org.springframework.jdbc.support.DatabaseMetaDataCallback.java Source code

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/*
 * Copyright 2002-2016 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
 * @see JdbcUtils#extractDatabaseMetaData
 */
@FunctionalInterface
public interface DatabaseMetaDataCallback {

    /**
     * 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 a 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)
     */
    Object processMetaData(DatabaseMetaData dbmd) throws SQLException, MetaDataAccessException;

}