Here you can find the source of getString(ResultSet rs, String columnName)
@CheckForNull
public static String getString(ResultSet rs, String columnName) throws SQLException
//package com.java2s; /*/*from ww w . ja v a 2s .c o m*/ * SonarQube * Copyright (C) 2009-2017 SonarSource SA * mailto:info AT sonarsource DOT com * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 3 of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program; if not, write to the Free Software Foundation, * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ import java.sql.ResultSet; import java.sql.SQLException; import javax.annotation.CheckForNull; public class Main { @CheckForNull public static String getString(ResultSet rs, String columnName) throws SQLException { String s = rs.getString(columnName); return rs.wasNull() ? null : s; } @CheckForNull public static String getString(ResultSet rs, int columnIndex) throws SQLException { String s = rs.getString(columnIndex); return rs.wasNull() ? null : s; } }