QString字符串拼接【转载】

原文网址：http://www.cnblogs.com/ftrako/p/3481571.html

for(intloop=1;loop<2;loop++)

{

QStringtest1=QString("insertinto%1values(%2,1,name%3,1);").arg(CSM_SQL_TABLE_STUDENT).arg(loop).arg(loop);

QStringtest2=QString("insertinto%1values(%2,1,name%2,1);").arg(CSM_SQL_TABLE_STUDENT).arg(loop);

// 以上两种方式均打印出：

test1 = "insert into student values(0, 1, name0, 1);"

test2 = "insert into student values(0, 1, name0, 1);"

QDateTime currentDateTime = QDateTime::currentDateTime();

    QDate date = currentDateTime.date();

    QTime time = currentDateTime.time();

    QString dateTime = QString("%1-%2-%3 %4:%5:%6")

                        .arg(date.year())

                        .arg(date.month(), 2, 10, QChar('0'))  // 表示2个字宽，10进制，未满字宽用'0'填补

                        .arg(date.day(), 2, 10, QChar('0'))

                        .arg(time.hour(), 2, 10, QChar('0'))

                        .arg(time.minute(), 2, 10, QChar('0'))

                        .arg(time.second(), 2, 10, QChar('0'));

dateTime的值为: 2014-06-23 17:27:0