| /** |
| * 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.SQLException; |
| import org.apache.hadoop.mapreduce.RecordWriter; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| import org.apache.sqoop.lib.SqoopRecord; |
| |
| /** |
| * SQLServer-specific SQL formatting overrides default ExportOutputFormat's. |
| */ |
| public class SQLServerExportOutputFormat<K extends SqoopRecord, V> |
| extends ExportOutputFormat<K, V> { |
| |
| @Override |
| /** {@inheritDoc} */ |
| public RecordWriter<K, V> getRecordWriter(TaskAttemptContext context) |
| throws IOException { |
| try { |
| return new SQLServerExportRecordWriter<K, V>(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 SQLServerExportRecordWriter<K extends SqoopRecord, V> |
| extends ExportRecordWriter { |
| |
| public SQLServerExportRecordWriter(TaskAttemptContext context) |
| throws ClassNotFoundException, SQLException { |
| super(context); |
| } |
| |
| @Override |
| /** |
| * @return an INSERT statement suitable for inserting 'numRows' rows. |
| */ |
| protected String getInsertStatement(int numRows) { |
| StringBuilder sb = new StringBuilder(); |
| |
| sb.append("INSERT INTO " + getTableName() + " "); |
| |
| int numSlots; |
| String [] colNames = getColumnNames(); |
| if (colNames != null) { |
| numSlots = colNames.length; |
| |
| sb.append("("); |
| boolean first = true; |
| for (String col : colNames) { |
| if (!first) { |
| sb.append(", "); |
| } |
| |
| sb.append(col); |
| first = false; |
| } |
| |
| sb.append(") "); |
| } else { |
| numSlots = getColumnCount(); // set if columnNames is null. |
| } |
| |
| // generates the (?, ?, ?...) used for each row. |
| StringBuilder sbRow = new StringBuilder(); |
| sbRow.append("(SELECT "); |
| for (int i = 0; i < numSlots; i++) { |
| if (i != 0) { |
| sbRow.append(", "); |
| } |
| |
| sbRow.append("?"); |
| } |
| sbRow.append(") "); |
| |
| // Now append that numRows times. |
| for (int i = 0; i < numRows; i++) { |
| if (i != 0) { |
| sb.append("UNION ALL "); |
| } |
| |
| sb.append(sbRow); |
| } |
| |
| return sb.toString(); |
| } |
| } |
| } |