程序包 com.mysql.cj.jdbc

类 BlobFromLocator

java.lang.Object

com.mysql.cj.jdbc.BlobFromLocator

所有已实现的接口:

Blob

public class BlobFromLocator
extends Object
implements Blob

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
BlobFromLocator(ResultSetImpl creatorResultSetToSet, int blobColumnIndex, ExceptionInterceptor exceptionInterceptor)	Creates an updatable BLOB that can update in-place

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	truncate(long length)

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

BlobFromLocator

public BlobFromLocator(ResultSetImpl creatorResultSetToSet,
                       int blobColumnIndex,
                       ExceptionInterceptor exceptionInterceptor)
                throws SQLException

Creates an updatable BLOB that can update in-place

参数:

creatorResultSetToSet - result set

blobColumnIndex - column index

exceptionInterceptor - exception interceptor

抛出:

SQLException - if an error occurs

方法详细资料

setBinaryStream

public OutputStream setBinaryStream(long indexToWriteAt)
                             throws SQLException

指定者:

setBinaryStream 在接口中 Blob

抛出:

SQLException

getBinaryStream

public InputStream getBinaryStream()
                            throws SQLException

指定者:

getBinaryStream 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

setBytes

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

指定者:

setBytes 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(Blob pattern,
                     long start)
              throws SQLException

指定者:

position 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

truncate

public void truncate(long length)
              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