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mysql blob大小配置介绍 - 爬虫/数据库 - 清泛IT社区,为创新赋能!

...理器(如数据库管理器)不去理会文件是什么,而是关心如何去处理它。但也有专家强调,这种处理大数据对象的方法是把双刃剑,它有可能引发一些问题,如存储的二进制文件过大,会使数据库的性能下降。在数据库中存放体...
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App Inventor 2 低功耗蓝牙(BLE) 硬件接入、数据通信及IO控制 · App Inventor 2 中文网

...本文主要介绍一款较为通用、价格低廉的BLE设备从零开始如何利用App Inventor 2开发一款自己专属的手机蓝牙App应用。 BLE与经典蓝牙的区别可参考:《低功耗蓝牙(BLE) 和 经典蓝牙(SPP) 的区别》。 本文主要通过一款常见的BLE硬件...
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Create new user in MySQL and give it full access to one database

I want to create a new user in MySQL and give it full access only to one database, say dbTest , that I create with a command like create database dbTest; . What would be the MySQL commands to do that? ...
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Can't connect to local MySQL server through socket '/var/mysql/mysql.sock' (38)

I am having a big problem trying to connect to mysql. When I run: 41 Answers 41 ...
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MySQL show status - active or total connections?

... Connections The number of connection attempts (successful or not) to the MySQL server. You can see the number of active connections either through the Threads_connected status variable: Threads_connected The number of currently open connections. mysql> show status where `variable_name` = 'Th...
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App Inventor 2 多用户预订系统如何设计? - App Inventor 2 中文网 - 清泛...

问:我遇到了一个难题,我开发了一个软件,两个手机都安装了同一个软件,我在一个手机上显示按钮已经不能启用,但在另一个手机上该按钮确还能用,我的目标是这个跟酒店房间一样,当某个房间有人订了,其他人就不能订...
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PDOException SQLSTATE[HY000] [2002] No such file or directory

... The error message indicates that a MySQL connection via socket is tried (which is not supported). In the context of Laravel (artisan), you probably want to use a different / the correct environment. Eg: php artisan migrate --env=production (or whatever enviro...
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MongoDB与内存 - 大数据 & AI - 清泛网 - 专注IT技能提升

...于它对内存的贪得无厌,至于个中缘由,我先讲讲Linux是如何管理内存的,再说说MongoDB是如何使用内存的...但凡初次接触MongoDB的人,无不惊讶于它对内存的贪得无厌,至于个中缘由,我先讲讲Linux是如何管理内存的,再说说MongoD...
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MongoDB与内存 - 大数据 & AI - 清泛网 - 专注IT技能提升

...于它对内存的贪得无厌,至于个中缘由,我先讲讲Linux是如何管理内存的,再说说MongoDB是如何使用内存的...但凡初次接触MongoDB的人,无不惊讶于它对内存的贪得无厌,至于个中缘由,我先讲讲Linux是如何管理内存的,再说说MongoD...
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MongoDB与内存 - 大数据 & AI - 清泛网 - 专注IT技能提升

...于它对内存的贪得无厌,至于个中缘由,我先讲讲Linux是如何管理内存的,再说说MongoDB是如何使用内存的...但凡初次接触MongoDB的人,无不惊讶于它对内存的贪得无厌,至于个中缘由,我先讲讲Linux是如何管理内存的,再说说MongoD...