anyone who has used oracle knows that the self-increasing id, of oracle is usually implemented by sequence. I only marked @ Id, on the entity and did not mark it to other additional comments. I thought there would be an error in save, but it actually ...
this is a question post with nothing to do, the problem encountered by the beginner of programming, there is no solution, I do not know which seniors have ideas, but also hope to give me some advice. is like this The project uses spring-data-jpa as ...
one class @Entity public class Shuo{ @Id @GeneratedValue private int id; private String title; private Date date; String content; @ManyToOne(cascade = CascadeType.REFRESH) @JoinColumn(name = "user_id") private User user; : @OneT...
https: github.com thymeleaf . I use jpa, to cascade the two classes through annotations. in the html page, when you get the object of any class through the thymeleaf tag, it will appear . java.lang.StackOverflowError: null at sun.reflect.misc.Refl...
there is a set collection of tag classes in the user class; maintain relationships only from the user class, one-to-many @ OneToMany @JoinTable(name="shuo_tag", inverseJoinColumns=@JoinColumn(name="tag_id"), jo...
sources of topics and their own ideas for example: 8000000000000000000000000000000001000 1000 & | ^ -sharp-sharp-sharp related codes -sharpinclude <iostream> using namespace std; { int y; cin >> y; fo...
problem description the front end requests the picture in the node.js server. After getting the src path, the img image cannot be displayed properly, and the network cannot display normally. the environmental background of the problems and what m...
canvas draws multiple ball collisions on the canvas. How can I add a click event to the ball? as far as I know, adding an event to the canvas actually gets an area on the canvas to fix an event? Is it true that the ball can not be added if it keeps ch...
var a=[ [ 1 2 3 ], [ 4 5 6 ] ]; var b= [ [78910], [11121314], [15161718], [19202122] ]; concatenate each element in array a (1p2p3, etc.) with ...
errors are as follows: root@iZm5e33: srv down PDO_MYSQL-1.0.2-sharp. configure-- with-php-config= usr bin php-config-- with-pdo-mysql= usr bin mysql checking for grep that handles long lines and-e. bin grep checking for egrep. bin grep-E chec...