以下情况如何创建数据库表？

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我的表名开始没有确定，而是通过一个字符串确定，如下：    QString tab="mytab";    QSqlQuery query;    query.exec("CREATE TABLE  表名 (id INTEGER PRIMARY KEY AUTOINCREMENT,"//这里要求表名=tab字符串                                                   "datetime  VARCHAR(30) ,"                                                   "name VARCHAR(30) ,"                                                   "addr VARCHAR(16),"                                                   "type VARCHAR(20) ,"                                                   "explain VARCHAR(10) )");