Qt database operation error not positioned on a valid record

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Today's article on the word:

not positioned on a valid record

This translation is very simple, it is not positioned on a valid data record.

The reason is simple, because the operation when performing sql, data pointer is to stay ahead of the data, therefore, we need to move the pointer to:

QSqlQuery sql;

    sql.exec("select name,password from adminuser");

    sql.next();

The following is next () function.