org.springframework.batch.item.database

Class JdbcBatchItemWriter<T>

java.lang.Object

org.springframework.batch.item.database.JdbcBatchItemWriter<T>

All Implemented Interfaces:

ItemWriter<T>, org.springframework.beans.factory.InitializingBean

public class JdbcBatchItemWriter<T>
extends java.lang.Object
implements ItemWriter<T>, org.springframework.beans.factory.InitializingBean

ItemWriter that uses the batching features from NamedParameterJdbcTemplate to execute a batch of statements for all items provided.

The user must provide an SQL query and a special callback for either of ItemPreparedStatementSetter or ItemSqlParameterSourceProvider. You can use either named parameters or the traditional '?' placeholders. If you use the named parameter support then you should provide a ItemSqlParameterSourceProvider, otherwise you should provide a ItemPreparedStatementSetter. This callback would be responsible for mapping the item to the parameters needed to execute the SQL statement.
It is expected that write(List) is called inside a transaction.
The writer is thread-safe after its properties are set (normal singleton behavior), so it can be used to write in multiple concurrent transactions.

Since:

2.0

Author:

Dave Syer, Thomas Risberg, Michael Minella

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	assertUpdates
protected ItemPreparedStatementSetter<T>	itemPreparedStatementSetter
protected ItemSqlParameterSourceProvider<T>	itemSqlParameterSourceProvider
protected static org.apache.commons.logging.Log	logger
protected org.springframework.jdbc.core.namedparam.NamedParameterJdbcOperations	namedParameterJdbcTemplate
protected int	parameterCount
protected java.lang.String	sql
protected boolean	usingNamedParameters

Constructor Summary

Constructors

Constructor and Description
JdbcBatchItemWriter()

Method Summary

Modifier and Type	Method and Description
void	afterPropertiesSet() Check mandatory properties - there must be a NamedParameterJdbcOperations and an SQL statement plus a parameter source.
void	setAssertUpdates(boolean assertUpdates) Public setter for the flag that determines whether an assertion is made that all items cause at least one row to be updated.
void	setDataSource(javax.sql.DataSource dataSource) Public setter for the data source for injection purposes.
void	setItemPreparedStatementSetter(ItemPreparedStatementSetter<T> preparedStatementSetter) Public setter for the ItemPreparedStatementSetter.
void	setItemSqlParameterSourceProvider(ItemSqlParameterSourceProvider<T> itemSqlParameterSourceProvider) Public setter for the ItemSqlParameterSourceProvider.
void	setJdbcTemplate(org.springframework.jdbc.core.namedparam.NamedParameterJdbcOperations namedParameterJdbcTemplate) Public setter for the NamedParameterJdbcOperations.
void	setSql(java.lang.String sql) Public setter for the query string to execute on write.
void	write(java.util.List<? extends T> items) Process the supplied data element.

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected static final org.apache.commons.logging.Log logger

namedParameterJdbcTemplate

protected org.springframework.jdbc.core.namedparam.NamedParameterJdbcOperations namedParameterJdbcTemplate

itemPreparedStatementSetter

protected ItemPreparedStatementSetter<T> itemPreparedStatementSetter

itemSqlParameterSourceProvider

protected ItemSqlParameterSourceProvider<T> itemSqlParameterSourceProvider

sql

protected java.lang.String sql

assertUpdates

protected boolean assertUpdates

parameterCount

protected int parameterCount

usingNamedParameters

protected boolean usingNamedParameters

Constructor Detail

JdbcBatchItemWriter

public JdbcBatchItemWriter()

Method Detail

setAssertUpdates

public void setAssertUpdates(boolean assertUpdates)

Public setter for the flag that determines whether an assertion is made that all items cause at least one row to be updated.

Parameters:

assertUpdates - the flag to set. Defaults to true;

setSql

public void setSql(java.lang.String sql)

Public setter for the query string to execute on write. The parameters should correspond to those known to the ItemPreparedStatementSetter.

Parameters:

sql - the query to set

setItemPreparedStatementSetter

public void setItemPreparedStatementSetter(ItemPreparedStatementSetter<T> preparedStatementSetter)

Public setter for the ItemPreparedStatementSetter.

Parameters:

preparedStatementSetter - the ItemPreparedStatementSetter to set. This is required when using traditional '?' placeholders for the SQL statement.

setItemSqlParameterSourceProvider

public void setItemSqlParameterSourceProvider(ItemSqlParameterSourceProvider<T> itemSqlParameterSourceProvider)

Public setter for the ItemSqlParameterSourceProvider.

Parameters:

itemSqlParameterSourceProvider - the ItemSqlParameterSourceProvider to set. This is required when using named parameters for the SQL statement and the type to be written does not implement Map.

setDataSource

public void setDataSource(javax.sql.DataSource dataSource)

Public setter for the data source for injection purposes.

Parameters:

dataSource - DataSource to use for querying against

setJdbcTemplate

public void setJdbcTemplate(org.springframework.jdbc.core.namedparam.NamedParameterJdbcOperations namedParameterJdbcTemplate)

Public setter for the NamedParameterJdbcOperations.

Parameters:

namedParameterJdbcTemplate - the NamedParameterJdbcOperations to set

afterPropertiesSet

public void afterPropertiesSet()

Check mandatory properties - there must be a NamedParameterJdbcOperations and an SQL statement plus a parameter source.

Specified by:

afterPropertiesSet in interface org.springframework.beans.factory.InitializingBean

write

public void write(java.util.List<? extends T> items)
           throws java.lang.Exception

Description copied from interface: ItemWriter

Process the supplied data element. Will not be called with any null items in normal operation.

Specified by:

write in interface ItemWriter<T>

Parameters:

items - items to be written

Throws:

java.lang.Exception - if there are errors. The framework will catch the exception and convert or rethrow it as appropriate.