巧用ＪＤＢＣ实现对MySQL的“增删改查”

import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import com.bean.NoticeBean; public class JDBCTest { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Connection conn=null; Statement stmt=null; ResultSet rs=null; try { String driverName="com.mysql.jdbc.Driver"; Class.forName(driverName); String url="jdbc:mysql://localhost:3306/java? useUnicode=true&characterEncoding=gb2312"; conn=DriverManager.getConnection(url,"root","root"); System.out.println("连接MySql成功!!!"); stmt=null; rs=null; String strSql=null; NoticeBean bean=null; String title=null; String content=null; try { title="标题"; content="内容"; strSql="INSERT INTO notice(title,content) VALUES('"+title+"','"+content+"')"; stmt=conn.createStatement(); stmt.executeUpdate(strSql); System.out.println("插入语句执行成功:"+strSql); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); System.out.println("插入失败"); } strSql="select * from notice"; stmt=conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY); rs=stmt.executeQuery(strSql); if(rs.next()){ int id=rs.getInt("id"); title =rs.getString("title"); content=rs.getString("content"); if(rs.next()){ bean=new NoticeBean(id,title,content); } System.out.println("notice第一行数据是"+bean.getId()+" "+bean.getTitle() +" "+bean.getContent()); } try { strSql="delete from notice"; stmt=conn.createStatement(); stmt.executeUpdate(strSql); System.out.println("删除完成"); } catch (RuntimeException e) { // TODO Auto-generated catch block e.printStackTrace(); System.out.println("删除失败"); } } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally{ try { if(rs!=null){ rs.close(); rs=null; } if(stmt!=null){ stmt.close(); stmt=null; } if(conn!=null){ conn.close(); conn=null; } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } }