它返回下面这样的结果集，其中的行数与表中的行数一样多。

It returns the following result set which has as many rows as there are rows in the table.

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步骤3：创建count_rows过程，返回在临时表中找到的行数。

Step3: Create the procedure count_rows which returns the number of rows found in the temporary table.

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也就是说，一个Read函数能够返回一个表对象的指针，而不返回一行数据。

That is, a Read function could return a pointer to a table object instead of returning a row of data.

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