JSP_Prestatement

 

Service

 

package com.service;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.ArrayList;

import com.dao.DAO;
import com.dto.DTO;

public class Service {

	private String driver = "oracle.jdbc.driver.OracleDriver";
    private String url = "jdbc:oracle:thin:@localhost:1521:xe";
    private String user = "scott";
    private String pass = "tiger";
	private DAO dao;

	public Service() {
		dao = new DAO();
		try {
			Class.forName(driver);
			System.out.println("드라이버 로딩 성공");
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
			System.out.println("드라이버 로딩 실패");
		}
	}

	public ArrayList<DTO> selectAll() {
		ArrayList<DTO> list = null;
		Connection con = null;
		try {
			con = DriverManager.getConnection(url, user, pass);
			list = dao.selectAll(con);
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			try {
				if (con != null) {
					con.close();
				}
			} catch (SQLException e) {
				e.printStackTrace();
			} finally {
				return list;
			}
		}
	}
	
}

 

 

 

 

 

DAO

 

package com.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;

import com.dto.DTO;

public class DAO {

	public ArrayList<DTO> selectAll(Connection con) {
		ArrayList<DTO> list = new ArrayList<>();
		PreparedStatement st = null;
		ResultSet  rs = null;
		
		try {
			String sql = "select empno, ename, job, mgr, to_char(hiredate, 'yyyy-mm-dd') hiredate, sal, comm, deptno from emp order by empno";

			st = con.prepareStatement(sql);			
			rs = st.executeQuery();
		
			while (rs.next()) {
				int empno = rs.getInt("empno");
				String ename = rs.getString("ename");
				String job = rs.getString("job");
				int mgr = rs.getInt("mgr");
				String hiredate = rs.getString("hiredate");
				double sal = rs.getDouble("sal");
				double comm = rs.getDouble("comm");
				int deptno = rs.getInt("deptno");
				DTO notice = new DTO(empno, ename, job, mgr, hiredate, sal, comm, deptno);
				list.add(notice);
			}
			
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			try {
				if(st!=null)st.close();
				if(rs!=null)rs.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		return list;
	}
}