亚洲乱码日产精品一二三,亚洲五月综合网色九月色,日韩欧美亚洲中文乱码

oracle jdbc

�l�茶 — Sun, 13 Apr 2008 10:42:00 GMT

import java.sql.*;

public class DBTest {
   private Statement stmt;
   private Connection conn;
   ResultSet rs;
   int size;

   public void DBTest(){
      stmt=null;
      conn=null;
      rs=null;
      size=0;
   }

   public void openConn() throws SQLException{
      try{
            Class.forName("oracle.jdbc.driver.OracleDriver");
            String url="jdbc:oracle:thin:@127.0.0.1:1521:ORCL";
            String user="dectdb";
            String pwd="dectdb";
            conn=DriverManager.getConnection(url, user, pwd);
      }catch(ClassNotFoundException classNotFoundException){
            System.out.println("No Driver!");
      }
   }

   public ResultSet executeQuery(String sql){
        rs=null;

        try{
           stmt=conn.createStatement();
            rs=stmt.executeQuery(sql);
       }catch(SQLException sqlException){
          System.out.println(sqlException);
      }

      return rs;
}

  public int executeUpdate(String sql){
      stmt=null;
      rs=null;
      size=0;

    try{
            stmt=conn.createStatement();
            size=stmt.executeUpdate(sql);
      }catch(SQLException sqlException){
            System.out.println(sqlException);
      }

      return size;
}

public void closeStmt(){
      try{
      stmt.close();
      }catch(SQLException sqlException){
          System.out.println(sqlException);
      }
}

  public static void main(String[] args){
      DBTest dbTest=new DBTest();
      String sql="select * from dectuser";
     //String sqlUpdate="insert into dectuser(name,sex) values('wang','�?)";

     try{
           dbTest.openConn();
           //int size=dbTest.executeUpdate(sqlUpdate);
           ResultSet rs=dbTest.executeQuery(sql);

          //System.out.println(size);
           while(rs.next()){
                    System.out.println(rs.getString("name"));
           }

          dbTest.closeStmt();
     }catch(SQLException sqlException){
         System.out.println(sqlException);
    }


   }
}

�l�茶 2008-04-13 18:42 发表评论

�l�茶 — Sun, 13 Apr 2008 08:37:00 GMT

下面用一个例子来说明自增主键的创建：

1、徏用户数据�?br />       drop table dectuser;
      create table dectuser(
           userid integer primary key, /*主键�Q�自动增�?/
           name varchar2(20),
          sex varchar2(2)
           );

2、创��动增长序�?br />       drop sequence dectuser_tb_seq;
      create sequence dectuser_tb_seq minvalue 1 maxvalue 99999999
               increment by 1
               start with 1;   /*步长�?*/
3、创��发器
      create or replace trigger dectuser_tb_tri
          before insert on dectuser     /*触发条�g�Q�当向表dectuser执行插入操作时触发此触发�?/
          for each row                       /*�Ҏ��一行都��是否触�?/
          begin                                  /*触发器开�?/
                 select dectuser_tb_seq.nextval into :new.userid from dual;   /*触发器主题内容，卌��发后执行的动作，在此是取得序列dectuser_tb_seq的下一个值插入到表dectuser中的userid字段�?/
          end;

          /                                        /*退出sqlplus行编�?/
4、提�?br />       commit;

      现在��完成了自增主键的设定，搞定�Q�可以检��一下�?br />       insert into dectuser(name,sex) values ('wang','�?);

      提示“已创��Z��?#8221;�Q�表�C�成功。呵呵：D

      要注意的是主键数据类型如果�ؓnumber�Q�则触发器创��Z��了，�q�不明白�q�是��Z��么：�Q?

�l�茶 2008-04-13 16:37 发表评论

Hibernate VS iBATIS

�l�茶 — Wed, 11 Jul 2007 03:11:00 GMT

摘要: 首先�q�个题目有点哗众取宠,呵呵,故意�?参考了�|�上许多前辈的见�?然后加了自己一点点的理�?如果有什么板�?�Ƣ迎来拍
阅读全文

�l�茶 2007-07-11 11:11 发表评论