Spring queryformap method: query results are saved in the map collection

Grammar 1

queryForMap(String sql)

Example

public static void main(String[] args){
  ApplicationContext context = new ClassPathXmlApplicationContext("cfg/XMLConfig.xml");  //加载配置文件
  Dao dao = (Dao)context.getBean("dao");  //创建Dao
  JdbcTemplate jtm = dao.getJdbcTemplate();
  String sql = "select*from tb_user where id=1";  //创建一条sql语句
  Map map = jtm.queryForMap(sql);
  System.out.println(map);
}

Grammar 2

queryForMap(String sql,Object[] args)

Example

public static void main(String[] args){
  ApplicationContext context = new ClassPathXmlApplicationContext("cfg/XMLConfig.xml");  //加载配置文件
  Dao dao = (Dao)context.getBean("dao");  //创建Dao
  JdbcTemplate jtm = dao.getJdbcTemplate();
  String sql = "select*from tb_user where age=?and sex=?limit 1";  //创建一条sql语句
  Object[] sqlArgs = {27,"男"};
  Map map = jtm.queryForMap(sql,sqlArgs);
  System.out.println(map);
}