表中的页数和非空的页数。
The number of pages in a table and the number of pages that are not empty.
在这个例程中，首先检查是否有非空的上下文句柄。
Within this routine, first a check for non-null context handle is made.
确认产品目录中的字段(正数价格，非空的标题和描述)。
Validation of the fields in the product catalog (positive price, non-blank title and description).
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