JPA findBy(属性) return 空

JPA findBy(Property) return null

我在 Spring 引导中编写了 JPA 代码,我想在其中对实体执行 CRUD 和其他操作,我编写了扩展 JpaRepository

的 RecipeRepository
public interface RecipeRepository extends  JpaRepository<Recipe,Long> {

  public List<Recipe> findByName(String name);

  public Recipe findOneByName(String name);
}

实体class是;

@Entity
@Table(name = "Recipe")
public class Recipe {

@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "sequenceGenerator")
@SequenceGenerator(name = "sequenceGenerator")
private Long id;

@Column(name = "name")
private String name;
..

} 

当我调用 recipeRepository.findByName("test")recipeRepository.findOneByName("test") ,我得到 null。当我调用 findAll() 然后对值进行处理时,我可以找到名称为 test

的 Recipe
String name = "test";

Recipe recipe = recipeRepository.findOneByName(name);

List<Recipe> recipeList = recipeRepository.findByName(name);

Iterable<Recipe> recipies = recipeRepository.findAll();
for(Recipe recipe : recipies){
    System.out.println(recipe.getName());
    // gets value of recipe where name is test
}

在 findByName 或 findOneByName 的日志中,我在日志中得到以下内容:

select recipe0_.id as id1_0_, recipe0_.is_active as is_activ2_0_, recipe0_.is_injected as is_injec3_0_, recipe0_.name as name4_0_, recipe0_.rule as rule5_0_ from recipe recipe0_ where recipe0_.name=?

我将错误的参数值传递给我的控制器。而不是: localhost:8080/recipe/test 我传递的值像 name=test (localhost:8080 /recipe/name=测试).

所以它将名称的值作为“name=test”传递给 recipeRepository.findByName() 方法,而不是 “test”。 =19=]