JPA完全动态和多级标准api

我试图看看如何创建一个JPA Critera查询，它允许多级别的完全动态过滤。

例如

select * from table where ( (column1 = 'A' and (column2 = 'B' or column3 = 'C') ) or column3 = 'D' 

Answer 1

您需要在下面的测试中创建规范。 这可以是动态的。

 @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(classes=HelloWorldConfig.class) public class SpecificationTest { @Autowired private AccountRepository repository; @Test public void test1() { final List names = Arrays.asList(new String[]{"George","Max"}); Specification specification = new Specification() { public Predicate toPredicate(Root root, CriteriaQuery query, CriteriaBuilder builder) { List predicates = new ArrayList(); predicates.add(root.get("name").in(names).not()); return builder.and(predicates.toArray(new Predicate[predicates.size()])); } }; assertNotNull(repository); repository.save(makeAccount("Greg", "123456787", "01-02-01")); repository.save(makeAccount("George", "123456788", "01-02-02")); repository.save(makeAccount("Max", "123456789", "01-02-03")); List accounts = repository.findAll(specification); assertEquals(1,accounts.size()); assertEquals("123456787",accounts.get(0).getAccountNumber()); } private Account makeAccount(String name, String accountNumber, String sortCode) { Account account = new Account(); account.setName(name); account.setAccountNumber(accountNumber); account.setSort(sortCode); return account; } } 

存储库的位置如下：

 @Repository public interface AccountRepository extends JpaRepository, JpaSpecificationExecutor { }