Class UserDao

ch3/UserDao.java:12–159

import java.util.Date;

public class UserDao {
    @Autowired
    DataSource ds;
    final int FAIL = 0;

    public int deleteUser(String id) {
        int rowCnt = FAIL; //  insert, delete, update

        Connection conn = null;
        PreparedStatement pstmt = null;

        String sql = "delete from user_info where id= ? ";

        try {
            conn = ds.getConnection();
            pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, id);
//        int rowCnt = pstmt.executeUpdate(); //  insert, delete, update
//        return rowCnt;
            return pstmt.executeUpdate(); //  insert, delete, update
        } catch (SQLException e) {
            e.printStackTrace();
            return FAIL;
        } finally {
            // close()를 호출하다가 예외가 발생할 수 있으므로, try-catch로 감싸야함.
//            try { if(pstmt!=null) pstmt.close(); } catch (SQLException e) { e.printStackTrace();}
//            try { if(conn!=null)  conn.close();  } catch (SQLException e) { e.printStackTrace();}
            close(pstmt, conn); //     private void close(AutoCloseable... acs) {
        }
    }

    public User selectUser(String id) throws Exception {
        User user = null;

        Connection conn = null;
        PreparedStatement pstmt = null;
        ResultSet rs = null;

        String sql = "select * from user_info where id= ? ";

        try {
            conn = ds.getConnection();
            pstmt = conn.prepareStatement(sql); // SQL Injection공격, 성능향상
            pstmt.setString(1, id);

            rs = pstmt.executeQuery(); //  select

            if (rs.next()) {
                user = new User();
                user.setId(rs.getString(1));
                user.setPwd(rs.getString(2));
                user.setName(rs.getString(3));
                user.setEmail(rs.getString(4));
                user.setBirth(new Date(rs.getDate(5).getTime()));
                user.setSns(rs.getString(6));
                user.setReg_date(new Date(rs.getTimestamp(7).getTime()));
            }
        } catch (SQLException e) {