How to fix “Error executing DDL ”alter table events drop foreign key FKg0mkvgsqn8584qoql6a2rxheq“ via JDBC Statement”

Question

I\'m trying to start spring boot project with MySQL database, but I have some problem with database. I try to start my application that, and server is running but hibernate don\

Answer 1

Hmm I also encountered this issue but either of those solutions could not solve my issue. I am using MySQL database packaging with XAMPP. What I tried out to solve but failed

• I deleted my Database located in "xampp\mysql\data"
• I renamed my conflicted tables
• Although I kept this "spring.jpa.hibernate.ddl-auto=update" setting in at start.

So what I did to solve this issue. Might be yours

• I completely uninstalled the XAMPP package and Installed it again.
• I created new database name
• RUN the application

Friends it actually my circumstances, might be help your issue like me. If you have any question please post comment. Thanks

Answer 2

Ran into similar issue and found SupaMario's answer here.

In my case I had a table named orders but MySql threw the error as it seems to be a reserve table / keyword.

I changed it to customer_order and it all worked fine.

Answer 3

Change The dialect of hibernate.cfg.xml Dialect :- org.hibernate.dialect.MySQL5InnoDBDialect OR org.hibernate.dialect.MySQL55Dialect OR org.hibernate.dialect.MySQL55InnoDBDialect OR org.hibernate.dialect.MySQL57InnoDBDialect

Answer 4

Ok, had the same issue. Adding prefixes fixed the problem for me:

from:

`
@Entity
@Table(name = "result_man")
@Proxy(lazy = false)
public class ResultManEntity {
@Id
@GeneratedValue
@Column(name = "id", unique = true, length = 128)
private long id;
private String key;
private int score;
private int index;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "result_id")
private ResultEntity result;
}`

to:

`@Entity
@Table(name = "result_man")
@Proxy(lazy = false)
public class ResultManEntity {
@Id
@GeneratedValue
@Column(name = "id", unique = true, length = 128)
private long id;
private String _key;
private int _score;
private int _index;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "result_id")
private ResultEntity result;`

Answer 5

In my case the problem why i got this exception was, that some tables had names which are reserved for postgreSQL. eg. "Like" or "User". Changed name with:

@Table(name="likes") 

and it worked fine. Perhaps someone has the same problem.

Answer 6

Change spring.jpa.hibernate.ddl-auto = create-drop to update. It is dropping the database at start so wont find the required events table to alter anything.