Add PetsDao and Pet Entity

src/main/java/es/uvigo/esei/daa/dao/PetsDAO.java

+package es.uvigo.esei.daa.dao;
+
+import java.util.logging.Logger;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.logging.Level;
+
+import es.uvigo.esei.daa.entities.Pet;
+
+public class PetsDAO extends DAO {
+    private final static Logger LOG = Logger.getLogger(PetsDAO.class.getName());
+
+
+    public Pet get(int id)
+            throws DAOException, IllegalArgumentException {
+        try (final Connection conn = this.getConnection()) {
+            final String query = "SELECT * FROM pets WHERE id=?";
+
+            try (final PreparedStatement statement = conn.prepareStatement(query)) {
+                statement.setInt(1, id);
+
+                try (final ResultSet result = statement.executeQuery()) {
+                    if (result.next()) {
+                        return rowToEntity(result);
+                    } else {
+                        throw new IllegalArgumentException("Invalid id");
+                    }
+                }
+            }
+        } catch (SQLException e) {
+            LOG.log(Level.SEVERE, "Error getting a pet", e);
+            throw new DAOException(e);
+        }
+    }
+
+    public List<Pet> list() throws DAOException {
+        try (final Connection conn = this.getConnection()) {
+            final String query = "SELECT * FROM pets";
+
+            try (final PreparedStatement statement = conn.prepareStatement(query)) {
+                try (final ResultSet result = statement.executeQuery()) {
+                    final List<Pet> pets = new LinkedList<>();
+
+                    while (result.next()) {
+                        pets.add(rowToEntity(result));
+                    }
+
+                    return pets;
+                }
+            }
+        } catch (SQLException e) {
+            LOG.log(Level.SEVERE, "Error listing pets", e);
+            throw new DAOException(e);
+        }
+    }
+
+    public List<Pet> peoplePets(int peopleId) throws DAOException {
+        try(final Connection conn = this.getConnection()){
+            final String query = "SELECT * FROM pets WHERE owner= ?";
+
+            try(final PreparedStatement stmt = conn.prepareStatement(query)) {
+                stmt.setInt(1,peopleId);
+                try(final ResultSet result = stmt.executeQuery()) {
+                    final List<Pet> pets = new LinkedList<>();
+                    while (result.next()) {
+                        pets.add(rowToEntity(result));
+                    }
+                    return pets;
+                }
+            }
+        } catch (SQLException e){
+            LOG.log(Level.SEVERE, "Error peoplePets", e);
+            throw new DAOException(e);
+        }
+    }
+
+    public Pet add(Pet pet)
+            throws DAOException, IllegalArgumentException {
+        if (pet==null) {
+            throw new IllegalArgumentException("Pet is null!");
+        }
+
+        try (Connection conn = this.getConnection()) {
+            final String query = "INSERT INTO pets(name, kind, breed, owner) VALUES (?,?,?,?)";
+
+            try (PreparedStatement statement = conn.prepareStatement(query, Statement.RETURN_GENERATED_KEYS)) {
+                statement.setString(1, pet.getName());
+                statement.setString(2, pet.getKind());
+                statement.setString(3, pet.getBreed());
+                statement.setInt(4, pet.getOwner());
+
+                if (statement.executeUpdate() == 1) {
+                	return pet;
+                } else {
+                    LOG.log(Level.SEVERE, "Error inserting value");
+                    throw new SQLException("Error inserting value");
+                }
+            }
+        } catch (SQLException e) {
+            LOG.log(Level.SEVERE, "Error adding a pet", e);
+            throw new DAOException(e);
+        }
+    }
+
+
+    public void modify(Pet pet)
+            throws DAOException, IllegalArgumentException {
+        if (pet == null) {
+            throw new IllegalArgumentException("pet can't be null");
+        }
+
+        try (Connection conn = this.getConnection()) {
+            final String query = "UPDATE pets SET name=?, kind=?, breed=?, owner=? WHERE id=?";
+
+            try (PreparedStatement statement = conn.prepareStatement(query)) {
+                statement.setString(1, pet.getName());
+                statement.setString(2, pet.getKind());
+                statement.setString(3, pet.getBreed());
+                statement.setInt(4,pet.getOwner());
+                statement.setInt(5,pet.getId());
+
+                if (statement.executeUpdate() != 1) {
+                    throw new IllegalArgumentException("name, kind and breed can't be null");
+                }
+            }
+        } catch (SQLException e) {
+            LOG.log(Level.SEVERE, "Error modifying a pet", e);
+            throw new DAOException();
+        }
+    }
+
+
+    public void delete(int id)
+            throws DAOException, IllegalArgumentException {
+        try (final Connection conn = this.getConnection()) {
+            final String query = "DELETE FROM pets WHERE id= ?";
+
+            try (final PreparedStatement statement = conn.prepareStatement(query)) {
+                statement.setInt(1, id);
+                if (statement.executeUpdate() != 1) {
+                    throw new IllegalArgumentException("Invalid id");
+                }
+            }
+        } catch (SQLException e) {
+            LOG.log(Level.SEVERE, "Error deleting pet: "+ id, e);
+            throw new DAOException(e);
+        }
+    }
+
+    private Pet rowToEntity(ResultSet row) throws SQLException {
+        return new Pet(
+                row.getInt("id"),
+                row.getString("name"),
+                row.getString("kind"),
+                row.getString("breed"),
+                row.getInt("owner")
+        );
+    }
+}

src/main/java/es/uvigo/esei/daa/entities/Pet.java

+package es.uvigo.esei.daa.entities;
+
+public class Pet {
+	
+    private int id;
+	private String name;
+	private String kind;
+	private String breed;
+	private int owner;
+	
+	Pet(){}
+	
+	public Pet(int id, String name, String kind, String breed, int owner) {
+		this.setName(name);
+		this.setKind(kind);
+		this.setBreed(breed);
+		this.setOwner(owner);
+	}
+	
+	public int getId() {
+		return id;
+	}
+	
+	public void setId(int id) {
+		this.id = id;
+	}
+	
+	public String getName() {
+		return name;
+	}
+	
+	public void setName(String name) {
+		this.name = name;
+	}
+	
+	public String getKind() {
+		return kind;
+	}
+	
+	public void setKind(String kind) {
+		this.kind = kind;
+	}
+	
+	public String getBreed() {
+		return breed;
+	}
+	
+	public void setBreed(String breed) {
+		this.breed = breed;
+	}
+	
+	public int getOwner() {
+		return owner;
+	}
+	
+	public void setOwner(int owner) {
+		this.owner = owner;
+	}
+	
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = 1;
+		result = (int) (prime * result + id);
+		return result;
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj)
+			return true;
+		if (obj == null)
+			return false;
+		if (!(obj instanceof Pet))
+			return false;
+		Pet other = (Pet) obj;
+		if (id != other.id)
+			return false;
+		return true;
+	}
+}
+