Hibernate a strange phenomenon (repeating a record) when you get a table full record _it technology

At the company project today,

I connect Oracle with hibernate.

When you list all the records for a table, you find a record that repeats. and directly with the JDBC connection, you can correctly listed.

I thought JDBC was unstable, and I was startled. After all, intend to use it as a long-term database AH ~ ~

The primary key ID for the exact duplicate data was repeated (or, when the JDBC set up the table, there was no primary key, because it was randomly tested).

I see:

It seems that hibernate first get all the IDs list and then GetItemByID.