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Spring Framework example source code file (AbstractSequenceMaxValueIncrementer.java)

This example Spring Framework source code file (AbstractSequenceMaxValueIncrementer.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

abstractdatafieldmaxvalueincrementer, abstractsequencemaxvalueincrementer, abstractsequencemaxvalueincrementer, connection, connection, could, dataaccessexception, dataaccessresourcefailureexception, dataaccessresourcefailureexception, jdbc, sequence, sql, sqlexception, statement, string, string

The Spring Framework AbstractSequenceMaxValueIncrementer.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.incrementer;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.sql.DataSource;

import org.springframework.dao.DataAccessException;
import org.springframework.dao.DataAccessResourceFailureException;
import org.springframework.jdbc.datasource.DataSourceUtils;
import org.springframework.jdbc.support.JdbcUtils;

/**
 * Abstract base class for {@link DataFieldMaxValueIncrementer} implementations that use
 * a database sequence. Subclasses need to provide the database-specific SQL to use.
 *
 * @author Juergen Hoeller
 * @since 26.02.2004
 * @see #getSequenceQuery
 */
public abstract class AbstractSequenceMaxValueIncrementer extends AbstractDataFieldMaxValueIncrementer {

	/**
	 * Default constructor for bean property style usage.
	 * @see #setDataSource
	 * @see #setIncrementerName
	 */
	public AbstractSequenceMaxValueIncrementer() {
	}

	/**
	 * Convenience constructor.
	 * @param dataSource the DataSource to use
	 * @param incrementerName the name of the sequence/table to use
	 */
	public AbstractSequenceMaxValueIncrementer(DataSource dataSource, String incrementerName) {
		super(dataSource, incrementerName);
	}


	/**
	 * Executes the SQL as specified by {@link #getSequenceQuery()}.
	 */
	protected long getNextKey() throws DataAccessException {
		Connection con = DataSourceUtils.getConnection(getDataSource());
		Statement stmt = null;
		ResultSet rs = null;
		try {
			stmt = con.createStatement();
			DataSourceUtils.applyTransactionTimeout(stmt, getDataSource());
			rs = stmt.executeQuery(getSequenceQuery());
			if (rs.next()) {
				return rs.getLong(1);
			}
			else {
				throw new DataAccessResourceFailureException("Sequence query did not return a result");
			}
		}
		catch (SQLException ex) {
			throw new DataAccessResourceFailureException("Could not obtain sequence value", ex);
		}
		finally {
			JdbcUtils.closeResultSet(rs);
			JdbcUtils.closeStatement(stmt);
			DataSourceUtils.releaseConnection(con, getDataSource());
		}
	}

	/**
	 * Return the database-specific query to use for retrieving a sequence value.
	 * <p>The provided SQL is supposed to result in a single row with a single
	 * column that allows for extracting a <code>long value.
	 */
	protected abstract String getSequenceQuery();

}

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