Spring Data JPA：查询优化

Question

While working on a demo project I stuck at Spring Data JPA method based query. I want to search top 5 results which contain my search team in name or address field.

For that my repository method is:

findTop5ByNameContainingIgnoreCaseOrAddressContainingIgnoreCase(String name,
      String address);

I am just wondering is it most optimized way to achieve results or it can further optimize to improve performance?

Answer 1

The method:

findTop5ByNameContainingIgnoreCaseOrAddressContainingIgnoreCase(String name, String address);

Generates a SQL like (Sql Server example):

select top 5 e.* from Entity e 
WHERE UPPER(e.name) LIKE UPPER('%SomeName%') OR UPPER(e.address) LIKE UPPER('%SomeAddress%')

In terms of SQL, this query is already really straightforward.

To improve the performance, you could create a index for this two fields or create two indexed new columns for address and name , both already saved with upper case. So you will not have to convert each information of address and name to upper case and compare.

Like:

id | name | name_search | address    | address_search
1  | John | JOHN        | Street Abc | STREET ABC

And the query:

findTop5ByNameSearchContainingOrAddressSearchContaining(
    String nameUpperCase, String addressUpperCase);