| /** |
| * 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.sqlserver; |
| |
| import java.io.IOException; |
| import java.sql.SQLException; |
| import java.util.Arrays; |
| import java.util.List; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.mapreduce.RecordWriter; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| import org.apache.sqoop.manager.SQLServerManager; |
| |
| import org.apache.sqoop.lib.SqoopRecord; |
| import org.apache.sqoop.mapreduce.UpdateOutputFormat; |
| |
| /** |
| * Update an existing table with new value if the table already |
| * contains the row, or insert the data into the table if the table |
| * does not contain the row yet. |
| */ |
| public class SqlServerUpsertOutputFormat<K extends SqoopRecord, V> |
| extends UpdateOutputFormat<K, V> { |
| |
| private static final Log LOG = |
| LogFactory.getLog(SqlServerUpsertOutputFormat.class); |
| |
| @Override |
| /** {@inheritDoc} */ |
| public RecordWriter<K, V> getRecordWriter(TaskAttemptContext context) |
| throws IOException { |
| try { |
| return new SqlServerUpsertRecordWriter(context); |
| } catch (Exception e) { |
| throw new IOException(e); |
| } |
| } |
| |
| /** |
| * RecordWriter to write the output to UPDATE/INSERT statements. |
| */ |
| public class SqlServerUpsertRecordWriter extends UpdateRecordWriter { |
| |
| public SqlServerUpsertRecordWriter(TaskAttemptContext context) |
| throws ClassNotFoundException, SQLException { |
| super(context); |
| } |
| |
| @Override |
| /** |
| * @return an UPDATE/INSERT statement that modifies/inserts a row |
| * depending on whether the row already exist in the table or not. |
| */ |
| protected String getUpdateStatement() { |
| boolean first; |
| List<String> updateKeyLookup = Arrays.asList(updateCols); |
| StringBuilder sb = new StringBuilder(); |
| |
| if (getConf().getBoolean(SQLServerManager.IDENTITY_INSERT_PROP, false)) { |
| LOG.info("Enabling identity inserts"); |
| sb.append("SET IDENTITY_INSERT ").append(tableName).append(" ON "); |
| } |
| |
| sb.append("MERGE INTO ").append(tableName).append(" AS _target"); |
| sb.append(" USING ( VALUES ( "); |
| first = true; |
| for (String col : columnNames) { |
| if (first) { |
| first = false; |
| } else { |
| sb.append(", "); |
| } |
| sb.append("?"); |
| } |
| sb.append(" ) )").append(" AS _source ( "); |
| first = true; |
| for (String col : columnNames) { |
| if (first) { |
| first = false; |
| } else { |
| sb.append(", "); |
| } |
| sb.append(col); |
| } |
| sb.append(" )"); |
| |
| sb.append(" ON "); |
| first = true; |
| for (String updateCol : updateCols) { |
| if (updateKeyLookup.contains(updateCol)) { |
| if (first) { |
| first = false; |
| } else { |
| sb.append(" AND "); |
| } |
| sb.append("_source.").append(updateCol).append(" = _target.").append(updateCol); |
| } |
| } |
| |
| sb.append(" WHEN MATCHED THEN UPDATE SET "); |
| first = true; |
| for (String col : columnNames) { |
| if (!updateKeyLookup.contains(col)) { |
| if (first) { |
| first = false; |
| } else { |
| sb.append(", "); |
| } |
| sb.append("_target.").append(col).append(" = _source.").append(col); |
| } |
| } |
| |
| sb.append(" WHEN NOT MATCHED THEN ").append("INSERT ( "); |
| first = true; |
| for (String col : columnNames) { |
| if (first) { |
| first = false; |
| } else { |
| sb.append(", "); |
| } |
| sb.append(col); |
| } |
| sb.append(" ) VALUES ( "); |
| first = true; |
| for (String col : columnNames) { |
| if (first) { |
| first = false; |
| } else { |
| sb.append(", "); |
| } |
| sb.append("_source.").append(col); |
| } |
| sb.append(" )"); |
| |
| sb.append(";"); |
| |
| return sb.toString(); |
| } |
| } |
| } |