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	/*
	* Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package java.sql;

	import java.io.Reader;

	/**
	* The mapping in the Java™ programming language
	* for the SQL {@code CLOB} type.
	* An SQL {@code CLOB} is a built-in type
	* that stores a Character Large Object as a column value in a row of
	* a database table.
	* By default drivers implement a {@code Clob} object using an SQL
	* {@code locator(CLOB)}, which means that a {@code Clob} object
	* contains a logical pointer to the SQL {@code CLOB} data rather than
	* the data itself. A {@code Clob} object is valid for the duration
	* of the transaction in which it was created.
	* <P>The {@code Clob} interface provides methods for getting the
	* length of an SQL {@code CLOB} (Character Large Object) value,
	* for materializing a {@code CLOB} value on the client, and for
	* searching for a substring or {@code CLOB} object within a
	* {@code CLOB} value.
	* Methods in the interfaces {@link ResultSet},
	* {@link CallableStatement}, and {@link PreparedStatement}, such as
	* {@code getClob} and {@code setClob} allow a programmer to
	* access an SQL {@code CLOB} value. In addition, this interface
	* has methods for updating a {@code CLOB} value.
	* <p>
	* All methods on the {@code Clob} interface must be
	* fully implemented if the JDBC driver supports the data type.
	*
	* @since 1.2
	*/

	public interface Clob {

	/**
	* Retrieves the number of characters
	* in the {@code CLOB} value
	* designated by this {@code Clob} object.
	*
	* @return length of the {@code CLOB} in characters
	* @exception SQLException if there is an error accessing the
	* length of the {@code CLOB} value
	* @exception SQLFeatureNotSupportedException if the JDBC driver
	* does not support this method
	* @since 1.2
	*/
	long length() throws SQLException;

	/**
	* Retrieves a copy of the specified substring
	* in the {@code CLOB} value
	* designated by this {@code Clob} object.
	* The substring begins at position
	* {@code pos} and has up to {@code length} consecutive
	* characters.
	*
	* @param pos the first character of the substring to be extracted.
	* The first character is at position 1.
	* @param length the number of consecutive characters to be copied;
	* the value for length must be 0 or greater
	* @return a {@code String} that is the specified substring in
	* the {@code CLOB} value designated by this {@code Clob} object
	* @exception SQLException if there is an error accessing the
	* {@code CLOB} value; if pos is less than 1 or length is
	* less than 0
	* @exception SQLFeatureNotSupportedException if the JDBC driver
	* does not support this method
	* @since 1.2
	*/
	String getSubString(long pos, int length) throws SQLException;

	/**
	* Retrieves the {@code CLOB} value designated by this {@code Clob}
	* object as a {@code java.io.Reader} object (or as a stream of
	* characters).
	*
	* @return a {@code java.io.Reader} object containing the
	* {@code CLOB} data
	* @exception SQLException if there is an error accessing the
	* {@code CLOB} value
	* @exception SQLFeatureNotSupportedException if the JDBC driver
	* does not support this method
	* @see #setCharacterStream
	* @since 1.2
	*/
	java.io.Reader getCharacterStream() throws SQLException;

	/**
	* Retrieves the {@code CLOB} value designated by this {@code Clob}
	* object as an ascii stream.
	*
	* @return a {@code java.io.InputStream} object containing the
	* {@code CLOB} data
	* @exception SQLException if there is an error accessing the
	* {@code CLOB} value
	* @exception SQLFeatureNotSupportedException if the JDBC driver
	* does not support this method
	* @see #setAsciiStream
	* @since 1.2
	*/
	java.io.InputStream getAsciiStream() throws SQLException;

	/**
	* Retrieves the character position at which the specified substring
	* {@code searchstr} appears in the SQL {@code CLOB} value
	* represented by this {@code Clob} object. The search
	* begins at position {@code start}.
	*
	* @param searchstr the substring for which to search
	* @param start the position at which to begin searching;
	* the first position is 1
	* @return the position at which the substring appears or -1 if it is not
	* present; the first position is 1
	* @exception SQLException if there is an error accessing the
	* {@code CLOB} value or if pos is less than 1
	* @exception SQLFeatureNotSupportedException if the JDBC driver
	* does not support this method
	* @since 1.2
	*/
	long position(String searchstr, long start) throws SQLException;

	/**
	* Retrieves the character position at which the specified
	* {@code Clob} object {@code searchstr} appears in this
	* {@code Clob} object. The search begins at position
	* {@code start}.
	*
	* @param searchstr the {@code Clob} object for which to search
	* @param start the position at which to begin searching; the first
	* position is 1
	* @return the position at which the {@code Clob} object appears
	* or -1 if it is not present; the first position is 1
	* @exception SQLException if there is an error accessing the
	* {@code CLOB} value or if start is less than 1
	* @exception SQLFeatureNotSupportedException if the JDBC driver
	* does not support this method
	* @since 1.2
	*/
	long position(Clob searchstr, long start) throws SQLException;

	//---------------------------- jdbc 3.0 -----------------------------------

	/**
	* Writes the given Java {@code String} to the {@code CLOB}
	* value that this {@code Clob} object designates at the position
	* {@code pos}. The string will overwrite the existing characters
	* in the {@code Clob} object starting at the position
	* {@code pos}. If the end of the {@code Clob} value is reached
	* while writing the given string, then the length of the {@code Clob}
	* value will be increased to accommodate the extra characters.
	* <p>
	* <b>Note:</b> If the value specified for {@code pos}
	* is greater than the length+1 of the {@code CLOB} value then the
	* behavior is undefined. Some JDBC drivers may throw an
	* {@code SQLException} while other drivers may support this
	* operation.
	*
	* @param pos the position at which to start writing to the {@code CLOB}
	* value that this {@code Clob} object represents;
	* the first position is 1.
	* @param str the string to be written to the {@code CLOB}
	* value that this {@code Clob} designates
	* @return the number of characters written
	* @exception SQLException if there is an error accessing the
	* {@code CLOB} value or if pos is less than 1
	*
	* @exception SQLFeatureNotSupportedException if the JDBC driver
	* does not support this method
	* @since 1.4
	*/
	int setString(long pos, String str) throws SQLException;

	/**
	* Writes {@code len} characters of {@code str}, starting
	* at character {@code offset}, to the {@code CLOB} value
	* that this {@code Clob} represents.
	* The string will overwrite the existing characters
	* in the {@code Clob} object starting at the position
	* {@code pos}. If the end of the {@code Clob} value is reached
	* while writing the given string, then the length of the {@code Clob}
	* value will be increased to accommodate the extra characters.
	* <p>
	* <b>Note:</b> If the value specified for {@code pos}
	* is greater than the length+1 of the {@code CLOB} value then the
	* behavior is undefined. Some JDBC drivers may throw an
	* {@code SQLException} while other drivers may support this
	* operation.
	*
	* @param pos the position at which to start writing to this
	* {@code CLOB} object; The first position is 1
	* @param str the string to be written to the {@code CLOB}
	* value that this {@code Clob} object represents
	* @param offset the offset into {@code str} to start reading
	* the characters to be written
	* @param len the number of characters to be written
	* @return the number of characters written
	* @exception SQLException if there is an error accessing the
	* {@code CLOB} value or if pos is less than 1
	*
	* @exception SQLFeatureNotSupportedException if the JDBC driver
	* does not support this method
	* @since 1.4
	*/
	int setString(long pos, String str, int offset, int len) throws SQLException;

	/**
	* Retrieves a stream to be used to write Ascii characters to the
	* {@code CLOB} value that this {@code Clob} object represents,
	* starting at position {@code pos}. Characters written to the stream
	* will overwrite the existing characters
	* in the {@code Clob} object starting at the position
	* {@code pos}. If the end of the {@code Clob} value is reached
	* while writing characters to the stream, then the length of the {@code Clob}
	* value will be increased to accommodate the extra characters.
	* <p>
	* <b>Note:</b> If the value specified for {@code pos}
	* is greater than the length+1 of the {@code CLOB} value then the
	* behavior is undefined. Some JDBC drivers may throw an
	* {@code SQLException} while other drivers may support this
	* operation.
	*
	* @param pos the position at which to start writing to this
	* {@code CLOB} object; The first position is 1
	* @return the stream to which ASCII encoded characters can be written
	* @exception SQLException if there is an error accessing the
	* {@code CLOB} value or if pos is less than 1
	* @exception SQLFeatureNotSupportedException if the JDBC driver
	* does not support this method
	* @see #getAsciiStream
	*
	* @since 1.4
	*/
	java.io.OutputStream setAsciiStream(long pos) throws SQLException;

	/**
	* Retrieves a stream to be used to write a stream of Unicode characters
	* to the {@code CLOB} value that this {@code Clob} object
	* represents, at position {@code pos}. Characters written to the stream
	* will overwrite the existing characters
	* in the {@code Clob} object starting at the position
	* {@code pos}. If the end of the {@code Clob} value is reached
	* while writing characters to the stream, then the length of the {@code Clob}
	* value will be increased to accommodate the extra characters.
	* <p>
	* <b>Note:</b> If the value specified for {@code pos}
	* is greater than the length+1 of the {@code CLOB} value then the
	* behavior is undefined. Some JDBC drivers may throw an
	* {@code SQLException} while other drivers may support this
	* operation.
	*
	* @param pos the position at which to start writing to the
	* {@code CLOB} value; The first position is 1
	*
	* @return a stream to which Unicode encoded characters can be written
	* @exception SQLException if there is an error accessing the
	* {@code CLOB} value or if pos is less than 1
	* @exception SQLFeatureNotSupportedException if the JDBC driver
	* does not support this method
	* @see #getCharacterStream
	*
	* @since 1.4
	*/
	java.io.Writer setCharacterStream(long pos) throws SQLException;

	/**
	* Truncates the {@code CLOB} value that this {@code Clob}
	* designates to have a length of {@code len}
	* characters.
	* <p>
	* <b>Note:</b> If the value specified for {@code pos}
	* is greater than the length+1 of the {@code CLOB} value then the
	* behavior is undefined. Some JDBC drivers may throw an
	* {@code SQLException} while other drivers may support this
	* operation.
	*
	* @param len the length, in characters, to which the {@code CLOB} value
	* should be truncated
	* @exception SQLException if there is an error accessing the
	* {@code CLOB} 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 releases the resources that the {@code Clob} object
	* holds. The object is invalid once the {@code free} method
	* is called.
	* <p>
	* After {@code free} has been called, any attempt to invoke a
	* method other than {@code free} will result in a {@code SQLException}
	* being thrown. If {@code free} is called multiple times, the subsequent
	* calls to {@code free} are treated as a no-op.
	*
	* @throws SQLException if an error occurs releasing
	* the Clob's resources
	*
	* @exception SQLFeatureNotSupportedException if the JDBC driver
	* does not support this method
	* @since 1.6
	*/
	void free() throws SQLException;

	/**
	* Returns a {@code Reader} object that contains
	* a partial {@code Clob} value, starting with the character
	* specified by pos, which is length characters in length.
	*
	* @param pos the offset to the first character of the partial value to
	* be retrieved. The first character in the Clob is at position 1.
	* @param length the length in characters of the partial value to be retrieved.
	* @return {@code Reader} through which
	* the partial {@code Clob} value can be read.
	* @throws SQLException if pos is less than 1;
	* or if pos is greater than the number of characters
	* in the {@code Clob};
	* or if pos + length is greater than the number of
	* characters in the {@code Clob}
	*
	* @exception SQLFeatureNotSupportedException if the JDBC driver
	* does not support this method
	* @since 1.6
	*/
	Reader getCharacterStream(long pos, long length) throws SQLException;

	}

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