透过 Crontab 排程备份 Mariadb （Mysql）使用 php

摘要：本教学使用环境介绍伺服器端资料库语言版本本机端本教学将使用纯去备份资料库并下载到目录底下设定每天凌晨执行脚本记得开头一定要，即便你有启用缩写备份后的名称资料库设定资料库使用者帐

本教学使用环境介绍
伺服器端：Ubuntu 18.04 LTS
资料库：Mariadb 10.1.34（Mysql）
语言版本：php 7.3
本机端：MacOS High Sierra

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 「

header("Content-Type: text/html; charset=utf-8");
function backup_mysql_database($options){
$mtables = array(); $contents = "-- Database: `".$options["db_to_backup"]."` --
";

$mysqli = new mysqli($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."` --
";

    $results = $mysqli->query("SHOW CREATE TABLE ".$table);
    while ($row = $results->fetch_array()){
        $contents .= $row[1].";

";
    }

    $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
";

    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++){
                $row_content = str_replace("
","
",$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 .= ");

";
             } else {
                $contents .= "),
";
            }
            $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。

Line ID：ianmac
QQ：1258554508