第七周JSP增删改查

package ak74;

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

import com.mysql.jdbc.Driver;

public class JDBCUtils {
     //创建工具类   方便使用
	//获取连接
	 public static Connection getCon() throws Exception{
		 
		  Class.forName( "com.mysql.jdbc.Driver");
		  
		Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/mysql?useSSL=false", "root", "guoshaofeng");
		return con;
	 }
	 
	//关闭数据流
	 public static void  realse(ResultSet rst,Statement st,Connection con){
		 if(rst!=null){
				try {
					rst.close();
				} catch (SQLException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				}
				if(st!=null){
				try {
					st.close();
				} catch (SQLException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				}
				if(con!=null){
				try {
					con.close();
				} catch (SQLException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				}
	 }
	 
	 
}

package ak74;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;



public class HaoshuDao {

	private List list;





	/**
	 * @param args
	 */
	//增加
   public boolean insert(Haoshu haoshu){
	    Statement st=null;
	    Connection con=null;
	   
	   try{
		   con=JDBCUtils.getCon();
		   
		   st=con.createStatement();
		   
		   String sql="insert into  haoshu "+"values(‘"
		   +haoshu.getId()+"‘,‘"
		   +haoshu.getName()+"‘,‘"
		   +haoshu.getMvp()+"‘,‘"
		   +haoshu.getChenghao()+"‘"
		   +")";
		 
		   int row=st.executeUpdate(sql);
		   if(row==1){
			   return true;
		   }
				   
	     
		   
	   }catch(Exception e){
		   throw new RuntimeException(e);
	   }
	   
	   finally{
		   JDBCUtils.realse(null, st, con);
	   }
	   
	   
	   
	
	return false;
   }
   
   
   
   
   
 //查询所有

   
   public List FindAllHaoshu(){
	     Connection con=null;
	     Statement st=null;
	     ResultSet rst=null;
	   try{
		con= JDBCUtils.getCon();
		
		st=con.createStatement();
		
		String sql="select*from haoshu;";
		
		rst=st.executeQuery(sql);
		
		List list=new ArrayList();
		   while(rst.next()){
			   Haoshu  haoshu=new Haoshu();
			   haoshu.setId(rst.getInt("id"));
			   haoshu.setName(rst.getString("name"));
			   haoshu.setMvp(rst.getString("mvp"));
			   haoshu.setChenghao(rst.getString("chenghao"));
			    list.add(haoshu);
		   }
		   return list;
	   }catch(Exception e){
		   throw new RuntimeException(e);  
	   }
	   finally{
		   JDBCUtils.realse(rst, st, con);
	   }
	   

   }
   
   
   
   //根据ID来查询记录
   public Haoshu FindHaoshuByid(int id){
	     Connection con=null;
	    PreparedStatement st=null;
	     ResultSet rst=null;
	   try{
		con= JDBCUtils.getCon();
		
		
		String sql="select*from haoshu where id=?;";
		st=con.prepareStatement(sql);
		
            st.setInt(1, id);
		
		rst=st.executeQuery();
		

		 if(rst.next()){
			   Haoshu  haoshu=new Haoshu();
			   haoshu.setId(rst.getInt("id"));
			   haoshu.setName(rst.getString("name"));
			   haoshu.setMvp(rst.getString("mvp"));
			   haoshu.setChenghao(rst.getString("chenghao"));
			 
			    return haoshu;
		   }
		   
	   }catch(Exception e){
		   throw new RuntimeException(e);  
	   }
	   finally{
		   JDBCUtils.realse(rst, st, con);
	   }
	   
            return null;
 }
   
   
   //根据id修改name和mvp
   public boolean Update(Haoshu haoshu){
	    PreparedStatement st=null;
	    Connection con=null;
	   
	   try{
		   con=JDBCUtils.getCon();
		   String sql="update haoshu set name=?,mvp=? where id=?";
		   st=con.prepareStatement(sql);
		   

	       st.setString(1, haoshu.getName());
	       st.setString(2, haoshu.getMvp());
	       st.setInt(3, haoshu.getId());
		   int row=st.executeUpdate();
		   if(row==1){
			   return true;
		   }
				   
	     
		   
	   }catch(Exception e){
		   throw new RuntimeException(e);
	   }
	   
	   finally{
		   JDBCUtils.realse(null, st, con);
	   }
	   
	   
	   
	
	return false;
  }
  
  //根据id删除  
  public boolean Delete(int id){
	  PreparedStatement st=null;
	    Connection con=null;
	   
	   try{
		   con=JDBCUtils.getCon();
		   String sql="delete from haoshu where id=?";
		   st=con.prepareStatement(sql);
		   

	       st.setInt(1, id);
	 
		   int row=st.executeUpdate();
		   if(row==1){
			   return true;
		   }
				   
	     
		   
	   }catch(Exception e){
		   throw new RuntimeException(e);
	   }
	   
	   finally{
		   JDBCUtils.realse(null, st, con);
	   }
	   
	   
	   
	
	return false;
	  
  }
  
}



 

package ak74;

public class JdbcInsertText {

	/**
	 * @param args
	 */
     
	public static void main(String[] args) {
		// TODO Auto-generated method stub
          HaoshuDao  dao=new HaoshuDao();
          Haoshu haoshu=new Haoshu();
          haoshu.setId(6);
          haoshu.setName("兰亭集序");
          haoshu.setMvp("王小姐");
          haoshu.setChenghao("GXJ");
          dao.insert(haoshu) ;
	}

}

package ak74;

public class FindHaoshuByid {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
           HaoshuDao  dao=new HaoshuDao();
           Haoshu h= dao.FindHaoshuByid(6);
           System.out.println(h.getName());
	}

}

package ak74;

public class Update {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
         HaoshuDao  dao=new HaoshuDao();
         
          Haoshu hh=new Haoshu();
          hh.setId(6);
          hh.setName("徐凤年");
          hh.setMvp("bl");
          boolean b=dao.Update(hh);
          System.out.println(b);
	}

}

package ak74;

public class Delete {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
      HaoshuDao  dao=new HaoshuDao();
      boolean bb=dao.Delete(2);
      System.out.println(bb);
	}

}