用JAVA执行语句sql语句

public List getRolePager(Long roleId) {

String sql = "select distinct(mid) from sj_sys_rolepmn where rid=?";

List l = pagerDao.query(sql, roleId);

return l;

}

public void updateRolePmn(Long roleId, String mids) {

//delete first

String sql = "delete from sj_sys_rolepmn where rid=?";

pagerDao.execute(sql, roleId);