This article will share with you how to implement mysql database volume backup in PHP, select tables for backup, and implement single sql file and volume sql import. Friends in need can refer to the
volume export idea: count the length of sql statement variables, compare 1 character as 1 byte, if it is greater than the set volume size, write a sql file (I don’t know if this statistics is reliable. This is also a reference to other people).
The idea of importing into volumes: read the sql file line by line, save each line as a complete sql statement to the array, and then loop and execute it to insert into the database. However, the create table statement is divided into multiple lines. This It needs to be dealt with separately (it took me a long time to do this);
<?php //宋正河 转载请注明出处 set_time_limit(0); header('content-type:text/html;charset=utf-8'); mysql_connect('localhost','root','root'); mysql_select_db('test'); $table_array=get_tables('test'); mysql_query('set names utf8'); $filesize=1024*1024*4; $start=$_GET['start']?$_GET['start']:0; $part=$_GET['part']?$_GET['part']:'1'; $table_index=$_GET['table_index']?$_GET['table_index']:'0'; $table=$table_array[$table_index]; $num=200000000;//这个数要足够大,可以是总记录数 $backupdata=''; if($start=='0'){ $query="SHOW CREATE TABLE `{$table}`"; $result = mysql_query($query); $row = mysql_fetch_row($result); $backupdata .= "DROP TABLE IF EXISTS `{$table}`;\n" . $row[1] . ";\n\n"; } $limit=($start=='0')?'':" limit $start,$num "; $query="select * from `{$table}` $limit "; $result=mysql_query($query); $numfields = mysql_num_fields($result); //统计字段数 while($row=mysql_fetch_row($result)){ $comma = ''; //存储逗号 $backupdata_tmp = "INSERT INTO `{$table}` VALUES ("; for($i=0; $i<$numfields; $i++){ $backupdata_tmp .= $comma . "'" . mysql_escape_string($row[$i]) . "'"; $comma = ','; } $backupdata_tmp .= ");\n"; if(strlen($backupdata)+strlen($backupdata_tmp) > $filesize){ //写入文件并跳转 $file='data/'.$table.'-'.$part.'.sql'; file_put_contents($file,$backupdata); echo $file.' 备份完成,程序继续进行!'; $part++; //分段 //表名 //起点 //跳转 sleep(3); echo "<script>location.href='?start={$start}&table_index={$table_index}&part={$part}';</script>"; exit; } $backupdata.=$backupdata_tmp; $start++; } if($backupdata){ $file='data/'.$table.'-'.$part.'.sql'; file_put_contents($file,$backupdata); } echo $table.'备份完成!<br />'; sleep(2); $table_index++; if($table_array[$table_index]){ echo "<script>location.href='?table_index={$table_index}';</script>"; exit; }else{ echo '恭喜你,数据库备份完毕!'; } function get_tables($db){ $tq = mysql_list_tables($db); while($tr = mysql_fetch_row($tq)){ $arrtb[] = $tr[0]; } return $arrtb; } ?>
Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.
Related recommendations:
PHP’s four basic sorting algorithms and two search algorithms
PHP generates and downloads csv files and solves problems
How PHP accepts files and gets the suffix name
The above is the detailed content of PHP implements volume backup of mysql database. For more information, please follow other related articles on the PHP Chinese website!

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

Dreamweaver Mac version
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

WebStorm Mac version
Useful JavaScript development tools