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一、从头搭建IDEA开发环境https://mp.weixin.qq.com/s/6jXHzkU8JfubhDsQJbwl8Q(https://www.oschina.net/action/GoToLink?urlhttps%3A%2F%2Fmp.weixin.qq.com%2Fs%2F6jXHzkU8JfubhDsQJbwl8Q)1下

WhatisQ&A?Sometimesthefastestwaytogetananswerfromyourdataistoaskaquestionusingnaturallanguage.Forexample,"whatweretotalsaleslastyear."Us

//MainWindow.hclassMainWindow:publicQMainWindow{Q_OBJECTpublic:explicitMainWindow(QWidgetparent0);~MainWin

classSS:publicQObject{Q_OBJECTpublic:staticQStringgetData(QStringip,intport,QStringdata){QTcpSocketm_pSocketnewQTcpSocket();

安装libfastcommon依赖环境官网下载，或者链接：https://pan.baidu.com/s/1jIVjy0Q(https://www.oschina.net/action/GoToLink?urlhttps%3A%2F%2Fpan.baidu.com%2Fs%2F1jIVjy0Q) 密码：jxk

F查询和Q查询F查询在上面所有的例子中，我们构造的过滤器都只是将字段值与某个我们自己设定的常量做比较。如果我们要对两个字段的值做比较，那该怎么做呢？Django提供F()来做这样的比较。F()的实例可以在查询中引用字段，来比较同一个model实例中两个不同字段的值。示例1：查询出卖出数大于库存数的商品