第1个是普通搜索，当关键字文本框没有输入任何数据时，单击“搜索”按钮后，可以对数据表中的所有内容进行查询；当在新闻类别选择对话框中选择查询的条件，单击“搜索”按钮后，可以按照新闻类别查询数据表中所有内容；当在关键字文本框中，单击“搜索”按钮后，可以按关键字内容查询数据表中的内容；当在新闻类别选择对话框中，选择新闻的类别，同时在关键字文本框中输入要搜索内容，单击“搜索”按钮后，可以根据这两个条件对数据表内容进行查询操作。第2个是高级搜索。本实例的高级图书查询功能不但可以查询图书的基本信息，还可以指定图书出版时间的范围、定价范围和页数范围来查询图书信息，另外还有更加详细的图书简介查询，它可以查询多个关键字词、完整字句、模糊字词和不包含的字词等。高级图书查询运行效果如图1.2所示。-The first is a general search, when the keyword text box does not enter any data, click the "Search" button, the data table can all content inquiries　When news categories to choose dialog box, select the query conditions, Click "Search" button, you can query data in accordance with the type of news all the contents of the table　when the text in the keyword box, click the "Search" button, you can query data by keyword content table of contents　when at a press Select type of dialog box, select the type of news at the same time in the keyword text box to search the contents, click the "Search" button, based on these two conditions on the contents of data table query operation. No. 2 is the Advanced Search. Examples of high-level book of this inquiry can search for books not only basic information, can also specify the scope of book publishing time, the scope of the pricing range and number of pages of information to look up books, as well as more detailed briefing book inquiries, it ca