Mercurial > hg > LightPIT / file revision

 /*

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  * Copyright 2018 Mike Becker. All rights reserved.

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  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

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 package de.uapcore.lightpit.dao.postgres;

 import de.uapcore.lightpit.dao.UserDao;

 import de.uapcore.lightpit.entities.User;

 import java.sql.Connection;

 import java.sql.PreparedStatement;

 import java.sql.ResultSet;

 import java.sql.SQLException;

 import java.util.ArrayList;

 import java.util.List;

 import java.util.Objects;

 import java.util.Optional;

 import static de.uapcore.lightpit.dao.Functions.getSafeString;

 import static de.uapcore.lightpit.dao.Functions.setStringOrNull;

 public final class PGUserDao implements UserDao {

     private final PreparedStatement insert, update, list, find, findByUsername;

     public PGUserDao(Connection connection) throws SQLException {

         list = connection.prepareStatement(

                 "select userid, username, lastname, givenname, mail " +

                         "from lpit_user where userid >= 0 " +

                         "order by username");

         find = connection.prepareStatement(

                 "select userid, username, lastname, givenname, mail " +

                         "from lpit_user where userid = ? ");

         findByUsername = connection.prepareStatement(

                 "select userid, username, lastname, givenname, mail " +

                         "from lpit_user where lower(username) = lower(?) ");

         insert = connection.prepareStatement("insert into lpit_user (username, lastname, givenname, mail) values (?, ?, ?, ?)");

         update = connection.prepareStatement("update lpit_user set lastname = ?, givenname = ?, mail = ? where userid = ?");

     }

     static User mapColumns(ResultSet result) throws SQLException {

         final int id = result.getInt("userid");

         if (id == 0) return null;

         final var user = new User(id);

         user.setUsername(result.getString("username"));

         user.setGivenname(getSafeString(result, "givenname"));

         user.setLastname(getSafeString(result, "lastname"));

         user.setMail(getSafeString(result, "mail"));

         return user;

     }

     @Override

     public void save(User instance) throws SQLException {

         Objects.requireNonNull(instance.getUsername());

         insert.setString(1, instance.getUsername());

         setStringOrNull(insert, 2, instance.getLastname());

         setStringOrNull(insert, 3, instance.getGivenname());

         setStringOrNull(insert, 4, instance.getMail());

         insert.executeUpdate();

     }

     @Override

     public boolean update(User instance) throws SQLException {

         if (instance.getId() < 0) return false;

         setStringOrNull(update, 1, instance.getLastname());

         setStringOrNull(update, 2, instance.getGivenname());

         setStringOrNull(update, 3, instance.getMail());

         update.setInt(4, instance.getId());

         return update.executeUpdate() > 0;

     }

     @Override

     public List<User> list() throws SQLException {

         List<User> users = new ArrayList<>();

         try (var result = list.executeQuery()) {

             while (result.next()) {

                 users.add(mapColumns(result));

             }

         }

         return users;

     }

     @Override

     public User find(int id) throws SQLException {

         find.setInt(1, id);

         try (var result = find.executeQuery()) {

             if (result.next()) {

                 return mapColumns(result);

             } else {

                 return null;

             }

         }

     }

     @Override

     public Optional<User> findByUsername(String username) throws SQLException {

         findByUsername.setString(1, username);

         try (var result = findByUsername.executeQuery()) {

             if (result.next()) {

                 return Optional.of(mapColumns(result));

             } else {

                 return Optional.empty();

             }

         }

     }

 }