spring DatabaseMetaDataCallback 源码
spring DatabaseMetaDataCallback 代码
文件路径：/spring-jdbc/src/main/java/org/springframework/jdbc/support/DatabaseMetaDataCallback.java
/*
* Copyright 2002-2020 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.jdbc.support;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;
/**
* A callback interface used by the JdbcUtils class. Implementations of this
* interface perform the actual work of extracting database meta-data, but
* don't need to worry about exception handling. SQLExceptions will be caught
* and handled correctly by the JdbcUtils class.
*
* @author Thomas Risberg
* @author Juergen Hoeller
* @param <T> the result type
* @see JdbcUtils#extractDatabaseMetaData(javax.sql.DataSource, DatabaseMetaDataCallback)
*/
@FunctionalInterface
public interface DatabaseMetaDataCallback<T> {
/**
* Implementations must implement this method to process the meta-data
* passed in. Exactly what the implementation chooses to do is up to it.
* @param dbmd the DatabaseMetaData to process
* @return a result object extracted from the meta-data
* (can be an arbitrary object, as needed by the implementation)
* @throws SQLException if an SQLException is encountered getting
* column values (that is, there's no need to catch SQLException)
* @throws MetaDataAccessException in case of other failures while
* extracting meta-data (for example, reflection failure)
*/
T processMetaData(DatabaseMetaData dbmd) throws SQLException, MetaDataAccessException;
}
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