银行营业网点管理系统——dao包（BaseDao）

package BranchesMgr.dao;
/**
 * 数据库操作类
 * @author Administrator
 *
 */
import java.sql.*;
import java.util.List;
public class BaseDao {
	Connection conn=null;
	PreparedStatement ps=null;
	ResultSet rs=null;
	public void getConnection(){
		try {
			Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		if(conn==null){
			try {
				conn=DriverManager.getConnection("jdbc:sqlserver://127.0.0.1:1433;databasename=CityDB;User=sa;Password=171268");
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
	
	//增删改
	public int excuteUpdate(String sql,List<Object> prams) throws SQLException{
		int rel=0;
		getConnection();
		ps=conn.prepareStatement(sql);
		if(prams!=null){
			for (int i = 0; i < prams.size(); i++) {
				ps.setObject(i+1, prams.get(i));
			}
		}
		 rel=ps.executeUpdate();
		return rel;
	}
	
	//查询
	public ResultSet excuteQurey(String sql,List<Object>prams) throws SQLException{
		getConnection();
		ps=conn.prepareStatement(sql);
		if(prams!=null){
			for (int i = 0; i < prams.size(); i++) {
				ps.setObject(i+1, prams.get(i));
			}
		}
		rs=ps.executeQuery();
		return rs;
	}

	//关闭资源
	public void closeAll(){
		if(rs!=null){
			try {
				rs.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		if(ps!=null){
			try {
				ps.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		if(conn!=null){
			try {
				conn.close();
				conn=null;
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
}