SQLITE update query fails - sql

Question

I am trying to update the table column by appending with new data of QtSQl database. I need to update the column imgpath by appending with new data.
Below is the code, but it always fails, what could be the issue?.
QSqlQuery query(db);
query.exec("create table table1 (id integer primary key autoincrement, time varchar(20), imgpath varchar(20))");
query.exec("insert into table1 values(NULL,'00:15:25','img0.jpg')");
query.exec("insert into table1 values(NULL,'00:15:25','img1.jpg')");
bool up = query.exec("update table1 set imgpath=concat(';newImage.jpg',imgpath) where ID=1");
if(up==false)
qDebug()<<"Update failed";
Update:
Complete code:
QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
db.setDatabaseName("./newDB");
db.open();
QSqlQuery query(db);
query.exec("create table table1 (id integer primary key autoincrement, time varchar(20), imgpath varchar(20))");
query.exec("insert into table1 values(NULL,'00:15:25','img0.jpg')");
query.exec("insert into table1 values(NULL,'00:15:25','img1.jpg')");
//bool up = query.exec("update table1 set imgpath='newimage.jpg',time='' where ID=1");
bool up = query.exec("update table1 set imgpath=concat(';newImage.jpg',imgpath)");
if(up==false){
qDebug()<<"Update failed";
qDebug() << db.lastError();
}
query.exec("SELECT * FROM table1 limit 100");
QVector<QStringList> lst;
while (query.next())
{
QSqlRecord record = query.record();
QStringList tmp;
for(int i=0; i < record.count(); i++)
{
tmp << record.value(i).toString();
}
lst.append(tmp);
}
foreach (const QStringList &var, lst) {
qDebug() << var;
}

Answer 1

SQLite doesn't support the concat function. If you remove
imgpath=concat(';newImage.jpg',imgpath)");
and replace it with standard colName='Value' syntax I'm betting that everything will start working. If you want to append text to the current value you should be able to do it with something like the following syntax:
bool up = query.exec("update table1 set imgpath=';newImage.jpg'||imgpath");