JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);  // reusable object
 RowMapper rowMapper = new UserRowMapper();  // reusable object

 List allUsers = (List) jdbcTemplate.query(
     "select * from user",
     new RowMapperResultSetExtractor(rowMapper, 10));

 User user = (User) jdbcTemplate.queryForObject(
     "select * from user where id=?", new Object[] {id},
     new RowMapperResultSetExtractor(rowMapper, 1));

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我也不懂 来学习了。

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探讨

RowMapperResultSetExtractor里的第二参数表示什么啊？如new RowMapperResultSetExtractor(rowMapper, 1))或 
new RowMapperResultSetExtractor(rowMapper, 10))里的1和10 


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记录数，如果是0的话，就不限制记录数