Parameter count mismatch in Qtsql - c++

Question

I'm trying to insert data into a QtSql database, but I keep getting the error:
"Parameter count mismatch"
What could be what I'm doing wrong?
#include <QtSql>
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
qDebug() << QSqlDatabase::drivers();
QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
db.setHostName("LOCALHOST");
db.setDatabaseName("people");
db.setUserName("root");
db.setPassword("");
if(db.open()) {
qDebug() << "Opened!";
QSqlQuery query;
query.prepare("INSERT INTO person (id, forename, surname) "
"VALUES (:id, :forename, :surname)");
query.bindValue(":id", 1001);
query.bindValue(":forename", "Bart");
query.bindValue(":surname", "Simpson");
query.exec();
if( !query.exec() )
qDebug() << query.lastError().text();
else
qDebug( "Inserted!" );
db.close();
} else {
qDebug() << "Not opened";
}
}

Answer 1

You don't have a table named person in the database. You are trying to insert values into a table that does not exist.
I think that the error message is wrong. But anyway, I added a CREATE statement to your code, so that the table is created before the INSERT statement is executed:
#include <QtSql>
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
db.setDatabaseName(":memory:");
if(!db.open()){
qDebug() << "Not opened";
return 1;
}
qDebug() << "Opened!";
QSqlQuery query;
//CREATE the table before executing the INSERT statement
query.exec("CREATE TABLE person (id INTEGER, forename TEXT, surname TEXT);");
query.prepare("INSERT INTO person (id, forename, surname) "
"VALUES (:id, :forename, :surname)");
query.bindValue(":id", 1001);
query.bindValue(":forename", "Bart");
query.bindValue(":surname", "Simpson");
if( !query.exec() )
qDebug() << query.lastError().text();
else
qDebug( "Inserted!" );
return 0;
}
This prints Inserted! now. But if I comment out the CREATE statement line I get the same error in your question:
" Parameter count mismatch"