有没有办法使用 jdbc 在 spring 启动应用程序中开发动态 sql 查询？

Question

I am developing backend for a webapp in Spring Boot using Spring Data JDBC with MYSQL(phpmyadmin) database. The problem is, there is a table ClientInfo with more than 12 columns. Client may query the backend by any number of parameters(columns in database). Should I write controller and sql query for every condition provided by client or is there better way to appraoch to solve this problem.

Edited: Actually I am not using ORM. I am using JDBC and JDBI.

Answer 1

You can use Spring Data JPA Query by Example. Depending on what the client provides, you build an org.springframework.data.domain.Example and then you use it in the query:

ClientInfo c = new ClientInfo();
c.setFirstName("Bill");
Example<ClientInfo> example = Example.of(c);    
List<ClientInfo> results = clientInfoRepository.findAll(example);

In this case the ClientInfoRepository needs to extend JpaRepository:

public interface ClientInfoRepository extends JpaRepository<ClientInfo, Long> {}

Answer 2

For the sql query part: 12 columns are not a lot. You probably can use handy OR-mapping (JPA/hibernate) to retrieve the result into a ClientInfo object at the backend.

For the controller part: from my understanding you're returning selected-fields in resulted data sending back to a web client based on certain request parameters. Suppose you're returning a json result using a spring web controller, you probably can also only create a single controller. And then control what to be included in the replied json. Applying simple technique/logic should be able to achieve this - for example if you use jackson for json handling you may set all the fields you don't want to include as null, and then use @JsonInclude NON_NULL annotations to exclude them.