dao.java

该项目是我近期上传的网上商城项目的核心代码

package dao;

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 java.util.ArrayList;
import javaBean.MyBean;


public class DAO {
	Connection conn = null;

	Statement st = null;

	ResultSet rs = null;

	PreparedStatement pst = null;

	String url = "jdbc:microsoft:sqlserver://127.0.0.1:1433;DatabaseName=db_shop";

	public DAO() {
		try {
			Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public ArrayList<MyBean> ListAllInformation(String sql) {
		ArrayList<MyBean> arrayList = new ArrayList<MyBean>();
		try {
			conn = DriverManager.getConnection(url, "sa", "sa");
			st = conn.createStatement();
			rs = st.executeQuery(sql);

			while (rs.next()) {
				MyBean myBean = new MyBean();
				myBean.setId(rs.getString("id"));
				myBean.setSp_Name(rs.getString("sp_Name"));
				myBean.setSp_Price(rs.getString("sp_Price"));
				myBean.setSp_Info(rs.getString("sp_Info"));
				myBean.setSp_Pic(rs.getString("sp_Pic"));
				arrayList.add(myBean);
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally {
			try {
				if (rs != null) {
					rs.close();
				}
				if (st != null) {
					st.close();
				}
				if (conn != null) {
					conn.close();
				}
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}

		return arrayList;
	}

	public int del(String sql) {  //更新删除都可以用这个
		int n = 0;
		try {
			conn = DriverManager.getConnection(url, "sa", "sa");
			st = conn.createStatement();
			n = st.executeUpdate(sql);
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally {
			try {
				if (rs != null) {
					rs.close();
				}
				if (st != null) {
					st.close();
				}
				if (conn != null) {
					conn.close();
				}
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		return n;
	}

	public int AddPerson(String sql, String userName, String passWord) {
		int n = 0;
		try {
			conn = DriverManager.getConnection(url, "sa", "sa");
			pst = conn.prepareStatement(sql);
			//RegisterBean register = new RegisterBean();
			pst.setString(1, userName);
			pst.setString(2, passWord);
			n = pst.executeUpdate();

		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally {
			try {
				if (st != null) {
					st.close();
				}
				if (conn != null) {
					conn.close();
				}
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		return n;
	}

//	public MyBean Modinfo(int userID) {
//		MyBean myBean = new MyBean();
//		String sql = "select * from login where userID=?";
//		try {
//			conn = DriverManager.getConnection(url, "sa", "sa");
//			pst = conn.prepareStatement(sql);
//			pst.setInt(1, userID);
//			rs = pst.executeQuery();
//			while(rs.next()){
//				myBean.setUserID(rs.getInt("userID"));
//				myBean.setPassWord(rs.getString("passWord"));
//				myBean.setUserName(rs.getString("userName"));
//			}
//		} catch (SQLException e) {
//			// TODO Auto-generated catch block
//			e.printStackTrace();
//		} finally {
//			try {
//				if (rs != null) {
//					rs.close();
//				}
//				if (st != null) {
//					st.close();
//				}
//				if (conn != null) {
//					conn.close();
//				}
//			} catch (SQLException e) {
//				// TODO Auto-generated catch block
//				e.printStackTrace();
//			}
//		}
//		return myBean;
//	}
}