RowMapperResultSetExtractor (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.jdbc.core
Class RowMapperResultSetExtractor

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

All Implemented Interfaces:: ResultSetExtractor

public class RowMapperResultSetExtractor
extends Object
implements ResultSetExtractor
extends Object
implements ResultSetExtractor

Adapter implementation of the ResultSetExtractor 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 ResultSetExtractor.

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 RowMapperResultSetExtractor adapter is stateful.

A usage example with JdbcTemplate:

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));

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, JdbcTemplate, MappingSqlQuery

Constructor Summary

RowMapperResultSetExtractor(RowMapper rowMapper)
          Create a new RowMapperResultSetExtractor.

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

Method Summary

Object extractData(ResultSet rs)
          Implementations must implement this method to process the entire ResultSet.

Methods inherited from class java.lang.Object

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

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

Method Summary
`Object`	`extractData(ResultSet rs)` Implementations must implement this method to process the entire ResultSet.

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

Constructor Detail