1段階目です。

.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

@@ -13,7 +13,6 @@ import java.sql.SQLException;
 import java.util.ArrayList;
 import java.util.List;
 
-import com.rhizome.example.dto.EmployeeDTO;
 import com.rhizome.example.util.DbUtil;
 
 public class EmployeeDAO {
@@ -49,8 +48,8 @@ public class EmployeeDAO {
 	 * @throws SQLException
 	 * @throws ClassNotFoundException
 	 */
-	public List<EmployeeDTO> selectAll() throws SQLException, ClassNotFoundException {
-		List<EmployeeDTO> rtnList = new ArrayList<>();
+	public List<String> selectAll() throws SQLException, ClassNotFoundException {
+		List<String> rtnList = new ArrayList<>();
 		StringBuilder sql = new StringBuilder();
 		sql.append(" SELECT ");
 		sql.append("    " + "*");
@@ -61,47 +60,12 @@ public class EmployeeDAO {
 			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"));
-				rtnList.add(dto);
+				rtnList.add(rs.getString(NM_EMPLOYEE));
 			}
 		} 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

@@ -1,69 +0,0 @@
-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 String password;
-	private Integer id_department;
-
-	public Integer getId_employee() {
-		return id_employee;
-	}
-
-	public void setId_employee(Integer id_employee) {
-		this.id_employee = id_employee;
-	}
-
-	public String getNm_employee() {
-		return nm_employee;
-	}
-
-	public void setNm_employee(String nm_employee) {
-		this.nm_employee = nm_employee;
-	}
-
-	public String getKn_employee() {
-		return kn_employee;
-	}
-
-	public void setKn_employee(String kn_employee) {
-		this.kn_employee = kn_employee;
-	}
-
-	public String getMail_address() {
-		return mail_address;
-	}
-
-	public void setMail_address(String mail_address) {
-		this.mail_address = mail_address;
-	}
-
-	public String getPassword() {
-		return password;
-	}
-
-	public void setPassword(String password) {
-		this.password = password;
-	}
-
-	public Integer getId_department() {
-		return id_department;
-	}
-
-	public void setId_department(Integer id_department) {
-		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

@@ -7,7 +7,6 @@ import java.util.List;
 import java.util.Scanner;
 
 import com.rhizome.example.dao.EmployeeDAO;
-import com.rhizome.example.dto.EmployeeDTO;
 import com.rhizome.example.util.DbUtil;
 
 /**
@@ -77,7 +76,7 @@ public class Main {
 	 * @throws SQLException
 	 */
 	public static void empSelect() throws ClassNotFoundException, SQLException {
-		List<EmployeeDTO> empList = new ArrayList<>();
+		List<String> empList = new ArrayList<>();
 		Connection con = DbUtil.getConnection();
 		EmployeeDAO empDao = new EmployeeDAO(con);
 		System.out.println("1:全検索 2:条件検索 それ以外:戻る");
@@ -87,15 +86,10 @@ 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;
 			}
-			for (EmployeeDTO emp : empList) {
+			for (String emp : empList) {
 				System.out.println(emp);
 			}
 		} finally {

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

@@ -44,10 +44,18 @@ 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
-		con = DriverManager.getConnection(DB_URL, DB_USER, DB_PASS);
-		return con;
+	public static Connection getConnection() throws ClassNotFoundException, SQLException {
+		try {
+			Class.forName(DB_DRIVER);
+			return DriverManager.getConnection(DB_URL, DB_USER, DB_PASS);
+		} catch (ClassNotFoundException e) {
+			System.out.println();
+			throw e;
+		} catch (SQLException e) {
+			System.out.println();
+			throw e;
+		}
+
 	}
 
 	/*
@@ -59,11 +67,13 @@ 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) {
+		if (stmt != null) {
+			try {
 				stmt.close();
+			} catch (SQLException e) {
+				System.out.println();
+			}
 		}
 	}
 
@@ -76,9 +86,16 @@ 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) {
+		if (con != null) {
+			try {
+				if (!con.isClosed()) {
 					con.close();
 				}
+			} catch (SQLException e) {
+				e.printStackTrace();
 			}
 		}
+	}
+
+}