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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.
*/
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 com.cloudera.sqoop.lib.SqoopRecord;
import com.cloudera.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
extends UpdateOutputFormat {
private static final Log LOG =
LogFactory.getLog(SqlServerUpsertOutputFormat.class);
@Override
/** {@inheritDoc} */
public RecordWriter 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 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();
}
}
}
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