Package org.postgresql.core.v3

Class CopyDualImpl

java.lang.Object

org.postgresql.core.v3.CopyOperationImpl

org.postgresql.core.v3.CopyDualImpl

All Implemented Interfaces:

CopyDual, CopyIn, CopyOperation, CopyOut

public class CopyDualImpl
extends CopyOperationImpl
implements CopyDual

Field Summary

Fields

Modifier and Type	Field	Description
private java.util.Queue<byte[]>	received

Fields inherited from class org.postgresql.core.v3.CopyOperationImpl

fieldFormats, handledRowCount, queryExecutor, rowFormat

Constructor Summary

Constructors

Constructor	Description
CopyDualImpl()

Method Summary

Modifier and Type	Method	Description
long	endCopy()	Finishes copy operation successfully.
void	flushCopy()	Force any buffered output to be sent over the network to the backend.
void	handleCommandStatus(java.lang.String status)
protected void	handleCopydata(byte[] data)	Consume received copy data.
byte[]	readFromCopy()	Blocks wait for a row of data to be received from server on an active copy operation.
byte[]	readFromCopy(boolean block)	Wait for a row of data to be received from server on an active copy operation.
void	writeToCopy(byte[] data, int off, int siz)	Writes specified part of given byte array to an open and writable copy operation.
void	writeToCopy(ByteStreamWriter from)	Writes a ByteStreamWriter to an open and writable copy operation.

Methods inherited from class org.postgresql.core.v3.CopyOperationImpl

cancelCopy, getFieldCount, getFieldFormat, getFormat, getHandledRowCount, getQueryExecutor, init, isActive

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.postgresql.copy.CopyOperation

cancelCopy, getFieldCount, getFieldFormat, getFormat, getHandledRowCount, isActive

Field Detail

received

private final java.util.Queue<byte[]> received

Constructor Detail

CopyDualImpl

public CopyDualImpl()

Method Detail

writeToCopy

public void writeToCopy(byte[] data,
                        int off,
                        int siz)
                 throws java.sql.SQLException

Description copied from interface: CopyIn

Writes specified part of given byte array to an open and writable copy operation.

Specified by:

writeToCopy in interface CopyIn

Parameters:

data - array of bytes to write

off - offset of first byte to write (normally zero)

siz - number of bytes to write (normally buf.length)

Throws:

java.sql.SQLException - if the operation fails

writeToCopy

public void writeToCopy(ByteStreamWriter from)
                 throws java.sql.SQLException

Description copied from interface: CopyIn

Writes a ByteStreamWriter to an open and writable copy operation.

Specified by:

writeToCopy in interface CopyIn

Parameters:

from - the source of bytes, e.g. a ByteBufferByteStreamWriter

Throws:

java.sql.SQLException - if the operation fails

flushCopy

public void flushCopy()
               throws java.sql.SQLException

Description copied from interface: CopyIn

Force any buffered output to be sent over the network to the backend. In general this is a useless operation as it will get pushed over in due time or when endCopy is called. Some specific modified server versions (Truviso) want this data sooner. If you are unsure if you need to use this method, don't.

Specified by:

flushCopy in interface CopyIn

Throws:

java.sql.SQLException - if the operation fails.

endCopy

public long endCopy()
             throws java.sql.SQLException

Description copied from interface: CopyIn

Finishes copy operation successfully.

Specified by:

endCopy in interface CopyIn

Returns:

number of updated rows for server 8.2 or newer (see getHandledRowCount())

Throws:

java.sql.SQLException - if the operation fails.

readFromCopy

public byte[] readFromCopy()
                    throws java.sql.SQLException

Description copied from interface: CopyOut

Blocks wait for a row of data to be received from server on an active copy operation.

Specified by:

readFromCopy in interface CopyOut

Returns:

byte array received from server, null if server complete copy operation

Throws:

java.sql.SQLException - if something goes wrong for example socket timeout

readFromCopy

public byte[] readFromCopy(boolean block)
                    throws java.sql.SQLException

Description copied from interface: CopyOut

Wait for a row of data to be received from server on an active copy operation.

Specified by:

readFromCopy in interface CopyOut

Parameters:

block - true if need wait data from server otherwise false and will read pending message from server

Returns:

byte array received from server, if pending message from server absent and use no blocking mode return null

Throws:

java.sql.SQLException - if something goes wrong for example socket timeout

handleCommandStatus

public void handleCommandStatus(java.lang.String status)
                         throws PSQLException

Overrides:

handleCommandStatus in class CopyOperationImpl

Throws:

PSQLException

handleCopydata

protected void handleCopydata(byte[] data)

Description copied from class: CopyOperationImpl

Consume received copy data.

Specified by:

handleCopydata in class CopyOperationImpl

Parameters:

data - data that was receive by copy protocol