使用数据库中的图片

//连接DB
QSqlDatabase db = QSqlDatabase::addDatabase("QOCI");
// QSqlDatabase db = QSqlDatabase::addDatabase("QODBC"); // cannot connect
db.setHostName("192.168.0.123");
db.setDatabaseName("ORCL");
db.setUserName("testuser");
db.setPassword("admin");
db.setPort(1521);

if (!db.open())
{
printf("打开失败n");
}
else
{
printf("打开成功n");

QSqlQuery query;

//do insert

//blob
QByteArray data;
QString path = "F:/FtpSet/Ftp02/1111111111.JPG";
QFile* file=new QFile(path); //fileName为二进制数据文件名
file->open(QIODevice::ReadOnly);
data = file->readAll();
file->close();
QVariant var(data);

QString sql = "insert into qttest(id,field_blob) values(?,?)";
query.prepare(sql);
query.addBindValue(100);
query.addBindValue(var);
if(!query.exec())
{
printf("[insert error]");
printf(query.lastError().text().toLocal8Bit().data());
printf("n");
}
else
{
printf("[insert ok]n");
}

还有一种获取BLOB数据入参的方法在Mysql中运行正常，Oracle中能运行，代码如下：

QByteArray ba;
QBuffer buffer(&ba);
buffer.open(QIODevice::ReadWrite);
QPixmap pixmap(path);
pixmap.save(&buffer,"JPG");
QVariant variant(ba);