使用IEnumerable接口遍历数据,这在项目中会经常的用到,这个类型呢主要是一个枚举器. 1.首先需要让该类型实现一个名字叫IEnumerable的接口,实现该接口的主要目的是为了让当前类型中增加一个名字叫GetEnumerator()的方法. public class Person : IEnumerable { private string[] Friends = new string[] { "张三", "李四", "王五", &quo…
方法一:使用游标(此方法适用所有情况,对标结构没有特殊要求.) declare @ProductName nvarchar() declare pcurr cursor for select ProductName from Products open pcurr fetch next from pcurr into @ProductName ) begin print (@ProductName) fetch next from pcurr into @ProductName end clos…
--------------------------------------例子1 单纯的游标-------------------------------- create TABLE Table1 ( a ), b ), c ), CONSTRAINT [PK_Table1] PRIMARY KEY CLUSTERED ( a ASC ) ) ON [PRIMARY] create TABLE Table2 ( a ), c ), CONSTRAINT [PK_Table2] PRIMARY…
背景 在读取大约200W左右的数据的时候采用游标形式进行数据遍历时,超过10分钟就报错 timeout 原因 pymongo游标会在10分钟之后被关闭 解决方案 db.find({}, no_cursor_timeout=True) 官方文档说明 returned cursor is closed by the server after 10 minutes of inactivity. If set to True, the returned cursor will never time ou…
DECLARE @资产编号 VARCHAR(50) ,@gsid VARCHAR(50) DECLARE test_Cursor CURSOR LOCAL FOR SELECT 资产编号,gsid FROM zctemp OPEN test_Cursor WHILE @@FETCH_STATUS = 0 BEGIN FETCH NEXT FROM test_Cursor INTO @资产编号,@gsid PRINT '--------------------------'+@资产编号 END C…
public static void fun1(){ Properties v = new Properties(); v.setProperty("a","1"); v.setProperty("a1","11"); v.setProperty("a2","111"); System.out.println(v); // 获取键值 String s = v.getProperty(&q…