The first JSP, Welcome.jsp, occupies both the presentation layer and the data layer by using the JSTL SQL library to issue an SQL query from the page.

第一个 JSP，即 Welcome.jsp， 使用 JSTL SQL 库从该页面发出一个 SQL 查询，因而同时占据了表示层和数据层。

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You can test and refine your SQL statement right from the Eclipse workbench until it satisfies your needs and then cut-and-paste the SQL statement text into your reporting JSP file.

可以从eclipse工作台中测试和精炼sql语句，直到满足需要，然后将sql语句文本剪切并粘贴到报表JSP文件中。

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The first two lines include the taglib directives available to the JSP page, so that you can use the core and SQL JSTL tag libraries.

前两行包括可用于jsp页面的taglib指令，这样便可以使用core和SQL JSTL标记库。

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