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我想更新圖像作爲blob類型從數據庫從QImage到數據庫。我用下面的代碼做到這一點:更新圖像字段作爲blob類型到數據庫在QT C++
int reportingID = 10;
// props is QMap<QString, QVariant> fill with string and QImage as a QVariant
QSqlQuery sqlQueryImage(_db);
bool ok = sqlQueryImage.prepare("UPDATE reporting SET leftIcon = iconL WHERE id = 'ID'"
"VALUES (:iconL,:ID)");
qDebug() << "text: " << ok << endl;
sqlQueryImage.bindValue(":iconL", QVariant(props["left_icon"].toByteArray()));
sqlQueryImage.bindValue(":ID", QVariant(reportingID));
我以前上的代碼更新數據庫的QString和它的工作正確的,但它並沒有更新的圖像工作。我不知道我的問題在哪裏!
非常奇怪的更新語句。也許它應該像''UPDATE reporting SET leftIcon =':iconL'WHERE id =':ID'「''? – 2016-11-24 13:03:20