Mysql访问 for橙子小海

package com.mvc.model.dao;

import com.mvc.model.daoutil.DBConn;
import com.mvc.model.entity.Blog;

这是连接的代码：
package com.mvc.model.daoutil ;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.naming.NamingException;

public class DBConn {
   private Connection con = null;
   private Statement stmt = null;
   public ResultSet rst = null;
   public PreparedStatement pstmt = null;

   public Connection getConnection() throws SQLException, NamingException
    {
      try
      {
         String Driver = "com.mysql.jdbc.Driver";
         String URL = "jdbc:mysql://localhost:3306/blogsql";
         String Username = "root";
         String Password = "root";
         Class.forName(Driver);
         con = DriverManager.getConnection(URL, Username, Password);
      }
      catch (Exception e)
      {
         System.out.println("This is error message from getConnection() ===" + e);
      }
      return con;
    }

   public DBConn(boolean b)
   {

   }

   public DBConn()    //���캯��
   {
      try {
         con = getConnection();
　　　　　 if (con != null)
             stmt = con.createStatement();
      } catch (Exception e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
      }
   }

   public void excuteQuery(String s)
   {
      try {
         if(stmt != null)
         {
            rst = stmt.executeQuery(s);
         }
      } catch (SQLException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
      }
   }

   public int excuteUpdate(String s)
   {
      int status = 0;

      try{
         if(stmt != null)
            status = stmt.executeUpdate(s);
      }
      catch(Exception e){
         e.printStackTrace();
      }

      return status;
   }

   //============================================
   public boolean next()      {
      try{
         return rst==null ? null : rst.next();
      }
      catch(Exception e){
         e.printStackTrace();
         return false;
      }
   }

   //�ͷ��ڴ�
   public void close()
   {
      try{
         if(rst != null) rst.close();
         if(stmt != null) stmt.close();
         if(con != null) con.close();
      }
      catch(Exception e){
         e.printStackTrace();
      }
   }

   public static void main(String [] args)
   {
      DBConn sdb = new DBConn();
      try {
         System.out.println(sdb.getConnection());
      } catch (SQLException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
      } catch (NamingException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
      }
   }
}

下面是添加的函数：
public class AddWeiboDao {
    //�����Լ������΢��
    public boolean AddDao(Blog b) {
        String strSQL ="insert into news(Blog_id,Blog_context,Blog_time) "
            +"values('"+b.getId()+"','"+b.getContext().trim()+"','"+b.getTime()+"')";
        //������ݿ�����

        try{
          DBConn dbConn = new DBConn();
          dbConn.excuteUpdate(strSQL);
          dbConn.close();
         return true;
      }
      catch(Exception e){
         e.printStackTrace();
         return false;
      }
    }

}