mr.feng

摘要： import java.awt.Color;import java.awt.Graphics;import java.awt.image.BufferedImage;import java.io.IOException;import java.io.OutputStream;import java.util.Random;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.serv 阅读全文

摘要： --自动产生主键值--1 创建一个表create table trigTable(id number primary key,c2 number);/--2 创建一个序列号1create sequence seq_id;/--3 创建triggercreate or replace trigger trpkbefore insert on trigTable for each rowdeclare begin select seq_id.nextval into :new.id from dual;end;/ //创建序列号2create sequence seq_id_jia123minva 阅读全文