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/*-
* ============LICENSE_START=======================================================
* ONAP : APPC
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Copyright (C) 2017 Amdocs
* =============================================================================
* 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.
*
* ECOMP is a trademark and service mark of AT&T Intellectual Property.
* ============LICENSE_END=========================================================
*/
package org.onap.appc.dao.util.helper;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
/**
* This class provides the basic utility methods of database connection
* <p>
* Since currently this class only contains stateless methods, the package
* is exported by maven-bundle-plugin. If you have to add some stateful methods
* in this class, one suggested solution is that use blueprint to create a singleton
* which is exported as service
*/
public class DBHelper {
/**
* Closes a database resultSet,statement and connection in that order. Data access objects should call this method
* in a finally block.
*
* @param resultSet or null
* @param statement or null
* @param connection or null
*/
public static void close(ResultSet resultSet, Statement statement, Connection connection) {
try {
closeResultSet(resultSet);
} finally {
try {
closeStatement(statement);
} finally {
closeConnection(connection);
}
}
}
/**
* Closes a database result set. Data access objects should call this method
* when a result set is no longer needed.
*
* @param rs A ResultSet Object
*/
public static void closeResultSet(ResultSet rs) {
try {
if (rs != null) {
rs.close();
}
} catch (SQLException se) {
// Ignore this exception and allow execution to continue.
// so that connection can try to be close.
}
}
/**
* Closes a database query statement. Data access objects should call this
* method when a statement is no longer needed.
*
* @param stmt A Statement Object
*/
public static void closeStatement(Statement stmt) {
try {
if (stmt != null) {
stmt.close();
}
} catch (SQLException se) {
// Ignore this exception and allow execution to continue.
// so that connection can try to be close.
}
}
/**
* Closes a database connection. Data access objects should call this method
* when a database connection is no longer needed.
*
* @param connection A Connection Object *
*/
public static void closeConnection(Connection connection) {
try {
if (connection != null && !connection.isClosed()) {
connection.close();
}
} catch (SQLException se) {
// Ignore this exception and allow execution to continue.
}
}
}
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