Spring uses RowMapper to encapsulate each row in the data into a user-defined class

1.dao

 Public Interface Mapperselecteallempdao {    public list<emp> all ();} 

2. Implementation class

 Public class extends Implements         Mapperselecteallempdao {    @Override    public list<emp> All () {        = " SELECT * from emp ";        ListThisnew  emprowmapper ());         return list;    }}

3. Inherit the RowMapper interface and return the custom type

 Public class Implements Rowmapper<emp> {    @Override    publicintthrows  SQLException {         New Emp ();        Emp.setid (Rs.getint ("id"));        Emp.setname (rs.getstring ("name"));        Emp.setage (Rs.getint ("age"));         return emp;    }}

4. Testing

@Test     // Spring uses RowMapper to query all records    in a table  Public void Rowmapperall () {        new  classpathxmlapplicationcontext (                " Applicationcontext.xml ");         = (Mapperselecteallempdao) AC                . Getbean ("Mapperall");        List<Emp> emplist = mapperselectall.all ();          for (Emp emp:emplist) {            System.out.println (Emp.getname ());        }    }

Spring uses RowMapper to encapsulate each row in the data into a user-defined class