<![CDATA[Select data from QSqlite in thread]]>I have used the thread to read data from QSqlite database

void RandomWalk::run()
{
    qDebug("Thread id inside run %d", (int)QThread::currentThreadId());

    QSqlQuery  qry(db);
    qry.prepare( "SELECT * FROM  TEST  ");
      if( !qry.exec() )
        qDebug() <<"here"<< qry.lastError();
      else
      {
        qDebug( "Selected!" );

        QSqlRecord rec = qry.record();
       

       for( int r=0; qry.next(); r++ ){
          qDebug() << QString( "Row %1, %2: %3" ).arg( r ).arg( rec.fieldName(0) ).arg( qry.value(0).toString() );

            qDebug() << QString( "Row %1, %2: %3" ).arg( r ).arg( rec.fieldName(1) ).arg( qry.value(1).toString() );

          }
      }
}

I don't use sleep in thread and it starts with : thread->start();
the output like :

"Row 0, Field1: 77"
"Row 0, Field2: 87"
"Row 1, Field1: 77"
"Row 1, Field2: 87"
"Row 2, Field1: 77"
"Row 2, Field2: 87"
"Row 3, Field1: 76"
"Row 3, Field2: 86"
"Row 4, Field1: 77"








"Row 4, Field2: 87"
"Row 5, Field1: 77"
"Row 5, Field2: 87"
"Row 6, Field1: 77"
"Row 6, Field2: 87"
"Row 7, Field1: 77"
"Row 7, Field2: 87"






....

Why is space between output data?Why is not read data continuous?

]]>https://forum.qt.io/topic/105350/select-data-from-qsqlite-in-threadRSS for NodeThu, 23 Apr 2026 23:35:45 GMTThu, 25 Jul 2019 21:12:22 GMT60<![CDATA[Reply to Select data from QSqlite in thread on Fri, 26 Jul 2019 13:06:23 GMT]]>@isan
As the others say, you might have non-printing bytes in the column in the database. For your debug line try something like:

qry.value(0).toString().toLatin1().toHex()

in order to see what is actually in there.

]]>https://forum.qt.io/post/543072https://forum.qt.io/post/543072Fri, 26 Jul 2019 13:06:23 GMT<![CDATA[Reply to Select data from QSqlite in thread on Fri, 26 Jul 2019 04:28:30 GMT]]>@isan Maybe you have an entry in the database containing many newlines at the end?
Use the debugger to see what data you get in each line.
Also, these empty lines could be from another (main for example) thread.

]]>https://forum.qt.io/post/542992https://forum.qt.io/post/542992Fri, 26 Jul 2019 04:28:30 GMT<![CDATA[Reply to Select data from QSqlite in thread on Thu, 25 Jul 2019 21:27:19 GMT]]>Each time you call qdebug, you get a new line printed on the console.

]]>https://forum.qt.io/post/542981https://forum.qt.io/post/542981Thu, 25 Jul 2019 21:27:19 GMT<![CDATA[Reply to Select data from QSqlite in thread on Thu, 25 Jul 2019 21:19:07 GMT]]>@SGaist Hi , the space between Rows 4
The output shouldn't continuous? like this:

"Row 0, Field1: 77"
"Row 0, Field2: 87"
"Row 1, Field1: 77"
"Row 1, Field2: 87"
"Row 2, Field1: 77"
"Row 2, Field2: 87"
"Row 3, Field1: 76"
"Row 3, Field2: 86"
"Row 4, Field1: 77"
"Row 4, Field2: 87"
"Row 5, Field1: 77"
"Row 5, Field2: 87"
"Row 6, Field1: 77"
"Row 6, Field2: 87"
"Row 7, Field1: 77"
"Row 7, Field2: 87"
....
]]>https://forum.qt.io/post/542978https://forum.qt.io/post/542978Thu, 25 Jul 2019 21:19:07 GMT<![CDATA[Reply to Select data from QSqlite in thread on Thu, 25 Jul 2019 21:14:49 GMT]]>Hi,

What do you mean by space ?
What is the expected output ?

]]>https://forum.qt.io/post/542976https://forum.qt.io/post/542976Thu, 25 Jul 2019 21:14:49 GMT