how to open a OCI db connection?

[KillGabio]

hi, i ve tried what u said and it gives me the following error:

QSqlError(12154, "Unable to logon", "ORA-12154: TNS:could not resolve the connect identifier specified")

i found an answer but i cant really understand it..

I solved my problem!
I connect to the database with the client with database name bar.foo and I tried to put that as parameter to QSqlDatabase::setDatabaseName() too. The connection, however, opened when I put there just foo (as in not bar.foo.

So the right values were following:


QSqlDatabase db = QSqlDatabase::addDatabase("QOCI");
db.setHostName("127.0.0.1"); // The TCP/IP of the host goes here
db.setDatabaseName("foo"); // As suggested, the database name goes here :P
db.setPort(1521);
db.setUserName("user");
db.setPassword("pass");

global is my machine... i actually downloaded Oracle 11g Express Edition, SQL Developer to edit the database and Instant Client...the last one I really didnt understand what i have to do with it cause it has no installer.. i can access the database with SQL developer especifying the information of the picture or i can enter via explorer 127.0.0.1 and see the objects (two tables and the row i added)

i ll keep reading thanks a lot and i appreciate any help

[KillGabio]

SOLVED

to all who try to connect to an Oracle database created with Express Edition this is howto:

db = QSqlDatabase::addDatabase ("QOCI");
    db.setDatabaseName("XE");
    db.setUserName("admin");
    db.setPassword("killllll");
    db.setHostName("127.0.0.1");
    db.setPort(1521);
    if (db.open ()){
        QSqlQuery query (db);
        if( !query.exec("SELECT * FROM TABLE_PRODUCTOS") )
            qDebug() << query.lastError();
          else
            qDebug( "Selected!" );
        return true;}
    else{
        QMessageBox::critical(0, qApp->tr("Cannot open database"),
                                 qApp->tr("Unable to establish a database connection.\n"
                                          "Click Cancel to exit."), QMessageBox::Cancel);
        qDebug() << db.lastError ();
        return false;
        }

db = QSqlDatabase::addDatabase ("QOCI");
    db.setDatabaseName("XE");
    db.setUserName("admin");
    db.setPassword("killllll");
    db.setHostName("127.0.0.1");
    db.setPort(1521);
    if (db.open ()){
        QSqlQuery query (db);
        if( !query.exec("SELECT * FROM TABLE_PRODUCTOS") )
            qDebug() << query.lastError();
          else
            qDebug( "Selected!" );
        return true;}
    else{
        QMessageBox::critical(0, qApp->tr("Cannot open database"),
                                 qApp->tr("Unable to establish a database connection.\n"
                                          "Click Cancel to exit."), QMessageBox::Cancel);
        qDebug() << db.lastError ();
        return false;
        }

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in the Database name goes the SID not the name you gave it to the database, for the host you can either put LOCALHOST or the TCPIP dir (127.0.0.1)
the user and pass are the ones you create at the workespace and in the setPort you indicate the listener port, i think for all Oracle servers is 1521
hope this is helpfull to someone

greetings!

[thaihoangluu]

SOLVED

to all who try to connect to an Oracle database created with Express Edition this is howto:

db = QSqlDatabase::addDatabase ("QOCI");
    db.setDatabaseName("XE");
    db.setUserName("admin");
    db.setPassword("killllll");
    db.setHostName("127.0.0.1");
    db.setPort(1521);
    if (db.open ()){
        QSqlQuery query (db);
        if( !query.exec("SELECT * FROM TABLE_PRODUCTOS") )
            qDebug() << query.lastError();
          else
            qDebug( "Selected!" );
        return true;}
    else{
        QMessageBox::critical(0, qApp->tr("Cannot open database"),
                                 qApp->tr("Unable to establish a database connection.\n"
                                          "Click Cancel to exit."), QMessageBox::Cancel);
        qDebug() << db.lastError ();
        return false;
        }

db = QSqlDatabase::addDatabase ("QOCI");
    db.setDatabaseName("XE");
    db.setUserName("admin");
    db.setPassword("killllll");
    db.setHostName("127.0.0.1");
    db.setPort(1521);
    if (db.open ()){
        QSqlQuery query (db);
        if( !query.exec("SELECT * FROM TABLE_PRODUCTOS") )
            qDebug() << query.lastError();
          else
            qDebug( "Selected!" );
        return true;}
    else{
        QMessageBox::critical(0, qApp->tr("Cannot open database"),
                                 qApp->tr("Unable to establish a database connection.\n"
                                          "Click Cancel to exit."), QMessageBox::Cancel);
        qDebug() << db.lastError ();
        return false;
        }

To copy to clipboard, switch view to plain text mode 

in the Database name goes the SID not the name you gave it to the database, for the host you can either put LOCALHOST or the TCPIP dir (127.0.0.1)
the user and pass are the ones you create at the workespace and in the setPort you indicate the listener port, i think for all Oracle servers is 1521
hope this is helpfull to someone

greetings!

How can download OCI Driver ?
I not found link download
Please help me.