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Hibernate Spatial H2/GeoDB Grails Plugin

  • Authors: Daniel Henrique Alves Lima
0 vote
Dependency: 
compile "org.grails.plugins:hibernate-spatial-hdb:0.0.4"

 Documentation  Source

Summary

Installation

grails install-plugin hibernate-spatial-hdb

Description

Hibernate Spatial Provider for H2/GeoDB.

It's a child plugin of hibernate-spatial.

Usage example

Install the plugin

grails install-plugin hibernate-spatial-hdb

Create a spatially enabled database

// BootStrap.groovy
    def dataSource
    def init = { servletContext ->
        try {
            def sql = new Sql(dataSource)
            sql.executeUpdate('CREATE ALIAS InitGeoDB for "geodb.GeoDB.InitGeoDB"')
            sql.executeUpdate('CALL InitGeoDB()')
        } catch (java.sql.SQLException e) {
            log.debug('', e)
        }
        // (...)
   }

For better instructions on how to create a spatially enabled database: H2/GeoDB Wiki.

Configure the corresponding JDBC Driver dependency in BuildConfig.groovy

dependencies {
        runtime 'com.h2database:h2:1.1.118' 
    }

Change the JDBC URL in DataSource(s).groovy

url = 'jdbc:h2:file:devDB'

In your domain classes, define properties of the type com.vividsolutions.jts.geom.Geometry (or subclasses)

// Place.groovy
package test
import com.vividsolutions.jts.geom.Point
class Place {
    static mapping = {
        location /* H2/GeoDB bug or limitation? */ sqlType: 'blob'
    }
    String description
    Point location
}

Perform some tests using save, dynamic finders, HQL and Criteria

//import com.vividsolutions.jts.geom.GeometryFactory
//import com.vividsolutions.jts.geom.Coordinate
//import org.hibernatespatial.criterion.SpatialRestrictions
//import com.vividsolutions.jts.io.WKTReader
   Place.withNewTransaction {
            Place p = new Place()
            p.description = 'Desc'
            p.location = geometryFactory.createPoint(new Coordinate(5d, 5d))
            p.save(failOnError: true, flush: true)
   }
   Place.withNewTransaction {
             println(Place.createCriteria()
                     .add(SpatialRestrictions.within("location", reader.read('POLYGON ((0 0, 0 10, 10 10, 10 0, 0 0))')))
                     .list())
             def filter = reader.read('POLYGON ((0 0, 0 10, 10 10, 10 0, 0 0))')
             Query q = Place.createQuery("from Place where within(location, ?) = true")
             q.setParameter(0, filter, GeometryUserType.TYPE)
             println (q.list())
   }

DomainClass.withNewTransaction is available through transaction-handling.