java存储过程的创建与调用
create or replace procedure updateProject is
begin
update project p set p.total_intend_gather =
(select sum(ig.gather_sum) from intend_gather ig where ig.project_number=p.project_number);
update project p set p.total_actual_gather =
(select sum(ag.gahter_sum) from actual_gather ag where ag.project_number=p.project_number);
update project p set p.total_invoice=
(select sum(invoice.invoice_sum) from invoice invoice
where invoice.intend_id in
(select ig.intend_id from intend_gather ig where ig.project_number=p.project_number));
end updateProject;
Session session = this.getSession();
Transaction tx =null;
try {
tx = session.beginTransaction();
Connection con = session.connection();
String procedure = "{call updateproject() }";
CallableStatement cstmt = con.prepareCall(procedure);
cstmt.executeUpdate();
tx.commit();
} catch (Exception e) {
tx.rollback();
}
相关文档：
// multi.MultiServer.java
package multi;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
public class MultiServer {
private int port = 8000;
private int backlog = 42;
private ServerSocket server_socket;
private Thread ......
在分布式服务框架中，一个最基础的问题就是远程服务是怎么通讯的，在Java领域中有很多可实现远程通讯的技术，例如：RMI、MINA、ESB、Burlap、Hessian、SOAP、EJB和JMS等，这些名词之间到底是些什么关系呢，它们背后到底是基于什么原理实现的呢，了解这些是实现分布式服务框架的基础知识，而如果在性能上有高的要求的话，那� ......
今天遇到一个很诡异的bug，调试了半天也没有看出来有什么问题，抽象一下代码如下：
public class Instance
{
public static Instance instance = new Instance();
public static Map<String, String> map = new HashMap<String, String>();
public static Instance instance()
{
r ......
System.out.println(2|0); //0010 0000 =>0010 = 2
System.out.println(2|1); //0010 0001 =>0011 = 3
System.out.println(3|2); //0011 0010 =>0011 = 3
System.out.println(3&2); //0011 0010 =>0010 = 2
/*
在java中0代表假, 1代表真
00011|0010 从右到左比较0|1 = 1, 1|0 = ......
jar 应用 先打开命令提示符(win2000或在运行筐里执行cmd命令，win98为DOS提示符)，输入jar
-help,然后回车(如果你盘上已经有了jdk1.1或以上版本)，看到什么：
用法：jar {ctxu}[vfm0Mi] [jar-文件]
[manifest-文件] [-C 目录] 文件名 ...
选项：
-c 创建新的存档
-t 列出存档内容的列表
-x
展开存档中的命名� ......
