QT Sqlite BLOB类型操作

参考:How to Store and Retrieve Image on SQLite

Sqlite的BLOB类型对应于QT的QByteArray类型。想将数据以二进制的形式存储在Sqlite中,则需要先将数据转成QByteArray。比如存储QString类型数据:

QString strValue = "I'm zqykj!";
QByteArray ba;
QDataStream out(&ba, QIODevice::WriteOnly);
out.setVersion(QDataStream::Qt_5_5);
out << strValue;

通过bindValue的形式将数据写入数据库:

QByteArray ba;
QSqlQuery query;
QString strSql = "update demo set value = :value where name = :name;";
query.prepare(strSql);
query.bindValue(":value", ba);
query.bindValue(":name", "zqykj");
query.exec();

读取二进制数据转换为QString:

QString strValue;
QByteArray ba;
QDataStream in(&ba, QIODevice::ReadOnly);
in.setVersion(QDataStream::Qt_5_5);
in >> strValue;

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