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班entity位于下方，
User提供了@Entity
public class User {
// form:hidden - hidden value
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
Integer id;
// form:input - textbox
@Column(name = "name", columnDefinition = "VARCHAR(30)", nullable = false)
String name;
// form:input - textbox
@Column(name = "email", columnDefinition = "VARCHAR(50)", nullable = false)
String email;
// form:textarea - textarea
@Column(name = "address", columnDefinition = "VARCHAR(255)", nullable = true)
String address;
// form:input - password
@Column(name = "password", columnDefinition = "VARCHAR(20)", nullable = false)
String password;
// form:input - password
String confirmPassword;
// form:checkbox - single checkbox
@Column(name = "newsletter", nullable = true)
boolean newsletter;
// form:checkboxes - multiple checkboxes
// @Column(columnDefinition = "VARCHAR(500)", nullable = false)
@ElementCollection
List<String> framework;
// form:radiobutton - radio button
@Column(name = "sex", columnDefinition = "VARCHAR(1)", nullable = true)
String sex;
// form:radiobuttons - radio button
@Column(name = "number", nullable = true)
Integer number;
// form:select - form:option - dropdown - single select
@Column(name = "", columnDefinition = "VARCHAR(10)", nullable = true)
String country;
// form:select - multiple=true - dropdown - multiple select
// @Column(columnDefinition = "VARCHAR(500)", nullable = true)
@ElementCollection
List<String> skill;
//Check if this is for New of Update
public boolean isNew() {
return (this.id == null);
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getConfirmPassword() {
return confirmPassword;
}
public void setConfirmPassword(String confirmPassword) {
this.confirmPassword = confirmPassword;
}
public boolean isNewsletter() {
return newsletter;
}
public void setNewsletter(boolean newsletter) {
this.newsletter = newsletter;
}
public List<String> getFramework() {
return framework;
}
public void setFramework(List<String> framework) {
this.framework = framework;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public Integer getNumber() {
return number;
}
public void setNumber(Integer number) {
this.number = number;
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
public List<String> getSkill() {
return skill;
}
public void setSkill(List<String> skill) {
this.skill = skill;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof User)) return false;
User user = (User) o;
if (isNewsletter() != user.isNewsletter()) return false;
if (!getId().equals(user.getId())) return false;
if (!getName().equals(user.getName())) return false;
if (!getEmail().equals(user.getEmail())) return false;
if (getAddress() != null ? !getAddress().equals(user.getAddress()) : user.getAddress() != null) return false;
if (!getPassword().equals(user.getPassword())) return false;
if (getConfirmPassword() != null ? !getConfirmPassword().equals(user.getConfirmPassword()) : user.getConfirmPassword() != null)
return false;
if (!getFramework().equals(user.getFramework())) return false;
if (getSex() != null ? !getSex().equals(user.getSex()) : user.getSex() != null) return false;
if (getNumber() != null ? !getNumber().equals(user.getNumber()) : user.getNumber() != null) return false;
if (getCountry() != null ? !getCountry().equals(user.getCountry()) : user.getCountry() != null) return false;
return getSkill() != null ? getSkill().equals(user.getSkill()) : user.getSkill() == null;
}
@Override
public int hashCode() {
int result = getId().hashCode();
result = 31 * result + getName().hashCode();
result = 31 * result + getEmail().hashCode();
result = 31 * result + (getAddress() != null ? getAddress().hashCode() : 0);
result = 31 * result + getPassword().hashCode();
result = 31 * result + (getConfirmPassword() != null ? getConfirmPassword().hashCode() : 0);
result = 31 * result + (isNewsletter() ? 1 : 0);
result = 31 * result + getFramework().hashCode();
result = 31 * result + (getSex() != null ? getSex().hashCode() : 0);
result = 31 * result + (getNumber() != null ? getNumber().hashCode() : 0);
result = 31 * result + (getCountry() != null ? getCountry().hashCode() : 0);
result = 31 * result + (getSkill() != null ? getSkill().hashCode() : 0);
return result;
}
}
课程，
UserRepository在public interface UserRepository extends CrudRepository<User, Long> {
User findById(Integer id);
List<User> findAll();
void update(User user);
// void delete(Integer id);
}
目录中，还提供了界面和实现，
service下面提供了该课程的实施，
public interface UserService {
User findById(Integer id);
List<User> findAll();
void save(User user);
void update(User user);
// void delete(int id);
}
当我运行程序时，我收到错误
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserRepository userRepository;
public User findById(Integer id) {
return userRepository.findById(id);
}
public List<User> findAll() {
return userRepository.findAll();
}
public void save(User user) {
userRepository.save(user);
}
public void update(User user) {
userRepository.update(user);
}
// public void delete(int id) {
// userRepository.delete(id);
// }
}
显然，这来自Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userController': Unsatisfied dependency expressed through field 'userService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userServiceImpl': Unsatisfied dependency expressed through field 'userRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': Invocation of init method failed; nested exception is org.springframework.data.mapping.PropertyReferenceException: No property update found for type User!
方法。我使用update数据库。如何解决这个问题？
答案 0 :(得分：1)
在Spring数据CRUD存储库中没有名为update的方法，它相当于保存。
save方法负责持久保存新实体。
查看SimpleJpaRepository课程。这是片段：
@Transactional
public <S extends T> S save(S entity) {
if (entityInformation.isNew(entity)) {
em.persist(entity);
return entity;
} else {
return em.merge(entity);
}
}
如果您想在方法之上编写本机查询，请使用@Query：
@Query('<<UPDATE QUERY>>')
update(..)
对代码共享的建议很少：
public interface UserRepository extends CrudRepository<User, Long> {
}
删除所有方法，因为已定义的方法已通过CrudRepository：
public interface CrudRepository<T, ID extends Serializable>
extends Repository<T, ID> {
<S extends T> S save(S entity);
T findOne(ID primaryKey);
Iterable<T> findAll();
Long count();
void delete(T entity);
boolean exists(ID primaryKey);
// … more functionality omitted.
}