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我怎样才能从表和行指定的记录? 例子:从SQLite获取记录?
这里是DATEBASE(源码)的伪结构:
Row1 Row2 Row3
Line1 Line1 Line1
Line2 Line2 Line2
... ... ...
我想要使用Qt的通过将DATEBASE取得一行记录。 例如,我怎样才能得到Row2->2号线字符串?
我尝试这样做:
QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
db.setDatabaseName("db.db"); //Yes the name of datebase is db.db
if (db.open())
{
QSqlQuery soruAl("SELECT question FROM questions",db);
soruAl.exec();soruAl.first(); //These line does not affect result "QSqlQuery::value: not positioned on a valid record".
qDebug() << soruAl.value(5).toString(); // Here I want to get the 5. line of the question row which is in questions table.
}
else
{
qDebug() << "Error";
}
但只有响应我从调试器得到的是“QSqlQuery ::值:不定位在有效记录”
的DUP http://stackoverflow.com/questions/9000123/qsqlquery-not-positioned-on-a-valid-record – lpapp 2013-10-27 01:36:08