程序包 com.mysql.cj.jdbc

类 Blob

java.lang.Object

com.mysql.cj.jdbc.Blob

所有已实现的接口:

OutputStreamWatcher, Blob

public class Blob
extends Object
implements Blob, OutputStreamWatcher

The representation (mapping) in the JavaTM programming language of an SQL BLOB value. An SQL BLOB is a built-in type that stores a Binary Large Object as a column value in a row of a database table. The driver implements Blob using an SQL locator(BLOB), which means that a Blob object contains a logical pointer to the SQL BLOB data rather than the data itself. A Blob object is valid for the duration of the transaction in which is was created. Methods in the interfaces ResultSet, CallableStatement, and PreparedStatement, such as getBlob and setBlob allow a programmer to access an SQL BLOB value. The Blob interface provides methods for getting the length of an SQL BLOB (Binary Large Object) value, for materializing a BLOB value on the client, and for determining the position of a pattern of bytes within a BLOB value. This class is new in the JDBC 2.0 API.

构造器概要

构造器

构造器	说明
Blob(byte[] data, ExceptionInterceptor exceptionInterceptor)	Creates a BLOB encapsulating the given binary data

方法概要

修饰符和类型	方法	说明
void	free()
InputStream	getBinaryStream()
InputStream	getBinaryStream(long pos, long length)
byte[]	getBytes(long pos, int length)
long	length()
long	position(byte[] pattern, long start)
long	position(Blob pattern, long start)
OutputStream	setBinaryStream(long indexToWriteAt)
int	setBytes(long writeAt, byte[] bytes)
int	setBytes(long writeAt, byte[] bytes, int offset, int length)
void	streamClosed(byte[] byteData)
void	streamClosed(WatchableStream out)	Called when the OutputStream being watched has .close() called
void	truncate(long len)

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

Blob

public Blob(byte[] data,
            ExceptionInterceptor exceptionInterceptor)

Creates a BLOB encapsulating the given binary data

参数:

data - data to fill the Blob

exceptionInterceptor - exception interceptor

方法详细资料

getBinaryStream

public InputStream getBinaryStream()
                            throws SQLException

指定者:

getBinaryStream 在接口中 Blob

抛出:

SQLException

getBytes

public byte[] getBytes(long pos,
                       int length)
                throws SQLException

指定者:

getBytes 在接口中 Blob

抛出:

SQLException

length

public long length()
            throws SQLException

指定者:

length 在接口中 Blob

抛出:

SQLException

position

public long position(byte[] pattern,
                     long start)
              throws SQLException

指定者:

position 在接口中 Blob

抛出:

SQLException

position

public long position(Blob pattern,
                     long start)
              throws SQLException

指定者:

position 在接口中 Blob

抛出:

SQLException

setBinaryStream

public OutputStream setBinaryStream(long indexToWriteAt)
                             throws SQLException

指定者:

setBinaryStream 在接口中 Blob

抛出:

SQLException

setBytes

public int setBytes(long writeAt,
                    byte[] bytes)
             throws SQLException

指定者:

setBytes 在接口中 Blob

抛出:

SQLException

setBytes

public int setBytes(long writeAt,
                    byte[] bytes,
                    int offset,
                    int length)
             throws SQLException

指定者:

setBytes 在接口中 Blob

抛出:

SQLException

streamClosed

public void streamClosed(byte[] byteData)

streamClosed

public void streamClosed(WatchableStream out)

从接口复制的说明: OutputStreamWatcher

Called when the OutputStream being watched has .close() called

指定者:

streamClosed 在接口中 OutputStreamWatcher

参数:

out - WatchableStream

truncate

public void truncate(long len)
              throws SQLException

指定者:

truncate 在接口中 Blob

抛出:

SQLException

free

public void free()
          throws SQLException

指定者:

free 在接口中 Blob

抛出:

SQLException

getBinaryStream

public InputStream getBinaryStream(long pos,
                                   long length)
                            throws SQLException

指定者:

getBinaryStream 在接口中 Blob

抛出:

SQLException