【摘要】 研究了在报表设计器和企业数据源之间建立语义层,在语义层中定义数据模型,该模型封装了数据源的技术细节,用户基于语义层设计报表,只需简单地拖拽语义层元素即可,不需要编写复杂表达式和复杂SQ L.语义层的加入不仅给用户的操作带来了极大的方便,而且增强了企业数据的安全性.在模型中字段上建立视图间的关联关系,关系自动作用在报表上,不需要进行视图间连接就可以设计出多源报表,极大地提高了复杂报表的计算效率.更多还原

【Abstract】 This paper mainly researches how to establish semantics layer between report designer and enterprise data source and how to define the data model in semantics layer. This model has sealed the data source technical detail. When users’ design report based on the semantics layer, they only need to drag and drop semantic layer element simply, do not need to compile complex expression or SQL. The using of semantics layer not only brings enormous convenient for users operation, but also strengthens the security of enterprise data. In the model has established the view incidence relation in the field, the relational automatism in the report, does not need to carry on the view to connect may design the multiple source report, which enormous enhancement complex report computational efficiency.更多还原