spring-session Db2JdbcIndexedSessionRepositoryCustomizer 源码
spring-session Db2JdbcIndexedSessionRepositoryCustomizer 代码
文件路径：/spring-session-jdbc/src/main/java/org/springframework/session/jdbc/Db2JdbcIndexedSessionRepositoryCustomizer.java
/*
* Copyright 2014-2020 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
*
* https://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.session.jdbc;
import org.springframework.session.config.SessionRepositoryCustomizer;
/**
* A {@link SessionRepositoryCustomizer} implementation that applies IBM DB2 specific
* optimized SQL statements to {@link JdbcIndexedSessionRepository}.
*
* @author Vedran Pavic
* @since 2.5.0
*/
public class Db2JdbcIndexedSessionRepositoryCustomizer
implements SessionRepositoryCustomizer<JdbcIndexedSessionRepository> {
// @formatter:off
private static final String CREATE_SESSION_ATTRIBUTE_QUERY = ""
+ "MERGE INTO %TABLE_NAME%_ATTRIBUTES SA "
+ "USING ( "
+ " VALUES (?, ?, ?) "
+ ") A (SESSION_PRIMARY_ID, ATTRIBUTE_NAME, ATTRIBUTE_BYTES) "
+ "ON (SA.SESSION_PRIMARY_ID = A.SESSION_PRIMARY_ID and SA.ATTRIBUTE_NAME = A.ATTRIBUTE_NAME) "
+ "WHEN MATCHED THEN "
+ " UPDATE SET ATTRIBUTE_BYTES = A.ATTRIBUTE_BYTES "
+ "WHEN NOT MATCHED THEN "
+ " INSERT (SESSION_PRIMARY_ID, ATTRIBUTE_NAME, ATTRIBUTE_BYTES) "
+ " VALUES (A.SESSION_PRIMARY_ID, A.ATTRIBUTE_NAME, A.ATTRIBUTE_BYTES)";
// @formatter:on
@Override
public void customize(JdbcIndexedSessionRepository sessionRepository) {
sessionRepository.setCreateSessionAttributeQuery(CREATE_SESSION_ATTRIBUTE_QUERY);
}
}
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