Apache Solr Reference Guide Covering Apache Solr 6.0

cacheImpl Optional. A class (which must implement DIHCache) to use for caching this entity
when doing lookups from an entity which wraps it. Provided implementation is "Sort
edMapBackedCache".
cacheKey The name of a property of this entity to use as a cache key if cacheImpl is
specified.
cacheLookup
An entity + property name that will be used to lookup cached instances of this entity
if cacheImpl is specified.
where an alternative way to specify cacheKey and cacheLookup concatenated with '='.
eg where="CODE=People.COUNTRY_CODE" is equal to cacheKey="CODE"
cacheLookup="People.COUNTRY_CODE"
child="true" Enables indexing document blocks aka Nested Child Documents for searching with
Block Join Query Parsers . It can be only specified on under another root
entity. It switches from default behavior (merging field values) to nesting documents
as children documents. Note: parent should add a field which is used as
a parent filter in query time.
join="zipper"
Enables merge join aka "zipper" algorithm for joining parent and child entities without
cache. It should be specified at child (nested) . It implies that parent and
child queries return results ordered by keys, otherwise it throws an exception. Keys
should be specified either with where attribute or with cacheKey and cacheLooku
p.
Caching of entities in DIH is provided to avoid repeated lookups for same entities again and again. The default S
ortedMapBackedCache is a HashMap where a key is a field in the row and the value is a bunch of rows for that
same key.
In the example below, each manufacturer entity is cached using the ' id' property as a cache key. Cache
lookups will be performed for each product entity based on the product's " manu" property. When the cache has
no data for a particular key, the query is run and the cache is populated
The SQL Entity Processor
The SqlEntityProcessor is the default processor. The associated data source should be a JDBC URL.
The entity attributes specific to this processor are shown in the table below.
Attribute
query
deltaQuery
parentDeltaQuery
Use
Required. The SQL query used to select rows.
SQL query used if the operation is delta-import. This query selects the primary keys of the
rows which will be parts of the delta-update. The pks will be available to the
deltaImportQuery through the variable ${dataimporter.delta. }.
SQL query used if the operation is delta-import.
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