https://github.com/itzg/try-postgres-arrays
https://github.com/itzg/try-postgres-arrays
Last synced: 3 months ago
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- Host: GitHub
- URL: https://github.com/itzg/try-postgres-arrays
- Owner: itzg
- Created: 2025-05-27T01:48:05.000Z (8 months ago)
- Default Branch: main
- Last Pushed: 2025-05-27T01:51:51.000Z (8 months ago)
- Last Synced: 2025-09-21T18:17:14.824Z (4 months ago)
- Language: Java
- Size: 47.9 KB
- Stars: 2
- Watchers: 0
- Forks: 0
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
Tries out:
- [Postgres array types](https://www.postgresql.org/docs/current/arrays.html)
- [Spring Data JDBC](https://docs.spring.io/spring-data/relational/reference/jdbc.html)
- [Liquibase](https://docs.liquibase.com/start/home.html)
## Info
Entity class is declared with a [list field](https://docs.spring.io/spring-data/relational/reference/jdbc/mapping.html#jdbc.entity-persistence.types), `tags`:
```java
@Table("tasks")
public record Task(
@Id
Long id,
String name,
List tags
) {
}
```
In the Liquibase changeset's [createTable](https://docs.liquibase.com/change-types/create-table.html) [columns](https://docs.liquibase.com/change-types/nested-tags/column.html), the type accepts array syntax:
```yaml
- column:
name: tags
type: text[]
```
A [custom query method in the repository interface](https://docs.spring.io/spring-data/relational/reference/jdbc/query-methods.html#jdbc.query-methods.at-query) can be created to retrieve all the tags:
```java
public interface TaskRepository extends CrudRepository {
@Query("SELECT DISTINCT unnest(tags) AS tag FROM tasks ORDER BY tag")
List findAllTags();
}
```
## Usage
Start the Spring Boot app, which starts Postgres via [Compose support](https://docs.spring.io/spring-boot/reference/features/dev-services.html#features.dev-services.docker-compose).
Create a task with tags
```http request
POST http://localhost:8080/tasks
Content-Type: application/json
{
"name": "test3",
"tags": ["blue", "green"]
}
```
Retrieve tasks
```http request
GET http://localhost:8080/tasks
```
Retrieve all task tags
```http request
GET http://localhost:8080/task-tags
```