| /** |
| * 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. |
| */ |
| |
| package org.apache.sqoop.mapreduce; |
| |
| import java.io.IOException; |
| import java.sql.Connection; |
| import java.sql.PreparedStatement; |
| import java.sql.SQLException; |
| import java.util.List; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.mapreduce.JobContext; |
| import org.apache.hadoop.mapreduce.RecordWriter; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| import org.apache.sqoop.mapreduce.db.DBConfiguration; |
| |
| import org.apache.sqoop.lib.SqoopRecord; |
| |
| /** |
| * Insert the emitted keys as records into a database table. |
| * This supports a configurable "spill threshold" at which |
| * point intermediate transactions are committed. |
| * |
| * Record objects are buffered before actually performing the INSERT |
| * statements; this requires that the key implement the |
| * SqoopRecord interface. |
| * |
| * Uses DBOutputFormat/DBConfiguration for configuring the output. |
| */ |
| public class ExportCallOutputFormat<K extends SqoopRecord, V> |
| extends AsyncSqlOutputFormat<K, V> { |
| |
| private static final Log LOG = LogFactory.getLog( |
| ExportCallOutputFormat.class); |
| |
| @Override |
| /** {@inheritDoc} */ |
| public void checkOutputSpecs(JobContext context) |
| throws IOException, InterruptedException { |
| Configuration conf = context.getConfiguration(); |
| DBConfiguration dbConf = new DBConfiguration(conf); |
| |
| // Sanity check all the configuration values we need. |
| if (null == conf.get(DBConfiguration.URL_PROPERTY)) { |
| throw new IOException("Database connection URL is not set."); |
| } else if (null == dbConf.getOutputTableName()) { |
| throw new IOException("Procedure name is not set for export"); |
| } else if (null == dbConf.getOutputFieldNames() |
| && 0 == dbConf.getOutputFieldCount()) { |
| throw new IOException( |
| "Output field names are null and zero output field count set."); |
| } |
| } |
| |
| @Override |
| /** {@inheritDoc} */ |
| public RecordWriter<K, V> getRecordWriter(TaskAttemptContext context) |
| throws IOException { |
| try { |
| return new ExportCallRecordWriter(context); |
| } catch (Exception e) { |
| throw new IOException(e); |
| } |
| } |
| |
| /** |
| * RecordWriter to write the output to a row in a database table. |
| * The actual database updates are executed in a second thread. |
| */ |
| public class ExportCallRecordWriter extends AsyncSqlRecordWriter<K, V> { |
| |
| protected String procedureName; |
| protected String [] columnNames; // The columns to insert into. |
| protected int columnCount; // If columnNames is null, tells ## of cols. |
| |
| public ExportCallRecordWriter(TaskAttemptContext context) |
| throws ClassNotFoundException, SQLException { |
| super(context); |
| |
| Configuration conf = getConf(); |
| |
| DBConfiguration dbConf = new DBConfiguration(conf); |
| procedureName = dbConf.getOutputTableName(); |
| columnNames = dbConf.getOutputFieldNames(); |
| columnCount = dbConf.getOutputFieldCount(); |
| } |
| |
| @Override |
| /** {@inheritDoc} */ |
| protected PreparedStatement getPreparedStatement( |
| List<SqoopRecord> userRecords) throws SQLException { |
| |
| PreparedStatement stmt = null; |
| |
| // Synchronize on connection to ensure this does not conflict |
| // with the operations in the update thread. |
| Connection conn = getConnection(); |
| synchronized (conn) { |
| stmt = conn.prepareCall(getCallStatement(userRecords.size())); |
| } |
| |
| for (SqoopRecord record : userRecords) { |
| record.write(stmt, 0); |
| stmt.addBatch(); |
| } |
| |
| return stmt; |
| } |
| |
| @Override |
| protected boolean isBatchExec() { |
| return true; |
| } |
| |
| /** |
| * @return an INSERT statement suitable for inserting 'numRows' rows. |
| */ |
| protected String getCallStatement(int numRows) { |
| StringBuilder sb = new StringBuilder(); |
| |
| sb.append("{call " + procedureName + " ("); |
| |
| int numSlots = columnNames == null ? columnCount : columnNames.length; |
| if (numSlots > 0) { |
| sb.append("?"); |
| } |
| for(int i = 1; i < numSlots; ++i) { |
| sb.append(", ?"); |
| } |
| |
| sb.append(")}"); |
| |
| return sb.toString(); |
| } |
| } |
| } |