本教学将使用纯 php 去备份资料库并下载到目录底下
$ crontab -e
设定每天凌晨00:00 执行
0 0 * * * php /var/www/backup.php
backup.php 脚本记得开头一定要 「<?php」,即便你有启用缩写
header('Content-Type: text/html; charset=utf-8');
function backup_mysql_database($options){
$mtables = array(); $contents = "-- Database: `".$options['db_to_backup']."` --\n";
$mysqli = new mysqli($options['db_host'], $options['db_uname'], $options['db_password'], $options['db_to_backup']);
if ($mysqli->connect_error) {
die('Error : ('. $mysqli->connect_errno .') '. $mysqli->connect_error);
}
$mysqli->query("SET NAMES utf8");
$mysqli->set_charset("utf8mb4");
$results = $mysqli->query("SHOW TABLES");
while ($row = $results->fetch_array()){
if (!in_array($row[0], $options['db_exclude_tables'])){
$mtables[] = $row[0];
}
}
foreach($mtables as $table){
$contents .= "-- Table `".$table."` --\n";
$results = $mysqli->query("SHOW CREATE TABLE ".$table);
while ($row = $results->fetch_array()){
$contents .= $row[1].";\n\n";
}
$results = $mysqli->query("SELECT * FROM ".$table);
$row_count = $results->num_rows;
$fields = $results->fetch_fields();
$fields_count = count($fields);
$insert_head = "INSERT INTO `".$table."` (";
for($i=0; $i < $fields_count; $i++){
$insert_head .= "`".$fields[$i]->name."`";
if($i < $fields_count-1){
$insert_head .= ', ';
}
}
$insert_head .= ")";
$insert_head .= " VALUES\n";
if($row_count>0){
$r = 0;
while ($row = $results->fetch_array()){
if(($r % 400) == 0){
$contents .= $insert_head;
}
$contents .= "(";
for($i=0; $i < $fields_count; $i++){
$row_content = str_replace("\n","\\n",$mysqli->real_escape_string($row[$i]));
switch($fields[$i]->type){
case 8: case 3:
$contents .= $row_content;
break;
default:
$contents .= "'". $row_content ."'";
}
if($i < $fields_count-1){
$contents .= ', ';
}
}
if(($r+1) == $row_count || ($r % 400) == 399){
$contents .= ");\n\n";
} else {
$contents .= "),\n";
}
$r++;
}
}
}
if (!is_dir ( $options['db_backup_path'] )) {
mkdir ( $options['db_backup_path'], 0777, true );
}
## 备份后的 sql 名称
$backup_file_name = "dev-" . date( "Y-m-d H:i:s").".sql";
$fp = fopen($options['db_backup_path'] . '/' . $backup_file_name ,'w+');
if (($result = fwrite($fp, $contents))) {
// echo "Backup file created '$backup_file_name' ($result)";
}
fclose($fp);
return $backup_file_name;
}
## 资料库设定
$options = array(
'db_host'=> 'localhost',
'db_uname' => 'root', // 资料库使用者帐号
'db_password' => 'password', // 资料库密码
'db_to_backup' => 'db', // 资料库名称
'db_backup_path' => '/var/www/', // 保存到哪个路径
'db_exclude_tables' => array()
);
$backup_file_name=backup_mysql_database($options);
这样就可以透过 php 备份到该主机下,直接产生 sql 档了。
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