3段階目（DAOのIDによる検索メソッドを作成→条件検索完成）

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

@@ -12,6 +12,7 @@ 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;
@@ -72,4 +73,45 @@ public class EmployeeDAO {
 		return rtnList;
 	}
 
+	/**
+	 * 社員テーブルから社員IDに合致する情報を取得する
+	 *
+	 * @return 検索結果
+	 * @throws SQLException
+	 * @throws ClassNotFoundException
+	 * @throws NumberFormatException
+	 */
+	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("    " + "*");
+		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());
+			rs = stmt.executeQuery();
+			while (rs.next()) {
+
+				EmployeeDTO dto = new EmployeeDTO(rs.getInt(ID_EMPLOYEE), rs.getString(NM_EMPLOYEE),
+						rs.getString(KN_EMPLOYEE), rs.getString(MAIL_ADDRESS), rs.getString(PASSWORD),
+						rs.getInt(ID_DEPARTMENT));
+				rtnList.add(dto);
+
+			}
+		} finally {
+			DbUtil.closeStatement(this.stmt);
+		}
+		if (rtnList.size() == 0) {
+			System.out.println("入力された値で情報がみつかりませんでした");
+		}
+		return rtnList;
+	}
 }

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

@@ -87,6 +87,9 @@ public class Main {
 			case "1":
 				empList = empDao.selectAll();
 				break;
+			case "2":
+				empList = empDao.selectById​(Integer.parseInt(inputCheck("ID", true)));
+				break;
 			default:
 				return;
 			}