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PHP操作MongoDB时的整数问题及对策 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...需要Map和Reduce两步即可,这里有一个PDF文档生动的说明了MySQL中GROUP BY和MongoDB中MapReduce的对应关系:
SQL to MongoDB
此外,还有很多资料可供参考,如:MongoDB Aggregation III: Map-Reduce Basics。
说明:软件版本为MongoDB 1.6.5,PECL Mongo 1...
在MongoDB中模拟Auto Increment - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
在MongoDB中模拟Auto IncrementMySQL用户多半都有Auto Increment情结,不过MongoDB缺省并没有实现,所以需要模拟一下,编程语言以PHP为例,代码大致如下所示:<?phpfunct...MySQL用户多半都有Auto Increment情结,不过MongoDB缺省并没有实现,所以...
PHP屏蔽警告错误,PHP不输出警告错误 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...方法一、在有可能出错的函数前加@,然后or die("")
如:@mysql_connect(...) or die("Database Connect Error")
屏蔽PHP错误提示方法二、修改php.ini :error_reporting = E_ALL & ~E_NOTICE 或 display_errors = off
屏蔽PHP错误提示方法三、在php脚本前加error_repo...
【解决】linux apache2 php7 不解析php文件的几种可能 - 更多技术 - 清泛网...
...php文件,如果还是不行请尝试:
sudo apt-get install php7.0-mysql
systemctl restart apache2
3、如果还是不行,请检查一下测试用的php文件是否编写正确:
<?php
phpinfo();
?>
----End----linux apache2 php7
Oracle取前N条记录方法 Oracle实现SELECT TOP N的方法 - 爬虫/数据库 - 清...
select * from ( select * from tablexxx order by xxx desc ) where rownum <= N
oracle数据库不支持mysql中limit, top功能,但可以通过rownum来限制返回的结果集的行数,rownum并不是用户添加的字段,而是oracle系统自动添加的。
【解决】linux class mysqli not found - 更多技术 - 清泛网 - 专注C/C++及内核技术
【解决】linux class mysqli not found安装mysqli安装包:apt-get install php-mysqli重启apache2搞定!安装mysqli安装包:
apt-get install php-mysqli
重启apache2搞定!
php,mysql,mysqli
- App Inventor 2 中文网 - 清泛IT社区,为创新赋能!
...ce/components/storage.html#TinyWebDB
包括公众号都已经发过。mysql 通过 web api 封装中间层是没有太大难度的。还有收费第三方数据库的拓展,如 LeanDB 可以了解一下。
Android - Pulling SQlite database android device
...droid v4 or above, you can pull app data, including it's database, without root by using adb backup command, then extract the backup file and access the sqlite database.
First backup app data to your PC via USB cable with the following command, replace app.package.name with the actual package name ...
URL rewriting with PHP
...
The .htaccess route with mod_rewrite
Add a file called .htaccess in your root folder, and add something like this:
RewriteEngine on
RewriteRule ^/?Some-text-goes-here/([0-9]+)$ /picture.php?id=$1
This will tell Apache to enable mod_rewrite for this folder, and if it gets asked a URL matching th...
pip installing in global site-packages instead of virtualenv
...same issue while installing a python package from within a virtualenv.
The root cause in my case was different.
From within the virtualenv, I was (out of habit on Ubuntu), doing:
sudo easy_install -Z <package>
This caused the bin/pip shebang to be ignored and it used the root's non virtuale...