Introduction

Recently, stumbled ~ above this concern on the Hibernate forum, and since I’ve to be seeing it prior to on StackOverflow and bumped right into it myself while working with JPA and Hibernate, I decided to revolve the answer into an article.

You are watching: No dialect mapping for jdbc type

Therefore, in this article, you space going to uncover out how you can fix the “No dialect mapping for JDBC type” Hibernate issue.

Domain Model

Considering we have a book entity that defines a properties attribute i m sorry is linked with a JSON tower in the database.

The book entity have the right to be mapped as follows:


Entity(name = "Book")
Table(name = "book")
TypeDef( surname = "jsonb-node", typeClass = JsonNodeBinaryType.class)public class publication
Id
GeneratedValue private long id;
NaturalId exclusive String isbn;
Type(type = "jsonb-node")
Column(columnDefinition = "jsonb") exclusive JsonNode properties; //Getters and setters omitted for brevity The JsonNodeBinaryType is detailed by the hibernate-types project, therefore if you desire to persist JSON properties, friend don’t have to write your own Hibernate Types. Just add the hibernate-types exposed to her project and also map the JSON nature accordingly.

Persisting and fetching the book entity

Now, let’s assume us have added the following publication entity in our database:

Book book = new Book();book.setIsbn("978-9730228236");book.setProperties( JacksonUtil.toJsonNode( "" + " "title": "High-Performance Java Persistence"," + " "author": "Vlad Mihalcea"," + " "publisher": "Amazon"," + " "price": 44.99" + "" ));entityManager.persist(book);When persisting the publication entity, Hibernate will problem the suitable SQL INSERT statement:

INSERT INTO book ( isbn, properties, id) worths ( "978-9730228236", "title":"High-Performance Java Persistence", "author": "Vlad Mihalcea", "publisher":"Amazon", "price":44.99 , 1)Now, us fetching the book entity by its natural identifier, we deserve to see the the properties JSON attribute is fetched together a JsonNode:

Book book = entityManager.unwrap(Session.class).bySimpleNaturalId(Book.class).load("978-9730228236");assertEquals( "High-Performance Java Persistence", book.getProperties().get("title").asText());Fetching the JSON attribute making use of JPQLNow, if we desire to having the properties entity attribute making use of JPQL, we deserve to execute the following query:

JsonNode nature = entityManager.createQuery( "select b.properties " + "from book b " + "where b.isbn = :isbn", JsonNode.class).setParameter("isbn", "978-9730228236").getSingleResult();assertEquals( "High-Performance Java Persistence", properties.get("title").asText());And whatever works properly since the JPQL query is parsed and the basic Hibernate kind that handle the nature attribute is going come be known when building the result.

Fetching the JSON attribute using indigenous SQL

However, if we try to execute the same using a indigenous SQL query:

JsonNode properties = (JsonNode) entityManager.createNativeQuery( "SELECT nature " + "FROM publication " + "WHERE isbn = :isbn").setParameter("isbn", "978-9730228236").getSingleResult();assertEquals( "High-Performance Java Persistence", properties.get("title").asText());Hibernate will throw the complying with MappingException:

javax.persistence.PersistenceException: org.hibernate.MappingException: No dialect mapping for JDBC type: 1111The 1111 JDBC form corresponds come Types.OTHER i m sorry is what the PostgreSQL JDBC Driver uses for jsonb column types.

Mapping Types.OTHER to JsonNodeBinaryType

There room several means you can resolve this issue. You have the right to register a Hibernate form to manage the JDBC Types.OTHER either globally or on a per-query basis.

Mapping the JDBC Types.OTHER come JsonNodeBinaryType in ~ the dialect level

You have the right to map a provided JDBC type code to a Hibernate type using the database-specific Dialect.

Therefore, because that PostgreSQL, we might define a PostgreSQL10JsonDialect that looks together follows:

public class PostgreSQL10JsonDialect extend PostgreSQL10Dialect windy PostgreSQL10JsonDialect() super(); this.registerHibernateType( Types.OTHER, JsonNodeBinaryType.class.getName() ); And if we provide the custom PostgreSQL10JsonDialect via the hibernate.dialect construction property:

The aboriginal SQL query will certainly run just fine.

Mapping the JDBC Types.OTHER come JsonNodeBinaryType in ~ the NativeQuery level

Another choice is to carry out Hibernate form associated v the current JDBC ResultSet:

JsonNode nature = (JsonNode) entityManager.createNativeQuery( "SELECT properties " + "FROM publication " + "WHERE isbn = :isbn").setParameter("isbn", "978-9730228236").unwrap(org.hibernate.query.NativeQuery.class).addScalar("properties", JsonNodeBinaryType.INSTANCE).getSingleResult();assertEquals( "High-Performance Java Persistence", properties.get("title").asText());Notice the addScalar an approach call which gives the Hibernate kind to be used when managing the Types.Other JDBC tower type.

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That’s it!

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Conclusion

Handling the No language mapping because that JDBC form issue is not really complicated, and it deserve to be excellent either internationally or top top a per-query basis.