The first is the main interface of the book management system, which combines the search and query results into one page, and submits it to the BookServlet class through the form.
Call the query method, put the query results in the collection and transfer them to the front-end interface, and the front-end interface is accepted and displayed through EL and JSTL .
Specifically look up the book category and book category, pass the bookname and typeId to the BookServlet , and the Servlet class receives and processes it.
Book details, confirm the book by bookId
In the case of bookId , call the ID query method to confirm the unique book, forward the result to the details page, and the details page will accept and output.
Java is a language, similar to mathematics, they all share common features. Different people have different solutions to the same problem. Questions cannot be completed, and projects cannot be completed. How to solve problems efficiently and quickly? In addition to practice makes perfect and more practice, you should also have the ability to summarize the solutions to certain types of problems, and summarize the general purpose of such problems. way of doing questions.
The library management system, the student management system, and the film management system are, in the final analysis, the four pillars of additions, deletions, revisions, and investigations.
Today the library management system only involves inquiries.
First, traverse and output all the information, first write the underlying code, the general method of query, and then pass the query result to the front desk by instantiating methods and classes in the background, and the front desk is responsible for accepting it.
The specific query is to find out their "primary key", pass this unique value to the background, and the background obtains this information from the database through this unique value, and then transmits it to the front-end interface.
You can also simply compare Java to cooking, and coding is like cooking . , With a recipe in mind, cooking will not be in a hurry, and if you have an idea, you will not be at a loss for projects.