/*
* eGov suite of products aim to improve the internal efficiency,transparency,
* accountability and the service delivery of the government organizations.
*
* Copyright (C) <2015> eGovernments Foundation
*
* The updated version of eGov suite of products as by eGovernments Foundation
* is available at http://www.egovernments.org
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses/ or
* http://www.gnu.org/licenses/gpl.html .
*
* In addition to the terms of the GPL license to be adhered to in using this
* program, the following additional terms are to be complied with:
*
* 1) All versions of this program, verbatim or modified must carry this
* Legal Notice.
*
* 2) Any misrepresentation of the origin of the material is prohibited. It
* is required that all modified versions of this material be marked in
* reasonable ways as different from the original version.
*
* 3) This license does not grant any rights to any user of the program
* with regards to rights under trademark law for use of the trade names
* or trademarks of eGovernments Foundation.
*
* In case of any queries, you can reach eGovernments Foundation at contact@egovernments.org.
*/
package com.exilant.exility.dataservice;
import com.exilant.exility.common.DataCollection;
import com.exilant.exility.common.ExilityParameters;
import com.exilant.exility.common.ObjectGetSetter;
import com.exilant.exility.common.TaskFailedException;
import org.apache.log4j.Logger;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.HashMap;
/**
* TODO : 1. RS shpuld not go forward and back. We should use ArrayList and convert to Array. 2. set the right property of rs/con
* for optimized read-forward-only operation 3. Date format: How is it taken care of? Is that taken care of in writing SQLs?
*
* Executes a SQL statement and extracs the results into a dataCollection This is a singleton
*/
public class DataExtractor {
private static final Logger LOGGER = Logger.getLogger(DataExtractor.class);
private static DataExtractor singletonInstance;
// private static Connection con;
public static DataExtractor getExtractor() {
if (singletonInstance == null)
singletonInstance = new DataExtractor();
// con = DBHandler.getConnection();
return singletonInstance;
}
private DataExtractor() {
super();
}
public void extract(final String sql,
final String gridName,
final DataCollection dc,
final Connection con,
final boolean errorOnNoData,
final boolean addColumnHeading,
final String prefix) throws TaskFailedException {
if (LOGGER.isInfoEnabled())
LOGGER.info(sql + "sqllll");
if (sql == null || sql.length() == 0)
return;
// temp code to test when database is not available
if (ExilityParameters.logSQLs)
{
int i = dc.getInt("sqlCount");
i++;
dc.addValue("sqlCount", i);
/*
* changed in egf dc.addValue("sql" + i, sql);
*/
}
if (null == con)
return;
int rowCount = 0;
int columnCount = 0;
ResultSetMetaData metaData = null;
String[][] dataValues = null;
try
{
final PreparedStatement pststement = con.prepareStatement(sql, ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_READ_ONLY);
ResultSet rs = null;
String[] columnNames = null;
try {
rs = pststement.executeQuery();
metaData = rs.getMetaData();
columnCount = metaData.getColumnCount();// Gets the Column Count in the ResultSet
columnNames = new String[columnCount];
} catch (final Exception e) {
LOGGER.error("Exception while analysing Result set in extract", e);
return;
}
for (int m = 0; m < columnCount; m++)
columnNames[m] = prefix + metaData.getColumnName(m + 1);
if (null == gridName || gridName.length() == 0)
try {
if (rs.next())
for (int m = 0; m < columnCount; m++) {
String mText = rs.getString(m + 1);
if (mText == null)
mText = "";
if (mText.indexOf("\r") > 0) {
mText = mText.replaceAll("\r", " ");
mText = mText.replaceAll("\n", " ");
mText = mText.replaceAll("\f", " ");
}
dc.addValue(columnNames[m], mText);
}
else
return;
/*
* if(errorOnNoData){ dc.addMessage("exilNoData"); throw new TaskFailedException(); }
*/
} catch (final Exception e) {
LOGGER.error("Exception while analysing Result set in extract", e);
return;
}
else { // result to be put into a grid
rowCount = -1;
try {
rs.next();
rs.getString(1);
} catch (final Exception eee) {
LOGGER.error("Error while analysing Result set in extract", eee);
rowCount = 0;
}
try {
if (rowCount == -1)
{
rs.last();
rowCount = rs.getRow();
rs.beforeFirst(); // brings back the cursor to the start in the ResultSet
}
} catch (final Exception e) {
LOGGER.error("Error while analysing Result set in extract", e);
rowCount = 0;
}
/*
* if (rowCount == 0 && errorOnNoData) { dc.addMessage("exilNoData"); throw new TaskFailedException(); }
*/
int rowid;
if (addColumnHeading) {
dataValues = new String[rowCount + 1][columnCount]; // additional row for column headings
for (int k = 0; k < columnCount; k++)
dataValues[0][k] = columnNames[k];
rowid = 1;
} else {
dataValues = new String[rowCount][columnCount];
rowid = 0;
}
try {
while (rs.next()) {
for (int j = 0; j < columnCount; j++) {// executes number of column times
String mText = rs.getString(j + 1);
if (mText == null)
mText = "";
dataValues[rowid][j] = mText;
}
rowid++; // Row wise increment;
}
} catch (final Exception e) {
LOGGER.error("Inside extract", e);
try {
if (gridName != null && dataValues != null && addColumnHeading)
dc.addGrid(gridName, dataValues);
} catch (final Exception ee) {
LOGGER.error("Error while adding grid in extract", ee);
}
return;
}
dc.addGrid(gridName, dataValues);
}
rs.close();
pststement.close();
} catch (final SQLException e) {
dc.addMessage("exilSQLException", e.getMessage());
LOGGER.error(e.getMessage(), e);
throw new TaskFailedException();
}
return;
}
public HashMap extractIntoMap(final String sql,
final String keyName,
final Class collectionMemberClass) throws TaskFailedException {
// DBHandler handler = DBHandler.getHandler();
/* Connection con = handler.getConnection(); */
final Connection con = null;// This fix is for Phoenix Migration.EgovDatabaseManager.openConnection();
final HashMap map = extractIntoMap(sql, con, keyName, collectionMemberClass);
// This fix is for Phoenix Migration.EgovDatabaseManager.releaseConnection(con,null);
// handler.returnConnection(con);
return map;
}
public HashMap extractIntoMap(final String sql,
final Connection con,
final String keyName,
final Class collectionMemberClass) throws TaskFailedException {
final HashMap map = new HashMap();
int columnCount = 0;
ResultSetMetaData metaData = null;
try
{
final PreparedStatement pststement = con.prepareStatement(sql, ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_READ_ONLY);
final ResultSet rs = pststement.executeQuery();
metaData = rs.getMetaData();
columnCount = metaData.getColumnCount();// Gets the Column Count in the ResultSet
// int keyIndex = rs.findColumn(keyName);
String val = null;
while (rs.next())
{
final Object object = collectionMemberClass.newInstance();
for (int m = 0; m < columnCount; m++) {
String mText = rs.getString(m + 1);
if (mText == null)
mText = "";
if (metaData.getColumnName(m + 1).equalsIgnoreCase(keyName))
val = mText;
ObjectGetSetter.set(object, metaData.getColumnName(m + 1), mText);
}
map.put(val, object);
}
// rs.close();
// ststement.close();
} catch (final SQLException e) {
LOGGER.error("Inside extractIntoMap", e);
// throw new TaskFailedException("sql field " + sql);
return new HashMap();
} catch (final InstantiationException e) {
LOGGER.error("Inside extractIntoMap", e);
throw new TaskFailedException("Object could not be instantiated for " + collectionMemberClass.getName());
} catch (final IllegalAccessException e) {
LOGGER.error("Inside extractIntoMap", e);
throw new TaskFailedException("Object could not be instantiated due to access issues "
+ collectionMemberClass.getName());
}
return map;
}
}