Data source

There are three types of Data source:

• Lucene based search index data sources.
• Stroom’s SQL Statistics data sources.
• Searchable data sources for searching the internals of Stroom.

A data source will have a Doc Ref Doc Ref A Doc Ref (or Document Reference) is an identifier used to identify most documents/entities in Stroom, e.g. an XSLT will have a Doc Ref.Click to see more details... to identify it and will define the set of Fields Field A named data Field within some form of record or entity, and where each Field can have an associated value. In Stroom, Fields can be the Fields in an Index (or other queryable Data Source or the fields of Metadata associated with a Stream, e.g. Stream ID, Feed, creation time, etc.Click to see more details... that it presents. Each Field will have:

• A name
• A set of Conditions Condition A Condition in an query expression term, e.g. =, >, in, etc.Click to see more details... that it supports. E.g. a Feed field would likely support is but not >.
• A flag to indicate if it is queryable or not. I.e. a queryable field could be referenced in the query expression tree and in a Dashboard Dashboard A Dashboard is a configurable entity for querying one or more Data Sources and displaying the results as a table, a visualisation or some other form.Click to see more details... table, but a non-queryable field could only be referenced in the Dashboard table.