mysql

How to push MySQL Database Data to a MVC .NET web application

由 早过忘川 提交于 2021-02-08 10:07:52
问题 I would like to know how I can push data changes in a MySQL database table to an MVC Web Application. So if the table changes - the web app gets updated .. I am not talking polling or querying - I am talking MySQL has a table changed - and that table data change gets sent to the Web App - clients. I see that SQL server seems to have some functionality built in (full version but not in express), I am not seeing this in MySQL database either (which is really what I need). 回答1: In SQL Server you

SQLAlchemy can't use func.bigger as func in query

由 空扰寡人 提交于 2021-02-08 10:01:56
问题 To desc my problem. Can see this raw sql: select datediff(now(), create_time) > 7 as is_new from test order by is_new desc limit 19; I try to implement by SQLAlchemy step by step: diff_days = func.datediff(today, test.create_time).label("diff_days") session.query(diff_days).filter(test.id.in_((1,2,3,33344))).order_by(diff_days.asc()).all() This work fine. But when I want to desc > in mysql. It failed: is_new = func.greater(func.datediff(today, test.create_time), 7).label("is_new") session

SQLAlchemy can't use func.bigger as func in query

由 瘦欲@ 提交于 2021-02-08 10:01:53
问题 To desc my problem. Can see this raw sql: select datediff(now(), create_time) > 7 as is_new from test order by is_new desc limit 19; I try to implement by SQLAlchemy step by step: diff_days = func.datediff(today, test.create_time).label("diff_days") session.query(diff_days).filter(test.id.in_((1,2,3,33344))).order_by(diff_days.asc()).all() This work fine. But when I want to desc > in mysql. It failed: is_new = func.greater(func.datediff(today, test.create_time), 7).label("is_new") session

Laravel update/edit using foreach loop

由 妖精的绣舞 提交于 2021-02-08 10:01:48
问题 I was trying to update my table but I couldn't make it work.. I always end up with the error: Invalid argument supplied for foreach() Here is my Controller: public function show_score($id) { $scores = Score::with(['lead','subject'])->where(['subject_id'=>$id])->get(); return view('markbook.show_score',compact('scores')); } public function update_score(Request $request) { $id = $request->input('id'); $scores = Score::find($id); foreach ($scores as $datas) { $datas->jan_ap=$request->input('jan

mysql if() with max()

由 丶灬走出姿态 提交于 2021-02-08 10:00:53
问题 I have a table named attproduct : there are three columns id, attribute, values . I have color and brand for each id in attribute column and corresponding values in value column SELECT id, MAX( IF( attribute = 'brand', value, NULL ) ) AS Brand, MAX( IF( attribute = 'color', value, NULL ) ) AS color FROM fy.attproduct GROUP BY id When I run this query i get output as desired in id, brand, color as columns. I need to know what is role of max in my query, when i remove max, i get null values 回答1

Can't Connect to MySQL Server through Xcode application even tho I am able to connect it via Terminal

由 折月煮酒 提交于 2021-02-08 09:57:50
问题 I'm trying to create an application that fetches data from the MySQL server. I installed MySQL from Homebrew and using the PerfectMySql swift package. I want to test it on my localhost first but I'm unable to connect it from my application . When I mysql -u root -p in the command line, it works as it should. My code for MySQL connection: import PerfectHTTP import PerfectHTTPServer import PerfectMySQL import Foundation public class DB { let host = "localhost" // or "127.0.0.1" let user = "root

Can't Connect to MySQL Server through Xcode application even tho I am able to connect it via Terminal

由 强颜欢笑 提交于 2021-02-08 09:56:47
问题 I'm trying to create an application that fetches data from the MySQL server. I installed MySQL from Homebrew and using the PerfectMySql swift package. I want to test it on my localhost first but I'm unable to connect it from my application . When I mysql -u root -p in the command line, it works as it should. My code for MySQL connection: import PerfectHTTP import PerfectHTTPServer import PerfectMySQL import Foundation public class DB { let host = "localhost" // or "127.0.0.1" let user = "root

Retrieving MySQL data dynamically and plotting on android using retrofit and MPAndroidChart

由 走远了吗. 提交于 2021-02-08 09:53:49
问题 I am following to plot following this example. Things work if I have a static JSON and it will plot the data like shown in the website. However, I am retrieving data from MySQL and they are being updated every hour (I had look into this; create a button and potential to call the URL every hour), but I am not too sure if that's the efficient approach. My question is if I have a MySQL table/data that is being every hour, how do I retrieve them and plot (retain old values as well as plot the new

Retrieving MySQL data dynamically and plotting on android using retrofit and MPAndroidChart

由 落花浮王杯 提交于 2021-02-08 09:53:40
问题 I am following to plot following this example. Things work if I have a static JSON and it will plot the data like shown in the website. However, I am retrieving data from MySQL and they are being updated every hour (I had look into this; create a button and potential to call the URL every hour), but I am not too sure if that's the efficient approach. My question is if I have a MySQL table/data that is being every hour, how do I retrieve them and plot (retain old values as well as plot the new

玩转Linux必备的金钥匙之源码安装mysql依赖程序

由 我的未来我决定 提交于 2021-02-08 09:51:22
安装mysql依赖程序 提示：先保证网络畅通，虚拟机则选择nat模式，不同情况安装的linux系统，需要的依赖包数量版本不一样，最小安装的依赖包就需要多装一些，您的系统版本老可能依赖包版本也不能过高，否则不兼容。 cmake 提示：这些依赖包，也有自己需要的依赖包，先安装它所需依赖包再安装cmake，顺序不能变，否则会缓存错误信息即便清除缓存正确安装也无法解决, cmake包可以下载好挂载，也可以执行此命令在线下载wget https://dl.bintray.com/boostorg/release/1.64.0/source/boost_1_64_0.tar.gz 1、 安装或升级依赖包 用yum联网自动安装依赖包：yum -y install gcc gcc-c++ make libtool zlib zlib-devel pcre pcre-devel openssl openssl-devel 2、 解压、 bootstrap编译 3、 编译并安装 以上步骤不报错，下面很容易执行：gmake && gmake install 和女朋友出去逛逛街再回来，这个操作需要30分钟。查看版本即可。 安装boost 提示：也是要先安装它所需要的依赖包（奇妙吧，依赖包也有依赖包要预先安装） 1、解压 tar zxf /mnt/boost_1_59_0.tar.gz -C /usr
订阅 mysql