最近做mybatis+oracle项目的时候解决添加一条数据并返回所添加数据的主键问题 controller层 @RequestMapping("/addplan") public @ResponseBody OnlineAddplanWithBLOBs insertOnlineAddplan(OnlineAddplanWithBLOBs plan) throws Exception{ //plan是添加的数据,planid为数据主键,此时对象中主键为null int n = serv…
给文件上传添加进度条,整了两天终于成功了. 想要添加一个上传的进度条,通过分析,应该是需要不断的去访问服务器,询问上传文件的大小.通过已上传文件的大小, 和上传文件的总长度来评估上传的进度. 实现监听器ProgressListener接口,可以实时获取上传文件的长度. public class FileUploadListener implements ProgressListener{ private HttpSession session; public FileUploadListener…
Redundant Paths Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 11047 Accepted: 4725 Description In order to get from one of the F (1 <= F <= 5,000) grazing fields (which are numbered 1..F) to another field, Bessie and the rest of the…
Road Construction Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 13311 Accepted: 6715 Description It's almost summer time, and that means that it's almost summer construction time! This year, the good people who are in charge of the r…
已知一个表 table 里面有两个字段 A1 和 A2 如何用动态语句 判断 A1 = A , A2=B 的数据是否存在,如果不存在,就添加一条数据, A1 = A , A2 = B INSERT table1 (A1,A2)SELECT 'A','B' WHERE NOT EXISTS (SELECT * FROM table1 WHERE A1 = 'A' AND A2 …
demo 的实现图 下边是步骤和代码 1定义 时钟事件,定时的增加进度条的增量. 2: 添加进度条 3;定义字段属性 using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; usin…
类别中包含一个产品的集合属性,如何向数据库添加一条类别记录的同时,添加任意多个产品. public class Product { [DisplayName("产品名称")] public string Name { get; set; } } public class Category { [DisplayName("类别名称")] public string Name { get; set; } private IList<Product> _p…