//! [0]
QSqlQuery q;
q.prepare("insert into test (i1, i2, s) values (?, ?, ?)");

QVariantList col1;
QVariantList col2;
QVariantList col3;

col1 << 1 << 3;
col2 << 2 << 4;
col3 << "hello" << "world";

q.bindValue(0, col1);
q.bindValue(1, col2);
q.bindValue(2, col3);

if (!q.execBatch())
    qDebug() << q.lastError();
//! [0]


//! [1]
QSqlQuery query = ...
QVariant v = query.result()->handle();
if (v.isValid() && qstrcmp(v.typeName(), "sqlite3_stmt*")) {
    // v.data() returns a pointer to the handle
    sqlite3_stmt *handle = *static_cast<sqlite3_stmt **>(v.data());
    if (handle != 0) { // check that it is not NULL
        ...
    }
}
//! [1]


//! [2]
if (v.typeName() == "PGresult*") {
    PGresult *handle = *static_cast<PGresult **>(v.data());
    if (handle != 0) ...
}

if (v.typeName() == "MYSQL_STMT*") {
    MYSQL_STMT *handle = *static_cast<MYSQL_STMT **>(v.data());
    if (handle != 0) ...
}
//! [2]