[SOLVED] sql driver plugins not loadded

[CKurdu]

Hi everybody.

I got following lines and program can not connect mysql database.

---

QSqlDatabase: QMYSQL driver not loaded
QSqlDatabase: available drivers:

I entered the command "ldd libqsqlmysql.so"

---

linux-vdso.so.1 (0x00007fff9b5fc000)
libmysqlclient.so.18 => /usr/lib64/libmysqlclient.so.18 (0x00007f2c436c1000)
libQt5Sql.so.5 => /home/ckurdu/bin/Qt5.4.1/5.4/gcc_64/lib/libQt5Sql.so.5 (0x00007f2c43480000)
libQt5Core.so.5 => /home/ckurdu/bin/Qt5.4.1/5.4/gcc_64/lib/libQt5Core.so.5 (0x00007f2c42d44000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f2c42b27000)
libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x00007f2c4281e000)
libm.so.6 => /lib64/libm.so.6 (0x00007f2c4251d000)
libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f2c42306000)
libc.so.6 => /lib64/libc.so.6 (0x00007f2c41f5e000)
libz.so.1 => /lib64/libz.so.1 (0x00007f2c41d48000)
libssl.so.1.0.0 => /lib64/libssl.so.1.0.0 (0x00007f2c41ae1000)
libcrypto.so.1.0.0 => /lib64/libcrypto.so.1.0.0 (0x00007f2c416bd000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f2c414b9000)
libicui18n.so.53 => /home/ckurdu/bin/Qt5.4.1/5.4/gcc_64/lib/libicui18n.so.53 (0x00007f2c4106d000)
libicuuc.so.53 => /home/ckurdu/bin/Qt5.4.1/5.4/gcc_64/lib/libicuuc.so.53 (0x00007f2c40ce1000)
libgthread-2.0.so.0 => /usr/lib64/libgthread-2.0.so.0 (0x00007f2c40adf000)
librt.so.1 => /lib64/librt.so.1 (0x00007f2c408d7000)
libglib-2.0.so.0 => /usr/lib64/libglib-2.0.so.0 (0x00007f2c405c8000)
/lib64/ld-linux-x86-64.so.2 (0x00007f2c43e78000)
libicudata.so.53 => /home/ckurdu/bin/Qt5.4.1/5.4/gcc_64/lib/libicudata.so.53 (0x00007f2c3ef40000)
libpcre.so.1 => /usr/lib64/libpcre.so.1 (0x00007f2c3ecd5000)

So there is no unfounded library file.

[SGaist]

Hi,

Did you check the error message returned by QSqlDatabase ?

[CKurdu]

---

this->dbo->setHostName(hostname);
this->dbo->setDatabaseName(databasename);
this->dbo->setUserName(username);
this->dbo->setPassword(password);
if (!this->dbo->open()) {
qDebug()<<"Database Error"<<this->dbo->lastError().text()<<endl;
return false;
}

I got "Driver not loaded Driver not loaded" error.
Why is it twice?

[SGaist]

Looks like you are doing something unusual.

QSqlDatabase's initialization should rather look like:

QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL")
db.setHostname(hostname);
etc.

How are you doing it ?

Another thing that is puzzling is that your plugin list is empty.
What does
qDebug() << QSqlDatabase::drivers();
return ?

[CKurdu]

This is the full code of creation of database connection.

---

bool Factory::createConnection()
{
qDebug()<<"Connection has been creating"<<endl;
this->dbo = new QSqlDatabase(QSqlDatabase::addDatabase("QMYSQL"));
this->setting->beginGroup("database");
QString hostname = this->setting->value("host").toString();
QString username = this->setting->value("user").toString();
QString password = this->setting->value("password").toString();
QString databasename = this->setting->value("databasename").toString();

    qDebug()<<"password : "<<password<<endl;
    this->dbo->setHostName(hostname);
    this->dbo->setDatabaseName(databasename);
    this->dbo->setUserName(username);
    this->dbo->setPassword(password);
    if (!this->dbo->open()) {
       qDebug() <<"Available Drivers : " << QSqlDatabase::drivers()<<endl;
        qDebug()<<"Database Error : "<<this->dbo->lastError().text()<<endl;
        return false;
    }
    qDebug()<<"Database connected"<<endl;
    return true;

}

---

Output of this program.

Plugins location "/home/ckurdu/bin/Qt_5_4.1/5.4/gcc_64/plugins"

Plugins Prefixpath "/home/ckurdu/bin/Qt_5_4.1/5.4/gcc_64"

Factory loaded

Connection has been creating

QSqlDatabase: QMYSQL driver not loaded
QSqlDatabase: available drivers:
password : "wqerqwefas"

**Available Drivers : () **
**Database Error : "Driver not loaded Driver not loaded" **

Module not loaded

"The shared library was not found."

Module not loaded

"The shared library was not found."

[SGaist]

Did you build Qt yourself ?

[CKurdu]

No
I only built myself libqsqlmysql.so. Also I installed qt 5.4.1 3 hours ago.
My os is Opensuse 13.2 64 bit.

[SGaist]

Might sound silly, but did you also installed it ? I'm still puzzled by that empty list of drivers...

[CKurdu]

I am so sorry. I found the problem. I made a stupid error. in my qt.conf file I wrote wrong path for prefix. So program couldn't have found the plugin location.

Thank you very much.

[SGaist]

Are you doing a deployment ?

[CKurdu]

Actually I have a main program that has already deployed for my desktop computer and I am programming a module for it. I copied the program from my desktop to my laptop than I continued to develop my module where I left off. But I forget to change "my.conf" file for the main program.

Thank you.

[SGaist]

Wouldn't it be simpler also for debugging to build both ?

In any case, since you have it working now, please mark the thread as solved so other forum users may know a solution has been found :)