Question

你好我在Qt C ++ / SQLite中有一个小应用程序在Qt 5.6.2上工作得很好我升级到Qt 5.9.1并且问题是当我尝试VACUUM我的数据库时我得到运行时错误请注意，所有查询都可以正常工作除了真空:(并且它在Qt 5.6.2上可以正常工作

相关代码

QString msql::sqlExec(QString sqlCmd)
{
    query->clear();
    QString value;

    if (!query->exec(sqlCmd))
    {
        mDebug() << sqlCmd << query->lastError().text();
    }
    else if (!query->first())
    {
        //mDebug() << "not valid query: " << sqlCmd << query->isSelect();
        mDebug() << query->lastError().text();
        return "";
    }
    else
    {
        value = query->value(0).toString();
    }
    query->finish();
    return value;
}

和

bool msql::vacuum()
{
    QStringList tables = db.tables(QSql::AllTables);
    int x = 1;
    int y = tables.count();
    foreach (QString table, tables)
    {
        sqlExec(QString("VACUUM `%1`").arg(table));
        emit progress(QString("Optimizing table %1/%2:%3").arg(x).arg(y).arg(table));
        if (killLoopFlag_)
            return false;
        x++;
    }
    return true;
}

我收到此错误

Debug:[2017-07-17 02:51 AM] "VACUUM `visits`" "unknown database `visits` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `investigations`" "unknown database `investigations` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `credentials`" "unknown database `credentials` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `siblings`" "unknown database `siblings` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `surgicalNotes`" "unknown database `surgicalNotes` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `metadata`" "unknown database `metadata` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `drugs`" "unknown database `drugs` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `deceased`" "unknown database `deceased` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `visitPrices`" "unknown database `visitPrices` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `conditions`" "unknown database `conditions` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `conditions_patients`" "unknown database `conditions_patients` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `perinatal`" "unknown database `perinatal` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `development`" "unknown database `development` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `obgyn`" "unknown database `obgyn` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `patients`" "unknown database `patients` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `agendaView`" "unknown database `agendaView` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `registerView`" "unknown database `registerView` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `sqlite_master`" "unknown database `sqlite_master` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `SERVICES`" "unknown database `SERVICES` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `defaultDoses`" "unknown database `defaultDoses` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `allergies`" "unknown database `allergies` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `complaints`" "unknown database `complaints` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `diagnoses`" "unknown database `diagnoses` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `dictionary`" "unknown database `dictionary` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `doses`" "unknown database `doses` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `surgeries`" "unknown database `surgeries` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `investigations`" "unknown database `investigations` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `jobs`" "unknown database `jobs` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `places`" "unknown database `places` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `placeOfBirth`" "unknown database `placeOfBirth` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `expander`" "unknown database `expander` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `drugs`" "unknown database `drugs` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `diet`" "unknown database `diet` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `sqlite_master`" "unknown database `sqlite_master` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `drugsIndex`" "unknown database `drugsIndex` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `metadata`" "unknown database `metadata` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString) 
Debug:[2017-07-17 02:51 AM] "VACUUM `sqlite_master`" "unknown database `sqlite_master` Unable to execute statement" (..\qtemr\msql.cpp:16) class QString __thiscall msql::sqlExec(class QString)

Answer 1

VACUUM不适用于特定表，而是适用于整个数据库。您曾经附加了VACUUM命令忽略的表名。自从您升级Qt后，您还升级了SQLite驱动程序。来自SQLite site：

兼容性警告：版本3.15.0（2016-10-14）中添加了真空附加数据库的功能。在此之前，将静默忽略添加到VACUUM语句的模式名称，并将“主”模式抽真空。

“Schema-name”这里是数据库的名称。所以你可以保留一个字符串

sqlExec("VACUUM");

Qt 5.9.1 SQLite真空中的错误？

相关代码

1 个答案: