java.lang.Object
- org.springframework.jdbc.core.support.AbstractLobStreamingResultSetExtractor<T>

所有已实现的接口:: ResultSetExtractor<T>

public abstract class AbstractLobStreamingResultSetExtractor<T>
extends Object
implements ResultSetExtractor<T>

Abstract ResultSetExtractor implementation that assumes streaming of LOB data. Typically used as inner class, with access to surrounding method arguments.

Delegates to the streamData template method for streaming LOB content to some OutputStream, typically using a LobHandler. Converts an IOException thrown during streaming to a LobRetrievalFailureException.

A usage example with JdbcTemplate:

JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);  // reusable object
 final LobHandler lobHandler = new DefaultLobHandler();  // reusable object

 jdbcTemplate.query(
                 "SELECT content FROM imagedb WHERE image_name=?", new Object[] {name},
                 new AbstractLobStreamingResultSetExtractor() {
                         public void streamData(ResultSet rs) throws SQLException, IOException {
                                 FileCopyUtils.copy(lobHandler.getBlobAsBinaryStream(rs, 1), contentStream);
             }
         }
 );

从以下版本开始:: 1.0.2
作者:: Juergen Hoeller
另请参阅:: LobHandler, LobRetrievalFailureException

构造器概要
构造器
构造器说明
AbstractLobStreamingResultSetExtractor()

方法概要

所有方法实例方法抽象方法具体方法
修饰符和类型	方法	说明
`T`	`extractData(ResultSet rs)`	Delegates to handleNoRowFound, handleMultipleRowsFound and streamData, according to the ResultSet state.
`protected void`	`handleMultipleRowsFound()`	Handle the case where the ResultSet contains multiple rows.
`protected void`	`handleNoRowFound()`	Handle the case where the ResultSet does not contain a row.
`protected abstract void`	`streamData(ResultSet rs)`	Stream LOB content from the given ResultSet to some OutputStream.

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 构造器详细资料
  - AbstractLobStreamingResultSetExtractor
```
public AbstractLobStreamingResultSetExtractor()
```
- 方法详细资料
  - extractData
```
public final T extractData(ResultSet rs)
                    throws SQLException,
                           DataAccessException
```
    Delegates to handleNoRowFound, handleMultipleRowsFound and streamData, according to the ResultSet state. Converts an IOException thrown by streamData to a LobRetrievalFailureException.
    指定者:
    extractData 在接口中 ResultSetExtractor<T>
    参数:
    rs - ResultSet to extract data from. Implementations should not close this: it will be closed by the calling JdbcTemplate.
    返回:
    an arbitrary result object, or null if none (the extractor will typically be stateful in the latter case).
    抛出:
    SQLException - if a SQLException is encountered getting column values or navigating (that is, there's no need to catch SQLException)
    DataAccessException - in case of custom exceptions
    另请参阅:
    handleNoRowFound(), handleMultipleRowsFound(), streamData(java.sql.ResultSet), LobRetrievalFailureException
  - handleNoRowFound
```
protected void handleNoRowFound()
                         throws DataAccessException
```
    Handle the case where the ResultSet does not contain a row.
    抛出:
    DataAccessException - a corresponding exception, by default an EmptyResultDataAccessException
    另请参阅:
    EmptyResultDataAccessException
  - handleMultipleRowsFound
```
protected void handleMultipleRowsFound()
                                throws DataAccessException
```
    Handle the case where the ResultSet contains multiple rows.
    抛出:
    DataAccessException - a corresponding exception, by default an IncorrectResultSizeDataAccessException
    另请参阅:
    IncorrectResultSizeDataAccessException
  - streamData
```
protected abstract void streamData(ResultSet rs)
                            throws SQLException,
                                   IOException,
                                   DataAccessException
```
    Stream LOB content from the given ResultSet to some OutputStream.
    Typically used as inner class, with access to surrounding method arguments and to a LobHandler instance variable of the surrounding class.
    参数:
    rs - the ResultSet to take the LOB content from
    抛出:
    SQLException - if thrown by JDBC methods
    IOException - if thrown by stream access methods
    DataAccessException - in case of custom exceptions
    另请参阅:
    LobHandler.getBlobAsBinaryStream(java.sql.ResultSet, java.lang.String), FileCopyUtils

类 AbstractLobStreamingResultSetExtractor<T>

构造器概要

方法概要

从类继承的方法 java.lang.Object

构造器详细资料

AbstractLobStreamingResultSetExtractor

方法详细资料

extractData

handleNoRowFound

handleMultipleRowsFound

streamData