From 00cf2096e29ad95ca54b61df996f10c2e0aba7ad Mon Sep 17 00:00:00 2001
From: m-shimizu <26-m-e-stella-tecnica@it-college.jp>
Date: Wed, 30 Sep 2026 14:11:22 +0900
Subject: [PATCH] =?UTF-8?q?3=E6=AE=B5=E9=9A=8E=E7=9B=AE=EF=BC=88DAO?=
 =?UTF-8?q?=E3=81=AEID=E3=81=AB=E3=82=88=E3=82=8B=E6=A4=9C=E7=B4=A2?=
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---
 src/com/rhizome/example/dao/EmployeeDAO.java | 30 ++++++++++++++++++++
 src/com/rhizome/example/main/Main.java       | 25 ++++++++++------
 2 files changed, 47 insertions(+), 8 deletions(-)

diff --git a/src/com/rhizome/example/dao/EmployeeDAO.java b/src/com/rhizome/example/dao/EmployeeDAO.java
index b9a0cfc..fd28229 100644
--- a/src/com/rhizome/example/dao/EmployeeDAO.java
+++ b/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;
+	}
+
 }
diff --git a/src/com/rhizome/example/main/Main.java b/src/com/rhizome/example/main/Main.java
index 0e080e6..707b000 100644
--- a/src/com/rhizome/example/main/Main.java
+++ b/src/com/rhizome/example/main/Main.java
@@ -87,18 +87,27 @@ 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;
 			}
-			for (EmployeeDTO emp : empList) {
-				System.out.println(
-						emp.getIdEmployee() + " "
-								+ emp.getNmEmployee() + " "
-								+ emp.getKnEmployee() + " "
-								+ emp.getMailAddress() + " "
-								+ emp.getPassword() + " "
-								+ emp.getIdDepartment());
+			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() + " "
+									+ emp.getNmEmployee() + " "
+									+ emp.getKnEmployee() + " "
+									+ emp.getMailAddress() + " "
+									+ emp.getPassword() + " "
+									+ emp.getIdDepartment());
+				}
 			}
+
 		} finally {
 			DbUtil.closeConnection(empDao.con);
 		}