![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
package com.chinasoft.julong.dao; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; public class BaseDAO { private Connection conn; private ResultSet rst; private PreparedStatement pst; String className="oracle.jdbc.OracleDriver"; String useName="oracle"; String password="oracle"; String url="jdbc:oracle:thin:@127.0.0.1:1521:orcl"; //加载数据库驱动程序 public BaseDAO(){ try { Class.forName(className); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } } //建立数据库连接 public void getConnection(){ try { conn=DriverManager.getConnection(url,useName,password); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } //不带参数的有查询结果集的函数(查询) public ResultSet ExecuteQuery(String sql){ return ExecuteQuery(sql,new Object[]{}); } //带参数的有查询结果集的函数(查询) public ResultSet ExecuteQuery(String sql,Object[] arry){ getConnection(); try { pst=conn.prepareStatement(sql); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } for(int i=0;i<arry.length;i++){ try { pst.setObject(i+1, arry[i]); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } try { rst=pst.executeQuery(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return rst; } //不带参数的更新函数(增加,修改,删除) public int ExecuteUpdate(String sql){ return ExecuteUpdate(sql,new Object[]{}); } //带参数的更新函数(增加,修改,删除) public int ExecuteUpdate(String sql,Object[] arry){ getConnection(); int result=0; try { pst=conn.prepareStatement(sql); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } for(int i=0;i<arry.length;i++){ try { pst.setObject(i+1, arry[i]); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } try { result=pst.executeUpdate(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } Closed(); return result; } //关闭数据库操作对象 public void Closed(){ try { if(rst!=null&&!rst.isClosed()){ rst.close(); } if(!pst.isClosed()){ pst.close(); } if(!conn.isClosed()){ conn.close(); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }