001/* 002 * Copyright 2002-2017 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.jdbc.datasource; 018 019import java.sql.Connection; 020 021/** 022 * Subinterface of {@link java.sql.Connection} to be implemented by 023 * Connection proxies. Allows access to the underlying target Connection. 024 * 025 * <p>This interface can be checked when there is a need to cast to a 026 * native JDBC Connection such as Oracle's OracleConnection. Spring's 027 * {@link org.springframework.jdbc.support.nativejdbc.NativeJdbcExtractorAdapter} 028 * automatically detects such proxies before delegating to the actual 029 * unwrapping for a specific connection pool. Alternatively, all such 030 * connections also support JDBC 4.0's {@link Connection#unwrap}. 031 * 032 * @author Juergen Hoeller 033 * @since 1.1 034 * @see TransactionAwareDataSourceProxy 035 * @see LazyConnectionDataSourceProxy 036 * @see DataSourceUtils#getTargetConnection(java.sql.Connection) 037 */ 038public interface ConnectionProxy extends Connection { 039 040 /** 041 * Return the target Connection of this proxy. 042 * <p>This will typically be the native driver Connection 043 * or a wrapper from a connection pool. 044 * @return the underlying Connection (never {@code null}) 045 */ 046 Connection getTargetConnection(); 047 048}