/** * 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.lib; import java.math.BigDecimal; import java.sql.Date; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Time; import java.sql.Timestamp; import org.apache.hadoop.io.BytesWritable; import com.cloudera.sqoop.lib.BlobRef; import com.cloudera.sqoop.lib.ClobRef; /** * Contains a set of methods which can read db columns from a ResultSet into * Java types, and do serialization of these types to/from DataInput/DataOutput * for use with Hadoop's Writable implementation. This supports null values * for all types. */ public final class JdbcWritableBridge { // Currently, cap BLOB/CLOB objects at 16 MB until we can use external // storage. public static final long MAX_BLOB_LENGTH = 16 * 1024 * 1024; public static final long MAX_CLOB_LENGTH = 16 * 1024 * 1024; private JdbcWritableBridge() { } public static Integer readInteger(int colNum, ResultSet r) throws SQLException { int val; val = r.getInt(colNum); if (r.wasNull()) { return null; } else { return Integer.valueOf(val); } } public static Long readLong(int colNum, ResultSet r) throws SQLException { long val; val = r.getLong(colNum); if (r.wasNull()) { return null; } else { return Long.valueOf(val); } } public static String readString(int colNum, ResultSet r) throws SQLException { return r.getString(colNum); } public static Float readFloat(int colNum, ResultSet r) throws SQLException { float val; val = r.getFloat(colNum); if (r.wasNull()) { return null; } else { return Float.valueOf(val); } } public static Double readDouble(int colNum, ResultSet r) throws SQLException { double val; val = r.getDouble(colNum); if (r.wasNull()) { return null; } else { return Double.valueOf(val); } } public static Boolean readBoolean(int colNum, ResultSet r) throws SQLException { boolean val; val = r.getBoolean(colNum); if (r.wasNull()) { return null; } else { return Boolean.valueOf(val); } } public static Time readTime(int colNum, ResultSet r) throws SQLException { return r.getTime(colNum); } public static Timestamp readTimestamp(int colNum, ResultSet r) throws SQLException { return r.getTimestamp(colNum); } public static Date readDate(int colNum, ResultSet r) throws SQLException { return r.getDate(colNum); } public static BytesWritable readBytesWritable(int colNum, ResultSet r) throws SQLException { byte [] bytes = r.getBytes(colNum); return bytes == null ? null : new BytesWritable(bytes); } public static BigDecimal readBigDecimal(int colNum, ResultSet r) throws SQLException { return r.getBigDecimal(colNum); } public static BlobRef readBlobRef(int colNum, ResultSet r) throws SQLException { // Loading of BLOBs is delayed; handled by LargeObjectLoader. return null; } public static ClobRef readClobRef(int colNum, ResultSet r) throws SQLException { // Loading of CLOBs is delayed; handled by LargeObjectLoader. return null; } public static void writeInteger(Integer val, int paramIdx, int sqlType, PreparedStatement s) throws SQLException { if (null == val) { s.setNull(paramIdx, sqlType); } else { s.setInt(paramIdx, val); } } public static void writeLong(Long val, int paramIdx, int sqlType, PreparedStatement s) throws SQLException { if (null == val) { s.setNull(paramIdx, sqlType); } else { s.setLong(paramIdx, val); } } public static void writeDouble(Double val, int paramIdx, int sqlType, PreparedStatement s) throws SQLException { if (null == val) { s.setNull(paramIdx, sqlType); } else { s.setDouble(paramIdx, val); } } public static void writeBoolean(Boolean val, int paramIdx, int sqlType, PreparedStatement s) throws SQLException { if (null == val) { s.setNull(paramIdx, sqlType); } else { s.setBoolean(paramIdx, val); } } public static void writeFloat(Float val, int paramIdx, int sqlType, PreparedStatement s) throws SQLException { if (null == val) { s.setNull(paramIdx, sqlType); } else { s.setFloat(paramIdx, val); } } public static void writeString(String val, int paramIdx, int sqlType, PreparedStatement s) throws SQLException { if (null == val) { s.setNull(paramIdx, sqlType); } else { s.setString(paramIdx, val); } } public static void writeTimestamp(Timestamp val, int paramIdx, int sqlType, PreparedStatement s) throws SQLException { if (null == val) { s.setNull(paramIdx, sqlType); } else { s.setTimestamp(paramIdx, val); } } public static void writeTime(Time val, int paramIdx, int sqlType, PreparedStatement s) throws SQLException { if (null == val) { s.setNull(paramIdx, sqlType); } else { s.setTime(paramIdx, val); } } public static void writeDate(Date val, int paramIdx, int sqlType, PreparedStatement s) throws SQLException { if (null == val) { s.setNull(paramIdx, sqlType); } else { s.setDate(paramIdx, val); } } public static void writeBytesWritable(BytesWritable val, int paramIdx, int sqlType, PreparedStatement s) throws SQLException { if (null == val) { s.setNull(paramIdx, sqlType); } else { // val.getBytes() is only valid in [0, len) byte [] rawBytes = val.getBytes(); int len = val.getLength(); byte [] outBytes = new byte[len]; System.arraycopy(rawBytes, 0, outBytes, 0, len); s.setBytes(paramIdx, outBytes); } } public static void writeBigDecimal(BigDecimal val, int paramIdx, int sqlType, PreparedStatement s) throws SQLException { if (null == val) { s.setNull(paramIdx, sqlType); } else { s.setBigDecimal(paramIdx, val); } } public static void writeBlobRef(com.cloudera.sqoop.lib.BlobRef val, int paramIdx, int sqlType, PreparedStatement s) throws SQLException { // TODO: support this. throw new RuntimeException("Unsupported: Cannot export BLOB data"); } public static void writeClobRef(com.cloudera.sqoop.lib.ClobRef val, int paramIdx, int sqlType, PreparedStatement s) throws SQLException { // TODO: support this. throw new RuntimeException("Unsupported: Cannot export CLOB data"); } }