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Spring Framework example source code file (LobCreator.java)

This example Spring Framework source code file (LobCreator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Spring Framework tags/keywords

inputstream, inputstream, io, jdbc, lobcreator, preparedstatement, preparedstatement, reader, reader, sql, sqlexception, sqlexception, string

The Spring Framework LobCreator.java source code

/*
 * Copyright 2002-2008 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.jdbc.support.lob;

import java.io.InputStream;
import java.io.Reader;
import java.sql.PreparedStatement;
import java.sql.SQLException;

/**
 * Interface that abstracts potentially database-specific creation of large binary
 * fields and large text fields. Does not work with <code>java.sql.Blob
 * and <code>java.sql.Clob instances in the API, as some JDBC drivers
 * do not support these types as such.
 *
 * <p>The LOB creation part is where {@link LobHandler} implementations usually
 * differ. Possible strategies include usage of
 * <code>PreparedStatement.setBinaryStream/setCharacterStream but also
 * <code>PreparedStatement.setBlob/setClob with either a stream argument
 * (requires JDBC 4.0) or <code>java.sql.Blob/Clob wrapper objects.
 *
 * <p>A LobCreator represents a session for creating BLOBs: It is not
 * thread-safe and needs to be instantiated for each statement execution or for
 * each transaction. Each LobCreator needs to be closed after completion.
 *
 * <p>For convenient working with a PreparedStatement and a LobCreator,
 * consider using {@link org.springframework.jdbc.core.JdbcTemplate} with an
 *{@link org.springframework.jdbc.core.support.AbstractLobCreatingPreparedStatementCallback}
 * implementation. See the latter's javadoc for details.
 *
 * @author Juergen Hoeller
 * @since 04.12.2003
 * @see #close()
 * @see LobHandler#getLobCreator()
 * @see DefaultLobHandler.DefaultLobCreator
 * @see OracleLobHandler.OracleLobCreator
 * @see java.sql.PreparedStatement#setBlob
 * @see java.sql.PreparedStatement#setClob
 * @see java.sql.PreparedStatement#setBytes
 * @see java.sql.PreparedStatement#setBinaryStream
 * @see java.sql.PreparedStatement#setString
 * @see java.sql.PreparedStatement#setAsciiStream
 * @see java.sql.PreparedStatement#setCharacterStream
 */
public interface LobCreator {

	/**
	 * Set the given content as bytes on the given statement, using the given
	 * parameter index. Might simply invoke <code>PreparedStatement.setBytes
	 * or create a Blob instance for it, depending on the database and driver.
	 * @param ps the PreparedStatement to the set the content on
	 * @param paramIndex the parameter index to use
	 * @param content the content as byte array, or <code>null for SQL NULL
	 * @throws SQLException if thrown by JDBC methods
	 * @see java.sql.PreparedStatement#setBytes
	 */
	void setBlobAsBytes(PreparedStatement ps, int paramIndex, byte[] content)
	    throws SQLException;

	/**
	 * Set the given content as binary stream on the given statement, using the given
	 * parameter index. Might simply invoke <code>PreparedStatement.setBinaryStream
	 * or create a Blob instance for it, depending on the database and driver.
	 * @param ps the PreparedStatement to the set the content on
	 * @param paramIndex the parameter index to use
	 * @param contentStream the content as binary stream, or <code>null for SQL NULL
	 * @throws SQLException if thrown by JDBC methods
	 * @see java.sql.PreparedStatement#setBinaryStream
	 */
	void setBlobAsBinaryStream(
			PreparedStatement ps, int paramIndex, InputStream contentStream, int contentLength)
	    throws SQLException;

	/**
	 * Set the given content as String on the given statement, using the given
	 * parameter index. Might simply invoke <code>PreparedStatement.setString
	 * or create a Clob instance for it, depending on the database and driver.
	 * @param ps the PreparedStatement to the set the content on
	 * @param paramIndex the parameter index to use
	 * @param content the content as String, or <code>null for SQL NULL
	 * @throws SQLException if thrown by JDBC methods
	 * @see java.sql.PreparedStatement#setBytes
	 */
	void setClobAsString(PreparedStatement ps, int paramIndex, String content)
	    throws SQLException;

	/**
	 * Set the given content as ASCII stream on the given statement, using the given
	 * parameter index. Might simply invoke <code>PreparedStatement.setAsciiStream
	 * or create a Clob instance for it, depending on the database and driver.
	 * @param ps the PreparedStatement to the set the content on
	 * @param paramIndex the parameter index to use
	 * @param asciiStream the content as ASCII stream, or <code>null for SQL NULL
	 * @throws SQLException if thrown by JDBC methods
	 * @see java.sql.PreparedStatement#setAsciiStream
	 */
	void setClobAsAsciiStream(
			PreparedStatement ps, int paramIndex, InputStream asciiStream, int contentLength)
	    throws SQLException;

	/**
	 * Set the given content as character stream on the given statement, using the given
	 * parameter index. Might simply invoke <code>PreparedStatement.setCharacterStream
	 * or create a Clob instance for it, depending on the database and driver.
	 * @param ps the PreparedStatement to the set the content on
	 * @param paramIndex the parameter index to use
	 * @param characterStream the content as character stream, or <code>null for SQL NULL
	 * @throws SQLException if thrown by JDBC methods
	 * @see java.sql.PreparedStatement#setCharacterStream
	 */
	void setClobAsCharacterStream(
			PreparedStatement ps, int paramIndex, Reader characterStream, int contentLength)
	    throws SQLException;

	/**
	 * Close this LobCreator session and free its temporarily created BLOBs and CLOBs.
	 * Will not need to do anything if using PreparedStatement's standard methods,
	 * but might be necessary to free database resources if using proprietary means.
	 * <p>NOTE: Needs to be invoked after the involved PreparedStatements have
	 * been executed or the affected O/R mapping sessions have been flushed.
	 * Otherwise, the database resources for the temporary BLOBs might stay allocated.
	 */
	void close();

}

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