ? <p></p>'inline; ' : 'attachment; ').'</span><span class="attribute">filename</span><span>="'.$local_filename); </span> </li> <li class="alt"><span>header('Content-Length: '.strlen($sqldump)); </span></li> <li><span>header('Pragma: no-cache'); </span></li> <li class="alt"><span>header('Expires: 0'); </span></li> <li><span>echo $sqldump; </span></li> <li class="alt"><span>} </span></li> </ol>
保存到本地结束
保存在服务器
<ol class="dp-xml"> <li class="alt"><span><span>if($</span><span class="attribute">saveto</span><span> == "server") </span></span></li> <li><span>{ </span></li> <li class="alt"><span>if($filename != "") </span></li> <li><span>{ </span></li> <li class="alt"> <span>@$</span><span class="attribute">fp</span><span> = </span><span class="attribute-value">fopen</span><span>($filename, "w+"); </span> </li> <li><span>if ($fp) </span></li> <li class="alt"><span>{ </span></li> <li><span>@flock($fp, 3); </span></li> <li class="alt"><span>if(@!fwrite($fp, $sqldump)) </span></li> <li><span>{ </span></li> <li class="alt"><span>@fclose($fp); </span></li> </ol>
exit_msg("数据文件无法保存到服务器,请检查目录属性你是否有写的权限。");
}
else
{
exit_msg("数据成功备份至服务器 $filename 中。");
}
}
else
{
exit_msg("无法打开你指定的目录". $filename .",请确定该目录是否存在,或者是否有相应权限");
}
}
else
{
exit_msg("您没有输入备份文件名,请返回修改。");
}
}
// 保存到服务器结束
}
else
{
exit_msg("数据表没有任何内容");
}
备份数据库结束
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