Report Engine-research on the implementation of rundry reports

I have used many companies' report trial versions. I personally think it is a very flexible product to run dry reports. Although the current designer can only be used by developers :)

In the course of trying to accumulate reports, I tried her core concepts carefully and found that I could implement a similar report engine, therefore, I also used Delphi to implement a report engine that displays the core part of a report (the report function has not been added). You can refer to 《Cross-tabulation report Design"Example

The following two core technologies and concepts are used to implement the report engine:

• Mathematical Expression Engine
• Report Extension Model

Prepare to re-implement a report engine under. Net Based on which form design, query forms, reports, and process data analysis can be performed.

As mentioned above, we need to implement an Expression Engine Based on two core technologies. My previousArticleSyntax file for implementing Expression Engine by anlrThe main syntax file of an example implemented using anlr is written in. Later, I will use anlr to compile a mathematical expression computing engine, which will be shared with you.

There are other articles and materials you can refer to on the Internet. For example:

• State of the art expression evaluation
• An extensible math expression parser with plug-ins
• Implementing an Excel-like Formula Engine
• Flee-fast lightweight Expression Evaluator

 

Report Engine Design Workshop