spring Data JPA 集成solr7（三）

3. Document Mapping

Though there is already support for Entity Mapping within SolrJ, Spring Data Solr ships with its own mapping mechanism shown in the following section. NOTE: DocumentObjectBinder has superior performance. Therefore usage is recommended if there is not need for custom type mapping. You can switch to DocumentObjectBinder by registering SolrJConverter within SolrTemplate.

3.1. Mapping Solr Converter

MappingSolrConverter allows you to register custom converters for your SolrDocument and SolrInputDocument as well as for other types nested within your beans. The Converter is not 100% compartible with DocumentObjectBinder and @Indexedhas to be added with readonly=true to ignore fields from beeing written to solr.

Example 57. Sample Document Mapping

public class Product {
  @Field
  private String simpleProperty;

  @Field("somePropertyName")
  private String namedPropery;

  @Field
  private List<String> listOfValues;

  @Indexed(readonly = true)
  @Field("property_*")
  private List<String> ignoredFromWriting;

  @Field("mappedField_*")
  private Map<String, List<String>> mappedFieldValues;

  @Dynamic
  @Field("dynamicMappedField_*")
  private Map<String, String> dynamicMappedFieldValues;

  @Field
  private GeoLocation location;

}

Taking a look as the above MappingSolrConverter will do as follows:

Property	Write Mapping
simpleProperty	<field name="simpleProperty">value</field>
namedPropery	<field name="somePropertyName">value</field>
listOfValues	<field name="listOfValues">value 1</field> <field name="listOfValues">value 2</field> <field name="listOfValues">value 3</field>
ignoredFromWriting	//not written to document
mappedFieldValues	<field name="mapentry[0].key">mapentry[0].value[0]</field> <field name="mapentry[0].key">mapentry[0].value[1]</field> <field name="mapentry[1].key">mapentry[1].value[0]</field>
dynamicMappedFieldValues	<field name="'dynamicMappedField_' + mapentry[0].key">mapentry[0].value[0]</field> <field name="'dynamicMappedField_' + mapentry[0].key">mapentry[0].value[1]</field> <field name="'dynamicMappedField_' + mapentry[1].key">mapentry[1].value[0]</field>
location	<field name="location">48.362893,14.534437</field>

To register a custom converter one must add CustomConversions to SolrTemplate initializing it with own Converterimplementation.

<bean id="solrConverter" class="org.springframework.data.solr.core.convert.MappingSolrConverter">
	<constructor-arg>
		<bean class="org.springframework.data.solr.core.mapping.SimpleSolrMappingContext" />
	</constructor-arg>
	<property name="customConversions" ref="customConversions" />
</bean>

<bean id="customConversions" class="org.springframework.data.solr.core.convert.SolrCustomConversions">
	<constructor-arg>
		<list>
			<bean class="com.acme.MyBeanToSolrInputDocumentConverter" />
		</list>
	</constructor-arg>
</bean>

<bean id="solrTemplate" class="org.springframework.data.solr.core.SolrTemplate">
	<constructor-arg ref="solrClient" />
	<property name="solrConverter" ref="solrConverter" />
</bean>