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AbstractLobCreatingPreparedStatementCallback.java
Upload User: jiancairen
Upload Date: 2007-08-27
Package Size: 26458k
Code Size: 3k
Category:
Java Develop
Development Platform:
Java
- /*
- * Copyright 2002-2004 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.core.support;
- import java.sql.PreparedStatement;
- import java.sql.SQLException;
- import org.springframework.dao.DataAccessException;
- import org.springframework.jdbc.core.PreparedStatementCallback;
- import org.springframework.jdbc.support.lob.LobCreator;
- import org.springframework.jdbc.support.lob.LobHandler;
- /**
- * Abstract PreparedStatementCallback implementation that manages a LobCreator.
- * Typically used as inner class, with access to surrounding method arguments.
- *
- * <p>Delegates to the <code>setValues</code> template method for setting values
- * on the PreparedStatement, using a given LobCreator for BLOB/CLOB arguments.
- *
- * <p>A usage example with JdbcTemplate:
- *
- * <pre>
- * JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource); // reusable object
- * LobHandler lobHandler = new DefaultLobHandler(); // reusable object
- *
- * jdbcTemplate.execute(
- * "INSERT INTO imagedb (image_name, content, description) VALUES (?, ?, ?)",
- * new AbstractLobCreatingPreparedStatementCallback(lobHandler) {
- * protected void setValues(PreparedStatement ps, LobCreator lobCreator) throws SQLException {
- * ps.setString(1, name);
- * lobCreator.setBlobAsBinaryStream(ps, 2, contentStream, contentLength);
- * lobCreator.setClobAsString(ps, 3, description);
- * }
- * }
- * );</pre>
- *
- * @author Juergen Hoeller
- * @since 27.04.2004
- * @see org.springframework.jdbc.support.lob.LobCreator
- */
- public abstract class AbstractLobCreatingPreparedStatementCallback implements PreparedStatementCallback {
- private final LobHandler lobHandler;
- /**
- * Create a new AbstractLobCreatingPreparedStatementCallback for the
- * given LobHandler.
- * @param lobHandler the LobHandler to create LobCreators with
- */
- public AbstractLobCreatingPreparedStatementCallback(LobHandler lobHandler) {
- this.lobHandler = lobHandler;
- }
- public final Object doInPreparedStatement(PreparedStatement ps) throws SQLException, DataAccessException {
- LobCreator lobCreator = this.lobHandler.getLobCreator();
- try {
- setValues(ps, lobCreator);
- return new Integer(ps.executeUpdate());
- }
- finally {
- lobCreator.close();
- }
- }
- /**
- * Set values on the given PreparedStatement, using the given
- * LobCreator for BLOB/CLOB arguments.
- * @param ps the PreparedStatement to use
- * @param lobCreator the LobCreator to use
- * @throws SQLException if thrown by JDBC methods
- * @throws DataAccessException in case of custom exceptions
- */
- protected abstract void setValues(PreparedStatement ps, LobCreator lobCreator)
- throws SQLException, DataAccessException;
- }