Скачать или смотреть How to Insert a Point / MultiPolygon in Postgres with Spring Data JPA using PostGIS

Learn how to effectively insert `Point` and `MultiPolygon` geometries into your Postgres database with Spring Data JPA and PostGIS. This guide provides a detailed breakdown of the solution to ensure seamless integration.
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Inserting a Point / MultiPolygon in Postgres with Spring Data JPA

When working with geographic data in a Postgres database, especially in conjunction with Spring Data JPA and PostGIS, developers often face challenges while attempting to insert geometries like Point and MultiPolygon. This post addresses these challenges and offers a practical solution for properly saving Point and MultiPolygon geometries in a Postgres database.

The Problem

You are developing a web application using Spring Data JPA, seeking to store geographic information received from the frontend as GeoJSON. However, when attempting to save a Partner entity that contains these geometric types, you encounter an error:

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This error typically occurs during the serialization or deserialization process while handling geometric objects.

The Solution

To resolve this issue, we need to ensure that we're correctly handling the geometric types in the context of Spring Data JPA. The solution involves creating custom deserializers and a user-defined type for handling geometry objects. Follow along with these steps:

Step 1: Create Custom Deserializers

As you've likely done, use Jackson to create custom deserializers for Point and MultiPolygon. These deserializers will convert the incoming GeoJSON strings into the appropriate JTS geometry types.

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Step 2: Define Your Entity with Geometry Fields

Ensure that your entity is correctly configured to use these deserializers. Here’s how you might define your Partner entity:

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Step 3: Implement a Custom UserType for Geometry

To handle the storage of geometry types correctly, implement a custom UserType. This custom type will serialize and deserialize the geometric data as bytes, suitable for binary storage in PostgreSQL.

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Step 4: Annotate the Geometry Fields in the Entity

Finally, annotate the address and coverageArea fields in your Partner entity using the custom @ Type annotation.

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Conclusion

By following these steps, you should be able to effectively insert Point and MultiPolygon geometries into your Postgres database using Spring Data JPA. This method involves proper serialization and deserialization of your GeoJSON inputs, handling data types correctly, and ensuring your Java objects conform to the needs of your PostgreSQL setup.

If you encounter further issues, consider checking your GeoJSON format and database schema definitions to ensure they align correctly with the requirements of PostGIS.

With this guide, you can smoothly implement geographic features in your application, enhancing its capabilities with spatial data handling.