QSqlQuery query & void QSqlQuery::clear ()

在Qt中使用sqlite数据库。

使用QSqlQuery query执行sql语句。

sql语句正常，但query.exec() 返回false，无法更新数据库。

解决方法：

使用 void QSqlQuery::clear ()

使用query之后要query.clear()。

query.prepare("update clock set "
                  " title = ?,"
                  " remark = ?,"
                  " templatetype = ?,"
                  " looptype = ?,"
                  " alarmtime = ?,"
                  " nextalarmtime = ?,"
                  " onalarmtime = ?,"
                  " prealarmtime = ?,"
                  " isenable = ?"
                  " where id = ?");

    query.addBindValue(title);
    query.addBindValue(remark);
    query.addBindValue(templatetype);
    query.addBindValue(looptype);
    query.addBindValue(alarmTime);
    query.addBindValue(nextAlarmTime);
    query.addBindValue(onAlarmTime);
    query.addBindValue(preAlarmTime);
    query.addBindValue(isEnable);
    query.addBindValue(id);
    bool isSucceed = query.exec();
    ...
   query.clear();