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CGridCtrl 选中一行 - C/C++ - 清泛网 - 专注C/C++及内核技术

CGridCtrl 选中一行 选中单元格m_Grid.SetItemState(row,col,LVIS_SELECTED|LVIS_FOCUSED); 取消选中单元格m_Grid.SetItemState(row,col,LVIS_OVERLAYMASK);//选中单元格 m_Grid.SetItemState(row, col, LVIS_SELECTED | LVIS_FOCUSED); //取消选中单元格 m_Grid.SetItemState(row, col...
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MongoDB仿关系型数据库Group聚合例子 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术

...系型数据库例子,通过BsonJavaScript脚本实现。相当的SQL:select * from GroupDemo a right join (select userName,max(date) maxdate from GroupDemo group by userName) b on a date=b maxdate namespace MongoGroupDemo { class Program { private static string MongoConnStr...
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领域驱动设计系列(五):事件驱动之异步事件 - 更多技术 - 清泛网 - 专注C/...

... var handlers = _eventHandlerFactory.GetHandlers<T>(); handlers.Select(h => Task.Factory.StartNew(() => HandleEvent<T>(h, @event))); } 这段代码执行完,尽然发现Handler没有执行,好吧,原因是IQueryable的延迟执行,所以我们需要调用一下ToL...
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Linq 多字段排序,二次排序 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...ed = source.OrderByDescending( t => t.f1 ).ThenBy( t => t.f2 );类似SQL:select * from t1 order by f1 d...Linq:ordered = source.OrderByDescending( t => t.f1 ).ThenBy( t => t.f2 ); 类似SQL:select * from t1 order by f1 desc ,f2 asc 这种写法里 OrderBy、ThenBy 是升序的,OrderByD...
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C#泛型(List)中基类和子类 怎么转换? - 更多技术 - 清泛网 - 专注C/C++及内核技术

...函数Foo,Foo支持所有子类列表。 方法一: Foo(childList.Select(p => p as BaseClass).ToList()) 上述 Select 转换是双向的,基类转子类也没问题。 方法二: List<BaseClass> baseList = new List<BaseClass>(); baseList.AddRange(childList); Foo(baseList); ...
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C#泛型(List)中基类和子类 怎么转换? - .NET(C#) - 清泛IT论坛,有思想、有深度

...函数Foo,Foo支持所有子类列表。 方法一: Foo(childList.Select(p =&gt; p as BaseClass).ToList()) 上述 Select 转换是双向的,基类转子类也没问题。 方法二: List&lt;BaseClass&gt; baseList = new List&lt;BaseClass&gt;(); baseList.AddRange(childList); Foo(b...
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App Inventor 2 如何连接MySQL数据库(阿里云数据库) · App Inventor 2 中文网

...接信息 测试代码 注意事项: 返回 HTTP 代码 200 表示SELECT 查询成功 返回 HTTP 代码 201 表示不是有效的 SELECT 查询 返回 HTTP 代码 400,表示 SQL 查询错误 请注意SQL注入风险,加强php代码的检查逻辑 前端代码块 执行sql语...
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Debugging iframes with Chrome developer tools

...ools in Chrome, there is a bar along the top, called the Execution Context Selector (h/t felipe-sabino), just under the Elements, Network, Sources... tabs, that changes depending on the context of the current tab. When in the Console tab there is a dropdown in that bar that allows you to select the...
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JPQL IN clause: Java-Arrays (or Lists, Sets…)?

... for JPA 1.0 but you can pass a Collection in JPA 2.0: String qlString = "select item from Item item where item.name IN :names"; Query q = em.createQuery(qlString, Item.class); List&lt;String&gt; names = Arrays.asList("foo", "bar"); q.setParameter("names", names); List&lt;Item&gt; actual = q.get...
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mysql check collation of a table

...ry INFORMATION_SCHEMA.TABLES and get the collation for a specific table: SELECT TABLE_SCHEMA , TABLE_NAME , TABLE_COLLATION FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = 't_name'; that gives a much more readable output in contrast to SHOW TABLE STATUS that contains a lot of irreleva...