OwnerJdbcDao.java 7.15 KB
Newer Older
1 2
package at.ac.tuwien.sepm.assignment.individual.persistence.impl;

3
import at.ac.tuwien.sepm.assignment.individual.entity.Horse;
4 5 6
import at.ac.tuwien.sepm.assignment.individual.entity.Owner;
import at.ac.tuwien.sepm.assignment.individual.exception.NotFoundException;
import at.ac.tuwien.sepm.assignment.individual.persistence.OwnerDao;
7

8
import java.lang.invoke.MethodHandles;
9
import java.sql.PreparedStatement;
10 11
import java.sql.ResultSet;
import java.sql.SQLException;
12
import java.time.LocalDateTime;
13
import java.util.ArrayList;
14
import java.util.List;
15 16
import java.util.Map;

17 18 19
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
20 21
import org.springframework.dao.DataAccessException;
import org.springframework.dao.DataIntegrityViolationException;
22 23 24
import org.springframework.dao.EmptyResultDataAccessException;
import org.springframework.dao.IncorrectResultSizeDataAccessException;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
25 26
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
27 28
import org.springframework.jdbc.support.GeneratedKeyHolder;
import org.springframework.jdbc.support.KeyHolder;
29 30 31 32 33 34
import org.springframework.stereotype.Repository;

@Repository
public class OwnerJdbcDao implements OwnerDao {

    private static final String TABLE_NAME = "Owner";
35
    private static final String HORSE_TABLE_NAME = "Horse";
36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56
    private static final Logger LOGGER = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
    private final JdbcTemplate jdbcTemplate;
    private final NamedParameterJdbcTemplate namedParameterJdbcTemplate;

    @Autowired
    public OwnerJdbcDao(JdbcTemplate jdbcTemplate, NamedParameterJdbcTemplate namedParameterJdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
        this.namedParameterJdbcTemplate = namedParameterJdbcTemplate;
    }

    @Override
    public Owner findOneById(Long id) {
        LOGGER.trace("Get owner with id {}", id);
        final String sql = "SELECT * FROM " + TABLE_NAME + " WHERE id=?";
        List<Owner> owners = jdbcTemplate.query(sql, new Object[] { id }, this::mapRow);

        if (owners.isEmpty()) throw new NotFoundException("Could not find owner with id " + id);

        return owners.get(0);
    }

57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95
    @Override
    public Owner addOwner(Owner owner) {
        LOGGER.trace("Add owner {}", owner);
        final String sql = "INSERT INTO " + TABLE_NAME + "(name, created_at, updated_at) VALUES(?,?,?)";

        try {
            // Check if the constraints are violated
            this.validateOwner(owner);

            LocalDateTime currentTime = LocalDateTime.now();

            owner.setCreatedAt(currentTime);
            owner.setUpdatedAt(currentTime);

            // Create a key holder to get the key of the new record
            KeyHolder keyHolder = new GeneratedKeyHolder();

            int changes = jdbcTemplate.update(connection -> {
                PreparedStatement ps = connection.prepareStatement(sql, PreparedStatement.RETURN_GENERATED_KEYS);

                ps.setString(1, owner.getName());
                ps.setObject(2, owner.getCreatedAt());
                ps.setObject(3, owner.getUpdatedAt());
                return ps;
            }, keyHolder);

            if (changes == 0)
                throw new DataAccessException("Creating owner failed, no rows affected") {};

            owner.setId(((Number)keyHolder.getKeys().get("id")).longValue());

            return owner;

        } catch (DataAccessException e) {
            // We are doing this in order to not change the exception type
            throw new DataAccessException("Adding new records failed", e) {};
        }
    }

96 97 98 99 100 101 102
    @Override
    public Owner updateOwner(Owner owner) throws DataAccessException {
        LOGGER.trace("Update owner {}", owner.toString());
        String sql = "UPDATE " + TABLE_NAME + " SET name=?, updated_at=? WHERE id=?";

        try {
            if(owner.getId() == null || owner.getId() == 0)
103
                throw new DataIntegrityViolationException("Owner Id missing or 0");
104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133

            this.validateOwner(owner);

            Owner oldOwner = findOneById(owner.getId());

            LocalDateTime currentTime = LocalDateTime.now();

            owner.setUpdatedAt(currentTime);

            int changes = jdbcTemplate.update(connection -> {
                PreparedStatement ps = connection.prepareStatement(sql);

                ps.setString(1, owner.getName());
                ps.setObject(2, owner.getUpdatedAt());
                ps.setObject(3, owner.getId());
                return ps;
            });

            if (changes == 0)
                throw new DataAccessException("Updating owner failed, no rows affected") {};

            owner.setCreatedAt(oldOwner.getCreatedAt());

            return owner;
        } catch(DataAccessException e) {
            // We are doing this in order to not change the exception type
            throw new DataAccessException("Updating records failed", e) {};
        }
    }

134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158
    @Override
    public void deleteOwner(Long id) throws DataAccessException, NotFoundException {
        Owner ownerToDelete = this.findOneById(id);
        LOGGER.trace("Delete owner with id {}", id);
        final String sql = "DELETE FROM " + TABLE_NAME + " WHERE id=?";

        if (ownerOwnsHorses(id))
            throw new DataIntegrityViolationException("Deleting owner failed, owner has horses assigned");

        try {
            int changes = jdbcTemplate.update(connection -> {
                PreparedStatement ps = connection.prepareStatement(sql);
                ps.setLong(1, id);
                return ps;
            });

            if (changes == 0)
                throw new DataAccessException("Deleting owner failed, no rows affected") {};

        } catch(DataAccessException e){
            // We are doing this in order to not change the exception type
            throw new DataAccessException("Deleting records failed", e) {};
        }
    }

159 160 161 162
    private void validateOwner(Owner owner) throws DataIntegrityViolationException {
        if(owner.getName() == null || owner.getName().isEmpty())
            throw new DataIntegrityViolationException("Required parameters for owner missing");
    }
163

164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179
    private boolean ownerOwnsHorses(Long ownerId) {
        final String sql = "SELECT * FROM " + HORSE_TABLE_NAME + " WHERE owner_id=?";

        try {
            jdbcTemplate.queryForObject(sql, new Object[] {ownerId}, BeanPropertyRowMapper.newInstance(Horse.class));
        } catch(EmptyResultDataAccessException e) {
            // If empty, return false
            return false;
        } catch (IncorrectResultSizeDataAccessException e) {
            // If incorrect size above 0, return true
            return true;
        }

        return true;
    }

180 181 182 183 184 185 186 187 188 189
    private Owner mapRow(ResultSet resultSet, int i) throws SQLException {
        final Owner owner = new Owner();
        owner.setId(resultSet.getLong("id"));
        owner.setName(resultSet.getString("name"));
        owner.setCreatedAt(resultSet.getTimestamp("created_at").toLocalDateTime());
        owner.setUpdatedAt(resultSet.getTimestamp("updated_at").toLocalDateTime());
        return owner;
    }

}