2段階目完了

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

@@ -61,6 +61,7 @@ public class EmployeeDAO {
 			this.stmt = con.prepareStatement(sql.toString());
 			rs = stmt.executeQuery();
 			while (rs.next()) {
+				//インスタンス生成
 				EmployeeDTO dto = new EmployeeDTO();
 				dto.setId_employee(rs.getInt("id_employee"));
 				dto.setNm_employee(rs.getString("nm_employee"));
@@ -71,37 +72,9 @@ public class EmployeeDAO {
 				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<>();
-		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());
-			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"));
-				rtnList2.add(dto);
-			}
-		} finally {
-			DbUtil.closestatement(this.stmt);
-		}
-		return rtnList2;
-	}
-
 }

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

@@ -1,14 +1,15 @@
 package com.rhizome.example.dto;
 
 public class EmployeeDTO {
+	//フィールド宣言
+	private Integer id_employee;//社員ID
+	private String nm_employee;//社員名
+	private String kn_employee;//社員名カナ
+	private String mail_address;//メールアドレス
+	private String password;//パスワード
+	private Integer id_department;//部署ID
 
-	private Integer id_employee;
-	private String nm_employee;
-	private String kn_employee;
-	private String mail_address;
-	private String password;
-	private Integer id_department;
-
+	//getter/setter
 	public Integer getId_employee() {
 		return id_employee;
 	}
@@ -57,13 +58,4 @@ public class EmployeeDTO {
 		this.id_department = id_department;
 	}
 
-	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

@@ -87,11 +87,6 @@ public class Main {
 			case "1":
 				empList = empDao.selectAll();
 				break;
-			case "2":
-				System.out.println("IDを入力してください");
-				
-				empList = empDao.selectById(tblFlg);
-				break;
 			default:
 				return;
 			}

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

@@ -45,7 +45,7 @@ public class DbUtil {
 	 * 				  ※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
+		//データベースへの接続
 		con = DriverManager.getConnection(DB_URL, DB_USER, DB_PASS);
 		return con;
 	}
@@ -59,10 +59,9 @@ 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 {
+		//nullチェック
+		if (stmt != null) {
 			stmt.close();
 		}
 	}
@@ -77,8 +76,10 @@ public class DbUtil {
 	 * 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)) {
+		//nullチェック
+		if (con != null) {
 			con.close();
+
 		}
 	}
 }