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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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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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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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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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How to shrink/purge ibdata1 file in MySQL

I am using MySQL in localhost as a "query tool" for performing statistics in R, that is, everytime I run a R script, I create a new database (A), create a new table (B), import the data into B, submit a query to get what I need, and then I drop B and drop A. ...
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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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How can I import a database with MySQL from terminal?

How can I import a database with mysql from terminal? 18 Answers 18 ...
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SQL中使用update inner join和delete inner join;Oracle delete join替代...

...here and table1.khid=table2.khid and FWDWID=8); Oracle的delete与join如何使用 delete from A where sid in (select a.sid from A a inner join B b on a.num2 = b.num1 where b.num2 not between '10'and '10000') 这段sql如何优化,不使用in? 1. 用exists 来替代 in delete fr...
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JAVA敏捷开发环境搭建 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...前面介绍了创业型软件公司的工作模式,这里详细介绍下如何实施,第一步是先要搭建环境,有了环境才能开展工作。整个软件项目分为四个环境 ...前面介绍了创业型软件公司的工作模式,这里详细介绍下如何实施,第一步是...