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// export.cpp
/**
* Copyright (C) 2008 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "stdafx.h"
#include "client/dbclient.h"
#include "db/json.h"
#include "Tool.h"
#include <fstream>
#include <iostream>
#include <boost/program_options.hpp>
#include <pcrecpp.h>
using namespace mongo;
namespace po = boost::program_options;
class Export : public Tool {
public:
Export() : Tool( "export" ){
add_options()
("query,q" , po::value<string>() , "query filter" )
("fields,f" , po::value<string>() , "comma seperated list of field names e.g. -f=name,age " )
("csv","export to csv instead of json")
("out,o", po::value<string>(), "output file; if not specified, stdout is used")
;
}
int run(){
string ns;
const bool csv = hasParam( "csv" );
ostream *outPtr = &cout;
string outfile = getParam( "out" );
if ( hasParam( "out" ) )
outPtr = new ofstream( outfile.c_str() );
ostream &out = *outPtr;
BSONObj * fieldsToReturn = 0;
BSONObj realFieldsToReturn;
vector<string> fields;
try {
ns = getNS();
} catch (...) {
printHelp(cerr);
return 1;
}
if ( hasParam( "fields" ) ){
BSONObjBuilder b;
pcrecpp::StringPiece input( getParam( "fields" ) );
string f;
pcrecpp::RE re("(\\w+),?" );
while ( re.Consume( &input, &f ) ){
fields.push_back( f );
b.append( f.c_str() , 1 );
}
realFieldsToReturn = b.obj();
fieldsToReturn = &realFieldsToReturn;
}
if ( csv && fields.size() == 0 ){
cerr << "csv mode requires a field list" << endl;
return -1;
}
auto_ptr<DBClientCursor> cursor = conn().query( ns.c_str() , getParam( "query" , "" ) , 0 , 0 , fieldsToReturn , Option_SlaveOk );
if ( csv ){
for ( vector<string>::iterator i=fields.begin(); i != fields.end(); i++ ){
if ( i != fields.begin() )
out << ",";
out << *i;
}
out << endl;
}
while ( cursor->more() ) {
BSONObj obj = cursor->next();
if ( csv ){
for ( vector<string>::iterator i=fields.begin(); i != fields.end(); i++ ){
if ( i != fields.begin() )
out << ",";
const BSONElement & e = obj[i->c_str()];
if ( ! e.eoo() )
out << e.jsonString( TenGen , false );
}
out << endl;
}
else {
out << obj.jsonString() << endl;
}
}
return 0;
}
};
int main( int argc , char ** argv ) {
Export e;
return e.main( argc , argv );
}
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