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ARTEMIS-1813 DB2 should avoid Blob to append data
DB2 10.5 doesn't allow to append Blob data to an existing Blob, producing unexpected errors: a custom DB2 sequential file can perfom the append by using a customized UPDATE statement. max-blob-size.db2 and create-file-table.db2 are changed to match the 2 GB max blob size limit allowed by DB2.
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79 changes: 79 additions & 0 deletions
79
...re/src/main/java/org/apache/activemq/artemis/jdbc/store/file/Db2SequentialFileDriver.java
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| /** | ||
| * Licensed to the Apache Software Foundation (ASF) under one or more | ||
| * contributor license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright ownership. | ||
| * The ASF licenses this file to You 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. | ||
| */ | ||
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| package org.apache.activemq.artemis.jdbc.store.file; | ||
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| import javax.sql.DataSource; | ||
| import java.sql.Connection; | ||
| import java.sql.SQLException; | ||
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| import org.apache.activemq.artemis.jdbc.store.sql.SQLProvider; | ||
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| @SuppressWarnings("SynchronizeOnNonFinalField") | ||
| public final class Db2SequentialFileDriver extends JDBCSequentialFileFactoryDriver { | ||
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| public Db2SequentialFileDriver() { | ||
| super(); | ||
| } | ||
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| public Db2SequentialFileDriver(DataSource dataSource, SQLProvider provider) { | ||
| super(dataSource, provider); | ||
| } | ||
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| public Db2SequentialFileDriver(Connection connection, SQLProvider provider) { | ||
| super(connection, provider); | ||
| } | ||
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| @Override | ||
| protected void prepareStatements() throws SQLException { | ||
| this.deleteFile = connection.prepareStatement(sqlProvider.getDeleteFileSQL()); | ||
| this.createFile = connection.prepareStatement(sqlProvider.getInsertFileSQL(), new String[]{"ID"}); | ||
| this.selectFileByFileName = connection.prepareStatement(sqlProvider.getSelectFileByFileName()); | ||
| this.copyFileRecord = connection.prepareStatement(sqlProvider.getCopyFileRecordByIdSQL()); | ||
| this.renameFile = connection.prepareStatement(sqlProvider.getUpdateFileNameByIdSQL()); | ||
| this.readLargeObject = connection.prepareStatement(sqlProvider.getReadLargeObjectSQL()); | ||
| this.appendToLargeObject = connection.prepareStatement(sqlProvider.getAppendToLargeObjectSQL()); | ||
| this.selectFileNamesByExtension = connection.prepareStatement(sqlProvider.getSelectFileNamesByExtensionSQL()); | ||
| } | ||
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| @Override | ||
| public int writeToFile(JDBCSequentialFile file, byte[] data) throws SQLException { | ||
| if (data == null || data.length == 0) { | ||
| return 0; | ||
| } | ||
| synchronized (connection) { | ||
| try { | ||
| connection.setAutoCommit(false); | ||
| int bytesWritten; | ||
| appendToLargeObject.setBytes(1, data); | ||
| appendToLargeObject.setLong(2, file.getId()); | ||
| final int updatesFiles = appendToLargeObject.executeUpdate(); | ||
| assert updatesFiles <= 1; | ||
| connection.commit(); | ||
| if (updatesFiles == 0) { | ||
| bytesWritten = 0; | ||
| } else { | ||
| bytesWritten = data.length; | ||
| } | ||
| return bytesWritten; | ||
| } catch (SQLException e) { | ||
| connection.rollback(); | ||
| throw e; | ||
| } | ||
| } | ||
| } | ||
| } |
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