From a6bd282b1c0b0adc74715be91565fab1f62e208d Mon Sep 17 00:00:00 2001
From: s-sakiyama <26-m-s-stella-tecnica@it-college.jp>
Date: Wed, 30 Sep 2026 12:39:56 +0900
Subject: [PATCH] =?UTF-8?q?4=E6=AE=B5=E9=9A=8E=E7=9B=AE=EF=BC=88DAO?=
 =?UTF-8?q?=E3=81=AE=E3=83=87=E3=83=BC=E3=82=BF=E5=89=8A=E9=99=A4=E3=83=A1?=
 =?UTF-8?q?=E3=82=BD=E3=83=83=E3=83=89=E3=82=92=E4=BD=9C=E6=88=90=E2=86=92?=
 =?UTF-8?q?=E5=89=8A=E9=99=A4=E5=87=A6=E7=90=86=E5=AE=8C=E6=88=90=EF=BC=89?=
MIME-Version: 1.0
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---
 src/com/rhizome/example/dao/EmployeeDAO.java | 35 ++++++++++--
 src/com/rhizome/example/main/Main.java       | 56 ++++++++++++++++++++
 2 files changed, 88 insertions(+), 3 deletions(-)

diff --git a/src/com/rhizome/example/dao/EmployeeDAO.java b/src/com/rhizome/example/dao/EmployeeDAO.java
index 867c635..0111ff5 100644
--- a/src/com/rhizome/example/dao/EmployeeDAO.java
+++ b/src/com/rhizome/example/dao/EmployeeDAO.java
@@ -12,7 +12,6 @@ import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.Scanner;
 
 import com.rhizome.example.dto.EmployeeDTO;
 import com.rhizome.example.util.DbUtil;
@@ -75,7 +74,8 @@ public class EmployeeDAO {
 
 	/**
 	 * 社員テーブルから社員IDに合致する情報を取得する
-	 *
+	 * @param id
+	 * 			検索する社員ID
 	 * @return 検索結果
 	 * @throws SQLException
 	 * @throws ClassNotFoundException
@@ -84,7 +84,6 @@ public class EmployeeDAO {
 	public List<EmployeeDTO> selectById​(int id)
 			throws java.sql.SQLException, java.lang.ClassNotFoundException, java.lang.NumberFormatException {
 		List<EmployeeDTO> rtnList = new ArrayList<>();
-		Scanner scanner = new Scanner(System.in);
 		StringBuilder sql = new StringBuilder();
 		sql.append(" SELECT ");
 		sql.append("    " + "*");
@@ -114,4 +113,34 @@ public class EmployeeDAO {
 		}
 		return rtnList;
 	}
+
+	/**
+	 * 社員テーブルの社員IDに合致する情報を削除する
+	 *
+	 * @param id
+	 *			削除ID
+	 * @throws ClassNotFoundException
+	 * @throws SQLException
+	 * @throws NumberFormatException
+	 */
+	public void empDelete​(int id)
+			throws java.lang.ClassNotFoundException, java.sql.SQLException, java.lang.NumberFormatException {
+		StringBuilder sql = new StringBuilder();
+		sql.append(" DELETE ");
+		sql.append(" FROM ");
+		sql.append("    " + TBL_NAME);
+		sql.append(" WHERE ");
+		sql.append("    " + ID_EMPLOYEE);
+		sql.append(" = ");
+		sql.append("    " + id);
+
+		try {
+			this.stmt = con.prepareStatement(sql.toString());
+			stmt.executeUpdate();
+			System.out.println("削除が完了しました");
+		} finally {
+			DbUtil.closeStatement(this.stmt);
+		}
+
+	}
 }
diff --git a/src/com/rhizome/example/main/Main.java b/src/com/rhizome/example/main/Main.java
index ecbb5bf..83086c3 100644
--- a/src/com/rhizome/example/main/Main.java
+++ b/src/com/rhizome/example/main/Main.java
@@ -58,6 +58,7 @@ public class Main {
 		case "3":
 			break;
 		case "4":
+			empDelete​();
 			break;
 		case "9":
 			return;
@@ -70,6 +71,39 @@ public class Main {
 		}
 	}
 
+	/**
+	 * 社員テーブルの社員IDに合致する情報を削除する
+	 *
+	 * @throws ClassNotFoundException
+	 * @throws SQLException
+	 */
+	public static void empDelete​()
+			throws java.lang.ClassNotFoundException, java.sql.SQLException, java.lang.NumberFormatException {
+		List<EmployeeDTO> rtnList = new ArrayList<>();
+		Connection con = DbUtil.getConnection();
+		EmployeeDAO empDao = new EmployeeDAO(con);
+		int id = Integer.parseInt(inputCheck("ID", true));
+		rtnList = empDao.selectById​(id);
+		if (rtnList.size() == 0) {
+			return;
+		}
+
+		System.out.println("指定されたIDの情報を削除します？ Y/y\r\n"
+				+ "（Y/y以外の入力であればキャンセル）");
+
+		String str = inputCheck(false);
+
+		if (!str.equalsIgnoreCase("y")) {
+			System.out.println("キャンセルしました");
+			return;
+		}
+		try {
+			empDao.empDelete​(id);
+		} finally {
+			DbUtil.closeConnection(empDao.con);
+		}
+	}
+
 	/**
 	 * 社員テーブルから情報を検索する
 	 *
@@ -150,4 +184,26 @@ public class Main {
 		}
 		return str;
 	}
+
+	public static String inputCheck(boolean flg) {
+		String str = null;
+		while (true) {
+			str = sc.nextLine();
+			if (str.trim().length() == 0) {
+
+				continue;
+			}
+			if (flg) {
+				if (str.trim().length() > 0) {
+					try {
+						Integer.parseInt(str);
+					} catch (NumberFormatException e) {
+						continue;
+					}
+				}
+			}
+			break;
+		}
+		return str;
+	}
 }