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HomeDatabaseMysql Tutorial从MySQL导入导出大量数据的程序实现方法_MySQL

从MySQL导入导出大量数据的程序实现方法_MySQL

Jun 01, 2016 pm 02:11 PM
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  大家一定使用过 phpmyadmin 里面的数据库导入,导出功能,非常方便。但是在实际应用中,我发现如下几个问题:
  
  1 数据库超过一定尺寸,比如6M 这时使用导出一般没问题,可以正确的保存到本机硬盘上面,但是导入则不行!原因是:一般的 PHP.INI 里面设置临时文件/上传文件的大小限制为2M,而phpmyadmin使用了上传的方式,造成失败。
  
  2 导出到硬盘的 .SQL 文件在导回时,经常出现由于某些单引号的问题引起失败,造成导入失败,只能用 mysql等应用程序导入了。
  
  我的数据库已经超过10M,所以必须解决这个问题。我的思路:
  
  导出: 用phpmyadmin 保存数据库/表格结构,用脚本读取数据库内容并保存到文件里面!
  导入: 用phpmyadmin 恢复数据库/表格结构,用脚本读取文件,然后保存到库里面!
  
  导出程序如下:调用方法为 ****.php?table=tablename
  这个简单的程序目前一次保存一个表格!!每行为一个字段的数据!!
  
    if($table==\"\")exit();
  mysql_connect(\"localhost\",\"name\",\"password\");
  mysql_select_db(\"database\");
  $result = mysql_query(\"select * from $table\");
  if(mysql_num_rows($result)   echo \"开始转换数据到文本...
  \";
  $handle = fopen(\"$table.txt\",\"w\");
  $numfields = mysql_num_fields($result);
  fputs($handle,$numfields.\"\r\n\");
  for($k=0;$k  {
  $msg = mysql_fetch_row($result);
  for($i=0;$i  {
  $msg[$i] = str_replace(\"\r\n\",\"&&php2000mysqlreturn&&\",$msg[$i]);
  $msg[$i] = str_replace(\"\n\" ,\"&&php2000mysqlreturn&&\",$msg[$i]);
  fputs($handle,$msg[$i].\"\r\n\");
  }
  fputs($handle,\"------- php2000 dump data program V1.0 for MySQL --------\r\n\");
  }
  fclose($handle);
  echo \"ok\";
  ?>
  
  导入的程序如下:用法同上面!
  
    if($table==\"\")exit();
  mysql_connect(\"localhost\",\"name\",\"password\");
  mysql_select_db(\"database\");
  $message = file(\"$table.txt\");
  echo $numfields = chop($message[0]);
  for($k=1;$k  {
  $value=\"\";
  for ($i=$k;$i  {
  $tmp = str_replace(\"&&php2000mysqlreturn&&\",\"\r\n\",chop($message[$i]));
  $value .= \"\'\".addslashes($tmp).\"\',\";
  }
  $tmp = str_replace(\"&&php2000mysqlreturn&&\",\"\r\n\",chop($message[$k+$numfields-1]));
  $value .= \"\'\".$tmp.\"\'\";
  $query = \"insert into $table values (\".$value.\")\";
  echo mysql_error();
  mysql_query($query);
  echo $k.\" \";
  }
  echo \"ok\";
  ?>
  
  使用方法和可能的问题!
  1 导入时 file()函数可能会有问题(我的10M的数据没出现问题),可以改为 fopen()然后没次读一行!!
  2 导入,导出都需要用 ftp 操作,也就是导出后,用 ftp 把数据转到本机,导入时先用ftp转移数据到服务器!
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