[MySQL] Time type not stored correctly when using ProxySQL

The original issue was open on Hibernate Reactive: https://github.com/hibernate/hibernate-reactive/issues/881

When using the Vert.x MySQL Client driver with ProxySQL, the time type is not stored correctly.

Here’s the descritption of the issue:

we are going to insert time 00:00 to database, but sometimes the data is incorrect after inserted to database.

we have LocalTime in the entity

@Column(name = "time")
private LocalTime time;

the insert statement from hibernate.show_sql log

insert into `TABLE` (`time`) values (?)

the bindings from the hibernate type trace log

[BasicBinder.java] - binding parameter [1] as [TIME] - [00:00]

but when the data inserted to the database, the data changed randomly, for example

id	time
1	-838:59:59
2	00:00:20
3	00:00:00
4	00:02:57

May I know is there anything do after the binding and any ideas about it?

Environment

• Version: 1.0.0.CR6
• Database: ProxySQL 5.5.30 with MySQL 5.7.25-log

A JBang test case is available:

1. Use as jbang template jbang init -t issue881@DavideD/jbang-rep Issue881.java
2. Start docker images with: docker-compose up
3. Run the test with JBang: jbang Issue881.java

[vietj]

it looks like there is a bug in SQL proxy on how it interprets the packets under some conditions.

there is a workaround to fix this, to force the client to always send the type binding when executing a prepared statement but imho it seems it should be reported to SQL proxy.

I’ll open an issue there.

[vietj]

The issue has been reported as a bug in ProxySQL and shall be fixed, I’m closing this issue. NOTE: the same could happen with the JDBC driver.