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php - Mysql数据备份转换成字符串

转载 作者:可可西里 更新时间:2023-11-01 06:50:50 26 4
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Note: The main thing which I want to know is how to stop converting integers and bits to string using php. I dont want to use mysqldump as many Servers are not giving access to shells and I had tested it. Thats why, I am using PHP

我正在引用链接 https://davidwalsh.name/backup-mysql-database-php 备份实时服务器上的数据库。问题是当我打开作为备份获得的文件时,我看到整个数据都以字符串形式转换。所以,假设我在日期字段中有 null,它被转换为使日期为 0000-00-00,位值 0 转换为 1。

我使用了 mysqldump,它也有问题,我把它放在其他问题上: mysqldump working on local but not on godaddy server

我使用的函数如下:

function Export_Database($host,$user,$pass,$name,  $tables, $backup_name=false )
{
$mysqli = new mysqli($host,$user,$pass,$name);
$mysqli->select_db($name);
$mysqli->query("SET NAMES 'utf8'");
foreach($tables as $table)
{
$result = $mysqli->query('SELECT * FROM '.$table);
$fields_amount = $result->field_count;
$rows_num=$mysqli->affected_rows;
$res = $mysqli->query('SHOW CREATE TABLE '.$table);
$TableMLine = $res->fetch_row();
$content = (!isset($content) ? '' : $content) . "\n\n".$TableMLine[1].";\n\n";

for ($i = 0, $st_counter = 0; $i < $fields_amount; $i++, $st_counter=0)
{
while($row = $result->fetch_row())
{ //when started (and every after 100 command cycle):
if ($st_counter%100 == 0 || $st_counter == 0 )
{
$content .= "\nINSERT INTO ".$table." VALUES";
}
$content .= "\n(";
for($j=0; $j<$fields_amount; $j++)
{
$row[$j] = str_replace("\n","\\n", addslashes($row[$j]) );
if (isset($row[$j]))
{
$content .= '"'.$row[$j].'"' ;
}
else
{
$content .= '""';
}
if ($j<($fields_amount-1))
{
$content.= ',';
}
}
$content .=")";
//every after 100 command cycle [or at last line] ....p.s. but should be inserted 1 cycle eariler
if ( (($st_counter+1)%100==0 && $st_counter!=0) || $st_counter+1==$rows_num)
{
$content .= ";";
}
else
{
$content .= ",";
}
$st_counter=$st_counter+1;
}
} $content .="\n\n\n";
}
$folder = 'DB_Backup/';
if (!is_dir($folder))
mkdir($folder, 0777, true);
chmod($folder, 0777);

$date = date('m-d-Y-H-i-s', time());
$filename = $folder."db-backup-".$date;

$handle = fopen($filename.'.sql','w+');
fwrite($handle,serialize($content));
fclose($handle);
}

最佳答案

I solved using the following way. Here, $tables is and array of tables of your database.I used the link for reference http://php.net/manual/en/mysqli-result.fetch-field-direct.php

function Export_Database($host,$user,$pass,$name,  $tables, $backup_name=false )
{
//value greater than 250 are strings
$mysql_data_type_hash = array(
1=>'tinyint',
2=>'smallint',
3=>'int',
4=>'float',
5=>'double',
7=>'timestamp',
8=>'bigint',
9=>'mediumint',
10=>'date',
11=>'time',
12=>'datetime',
13=>'year',
16=>'bit',
//252 is currently mapped to all text and blob types (MySQL 5.0.51a)
253=>'varchar',
254=>'char',
246=>'decimal'
);


$mysqli = new mysqli($host,$user,$pass,$name);
$mysqli->select_db($name);
$mysqli->query("SET NAMES 'utf8'");
foreach($tables as $table)
{
$result = $mysqli->query('SELECT * FROM '.$table);
$fields_amount = $result->field_count;
$rows_num=$mysqli->affected_rows;
$res = $mysqli->query('SHOW CREATE TABLE '.$table);
$TableMLine = $res->fetch_row();
$content = (!isset($content) ? '' : $content) . "\n\n".$TableMLine[1].";\n\n";

for ($i = 0, $st_counter = 0; $i < $fields_amount; $i++, $st_counter=0)
{
while($row = $result->fetch_row())
{

//when started (and every after 100 command cycle):
if ($st_counter%100 == 0 || $st_counter == 0 )
{
$content .= "\nINSERT INTO ".$table." VALUES";
}
$content .= "\n(";
for($j=0; $j<$fields_amount; $j++)
{
$datatype=$result->fetch_field_direct($j)->type;
//echo $mysql_data_type_hash[$datatype]."<br/>";
$row[$j] = str_replace("\n","\\n", addslashes($row[$j]) );
if (isset($row[$j]) && trim($row[$j])!=null)
{
if(($datatype>=10 && $datatype<=13) || $datatype>250)
{
$content .= '"'.$row[$j].'"' ;
}
else
{
$content .= $row[$j] ;
}
}
else
{
$content .= 'NULL';
}
if ($j<($fields_amount-1))
{
$content.= ',';
}
}
$content .=")";
//every after 100 command cycle [or at last line] ....p.s. but should be inserted 1 cycle eariler
if ( (($st_counter+1)%100==0 && $st_counter!=0) || $st_counter+1==$rows_num)
{
$content .= ";";
}
else
{
$content .= ",";
}
$st_counter=$st_counter+1;
}
} $content .="\n\n\n";
}

$folder = 'DB_Backup/';
if (!is_dir($folder))
mkdir($folder, 0777, true);
chmod($folder, 0777);

$date = date('m-d-Y-H-i-s', time());
$filename = $folder."db-backup-".$date;

//Commenting The Warning Given By Mysql When Taking Database Backup
$content=str_replace("Warning","-- Warning",$content);

$handle = fopen($filename.'.sql','w+');
fwrite($handle,$content);
fclose($handle);
}

关于php - Mysql数据备份转换成字符串,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38827365/

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