程序包 com.mysql.cj.protocol.a.result

类 BinaryBufferRow

java.lang.Object

com.mysql.cj.protocol.result.AbstractResultsetRow

com.mysql.cj.protocol.a.result.AbstractBufferRow

com.mysql.cj.protocol.a.result.BinaryBufferRow

所有已实现的接口:

ProtocolEntity, ResultsetRow, Row

public class BinaryBufferRow
extends AbstractBufferRow

A BufferRow implementation that holds one row packet from a server-side prepared statement (which is re-used by the driver, and thus saves memory allocations), and tries when possible to avoid allocations to break out the results as individual byte[]s. Rows from a server-side prepared statement are encoded differently, so we have different ways of finding where each column is, and unpacking them. (this isn't possible when doing things like reading floating point values).

字段概要

从类继承的字段 com.mysql.cj.protocol.a.result.AbstractBufferRow

homePosition, lastRequestedIndex, lastRequestedPos, rowFromServer

从类继承的字段 com.mysql.cj.protocol.result.AbstractResultsetRow

exceptionInterceptor, metadata, valueDecoder, wasNull

构造器概要

构造器

构造器	说明
BinaryBufferRow(NativePacketPayload buf, ColumnDefinition cd, ExceptionInterceptor exceptionInterceptor, ValueDecoder valueDecoder)

方法概要

修饰符和类型	方法	说明
protected int	findAndSeekToOffset(int index)
byte[]	getBytes(int index)	Returns the value at the given column as a byte array.
boolean	getNull(int columnIndex)	Check whether a column is NULL and update the 'wasNull' status.
<T> T	getValue(int columnIndex, ValueFactory<T> vf)	Implementation of getValue() based on the underlying Buffer object.
boolean	isBinaryEncoded()
void	setBytes(int columnIndex, byte[] value)	Sets the given byte array as a raw column value (only works currently with ByteArrayRow).
Row	setMetadata(ColumnDefinition f)	Set metadata to enable getValue functionality.

从类继承的方法 com.mysql.cj.protocol.result.AbstractResultsetRow

getValueFromBytes, wasNull

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

BinaryBufferRow

public BinaryBufferRow(NativePacketPayload buf,
                       ColumnDefinition cd,
                       ExceptionInterceptor exceptionInterceptor,
                       ValueDecoder valueDecoder)

方法详细资料

isBinaryEncoded

public boolean isBinaryEncoded()

findAndSeekToOffset

protected int findAndSeekToOffset(int index)

getBytes

public byte[] getBytes(int index)

从接口复制的说明: Row

Returns the value at the given column as a byte array. The bytes represent the raw values returned by the server.

参数:

index - index of column (starting at 0) to return from.

返回:

the value for the given column; if the value is SQL NULL, the value returned is null

getNull

public boolean getNull(int columnIndex)

Check whether a column is NULL and update the 'wasNull' status.

参数:

columnIndex - of the column value (starting at 0) to check.

返回:

true if the column value is NULL, false if not.

setMetadata

public Row setMetadata(ColumnDefinition f)

从接口复制的说明: Row

Set metadata to enable getValue functionality.

指定者:

setMetadata 在接口中 Row

覆盖:

setMetadata 在类中 AbstractResultsetRow

参数:

f - ColumnDefinition

返回:

Row

getValue

public <T> T getValue(int columnIndex,
                      ValueFactory<T> vf)

Implementation of getValue() based on the underlying Buffer object. Delegate to superclass for decoding.

类型参数:

T - type to decode to

参数:

columnIndex - index of column to retrieve value from (0-indexed, not JDBC 1-indexed)

vf - value factory used to create the return value after decoding

返回:

The return value from the value factory

setBytes

public void setBytes(int columnIndex,
                     byte[] value)

从接口复制的说明: Row

Sets the given byte array as a raw column value (only works currently with ByteArrayRow).

参数:

columnIndex - index of the column (starting at 0) to set to.

value - the (raw) value to set