In the relational version, we must execute one query to get a list of products in each purchase order.
在关系版本中，必须执行一个查询来获取每个采购订单中产品的列表。
The first is to execute the query, retrieve the entire result set from the database, and then simply display the results to the user one page at a time.
第一种是执行查询，从数据库获得完整的结果集，然后每次只向用户显示结果集中的一页。
To execute an SQL query, it must first be compiled into a byte-code program using one of these routines.
要执行SQL查询，必须先使用这些例程之一将它编译成字节码。
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