java.lang.Object
- org.springframework.batch.item.ItemStreamSupport
- - org.springframework.batch.item.support.AbstractItemStreamItemReader<T>
  - - org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader<T>
    - - org.springframework.batch.item.database.AbstractPagingItemReader<T>
      - org.springframework.batch.item.database.HibernatePagingItemReader<T>

所有已实现的接口:
ItemReader<T>, ItemStream, ItemStreamReader<T>, org.springframework.beans.factory.InitializingBean
```
public class HibernatePagingItemReader<T>
extends AbstractPagingItemReader<T>
implements org.springframework.beans.factory.InitializingBean
```
ItemReader for reading database records built on top of Hibernate and reading only up to a fixed number of items at a time. It executes an HQL query when initialized is paged as the AbstractItemCountingItemStreamItemReader.read() method is called. The query can be set directly using setQueryString(String), a named query can be used by setQueryName(String), or a query provider strategy can be supplied via setQueryProvider(HibernateQueryProvider).
The reader can be configured to use either StatelessSession sufficient for simple mappings without the need to cascade to associated objects or standard hibernate Session for more advanced mappings or when caching is desired. When stateful session is used it will be cleared in the AbstractItemCountingItemStreamItemReader.update(ExecutionContext) method without being flushed (no data modifications are expected).
The implementation is thread-safe in between calls to AbstractItemCountingItemStreamItemReader.open(ExecutionContext), but remember to use saveState=false if used in a multi-threaded client (no restart available).
从以下版本开始:
2.1
作者:
Dave Syer

字段概要
- 从类继承的字段 org.springframework.batch.item.database.AbstractPagingItemReader
  logger, results

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

方法概要

所有方法实例方法具体方法
修饰符和类型	方法	说明
`void`	`afterPropertiesSet()`	Check mandatory properties.
`protected void`	`doClose()`	Close the resources opened in `AbstractItemCountingItemStreamItemReader.doOpen()`.
`protected void`	`doJumpToPage(int itemIndex)`
`protected void`	`doOpen()`	Open resources necessary to start reading input.
`protected void`	`doReadPage()`
`void`	`setFetchSize(int fetchSize)`	Fetch size used internally by Hibernate to limit amount of data fetched from database per round trip.
`void`	`setParameterValues(java.util.Map<java.lang.String,java.lang.Object> parameterValues)`	The parameter values to apply to a query (map of name:value).
`void`	`setQueryName(java.lang.String queryName)`	A query name for an externalized query.
`void`	`setQueryProvider(HibernateQueryProvider<? extends T> queryProvider)`	A query provider.
`void`	`setQueryString(java.lang.String queryString)`	A query string in HQL.
`void`	`setSessionFactory(org.hibernate.SessionFactory sessionFactory)`	The Hibernate SessionFactory to use the create a session.
`void`	`setUseStatelessSession(boolean useStatelessSession)`	Can be set only in uninitialized state.

从类继承的方法 org.springframework.batch.item.database.AbstractPagingItemReader
doRead, getPage, getPageSize, jumpToItem, setPageSize

从类继承的方法 org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader
close, getCurrentItemCount, isSaveState, open, read, setCurrentItemCount, setMaxItemCount, setSaveState, update

从类继承的方法 org.springframework.batch.item.ItemStreamSupport
getExecutionContextKey, setExecutionContextName, setName

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
  - HibernatePagingItemReader
```
public HibernatePagingItemReader()
```
- 方法详细资料
  - setParameterValues
```
public void setParameterValues(java.util.Map<java.lang.String,java.lang.Object> parameterValues)
```
    The parameter values to apply to a query (map of name:value).
    参数:
    parameterValues - the parameter values to set
  - setQueryName
```
public void setQueryName(java.lang.String queryName)
```
    A query name for an externalized query. Either this or the { query string or the { query provider should be set.
    参数:
    queryName - name of a hibernate named query
  - setFetchSize
```
public void setFetchSize(int fetchSize)
```
    Fetch size used internally by Hibernate to limit amount of data fetched from database per round trip.
    参数:
    fetchSize - the fetch size to pass down to Hibernate
  - setQueryProvider
```
public void setQueryProvider(HibernateQueryProvider<? extends T> queryProvider)
```
    A query provider. Either this or the {query string or the {query name should be set.
    参数:
    queryProvider - Hibernate query provider
  - setQueryString
```
public void setQueryString(java.lang.String queryString)
```
    A query string in HQL. Either this or the { query provider or the { query name should be set.
    参数:
    queryString - HQL query string
  - setSessionFactory
```
public void setSessionFactory(org.hibernate.SessionFactory sessionFactory)
```
    The Hibernate SessionFactory to use the create a session.
    参数:
    sessionFactory - the SessionFactory to set
  - setUseStatelessSession
```
public void setUseStatelessSession(boolean useStatelessSession)
```
    Can be set only in uninitialized state.
    参数:
    useStatelessSession - true to use StatelessSessionfalse to use standard hibernate Session
  - afterPropertiesSet
```
public void afterPropertiesSet()
                        throws java.lang.Exception
```
    从类复制的说明: AbstractPagingItemReader
    Check mandatory properties.
    指定者:
    afterPropertiesSet 在接口中 org.springframework.beans.factory.InitializingBean
    覆盖:
    afterPropertiesSet 在类中 AbstractPagingItemReader<T>
    抛出:
    java.lang.Exception
    另请参阅:
    InitializingBean.afterPropertiesSet()
  - doOpen
```
protected void doOpen()
               throws java.lang.Exception
```
    从类复制的说明: AbstractItemCountingItemStreamItemReader
    Open resources necessary to start reading input.
    覆盖:
    doOpen 在类中 AbstractPagingItemReader<T>
    抛出:
    java.lang.Exception - Allows subclasses to throw checked exceptions for interpretation by the framework
  - doReadPage
```
protected void doReadPage()
```
    指定者:
    doReadPage 在类中 AbstractPagingItemReader<T>
  - doJumpToPage
```
protected void doJumpToPage(int itemIndex)
```
    指定者:
    doJumpToPage 在类中 AbstractPagingItemReader<T>
  - doClose
```
protected void doClose()
                throws java.lang.Exception
```
    从类复制的说明: AbstractItemCountingItemStreamItemReader
    Close the resources opened in AbstractItemCountingItemStreamItemReader.doOpen().
    覆盖:
    doClose 在类中 AbstractPagingItemReader<T>
    抛出:
    java.lang.Exception - Allows subclasses to throw checked exceptions for interpretation by the framework

类 HibernatePagingItemReader<T>

字段概要

从类继承的字段 org.springframework.batch.item.database.AbstractPagingItemReader

构造器概要

方法概要

从类继承的方法 org.springframework.batch.item.database.AbstractPagingItemReader

从类继承的方法 org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader

从类继承的方法 org.springframework.batch.item.ItemStreamSupport

从类继承的方法 java.lang.Object

构造器详细资料

HibernatePagingItemReader

方法详细资料

setParameterValues

setQueryName

setFetchSize

setQueryProvider

setQueryString

setSessionFactory

setUseStatelessSession

afterPropertiesSet

doOpen

doReadPage

doJumpToPage

doClose