What JPA + Hibernate data type should I use to support the vector extension in a PostgreSQL database?

TL;DR

Use the hypersistence-utils library to map the pgvector column to a List of doubles.

Steps

1. Use the hypersistence-utils library to map the pgvector column to a List of doubles. Add hypersistence-utils-hibernate to your pom, then annotate the entity field with the json type mapping and columnDefinition 'vector': a private List embedding field with @Type(type = 'json') and @Column(columnDefinition = 'vector'). That lets you save and load embeddings through JpaRepository; write custom native queries for nearest-neighbor search.

## When to use

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## When not to use

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## Versions

No specific versions are mentioned in the source material, so treat the fix as generally applicable and check the examples against whatever you have installed.

## Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.

Source: Stack Overflow #76553746 (accepted answer, 8 votes): What JPA + Hibernate data type should I use to support the vector extension in a PostgreSQL database, so that it allows me to create embeddings using a JPA Entity? `` CREATE TABLE items (id bigserial PRIMARY KEY, embedding vector(3)); `` pgvector

Verified resolution: Use the hypersistence-utils library to map the pgvector column to a List of doubles. Add hypersistence-utils-hibernate to your pom, then annotate the entity field with the json type mapping and columnDefinition 'vector': a private List embedding field with @Type(type = 'json') and @Column(columnDefinition = 'vector'). That lets you save and load embeddings through JpaRepository; write custom native queries for nearest-neighbor search.

Source URL: https://stackoverflow.com/questions/76553746/what-jpa-hibernate-data-type-should-i-use-to-support-the-vector-extension-in-a