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  • The LINQ expression 'Contains([x].ExamId)' could not be translated and will be evaluated locally. 今天看日志的时候,看到一条这样的警告,翻译过来是Linq 表达式无法翻译成sql,将在本地计算,就是因为这个...

    The LINQ expression 'Contains([x].ExamId)' could not be translated and will be evaluated locally.

    今天看日志的时候,看到一条这样的警告,翻译过来是Linq 表达式无法翻译成sql,将在本地计算,就是因为这个Contains方法,没办法解析成sql语句,将会跳过这个条件,将数据拉到内存,然后再执行这个操作。这是个很严重的问题,因为数据量大的话,将会很吃内存,故想办法处理。

    我们一般会在两种情况下用Contains方法,一个是是判断字符串中是否存在某个片段,实现类似LIKE操作,另外就是判断某一个值是否在某个集合中,类似IN操作。

    对字符串操作很简单,EF这个类提供了Contains和Like两个方法,EF在using Microsoft.EntityFrameworkCore;名字空间下,用法如下:

     对于第二种情况,愿意是我直接把查询这个集合的代码写在LINQ里面,像下面这样:

    后来我单独先取出来,然后Tolist(),   在放到这个位置,发现问题竟然解决了,郁闷的是上面的examPage已经被拉到内存中,我只是单独取出来一列。

    下面是解析出来的sql语句 

    展开全文
  • will be initialized after [-Wreorder] 原因 构造函数时,初始化成员变量的顺序要与类声明中的变量顺序相对应,若不对应,则出现如题错误。解决方法就是按照顺序进行初始化。 对这个问题,StackOverflow上也...

    背景

    使用GCC编译代码时遇到以下警告:

    warning "will be initialized after [-Wreorder]

    原因

    构造函数时,初始化成员变量的顺序要与类声明中的变量顺序相对应,若不对应,则出现如题错误。解决方法就是按照顺序进行初始化。

    对这个问题,StackOverflow上也发生了讨论,以下摘录原文:


    https://stackoverflow.com/questions/1564937/gcc-warning-will-be-initialized-after
    Question:

    I am getting a lot of these warnings from 3rd party code that I cannot modify. Is there a way to disable this warning or at least disable it for certain areas (like #pragma push/pop in VC++)?


    展开全文
  • DayDayUp:2019.01.24马云冬季达沃斯论坛(演讲)—Machine will be smarter than human beings, but will never be wiser 目录 马云几点感悟分享 1、马云关于全球化和eWPT的分享 2、马云分享教育的挑战和...

    DayDayUp:2019.01.24马云冬季达沃斯论坛(演讲)—Machine will be smarter than human beings, but will never be wiser

     

     

     

     

    目录

    马云几点感悟分享

    1、马云关于全球化和eWPT的分享

    2、马云分享教育的挑战和机遇

    3、马云分享科技未来的方向

    4、马云的招人心得

    5、马云给年轻人的建议

    马云八大金句


     

     

     

     

     

     

    演讲视频地址马云在瑞士内部视频演讲

    马云几点感悟分享

    1、马云关于全球化和eWPT的分享

            马云认为,今天很多人不喜欢全球化,但是阿里相信全球化。他进一步指出了全球化存在的问题,以及今后需要努力的方向:“大家不喜欢是全球化的普惠性还不够,之前全球化的主导者是大企业,现在我们要融入更多发展中国家、中小企业和年轻人。这也是eWTP要做的。

     

    2、马云分享教育的挑战和机遇

           在马云看来,未来大部分大学和商学院都会面临挑战。中国、印度和非洲的发展中国家往往在高等教育阶段投入了很多,我觉得应该加强前期教育的投入,如幼儿园,中小学。在中国,我们训练我们的小孩要成为机器一样,要会背会算,但这样永远比不过电脑。我们要让下一代做电脑做不了的,要有创意。要塑造文化价值体系,让人们相信自己做的事情有价值,而不是用条条框框来束缚他们。如果只是通过制定规则,那是为不聪明的人做的。未来机器有chip(芯片),人类有heart(心),是未来教育的方向。

     

    3、马云分享科技未来的方向

          作为一家科技公司的创始人和掌权者,马云称自己相信科技的力量,并相信技术对人类有用。他还表示,对科技公司来说不作恶还不够,还要为善,为未来为善。通过科技,人们可以预见并解决问题。现在对阿里巴巴来说,盈利不是最重要的,努力利用科技使世界更加绿色、普惠、可持续,这才是科技的真谛
    PS:博主就是喜欢马云的境界!

     

    4、马云的招人心得

            “我找人的时候,如果觉得这个人五六年后可以当我的老板,我就喜欢。我从来不看大学文凭,这个不太重要,重要的是这个人聪明,积极向上。我发现优秀的人都很积极不抱怨如果一个人整天抱怨,别要他。”
    PS:博主外瑞同意!

     

    5、马云给年轻人的建议

           年轻人代表未来,历来是各大论坛和会议讨论的焦点之一,马云也在会上给出了几点建议:“第一份工作非常重要,不是说要去名企,而是要找到一个好老板能教会你如何正确的做事情,并给自己一个承诺,至少潜下来3年,而不是浅尝辄止,换来换去失败的案例很多。”他还提到,年轻的时候人往往想法很多,但不知道怎么做。他表示,30岁的时候可以试试自己做,40岁的时候专注自己擅长的,50岁的时候帮助年轻人,60岁就可以享受家庭了。

     

     

     

    马云八大金句

    1、吐槽专家:“只有过去的专家,没有未来的专家”
    There is no Expert for future, only expert yesterday.

     

    2、“我就是产品经理,如果我都不会用,不管多先进都不行”
    If I can’t use it, just forget it, no matter how great it is.

     

    3、客户第一,员工第二,股东第三,华尔街不高兴”
    Customer No.1, Employees No.2, Shareholder No.3, The Wall street was not happy.

     

    4、没有女人,就没有阿里巴巴
    Without woman, there will be no Alibaba.
    PS:博主只想说,哈哈

     

    5、手机支付,从第一天开始就是为穷人设计的
    For mobile payment, from the first day, it is designed for poor people.
    PS:博主外瑞同意!

     

    6、谈非洲:我惊呆了,和中国三十年前一样
    I was shocked, and it looks like China 30 years ago.

     

    7、谈教育:机器会比人类更聪明,但不会比人类更智慧。
    Machine will be smarter than human beings, but will never be wiser.
    PS:I think so!
     

    8、 谈电子政务:“花出的每一分钱,你都能看到去哪了”
    Every cent going out, you see where the money goes.

     

     

    参考文章:
    独家|马云瑞士闭门演讲:手机支付就是为穷人设计的(中英对照)
    马云达沃斯论坛讲话:企业家可以改变非洲,世界的犹疑是我的机会

     

     

    展开全文
  • "mysql database connections will be migrated

    千次阅读 2017-10-19 23:39:49
    an information message like this will be shown: {APP_NAME} now works with the connections file used by MySQL Workbench if it is installed. {APP_NAME} will attempt to merge all ...

    My MySQL popup a msg dlg, show the title words, the following is the solution.

    • This answer was given at the MySQL forum:
    
    
    Hi All, I am going to attempt to answer your question.
    
    Some products are able to share connection information to MySQL Server instances with MySQL Workbench. The products that do this are MySQL for Excel, MySQL Notifier and MySQL for Visual Studio.
    
    By sharing connection information this means that if MySQL Workbench is installed in the same computer, all of these programs will attempt to use the same configuration file where MySQL Workbench stores the information about connections.
    
    So, if any of the 3 aforementioned products are installed but MySQL Workbench is not, they will fallback to use their own separate configuration file to store connection information, but as soon as they detect MySQL Workbench is present, they will attempt to migrate or move the connections stored in the separate configuration file to the file MySQL Workbench uses.
    
    The product presents a dialog with the message you have been talking about in this forum thread. You should notice there is a More Info button displayed in that dialog. If you click it an information message like this will be shown:
    
    {APP_NAME} now works with the connections file used by MySQL Workbench if it is installed.
    
    {APP_NAME} will attempt to merge all existing connections with MySQL Workbench and in order to do this MySQL Workbench must not be running.
    
    Please make sure MySQL Workbench is closed to continue with the merging operation. If you choose not to migrate connections now, you will be prompted later to perform the migration.
    
    Also note that in the latest versions of the 3 aforementioned products the migration of connection information can be delayed to be done at a later time or delayed indefinitely, which means the connection information will remain in the product's configuration file until a manual migration of this information is performed.
    
    Best regards.
    
    ====================================
    
    Javier Treviño MySQL on Windows Team
    
    
    展开全文
  • gcc warning "will be initialized after [-Wreorder] 构造函数时,初始化成员变量的顺序要与类声明中的变量顺序相对应,若不对应,则出现如题错误。解决方法就是按照顺序进行初始化。  对这个问题,...
  • 如果碰到如题的提示,可以右键QWidget,选择布局。 添加布局成功后,可以看到LoginUi新增了layout属性
  • 流利说 Level 4 全文

    万次阅读 多人点赞 2019-05-22 10:52:40
    If you get to close to a fire, you will be burned. An earache is a sharp, dull or burning pain in the ear. Common causes of an earache include an infection, a changing air pressure, or water in the ...
  • Carsim安装教程-破解carsim2016.01和Carsim2018

    万次阅读 热门讨论 2019-04-02 23:38:52
    The file will be saved as MSCLIC_SSQ.lic Copy the TASS_License_Server and CarSim2016.1_Prog from Crack folder to installation folder of CarSim / CarSim (like C:\CarSim) As ...
  • 流利说 Level 3 全文

    万次阅读 多人点赞 2019-05-22 10:51:17
    Lemons and great food take a little sour so some people don’t like them. Some sour tasting foods have a lot of vitamin C. These red peppers are very hot and spicy. Eating hot or spicy ...
  • 第五步, fiddler将对称密钥服务器证书公钥加密传递给服务器, 服务器私钥解开后建立信任, 握手完成, 对称密钥加密消息, 开始通信。第六步, fiddler接收到服务器发送的密文, 对称密钥解开, 获得服务器...
  • 【问题】 BirdWatching的iOS app,现在想要去多多折腾,搞懂不同property的setter...所以,专门去把代码改: ? 1 2 3 //@property (nonatomic, weak) UIImagePickerController *imgPickerController; //@property
  • Warning: Function components cannot be given refs. Attempts to access this ref will fail. 问题来源 我们有一个子组件,外部父组件通过 ref 获取子组件的DOM。现在需要给子组件添加翻译(i18N)。 export ...
  • ‘c’ argument looks like a single numeric RGB or RGBA sequence, which should be avoided as value-mapping will have precedence in case its length matches with ‘x’ & ‘y’. Please use a 2-D array...
  • 如上所示,当使用LIKE子句做表复制时,默认会自动拷贝所有字段、字段类型以及它们的NOT-NULL约束,这也就解释了刚才为什么会成功复制NOT-NULL约束。 Default expressions for the copied column definitions ...
  • OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release. 修改jvm.options文件配置,将 -XX:+UseConcMark...
  • I don’t believe that anyone will take up the job of rewriting all the existing C++ code into C# or Java just because it will be easier to work with in future, and because of the garbage collectors, ...
  • 逻辑英语语法笔记

    万次阅读 多人点赞 2019-04-02 21:32:03
    逻辑英语语法笔记 该笔记是笔者学习钟平老师的逻辑英语英语语法的笔记,主要目的总结和复习,如需要更深入学习请到网易有道...复杂定语内部按修饰顺序排序:修饰顺序通常倒序(并列不变序),短语包括介词短语...
  • leaves will still be computed, and will be accumulated into their ``.grad`` attribute. Arguments: outputs (sequence of Tensor): outputs of the differentiated function. inputs (sequence of ...
  • kubectl and minikube configuration will be stored in /root ! To use kubectl or minikube commands as your own user, you may ! need to relocate them. For example, to overwrite your own settings: ...
  • Would it be all right? 这样可以吗?用法透视这是又一个提出建议、请求、劝告的委婉说法。”it”是形式主语,具体的内容在后面。支持范例 Would it be all right to tell him of your arrival? 告诉他你来了行吗?...
  • 下面解释为什么 完善一点的操作 现在在本机上登陆是没有问题的,但是如果在其他主机上连接过来,会发现连不上 Host xxxx is not allowed to connect to this MySql server 这个可以往上看看user那个表,host...
  • 场景 . 安装webpack的时候 遇到的情况; 直接按照提示安装 提示... One CLI for webpack must be installed. These are recommended choices, delivered as separate packages: - webpack-cli (https://github...
  • Will Intel be forced to remove the "cripple AMD" function from their compiler? Many software programmers consider Intel's compiler the best optimizing compiler on the market, and it is often the ...
  • Ubuntu 16.04 虚拟机安装 VMware Tools

    千次阅读 2018-10-29 21:31:15
    falling back to defaults The module vmci has already been installed on this system by another installer or package and will not be modified by this installer. The module vsock has already been ...
  • us that repeated calls with the same module reference will act like a reload. And so here is the smoking gun. Completely outside of the product, I created a little module, a.py, containing an ...
  • 问题描述:如果一个 View 绘制于某个 ... 因此我们想在 View 中直接 Activity 方法时 (最常用的应该就是 Activity.startActivity() 方法了), 不必再向 View 中传递 Activity 对象. 一般在 View 中获取这个 Activi
  • 昨天生产环境有用户反馈...This page can't be displayed. Contact support for additional information. The incident ID is: 5906352683740581956.    这个消息以前从来没见过,看上去也不像是由于JS报错引...
  • xcode升级到4.4.1后 Suppress warning “Category is implementing a method which will also be implemented by its primary class” 2012-08-28 阅读(57) 评论(0) xcode升级到4.4.1 如果一个对一...
  • columns : Index or array-like Column labels to use for resulting frame. Will default to np.arange(n) if no column labels are provided 如果你的数据只有一列,对于column,需要加个中括号 df = pd.DataFr...

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