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/* * @(#)Blob.java 1.34 06/08/12 * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ package java.sql; import java.io.InputStream; /** * The representation (mapping) in * the Java<sup><font size=-2>TM</font></sup> programming * language of an SQL * <code>BLOB</code> value. An SQL <code>BLOB</code> is a built-in type * that stores a Binary Large Object as a column value in a row of * a database table. By default drivers implement <code>Blob</code> using * an SQL <code>locator(BLOB)</code>, which means that a * <code>Blob</code> object contains a logical pointer to the * SQL <code>BLOB</code> data rather than the data itself. * A <code>Blob</code> object is valid for the duration of the * transaction in which is was created. * * <P>Methods in the interfaces {@link ResultSet}, * {@link CallableStatement}, and {@link PreparedStatement}, such as * <code>getBlob</code> and <code>setBlob</code> allow a programmer to * access an SQL <code>BLOB</code> value. * The <code>Blob</code> interface provides methods for getting the * length of an SQL <code>BLOB</code> (Binary Large Object) value, * for materializing a <code>BLOB</code> value on the client, and for * determining the position of a pattern of bytes within a * <code>BLOB</code> value. In addition, this interface has methods for updating * a <code>BLOB</code> value. * <p> * All methods on the <code>Blob</code> interface must be fully implemented if the * JDBC driver supports the data type. * * @since 1.2 */ public interface Blob { /** * Returns the number of bytes in the <code>BLOB</code> value * designated by this <code>Blob</code> object. * @return length of the <code>BLOB</code> in bytes * @exception SQLException if there is an error accessing the * length of the <code>BLOB</code> * @exception SQLFeatureNotSupportedException if the JDBC driver does not support * this method * @since 1.2 */ long length() throws SQLException; /** * Retrieves all or part of the <code>BLOB</code> * value that this <code>Blob</code> object represents, as an array of * bytes. This <code>byte</code> array contains up to <code>length</code> * consecutive bytes starting at position <code>pos</code>. * * @param pos the ordinal position of the first byte in the * <code>BLOB</code> value to be extracted; the first byte is at * position 1 * @param length the number of consecutive bytes to be copied; the value * for length must be 0 or greater * @return a byte array containing up to <code>length</code> * consecutive bytes from the <code>BLOB</code> value designated * by this <code>Blob</code> object, starting with the * byte at position <code>pos</code> * @exception SQLException if there is an error accessing the * <code>BLOB</code> value; if pos is less than 1 or length is * less than 0 * @exception SQLFeatureNotSupportedException if the JDBC driver does not support * this method * @see #setBytes * @since 1.2 */ byte[] getBytes(long pos, int length) throws SQLException; /** * Retrieves the <code>BLOB</code> value designated by this * <code>Blob</code> instance as a stream. * * @return a stream containing the <code>BLOB</code> data * @exception SQLException if there is an error accessing the * <code>BLOB</code> value * @exception SQLFeatureNotSupportedException if the JDBC driver does not support * this method * @see #setBinaryStream * @since 1.2 */ java.io.InputStream getBinaryStream () throws SQLException; /** * Retrieves the byte position at which the specified byte array * <code>pattern</code> begins within the <code>BLOB</code> * value that this <code>Blob</code> object represents. The * search for <code>pattern</code> begins at position * <code>start</code>. * * @param pattern the byte array for which to search * @param start the position at which to begin searching; the * first position is 1 * @return the position at which the pattern appears, else -1 * @exception SQLException if there is an error accessing the * <code>BLOB</code> or if start is less than 1 * @exception SQLFeatureNotSupportedException if the JDBC driver does not support * this method * @since 1.2 */ long position(byte pattern[], long start) throws SQLException; /** * Retrieves the byte position in the <code>BLOB</code> value * designated by this <code>Blob</code> object at which * <code>pattern</code> begins. The search begins at position * <code>start</code>. * * @param pattern the <code>Blob</code> object designating * the <code>BLOB</code> value for which to search * @param start the position in the <code>BLOB</code> value * at which to begin searching; the first position is 1 * @return the position at which the pattern begins, else -1 * @exception SQLException if there is an error accessing the * <code>BLOB</code> value or if start is less than 1 * @exception SQLFeatureNotSupportedException if the JDBC driver does not support * this method * @since 1.2 */ long position(Blob pattern, long start) throws SQLException; // -------------------------- JDBC 3.0 ----------------------------------- /** * Writes the given array of bytes to the <code>BLOB</code> value that * this <code>Blob</code> object represents, starting at position * <code>pos</code>, and returns the number of bytes written. * The array of bytes will overwrite the existing bytes * in the <code>Blob</code> object starting at the position * <code>pos</code>. If the end of the <code>Blob</code> value is reached * while writing the array of bytes, then the length of the <code>Blob</code> * value will be increased to accomodate the extra bytes. * <p> * <b>Note:</b> If the value specified for <code>pos</code> * is greater then the length+1 of the <code>BLOB</code> value then the * behavior is undefined. Some JDBC drivers may throw a * <code>SQLException</code> while other drivers may support this * operation. * * @param pos the position in the <code>BLOB</code> object at which * to start writing; the first position is 1 * @param bytes the array of bytes to be written to the <code>BLOB</code> * value that this <code>Blob</code> object represents * @return the number of bytes written * @exception SQLException if there is an error accessing the * <code>BLOB</code> value or if pos is less than 1 * @exception SQLFeatureNotSupportedException if the JDBC driver does not support * this method * @see #getBytes * @since 1.4 */ int setBytes(long pos, byte[] bytes) throws SQLException; /** * Writes all or part of the given <code>byte</code> array to the * <code>BLOB</code> value that this <code>Blob</code> object represents * and returns the number of bytes written. * Writing starts at position <code>pos</code> in the <code>BLOB</code> * value; <code>len</code> bytes from the given byte array are written. * The array of bytes will overwrite the existing bytes * in the <code>Blob</code> object starting at the position * <code>pos</code>. If the end of the <code>Blob</code> value is reached * while writing the array of bytes, then the length of the <code>Blob</code> * value will be increased to accomodate the extra bytes. * <p> * <b>Note:</b> If the value specified for <code>pos</code> * is greater then the length+1 of the <code>BLOB</code> value then the * behavior is undefined. Some JDBC drivers may throw a * <code>SQLException</code> while other drivers may support this * operation. * * @param pos the position in the <code>BLOB</code> object at which * to start writing; the first position is 1 * @param bytes the array of bytes to be written to this <code>BLOB</code> * object * @param offset the offset into the array <code>bytes</code> at which * to start reading the bytes to be set * @param len the number of bytes to be written to the <code>BLOB</code> * value from the array of bytes <code>bytes</code> * @return the number of bytes written * @exception SQLException if there is an error accessing the * <code>BLOB</code> value or if pos is less than 1 * @exception SQLFeatureNotSupportedException if the JDBC driver does not support * this method * @see #getBytes * @since 1.4 */ int setBytes(long pos, byte[] bytes, int offset, int len) throws SQLException; /** * Retrieves a stream that can be used to write to the <code>BLOB</code> * value that this <code>Blob</code> object represents. The stream begins * at position <code>pos</code>. * The bytes written to the stream will overwrite the existing bytes * in the <code>Blob</code> object starting at the position * <code>pos</code>. If the end of the <code>Blob</code> value is reached * while writing to the stream, then the length of the <code>Blob</code> * value will be increased to accomodate the extra bytes. * <p> * <b>Note:</b> If the value specified for <code>pos</code> * is greater then the length+1 of the <code>BLOB</code> value then the * behavior is undefined. Some JDBC drivers may throw a * <code>SQLException</code> while other drivers may support this * operation. * * @param pos the position in the <code>BLOB</code> value at which * to start writing; the first position is 1 * @return a <code>java.io.OutputStream</code> object to which data can * be written * @exception SQLException if there is an error accessing the * <code>BLOB</code> value or if pos is less than 1 * @exception SQLFeatureNotSupportedException if the JDBC driver does not support * this method * @see #getBinaryStream * @since 1.4 */ java.io.OutputStream setBinaryStream(long pos) throws SQLException; /** * Truncates the <code>BLOB</code> value that this <code>Blob</code> * object represents to be <code>len</code> bytes in length. * <p> * <b>Note:</b> If the value specified for <code>pos</code> * is greater then the length+1 of the <code>BLOB</code> value then the * behavior is undefined. Some JDBC drivers may throw a * <code>SQLException</code> while other drivers may support this * operation. * * @param len the length, in bytes, to which the <code>BLOB</code> value * that this <code>Blob</code> object represents should be truncated * @exception SQLException if there is an error accessing the * <code>BLOB</code> value or if len is less than 0 * @exception SQLFeatureNotSupportedException if the JDBC driver does not support * this method * @since 1.4 */ void truncate(long len) throws SQLException; /** * This method frees the <code>Blob</code> object and releases the resources that * it holds. The object is invalid once the <code>free</code> * method is called. *<p> * After <code>free</code> has been called, any attempt to invoke a * method other than <code>free</code> will result in a <code>SQLException</code> * being thrown. If <code>free</code> is called multiple times, the subsequent * calls to <code>free</code> are treated as a no-op. *<p> * * @throws SQLException if an error occurs releasing * the Blob's resources * @exception SQLFeatureNotSupportedException if the JDBC driver does not support * this method * @since 1.6 */ void free() throws SQLException; /** * Returns an <code>InputStream</code> object that contains a partial <code>Blob</code> value, * starting with the byte specified by pos, which is length bytes in length. * * @param pos the offset to the first byte of the partial value to be retrieved. * The first byte in the <code>Blob</code> is at position 1 * @param length the length in bytes of the partial value to be retrieved * @return <code>InputStream</code> through which the partial <code>Blob</code> value can be read. * @throws SQLException if pos is less than 1 or if pos is greater than the number of bytes * in the <code>Blob</code> or if pos + length is greater than the number of bytes * in the <code>Blob</code> * * @exception SQLFeatureNotSupportedException if the JDBC driver does not support * this method * @since 1.6 */ InputStream getBinaryStream(long pos, long length) throws SQLException; }