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Support #1335

closed

Wt database search - only first hit displayed

Added by Anonymous over 12 years ago. Updated over 12 years ago.

Status:
Closed
Priority:
Normal
Assignee:
Target version:
Start date:
06/21/2012
Due date:
% Done:

0%

Estimated time:

Description

Dear developers, experts,

I'm trying to create a function to perform a search in a given database.

The code attached works, compiling without problems.

The strange thing of this situation is the number of results(N) is correct, but when I'd like to print out the results, only the first hit is displayed N times.

Could you give me some advice, where could be the mistake?

Thank you in advance,

Daniel


My code is:

#ifndef Search_H

#define Search_H

#include

#include

#include

#include

#include

#include

#include

using namespace Wt;

using namespace std;

namespace dbo = Wt::Dbo;

template

class Search {

public:

Search( const char *table_name ) {

session = new dbo::Session();

connection = new dbo::backend::Sqlite3( table_name );

connection->setProperty("show-queries","true");

session->setConnection( *connection );

session->mapClass(table_name);

}

~Search() {

delete connection;

delete session;

}

vector<Wt::Dbo::ptr > search( ) {

unsigned int i=0;

string query;

cerr << "Search in database..." << endl;

dbo::Transaction transaction(*session);

Wt::Dbo::collection< Wt::Dbo::ptr > tCollection = session->find();

vector<Wt::Dbo::ptr > tVector(tCollection.begin(), tCollection.end());

for (unsigned int i=0; i<tVector.size(); i) {

cerr << tVector[i]code << \" \" << tVector[i]>chainid << endl;

return tVector;

}

protected:

dbo::Session *session;

dbo::backend::Sqlite3 *connection;

};

#endif //Search_H

Actions #1

Updated by Koen Deforche over 12 years ago

  • Assignee set to Koen Deforche

Hey,

Could it be you're simply missing the persist() method and thus you get only default constructed objects ?

Regards,

koen

Actions #2

Updated by Koen Deforche over 12 years ago

  • Status changed from New to Feedback
Actions #3

Updated by Daniel Kozma over 12 years ago

Dear Koen,

Thank you for your answer.

I've got persist() function, but not in Search.h. My persist() function is in Hit.h.

I use Hit class in template.

I'd like to call the search function from a context like:

    Search<Hit> *search = new Search<Hit>("pdbtm");
    Hits hits = search->search( params );
    cerr << "search results count: " <<  hits.size();
    for (unsigned int i=0; i<hits.size(); i++) 
        cerr << hits[i]->code << " " << hits[i]->chainid << endl;

And my Hit.h, which contains the persist function and define the data structure is the following:

Type 'Hits' is defined end of this file also.

#ifndef __Hit_H__
#define __Hit_H__

#include <Wt/Dbo/Dbo>
#include <Wt/Dbo/Session>
#include <Wt/Dbo/Transaction>
#include <Wt/Dbo/backend/Sqlite3>
#include <Wt/Dbo/Types>
#include <Wt/Dbo/WtSqlTraits>

#include <time.h>

using namespace Wt;
using namespace std;
namespace dbo = Wt::Dbo;


class Hit : public dbo::Dbo<Hit> {
    public:
        Hit() {
        };

        ~Hit() {
        }

        template<class Action>
        void persist(Action& a) {
            Wt::Dbo::field(a, code, "code");
            Wt::Dbo::field(a, chainid, "chainid");
        }


        string code;
        string chainid;

};

typedef Wt::Dbo::collection< Wt::Dbo::ptr<Hit> > HitCollection;
typedef vector<Wt::Dbo::ptr<Hit> >  Hits;

#endif

Thank you for your help in advance!

Best regards,

Daniel

Actions #4

Updated by Koen Deforche over 12 years ago

Hey,

Your code seems fine. I can only imagine that there is something wrong with the data, e.g. the 'id' column does not have unique values ? [that shouldn't be possible for a column that is primary key but Sqlite3 has some quirks in that area] Does the data look correctly when doing the query in sqlite3 directly ?

Regards,

koen

Actions #5

Updated by Daniel Kozma over 12 years ago

Dear Koen,

I've checked with SQLite Database Browser, search works well for the same query:

select * from pdbtm where code = '2bl2'

The data and the database seem correct.

Regards,

Daniel

Actions #6

Updated by Daniel Kozma over 12 years ago

Dear Koen,

I've found the solution.

I did not have the two auxilary column in my databese: ID, VERSION.

So, you had right, the issue is caused by the wrong structure of my database.

Thank you very much!

Best regards,

Daniel

Actions #7

Updated by Koen Deforche over 12 years ago

  • Status changed from Feedback to Resolved
Actions #8

Updated by Koen Deforche over 12 years ago

  • Status changed from Resolved to Closed
  • Target version set to 3.2.2

Released in Wt 3.2.2

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