Regelmæssig database backup er meget vigtig opgave for udviklere. Det forhindrer risiko for at miste data, som om der opstår et problem på serveren som hacking eller servernedbrud. Så du skal indstille planlagt databasesikkerhedskopiering for at forhindre fremtidige datatab.
Du kan tage backup af mysql database på mange måder. Du kan logge direkte ind på dit hosting-cpanel og tage fuld backup med kun få klik, men hvis du ikke har adgang til cpanel, kan du oprette et simpelt PHP-script og indstille det til planlagt backup. Så i dette indlæg vil jeg dele følgende nyttige PHP script til at tage MySql database backup/eksport.
Brug følgende PHP-script til at tage backup af Mysql-databasen
<?php
// Pass your database information
$mysqlUserName = "db Username";
$mysqlPassword = "db Password";
$mysqlHostName = "db Hostname";
$DbName = "database name which you want to take backup";
$backup_name = "backup file name"; //optional
$tables = "Your tables"; //optional
//or add 5th parameter(array) of specific tables: array("mytable1","mytable2","mytable3") for multiple tables
exportDB($mysqlHostName,$mysqlUserName,$mysqlPassword,$DbName, $tables=false, $backup_name=false );
function exportDB($host,$user,$pass,$name, $tables=false, $backup_name=false )
{
$mysqli = new mysqli($host,$user,$pass,$name);
$mysqli->select_db($name);
$mysqli->query("SET NAMES 'utf8'");
$queryTables = $mysqli->query('SHOW TABLES');
while($row = $queryTables->fetch_row())
{
$target_tables[] = $row[0];
}
if($tables !== false)
{
$target_tables = array_intersect( $target_tables, $tables);
}
foreach($target_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;
}
} $content .="\n\n\n";
}
//$backup_name = $backup_name ? $backup_name : $name."___(".date('H-i-s')."_".date('d-m-Y').")__rand".rand(1,11111111).".sql";
$backup_name = $backup_name ? $backup_name : $name.".sql";
header('Content-Type: application/octet-stream');
header("Content-Transfer-Encoding: Binary");
header("Content-disposition: attachment; filename=\"".$backup_name."\"");
echo $content; exit;
}
?> |