RowMapperResultReader (Spring Framework) - Spring Framework 1.2.9 API 文档英文版

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org.springframework.jdbc.core
Class RowMapperResultReader

java.lang.Object
  org.springframework.jdbc.core.RowMapperResultReader

All Implemented Interfaces:: ResultReader, RowCallbackHandler

public class RowMapperResultReader
extends Object
implements ResultReader
extends Object
implements ResultReader

Adapter implementation of the ResultReader interface that delegates to a RowMapper which is supposed to create an object for each row. Each object is added to the results list of this ResultReader.

Useful for the typical case of one object per row in the database table. The number of entries in the results list will match the number of rows.

Note that a RowMapper object is typically stateless and thus reusable; just the RowMapperResultReader adapter is stateful.

A usage example with JdbcTemplate:

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

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

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

Alternatively, consider subclassing MappingSqlQuery from the jdbc.object package: Instead of working with separate JdbcTemplate and RowMapper objects, you can have executable query objects (containing row-mapping logic) there.

Since:: 1.0.2
Author:: Juergen Hoeller
See Also:: RowMapper, DataAccessUtils.singleResult(java.util.Collection), MappingSqlQuery

Constructor Summary

RowMapperResultReader(RowMapper rowMapper)
          Create a new RowMapperResultReader.

RowMapperResultReader(RowMapper rowMapper, int rowsExpected)
          Create a new RowMapperResultReader.

Method Summary

List getResults()
          Return all results, disconnected from the JDBC ResultSet.

void processRow(ResultSet rs)
          Implementations must implement this method to process each row of data in the ResultSet.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Summary
`RowMapperResultReader(RowMapper rowMapper)` Create a new RowMapperResultReader.
`RowMapperResultReader(RowMapper rowMapper, int rowsExpected)` Create a new RowMapperResultReader.

Method Summary
`List`	`getResults()` Return all results, disconnected from the JDBC ResultSet.
`void`	`processRow(ResultSet rs)` Implementations must implement this method to process each row of data in the ResultSet.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail