/*
*
* * Copyright 2010-2014 Orient Technologies LTD (info(at)orientechnologies.com)
* *
* * Licensed 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 com.orientechnologies.orient.etl.extractor;
import com.orientechnologies.orient.core.command.OCommandContext;
import com.orientechnologies.orient.core.exception.OConfigurationException;
import com.orientechnologies.orient.core.metadata.schema.OType;
import com.orientechnologies.orient.core.record.impl.ODocument;
import com.orientechnologies.orient.etl.OETLProcessor;
import com.orientechnologies.orient.etl.OExtractedItem;
import java.io.Reader;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Types;
import java.util.ArrayList;
import java.util.List;
import java.util.NoSuchElementException;
public class OJDBCExtractor extends OAbstractExtractor {
protected String url;
protected String userName;
protected String userPassword;
protected String query;
protected String queryCount;
protected String driverClass;
protected Connection conn;
protected Statement stm;
protected ResultSet rs;
protected boolean didNext = false;
protected boolean hasNext = false;
protected int rsColumns;
protected List<String> columnNames = null;
protected List<OType> columnTypes = null;
protected int fetchSize = 10000;
@Override
public void configure(OETLProcessor iProcessor, ODocument iConfiguration, OCommandContext iContext) {
super.configure(iProcessor, iConfiguration, iContext);
driverClass = (String) resolve(iConfiguration.field("driver"));
url = (String) resolve(iConfiguration.field("url"));
userName = (String) resolve(iConfiguration.field("userName"));
userPassword = (String) resolve(iConfiguration.field("userPassword"));
query = (String) resolve(iConfiguration.field("query"));
queryCount = (String) resolve(iConfiguration.field("queryCount"));
if (iConfiguration.containsField("fetchSize"))
fetchSize = (Integer) resolve(iConfiguration.field("fetchSize"));
try {
Class.forName(driverClass).newInstance();
} catch (Exception e) {
throw new OConfigurationException("[JDBC extractor] JDBC Driver " + driverClass + " not found", e);
}
try {
conn = DriverManager.getConnection(url, userName, userPassword);
} catch (Exception e) {
throw new OConfigurationException("[JDBC extractor] error on connecting to JDBC url '" + url + "' using user '" + userName
+ "' and the password provided", e);
}
}
@Override
public void begin() {
try {
stm = conn.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
stm.setFetchSize(fetchSize);
if (queryCount != null) {
// GET THE TOTAL COUNTER
final ResultSet countRs = stm.executeQuery(query);
try {
if (countRs != null && countRs.next())
total = countRs.getInt(1);
} finally {
if (countRs != null)
try {
countRs.close();
} catch (SQLException e) {
}
}
}
rs = stm.executeQuery(query);
rsColumns = rs.getMetaData().getColumnCount();
columnNames = new ArrayList<String>(rsColumns);
columnTypes = new ArrayList<OType>(rsColumns);
for (int i = 1; i <= rsColumns; ++i) {
final String colName = rs.getMetaData().getColumnName(i);
columnNames.add(colName);
OType type = OType.ANY;
final int sqlType = rs.getMetaData().getColumnType(i);
switch (sqlType) {
case Types.BOOLEAN:
type = OType.BOOLEAN;
break;
case Types.SMALLINT:
type = OType.SHORT;
break;
case Types.INTEGER:
type = OType.INTEGER;
break;
case Types.FLOAT:
type = OType.FLOAT;
break;
case Types.DOUBLE:
type = OType.DOUBLE;
break;
case Types.BIGINT:
type = OType.LONG;
break;
case Types.DECIMAL:
type = OType.DECIMAL;
break;
case Types.DATE:
type = OType.DATE;
break;
case Types.TIMESTAMP:
type = OType.DATETIME;
break;
case Types.VARCHAR:
case Types.LONGNVARCHAR:
case Types.LONGVARCHAR:
type = OType.STRING;
break;
case Types.BINARY:
case Types.BLOB:
type = OType.BINARY;
break;
case Types.CHAR:
case Types.TINYINT:
type = OType.BYTE;
break;
}
columnTypes.add(type);
}
} catch (SQLException e) {
throw new OExtractorException("[JDBC extractor] error on executing query '" + query + "'", e);
}
}
@Override
public void end() {
if (rs != null)
try {
rs.close();
} catch (SQLException e) {
}
if (stm != null)
try {
stm.close();
} catch (SQLException e) {
}
if (conn != null)
try {
conn.close();
} catch (SQLException e) {
}
}
@Override
public void extract(final Reader iReader) {
}
@Override
public String getUnit() {
return "records";
}
@Override
public boolean hasNext() {
try {
if (!didNext) {
hasNext = rs.next();
current++;
didNext = true;
}
return hasNext;
} catch (SQLException e) {
throw new OExtractorException("[JDBC extractor] error on moving forward in resultset of query '" + query
+ "'. Previous position was " + current, e);
}
}
@Override
public OExtractedItem next() {
try {
if (!didNext) {
if (!rs.next())
throw new NoSuchElementException("[JDBC extractor] previous position was " + current);
}
didNext = false;
final ODocument doc = new ODocument();
for (int i = 0; i < rsColumns; i++) {
// final OType fieldType = columnTypes != null ? columnTypes.get(i) : null;
Object fieldValue = rs.getObject(i + 1);
doc.field(columnNames.get(i), fieldValue);
}
return new OExtractedItem(current++, doc);
} catch (SQLException e) {
throw new OExtractorException("[JDBC extractor] error on moving forward in resultset of query '" + query
+ "'. Previous position was " + current, e);
}
}
@Override
public ODocument getConfiguration() {
return new ODocument().fromJSON("{parameters:[{driver:{optional:false,description:'JDBC Driver class'}},"
+ "{url:{optional:false,description:'Connection URL'}}," + "{userName:{optional:false,description:'User name'}},"
+ "{userPassword:{optional:false,description:'User password'}},"
+ "{fetchSize:{optional:true,description:'JDBC cursor fetch size. Default is 10000'}},"
+ "{query:{optional:false,description:'Query that extract records'}},"
+ "{queryCount:{optional:true,description:'Query that returns the count to have a correct progress status'}}],"
+ "output:'ODocument'}");
}
@Override
public String getName() {
return "jdbc";
}
}
