| /** |
| * 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 org.apache.sqoop.mapreduce.db.DBConfiguration; |
| import org.apache.sqoop.mapreduce.db.DBInputFormat; |
| import org.apache.sqoop.mapreduce.db.DataDrivenDBInputFormat; |
| import org.apache.sqoop.mapreduce.db.DataDrivenDBRecordReader; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.sqoop.manager.SQLServerManager; |
| import org.apache.sqoop.mapreduce.DBWritable; |
| |
| import java.sql.Connection; |
| import java.sql.SQLException; |
| |
| /** |
| * Microsoft SQL Server specific Record Reader. |
| */ |
| public class SqlServerRecordReader<T extends DBWritable> |
| extends DataDrivenDBRecordReader<T> { |
| |
| private static final Log LOG = |
| LogFactory.getLog(SqlServerRecordReader.class); |
| |
| // CHECKSTYLE:OFF |
| public SqlServerRecordReader(DBInputFormat.DBInputSplit split, |
| Class<T> inputClass, Configuration conf, Connection conn, |
| DBConfiguration dbConfig, String cond, String [] fields, |
| String table) throws SQLException { |
| |
| super(split, inputClass, conf, conn, dbConfig, cond, fields, table, |
| "MICROSOFT SQL SERVER"); |
| } |
| // CHECKSTYLE:ON |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| protected String getSelectQuery() { |
| StringBuilder query = new StringBuilder(); |
| |
| DataDrivenDBInputFormat.DataDrivenDBInputSplit dataSplit = |
| (DataDrivenDBInputFormat.DataDrivenDBInputSplit) getSplit(); |
| |
| DBConfiguration dbConf = getDBConf(); |
| String [] fieldNames = getFieldNames(); |
| String tableName = getTableName(); |
| String conditions = getConditions(); |
| |
| // Build the WHERE clauses associated with the data split first. |
| // We need them in both branches of this function. |
| StringBuilder conditionClauses = new StringBuilder(); |
| conditionClauses.append("( ").append(dataSplit.getLowerClause()); |
| conditionClauses.append(" ) AND ( ").append(dataSplit.getUpperClause()); |
| conditionClauses.append(" )"); |
| |
| if (dbConf.getInputQuery() == null) { |
| // We need to generate the entire query. |
| query.append("SELECT "); |
| |
| for (int i = 0; i < fieldNames.length; i++) { |
| query.append(fieldNames[i]); |
| if (i != fieldNames.length -1) { |
| query.append(", "); |
| } |
| } |
| |
| query.append(" FROM ").append(tableName); |
| |
| String tableHints = |
| dbConf.getConf().get(SQLServerManager.TABLE_HINTS_PROP); |
| if (tableHints != null) { |
| LOG.info("Using table hints: " + tableHints); |
| query.append(" WITH (").append(tableHints).append(")"); |
| } |
| |
| query.append(" WHERE "); |
| if (conditions != null && conditions.length() > 0) { |
| // Put the user's conditions first. |
| query.append("( ").append(conditions).append(" ) AND "); |
| } |
| |
| // Now append the conditions associated with our split. |
| query.append(conditionClauses.toString()); |
| |
| } else { |
| // User provided the query. We replace the special token with |
| // our WHERE clause. |
| String inputQuery = dbConf.getInputQuery(); |
| if (inputQuery.indexOf(DataDrivenDBInputFormat.SUBSTITUTE_TOKEN) == -1) { |
| LOG.error("Could not find the clause substitution token " |
| + DataDrivenDBInputFormat.SUBSTITUTE_TOKEN + " in the query: [" |
| + inputQuery + "]. Parallel splits may not work correctly."); |
| } |
| |
| query.append(inputQuery.replace(DataDrivenDBInputFormat.SUBSTITUTE_TOKEN, |
| conditionClauses.toString())); |
| } |
| |
| LOG.info("Using query: " + query.toString()); |
| return query.toString(); |
| } |
| } |