4段階目（DAOのデータ削除メソッドを作成→削除処理完成）

.classpath

@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<classpath>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
-	<classpathentry kind="src" path="src"/>
-	<classpathentry kind="lib" path="lib/mysql-connector-java-8.0.23.jar"/>
-	<classpathentry kind="lib" path="実行例/DAO_Simple.jar"/>
-	<classpathentry kind="output" path="bin"/>
-</classpath>

.gitignore

@@ -1 +0,0 @@
-/bin/

.project

@@ -1,23 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<projectDescription>
-	<name>em-jdbc</name>
-	<comment></comment>
-	<projects>
-	</projects>
-	<buildSpec>
-		<buildCommand>
-			<name>org.eclipse.wst.validation.validationbuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-		<buildCommand>
-			<name>org.eclipse.jdt.core.javabuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-	</buildSpec>
-	<natures>
-		<nature>org.eclipse.jdt.core.javanature</nature>
-		<nature>org.eclipse.wst.jsdt.core.jsNature</nature>
-	</natures>
-</projectDescription>

.settings/.jsdtscope

@@ -1,7 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<classpath>
-	<classpathentry kind="con" path="org.eclipse.wst.jsdt.launching.JRE_CONTAINER"/>
-	<classpathentry kind="con" path="org.eclipse.wst.jsdt.launching.baseBrowserLibrary"/>
-	<classpathentry kind="src" path=""/>
-	<classpathentry kind="output" path=""/>
-</classpath>

.settings/org.eclipse.wst.jsdt.ui.superType.container

@@ -1 +0,0 @@
-org.eclipse.wst.jsdt.launching.JRE_CONTAINER

.settings/org.eclipse.wst.jsdt.ui.superType.name

@@ -1 +0,0 @@
-Global

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

@@ -62,46 +62,65 @@ public class EmployeeDAO {
 			rs = stmt.executeQuery();
 			while (rs.next()) {
 				EmployeeDTO dto = new EmployeeDTO();
-				dto.setId_employee(rs.getInt("id_employee"));
-				dto.setNm_employee(rs.getString("nm_employee"));
-				dto.setKn_employee(rs.getString("kn_employee"));
-				dto.setMail_address(rs.getString("mail_address"));
-				dto.setPassword(rs.getString("password"));
-				dto.setId_department(rs.getInt("id_department"));
+				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);
+			DbUtil.closeStatement(this.stmt);
 		}
 		return rtnList;
 	}
 
-	public List<EmployeeDTO> selectById(int id_employee) throws SQLException, ClassNotFoundException {
-		List<EmployeeDTO> rtnList2 = new ArrayList<>();
+	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(" * ");
 		sql.append(" FROM ");
-		sql.append("    " + TBL_NAME);
-		sql.append(" WHERE " + ID_EMPLOYEE+ "=?");
+		sql.append(TBL_NAME);
+		sql.append(" WHERE ID_EMPLOYEE = ? ");
 		try {
 
 			this.stmt = con.prepareStatement(sql.toString());
-			rs = stmt.executeQuery();
+			this.stmt.setInt(1, id);
+			rs = this.stmt.executeQuery();
 			while (rs.next()) {
 				EmployeeDTO dto = new EmployeeDTO();
-				dto.setId_employee(rs.getInt("id_employee"));
-				dto.setNm_employee(rs.getString("nm_employee"));
-				dto.setKn_employee(rs.getString("kn_employee"));
-				dto.setMail_address(rs.getString("mail_address"));
-				dto.setPassword(rs.getString("password"));
-				dto.setId_department(rs.getInt("id_department"));
-				rtnList2.add(dto);
+				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);
+			DbUtil.closeStatement(this.stmt);
 		}
-		return rtnList2;
+		return rtnList;
 	}
 
+	//社員データ削除
+	public void empDelete(int id) throws SQLException {
+		StringBuilder sql = new StringBuilder();
+		sql.append(" DELETE ");
+		sql.append(" FROM ");
+		sql.append(TBL_NAME);
+		sql.append(" WHERE ID_EMPLOYEE = ? ");
+		try {
+			this.stmt = con.prepareStatement(sql.toString());
+			this.stmt.setInt(1, id);
+			this.stmt.executeUpdate();
+		} finally {
+			DbUtil.closeStatement(this.stmt);
+
+		}
+	}
 }

src/com/rhizome/example/dto/EmployeeDTO.java

@@ -1,44 +1,43 @@
 package com.rhizome.example.dto;
 
 public class EmployeeDTO {
-
-	private Integer id_employee;
-	private String nm_employee;
-	private String kn_employee;
-	private String mail_address;
+	private int idEmployee;
+	private String nmEmployee;
+	private String knEmployee;
+	private String mailAddress;
 	private String password;
-	private Integer id_department;
+	private int idDepartment;
 
-	public Integer getId_employee() {
-		return id_employee;
+	public int getIdEmployee() {
+		return idEmployee;
 	}
 
-	public void setId_employee(Integer id_employee) {
-		this.id_employee = id_employee;
+	public void setIdEmployee(int idEmployee) {
+		this.idEmployee = idEmployee;
 	}
 
-	public String getNm_employee() {
-		return nm_employee;
+	public String getNmEmployee() {
+		return nmEmployee;
 	}
 
-	public void setNm_employee(String nm_employee) {
-		this.nm_employee = nm_employee;
+	public void setNmEmployee(String nmEmployee) {
+		this.nmEmployee = nmEmployee;
 	}
 
-	public String getKn_employee() {
-		return kn_employee;
+	public String getKnEmployee() {
+		return knEmployee;
 	}
 
-	public void setKn_employee(String kn_employee) {
-		this.kn_employee = kn_employee;
+	public void setKnEmployee(String knEmployee) {
+		this.knEmployee = knEmployee;
 	}
 
-	public String getMail_address() {
-		return mail_address;
+	public String getMailAddress() {
+		return mailAddress;
 	}
 
-	public void setMail_address(String mail_address) {
-		this.mail_address = mail_address;
+	public void setMailAddress(String mailAddress) {
+		this.mailAddress = mailAddress;
 	}
 
 	public String getPassword() {
@@ -49,21 +48,12 @@ public class EmployeeDTO {
 		this.password = password;
 	}
 
-	public Integer getId_department() {
-		return id_department;
+	public int getIdDepartment() {
+		return idDepartment;
 	}
 
-	public void setId_department(Integer id_department) {
-		this.id_department = id_department;
+	public void setIdDepartment(int idDepartment) {
+		this.idDepartment = idDepartment;
 	}
 
-	public String toString() {
-		return id_employee + "\t"
-				+ nm_employee + "\t"
-				+ kn_employee + "\t"
-				+ mail_address + "\t"
-				+ password + "\t"
-				+ id_department;
-
-	}
 }

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

@@ -58,6 +58,7 @@ public class Main {
 		case "3":
 			break;
 		case "4":
+			empDelete();
 			break;
 		case "9":
 			return;
@@ -88,21 +89,59 @@ public class Main {
 				empList = empDao.selectAll();
 				break;
 			case "2":
-				System.out.println("IDを入力してください");
-				
-				empList = empDao.selectById(tblFlg);
+				String id = inputCheck("ID", true);
+				empList = empDao.selectById(Integer.parseInt(id));
 				break;
 			default:
 				return;
 			}
-			for (EmployeeDTO emp : empList) {
-				System.out.println(emp);
+			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);
 		}
 	}
 
+	//社員テーブルから情報を削除する
+	public static void empDelete()
+			throws ClassNotFoundException, SQLException {
+		Connection con = DbUtil.getConnection();
+		EmployeeDAO empDao = new EmployeeDAO(con);
+		String id = inputCheck("ID", true);
+
+		try {
+			List<EmployeeDTO> empList = empDao.selectById(Integer.parseInt(id));
+
+			if (empList.isEmpty()) {
+				System.out.println("入力されて値で情報がみつかりませんでした");
+			} else {
+				System.out.println("指定されたIDの情報を削除しますか? Y/y");
+				System.out.println("Y/y以外の入力であればキャンセル");
+
+				String confirm = sc.nextLine();
+
+				if (confirm.equalsIgnoreCase("y")) {
+					empDao.empDelete(Integer.parseInt(id));
+					System.out.println("削除が完了しました");
+				}
+			}
+		} finally {
+			DbUtil.closeConnection(con);
+		}
+	}
+
 	/**
 	 * フラグを判定し、テーブル名を取得する
 	 *

src/com/rhizome/example/util/DbUtil.java

@@ -44,9 +44,11 @@ public class DbUtil {
 	 * 				  生成されたConnectionを返却する
 	 * 				  ※Connection生成には上記の定数を活用してください
 	 */
-	public static Connection getConnection() throws SQLException {
-		//データベースの接続
+	public static Connection getConnection()
+			throws ClassNotFoundException, SQLException {
+		Class.forName(DB_DRIVER);
 		con = DriverManager.getConnection(DB_URL, DB_USER, DB_PASS);
+
 		return con;
 	}
 
@@ -59,10 +61,9 @@ public class DbUtil {
 	 * 例外			：SQLException
 	 * 処理			：引数のDBステートメントがnullでない場合、そのDBステートメントをクローズする
 	 */
-
-	public static void closestatement(PreparedStatement stmt) throws SQLException {
-		if (!stmt.equals(null)) {
-			//DBステートメントを閉じる
+	public static void closeStatement(PreparedStatement stmt)
+			throws SQLException {
+		if (stmt != null) {
 			stmt.close();
 		}
 	}
@@ -76,9 +77,11 @@ public class DbUtil {
 	 * 例外			：SQLException
 	 * 処理			：引数のコネクションがnullでない場合、そのコネクションを切断する
 	 */
-	public static void closeConnection(Connection con) throws SQLException {
-		if (!con.equals(null)) {
+	public static void closeConnection(Connection con)
+			throws SQLException {
+		if (con != null) {
 			con.close();
 		}
 	}
+
 }