Question

新手求问，Qt中操作sqlite数据库报错,No query Unable to fetch row

if(QSqlDatabase::contains("qt_sql_default_connection"))
db = QSqlDatabase::database("qt_sql_default_connection");
else
db = QSqlDatabase::addDatabase("QSQLITE");

db.setDatabaseName("qq.db");
if(!db.open())
{
QMessageBox::warning(NULL, "Open DB", tr("Open DB error:%1").arg(db.lastError().text()));
}

QSqlQuery query;
query.prepare("create table user(id varchar(15) not null primary key,passwd varchar(15) not null,nickname varchar(15) null)");
if( !query.exec() )
{
QMessageBox::warning(NULL, "Create Table", tr("Create Table error:%1").arg(query.lastError().text()));
}
我先打开数据库，没有问题，就是运行到新建表的时候报错
提示：Create Table error:No query Unable to fetch row

Answer 1

setInterval(函数名,1000); t: Timer = new Timer(1000, 5); t.addEventListener(TimerEvent.TIMER,函数名); t.addEventListener(TimerEvent.TIMER_COMPLETE, 函数名); t.start();