3段階目（DAOのIDによる検索メソッドを作成→条件検索完成）

src/com/rhizome/example/dao/EmployeeDAO.java

@@ -77,4 +77,34 @@ public class EmployeeDAO {
 		return rtnList;
 	}
 
+	public List<EmployeeDTO> selectById(int id) throws SQLException, ClassNotFoundException {
+		List<EmployeeDTO> rtnList = new ArrayList<>();
+		StringBuilder sql = new StringBuilder();
+		sql.append(" SELECT ");
+		sql.append(" * ");
+		sql.append(" FROM ");
+		sql.append(TBL_NAME);
+		sql.append(" WHERE ID_EMPLOYEE = ? ");
+		try {
+
+			this.stmt = con.prepareStatement(sql.toString());
+			this.stmt.setInt(1, id);
+			rs = this.stmt.executeQuery();
+			while (rs.next()) {
+				EmployeeDTO dto = new EmployeeDTO();
+				dto.setIdEmployee(rs.getInt(ID_EMPLOYEE));
+				dto.setNmEmployee(rs.getString(NM_EMPLOYEE));
+				dto.setKnEmployee(rs.getString(KN_EMPLOYEE));
+				dto.setMailAddress(rs.getString(MAIL_ADDRESS));
+				dto.setPassword(rs.getString(PASSWORD));
+				dto.setIdDepartment(rs.getInt(ID_DEPARTMENT));
+
+				rtnList.add(dto);
+			}
+		} finally {
+			DbUtil.closeStatement(this.stmt);
+		}
+		return rtnList;
+	}
+
 }

src/com/rhizome/example/main/Main.java

@@ -87,9 +87,16 @@ public class Main {
 			case "1":
 				empList = empDao.selectAll();
 				break;
+			case "2":
+				String id = inputCheck("ID", true);
+				empList = empDao.selectById(Integer.parseInt(id));
+				break;
 			default:
 				return;
 			}
+			if (empList.isEmpty()) {
+				System.out.println("入力された値で情報がみつかりませんでした");
+			} else {
 				for (EmployeeDTO emp : empList) {
 					System.out.println(
 							emp.getIdEmployee() + " "
@@ -99,6 +106,8 @@ public class Main {
 									+ emp.getPassword() + " "
 									+ emp.getIdDepartment());
 				}
+			}
+
 		} finally {
 			DbUtil.closeConnection(empDao.con);
 		}