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

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org.springframework.jdbc.object
Class BatchSqlUpdate

java.lang.Object
  org.springframework.jdbc.object.RdbmsOperation
      org.springframework.jdbc.object.SqlOperation
          org.springframework.jdbc.object.SqlUpdate
              org.springframework.jdbc.object.BatchSqlUpdate

All Implemented Interfaces:

InitializingBean

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public class BatchSqlUpdate
extends SqlUpdate

SqlUpdate subclass that performs batch update operations. Encapsulates queuing up records to be updated, and adds them as a single batch once flush is called or the given batch size has been met.

Note that this class is a non-thread-safe object, in contrast to all other JDBC operations objects in this package. You need to create a new instance of it for each use, or call reset before reuse within the same thread.

Since:

1.1

Author:

Keith Donald, Juergen Hoeller

See Also:

flush(), reset()

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Field Summary
static int	DEFAULT_BATCH_SIZE           Default number of inserts to accumulate before commiting a batch (5000).

 

Fields inherited from class org.springframework.jdbc.object.RdbmsOperation
logger

 

Constructor Summary
BatchSqlUpdate()           Constructor to allow use as a JavaBean.
BatchSqlUpdate(DataSource ds, String sql)           Construct an update object with a given DataSource and SQL.
BatchSqlUpdate(DataSource ds, String sql, int[] types)           Construct an update object with a given DataSource, SQL and anonymous parameters.
BatchSqlUpdate(DataSource ds, String sql, int[] types, int batchSize)           Construct an update object with a given DataSource, SQL, anonymous parameters and specifying the maximum number of rows that may be affected.

 

Method Summary
int[]	flush()           Trigger any queued update operations to be added as a final batch.
int	getExecutionCount()           Return the number of already executed statements.
int	getQueueCount()           Return the current number of statements or statement parameters in the queue.
int[]	getRowsAffected()           Return the number of affected rows for all already executed statements.
void	reset()           Reset the statement parameter queue, the rows affected cache, and the execution count.
void	setBatchSize(int batchSize)           Set the number of statements that will trigger an automatic intermediate flush.
void	setTrackRowsAffected(boolean trackRowsAffected)           Set whether to track the rows affected by batch updates performed by this operation object.
protected  boolean	supportsLobParameters()           BatchSqlUpdate does not support BLOB or CLOB parameters.
int	update(Object[] params)           Overridden version of update that adds the given statement parameters to the queue rather than executing them immediately.

 

Methods inherited from class org.springframework.jdbc.object.SqlUpdate
checkRowsAffected, setMaxRowsAffected, setRequiredRowsAffected, update, update, update, update, update, update, update, update

 

Methods inherited from class org.springframework.jdbc.object.SqlOperation
compileInternal, newPreparedStatementCreator, newPreparedStatementSetter, onCompileInternal

 

Methods inherited from class org.springframework.jdbc.object.RdbmsOperation

afterPropertiesSet, allowsUnusedParameters, checkCompiled, compile, declareParameter, getDeclaredParameters, getGeneratedKeysColumnNames, getJdbcTemplate, getResultSetType, getSql, isCompiled, isReturnGeneratedKeys, isUpdatableResults, setDataSource, setFetchSize, setGeneratedKeysColumnNames, setJdbcTemplate, setMaxRows, setResultSetType, setReturnGeneratedKeys, setSql, setTypes, setUpdatableResults, validateParameters

 

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

 

Field Detail

DEFAULT_BATCH_SIZE

public static int DEFAULT_BATCH_SIZE

Default number of inserts to accumulate before commiting a batch (5000).

Constructor Detail

BatchSqlUpdate

public BatchSqlUpdate()

Constructor to allow use as a JavaBean. DataSource and SQL must be supplied before compilation and use.

See Also:

RdbmsOperation.setDataSource(javax.sql.DataSource), RdbmsOperation.setSql(java.lang.String)

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BatchSqlUpdate

public BatchSqlUpdate(DataSource ds,
                      String sql)

Construct an update object with a given DataSource and SQL.

Parameters:

ds - DataSource to use to obtain connections

sql - SQL statement to execute

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BatchSqlUpdate

public BatchSqlUpdate(DataSource ds,
                      String sql,
                      int[] types)

Construct an update object with a given DataSource, SQL and anonymous parameters.

Parameters:

ds - DataSource to use to obtain connections

sql - SQL statement to execute

types - SQL types of the parameters, as defined in the java.sql.Types class

See Also:

Types

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BatchSqlUpdate

public BatchSqlUpdate(DataSource ds,
                      String sql,
                      int[] types,
                      int batchSize)

Construct an update object with a given DataSource, SQL, anonymous parameters and specifying the maximum number of rows that may be affected.

Parameters:

ds - DataSource to use to obtain connections

sql - SQL statement to execute

types - SQL types of the parameters, as defined in the java.sql.Types class

batchSize - the number of statements that will trigger an automatic intermediate flush

See Also:

Types

Method Detail

setBatchSize

public void setBatchSize(int batchSize)

Set the number of statements that will trigger an automatic intermediate flush. update calls or the given statement parameters will be queued until the batch size is met, at which point it will empty the queue and execute the batch.

You can also flush already queued statements with an explicit flush call. Note that you need to this after queueing all parameters to guarantee that all statements have been flushed.

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setTrackRowsAffected

public void setTrackRowsAffected(boolean trackRowsAffected)

Set whether to track the rows affected by batch updates performed by this operation object.

Default is "true". Turn this off to save the memory needed for the list of row counts.

See Also:

getRowsAffected()

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supportsLobParameters

protected boolean supportsLobParameters()

BatchSqlUpdate does not support BLOB or CLOB parameters.

Overrides:

supportsLobParameters in class RdbmsOperation

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update

public int update(Object[] params)
           throws DataAccessException

Overridden version of update that adds the given statement parameters to the queue rather than executing them immediately. All other update methods of the SqlUpdate base class go through this method and will thus behave similarly.

You need to call flush to actually execute the batch. If the specified batch size is reached, an implicit flush will happen; you still need to finally call flush to flush all statements.

Overrides:

update in class SqlUpdate

Parameters:

params - array of parameter objects

Returns:

the number of rows affected by the update (always -1, meaning "not applicable", as the statement is not actually executed by this method)

Throws:

DataAccessException

See Also:

flush()

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flush

public int[] flush()

Trigger any queued update operations to be added as a final batch.

Returns:

an array of the number of rows affected by each statement

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getQueueCount

public int getQueueCount()

Return the current number of statements or statement parameters in the queue.

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getExecutionCount

public int getExecutionCount()

Return the number of already executed statements.

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getRowsAffected

public int[] getRowsAffected()

Return the number of affected rows for all already executed statements. Accumulates all of flush's return values until reset is invoked.

Returns:

an array of the number of rows affected by each statement

See Also:

reset()

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reset

public void reset()

Reset the statement parameter queue, the rows affected cache, and the execution count.

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