QT, MySQL and BLOB

dnasta

Hello

Please! Help me with this!

I have QT 2010.05 and MySQL 5.1.50 (with the corresponding sources and libs) on XP.

I'm trying to insert an image into a BLOB field in a table like this:

@CREATE TABLE contenido (
idx_contenido int(11) NOT NULL AUTO_INCREMENT,
nombre varchar(256) COLLATE latin1_spanish_ci DEFAULT NULL,
contenido blob,
PRIMARY KEY (idx_contenido)
) ENGINE=InnoDB;@

compiled the driver for MySQL with these commands:

cd %QT_DIR%\src\plugins\sqldrivers\mysql
qmake -o Makefile "INCLUDEPATH+=E:\MySQL51\include" "LIBS+=E:\MySQL51\lib\opt\libmysql.lib" mysql.pro
nmake

These commands do not generate any error, qmake generates only three warnings:

WARNING: (internal):1: Unescaped backslashes are deprecated.
WARNING: (internal):1: Unescaped backslashes are deprecated.
WARNING: (internal):1: Unescaped backslashes are deprecated.

When I run the program generates this error:

Using unsupported buffer type: 64 (parameter: 1) QMYSQL3: Unable to bind value

I have this code:

@class Principal : public QWidget
{
Q_OBJECT

public:
explicit Principal(QWidget *parent = 0);
~Principal();

private:
Ui::Principal *ui;

QSqlDatabase bd;

private slots:
void on_btnBlob_clicked();
void on_btnSalir_clicked();
};

Principal::Principal(QWidget *parent) :
QWidget(parent),
ui(new Ui::Principal)
{
ui->setupUi(this);

bd = QSqlDatabase::addDatabase("QMYSQL");
bd.setHostName("localhost");
bd.setPort(3306);

}

void Principal::on_btnBlob_clicked()
{
{
bd.setDatabaseName("pruebasqt");
bd.setUserName("qt");
bd.setPassword("qt");

    if (!bd.open())
    {
        QSqlError bderror = bd.lastError();
        ui->text->append(bderror.text());
    }
    bd.close();
}

QString fileName = "C:/Factura01.jpg";

QByteArray ba;
QFile f(fileName);
if(f.open(QIODevice::ReadOnly))
{
    ba = f.readAll();
    f.close();
}

QSqlDatabase::database().transaction();
QSqlQuery query;
query.prepare("INSERT INTO contenido (nombre, contenido) VALUES (\"Factura01.jpg\", :IMAGE)" );
query.bindValue(":IMAGE", ba);
query.exec&#40;&#41;;
if( query.lastError().isValid())
{
    ui->text->append(query.lastError().text());
    QSqlDatabase::database().rollback();
}
else
    QSqlDatabase::database().commit();

QSqlDatabase::removeDatabase("pruebasqt");

}@

Please, helpme.

Thank you very much for your help

Regards,

Dario

did this line return true?

@
query.prepare("INSERT INTO contenido (nombre, contenido) VALUES ("Factura01.jpg", :IMAGE)" );
@

Try this,
@
query.prepare("INSERT INTO contenido (nombre, contenido) VALUES (:NAME, :IMAGE)" );
query.bindValue(":NAME", "Factura01.jpg");
query.bindValue(":IMAGE", ba);
@

dnasta

Thanks for reply.

@

query.prepare("INSERT INTO contenido (nombre, contenido) VALUES ("Factura01.jpg", :IMAGE)" );

@

returns true but...

@

query.prepare("INSERT INTO contenido (nombre, contenido) VALUES (:NAME, :IMAGE)" );
query.bindValue(":NAME", "Factura01.jpg");
query.bindValue(":IMAGE", ba);

@

also generates the same error

Using unsupported buffer type: 64 (parameter: 1) QMYSQL3: Unable to bind value

Note that the error says QMYSQL3, indicates that QT are using MySQL 3 driver (which does not support BLOB) although I compile the QT driver with MySQL 5

Regards,

Darío

Dii

Hmmm in line 46, why do you close the database connection? Probably it should be in the if statement starts at line 41. And you should give a 'return;' there too, if the database open is failed. Or am I seeing something wrong?

BTW, in
@query.prepare("INSERT INTO contenido (nombre, contenido) VALUES ("Factura01.jpg", :IMAGE)" );@

You can do it like this, more beautiful without the backslashes:

@query.prepare("INSERT INTO contenido (nombre, contenido) VALUES ('Factura01.jpg', :IMAGE)" );@

.. at my opinion ;)

dnasta

Same error with 'Factura01.jpg' and without bd.close(); in line 45

Dii

I've tried to reproduce your problem, but without any success. I have Qt 4.6.3 and MySQL 5.1.50, though I'm running them on linux. I have no problem with the BLOB type at all. Also "buffer type: 64" doesn't bring up anything in google, except your posts. Very strange.

I haven't compiled the mysql driver in windows for a very long time, maybe the problem is somewhere there. Sorry I couldn't help.

robi

Though i am new in qt platform and also the post has been given by you many days ago,then i can probably give you the solution...here

don't use backslashes instead of front slashes in "INCLUDEPATH" "LIBS" use like below:
cd %QTDIR%\src\plugins\sqldrivers\mysql
qmake "INCLUDEPATH+=C:/MySQL/include" "LIBS+=C:/MYSQL/MySQL Server <version>/lib/opt/libmysql.lib" mysql.pro
mingw32-make ........
this will remove this problem
WARNING: (internal):1: Unescaped backslashes are deprecated.
WARNING: (internal):1: Unescaped backslashes are deprecated.
WARNING: (internal):1: Unescaped backslashes are deprecated.
and you also need to notice that you put correct libmysql.dll from mysql that is u used for build with qt.........if u follow this things you can get rid of this problem.....best of luck
sorry for my bad english.....

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QT, MySQL and BLOB