Query query2 = em.createNativeQuery("update person o set o.personName = ? where o.id = ?") .setParameter(1, "jiang") .setParameter(2, 151); ...
@Entity @Getter @Setter @ToString @Table(name = "order") public class Order { @Id private Long id; @Column(name = "account_id") private Long accountId; @ManyToOne(fetch = FetchType.EAGER) @JoinColumn(name = &q...
has not been solved yet. I found a similar problem on https: stackoverflow.com que... on stackoverflow. I tried it myself and found that it could not filter the subresult set, but only parent. The filtered parent brought out all the sub-objects, . @En...
How do associated annotations such as @ OneToMany, @ OneToOne, @ ManyToMany, etc., specify the fields to be queried? for example, the following code @Entity @Table(name = "db_user") public class User{ @Id @GeneratedValue(strategy = ...
problem description In Hibernate @ OneToOne bidirectional association, how does the main table load lazily? related codes @Entity @Table(name = "db_user") public class User{ @Id @GeneratedValue(strategy = GenerationType.IDENTITY) ...
at present, you want to realize the function of generating sql files from annotated entity. Baidu knows that Hibernate has a SchemaExport that can do it, but it needs Hibernate s xml configuration file by default. I don t know if there is any similar...
my younger brother has been changing the back-end project recently, but I can t solve it with a bug. I think my back-end knowledge is too lacking, so I ve come here to ask for advice. the process is like this: the front end has uploaded information,...
1. When using hibernate s sql query, the result of the database query is 1, and when it is returned to the backend, the result is transformed to 0. 2. The code is as follows: database query code: eclipse: 3.: 4. Tried method: 1 when using a sql...
this is to get List < PortfolioMemberView > at the Dao layer, and I am in the public List<PortfolioMemberView> getPortfolioMemberViewByPid(Integer pid){ portfolioId System.out.print(pid); try { Session sessi...
Environment: Spring3 SpringMvc Hiberate4 SqlServer2005 Oracle11g now it s time to replace the sqlServer database with the oracle database. After changing the database configuration, the project can start normally, but an error will be reported as soo...
Hibernate uses proxy mode when implementing lazy loading, but ManyToOne defaults to Fetch.EAGER mode, so I wonder whether Hibernate will continue to use proxy mode without lazy loading, and why. ...
problem description A SSH project that used to use log4j to manage logs needs to be upgraded to log4j2, but has been unable to output sql statements executed by hibernate to the log file. the environmental background of the problems and what methods...
the configuration file is as follows: spring.datasource.url=jdbc:mysql: localhost:3306 cloudview -sharpcloudmanager spring.datasource.username=root spring.datasource.password=123456 spring.datasource.driver-class-name=com.mysql.jdbc.Driver spring.dat...
try { connection.setAutoCommit(false); bankDao.transferMoney(+2000, 1, connection); 1 2000 if(true){ throw new RuntimeException(); } bankDao.transferMoney(-2000, 2, connection); 2 2000 ...
in the interview the day before yesterday, the interviewer asked me how to do one-to-many mapping in hibernate, so I said how to configure it in the hbm file and add collection classes to entity classes as extended objects. In short, I answered the speci...
I want to invert a value every time I update. Do I have to get this object through java, instead of writing sql ?...
public class ScanRegisterBean implements Serializable{ @Min(value = 1) @Max(value = Long.MAX_VALUE) private long id; @NotBlank(groups = {ScanRegister.class, Register.class}) @Length(min = 2, max = 20,groups = {ScanRegister.class, Re...
I have an entity, for address and an entity, for Person, and he has an attribute address_ids; in it, which is an int [] type, which contains an array of address s id. how to map this address_ids field directly to an object of List < Address >. or i...
the original title was "springdata jpa uses @ ElementCollection to report an error " Table doesn t exists ". Later, I patiently read all the error messages and found that the source of the error was that the sql syntax generated by hibernate was inco...
the data found is a collection of the corresponding types of tables, which can be received. But when traversing, you will run out of ClassCaseException . ...