使用Spring数据JPA，如何为过滤器表单创建动态查询

Question

I want to create a form that will generate the sql query for me based on the form input.

For example, I have a table People[id, name, age], and a form with two fields: Name and age.

If all the two fields are completed on the form, the query was going to be like this:

 List<People> findByNamendAge(String name, Int age);

But if only the name is filled, I want to show all the people that correspond to just the name, even though the age is left blank.

(of course, in this example I could create a findByName(String name) and a finByAge(Int age) , and a simple if/else would do, but my real problem envolves a filter that contains a large amount of inputs)

Answer 1

You should use JPA CriteriaAPI for that. You can find an example here:

Conditional where clause in JPA criteria query