Spring Framework example source code file (JdbcAccessor.java)

This example Spring Framework source code file (JdbcAccessor.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

datasource, datasource, illegalargumentexception, initializingbean, initializingbean, jdbcaccessor, log, property, sql, sqlerrorcodesqlexceptiontranslator, sqlerrorcodesqlexceptiontranslator, sqlexceptiontranslator, sqlexceptiontranslator, sqlstatesqlexceptiontranslator

The Spring Framework JdbcAccessor.java source code

/*
 * Copyright 2002-2007 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;

import javax.sql.DataSource;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.beans.factory.InitializingBean;

/**
 * Base class for {@link org.springframework.jdbc.core.JdbcTemplate} and
 * other JDBC-accessing DAO helpers, defining common properties such as
 * DataSource and exception translator.
 *
 * <p>Not intended to be used directly.
 * See {@link org.springframework.jdbc.core.JdbcTemplate}.
 *
 * @author Juergen Hoeller
 * @since 28.11.2003
 * @see org.springframework.jdbc.core.JdbcTemplate
 */
public abstract class JdbcAccessor implements InitializingBean {

	/** Logger available to subclasses */
	protected final Log logger = LogFactory.getLog(getClass());

	private DataSource dataSource;

	private SQLExceptionTranslator exceptionTranslator;

	private boolean lazyInit = true;


	/**
	 * Set the JDBC DataSource to obtain connections from.
	 */
	public void setDataSource(DataSource dataSource) {
		this.dataSource = dataSource;
	}

	/**
	 * Return the DataSource used by this template.
	 */
	public DataSource getDataSource() {
		return this.dataSource;
	}

	/**
	 * Specify the database product name for the DataSource that this accessor uses.
	 * This allows to initialize a SQLErrorCodeSQLExceptionTranslator without
	 * obtaining a Connection from the DataSource to get the metadata.
	 * @param dbName the database product name that identifies the error codes entry
	 * @see SQLErrorCodeSQLExceptionTranslator#setDatabaseProductName
	 * @see java.sql.DatabaseMetaData#getDatabaseProductName()
	 */
	public void setDatabaseProductName(String dbName) {
		this.exceptionTranslator = new SQLErrorCodeSQLExceptionTranslator(dbName);
	}

	/**
	 * Set the exception translator for this instance.
	 * <p>If no custom translator is provided, a default
	 * {@link SQLErrorCodeSQLExceptionTranslator} is used
	 * which examines the SQLException's vendor-specific error code.
	 * @see org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator
	 * @see org.springframework.jdbc.support.SQLStateSQLExceptionTranslator
	 */
	public void setExceptionTranslator(SQLExceptionTranslator exceptionTranslator) {
		this.exceptionTranslator = exceptionTranslator;
	}

	/**
	 * Return the exception translator for this instance.
	 * <p>Creates a default {@link SQLErrorCodeSQLExceptionTranslator}
	 * for the specified DataSource if none set, or a
	 * {@link SQLStateSQLExceptionTranslator} in case of no DataSource.
	 * @see #getDataSource()
	 */
	public synchronized SQLExceptionTranslator getExceptionTranslator() {
		if (this.exceptionTranslator == null) {
			DataSource dataSource = getDataSource();
			if (dataSource != null) {
				this.exceptionTranslator = new SQLErrorCodeSQLExceptionTranslator(dataSource);
			}
			else {
				this.exceptionTranslator = new SQLStateSQLExceptionTranslator();
			}
		}
		return this.exceptionTranslator;
	}

	/**
	 * Set whether to lazily initialize the SQLExceptionTranslator for this accessor,
	 * on first encounter of a SQLException. Default is "true"; can be switched to
	 * "false" for initialization on startup.
	 * <p>Early initialization just applies if afterPropertiesSet() is called.
	 * @see #getExceptionTranslator()
	 * @see #afterPropertiesSet()
	 */
	public void setLazyInit(boolean lazyInit) {
		this.lazyInit = lazyInit;
	}

	/**
	 * Return whether to lazily initialize the SQLExceptionTranslator for this accessor.
	 * @see #getExceptionTranslator()
	 */
	public boolean isLazyInit() {
		return this.lazyInit;
	}

	/**
	 * Eagerly initialize the exception translator, if demanded,
	 * creating a default one for the specified DataSource if none set.
	 */
	public void afterPropertiesSet() {
		if (getDataSource() == null) {
			throw new IllegalArgumentException("Property 'dataSource' is required");
		}
		if (!isLazyInit()) {
			getExceptionTranslator();
		}
	}

}