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
需要向数据库添加100W条测试数据,直接在普通表中添加速度太慢,可以使用内存表添加,然后将内存表数据复制到普通表 创建表 # 内存表 DROP TABLE IF EXISTS `test_memory`; CREATE TABLE `test_page_memory` ( `id` int(11) NOT NULL AUTO_INCREMENT, `username` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFA
