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ez.no / documentation / ez publish / technical manual / 4.6 / features / search engine


Caution: This documentation is for eZ Publish legacy, from version 3.x to 5.x.
For 5.x documentation covering Platform see eZ Documentation Center, for difference between legacy and Platform see 5.x Architecture overview.

Search engine

The system comes with a built-in search engine which integrates tightly with the content structure. It is capable of indexing everything that is inputted through the native content model.

Note: Before you read on, please be aware that eZ Systems has developed a new powerful, enterprise search extension. eZ Find is a search extension for eZ Publish, providing more functionality and better results than the default search in eZ Publish. The main advantages of eZ Find over the default eZ Publish search mechanism are:

  • relevancy ranking and keyword highlighting in the search results.
  • search results are served from a copy of the search index.
  • In addition, the eZ Find search engine remembers all caching structures from previous searches and, during indexing, updates these as well. Therefore, the more the search engine is used, the faster it becomes.

Find more information on eZ Find here.

In eZ Publish, a content class describes the actual data structures (for example news articles, products, etc.). The classes are built up of attributes which are represented by datatypes. An attribute can be the title of an article, the price of a product and so on. It is possible to control which attributes that should be indexed by the search engine. This can be done by making use of the "Searchable" check-boxes while editing a class. Some datatypes (for example float, price, etc.) do not support indexing. Please refer to the datatype overview page to see which datatypes that can be indexed.

When an object is published, the attributes that are marked searchable will be indexed by the search engine. It will then be possible to use the search interface to find words or phrases that are a part of the published content. For example, if the user searches for "backpack", the system will return a list of all kinds of objects where the word "backpack" occurs. This is the default behavior. The following screenshot shows the standard search interface.

Advanced search

The advanced search interface makes it possible tweak and narrow the search. The following features are supported:

  •  Search for several words at the same time (for example "car bike train").
  •  Search for an exact phrase (for example "cheap cars in Scandinavia").
  •  Class level filtering (limit the search to a specific class).
  •  Attribute level filtering (search only a specific attribute).
  •  Tree level filtering (limit the search to a part of the node tree).
  •  Section filtering (limit the search to objects that belong to a certain section).
  •  Time filtering (yesterday, last week/month/3-months/year).

The following screenshot shows the advanced search interface.

Wildcard searching

The default behavior of the search engine is that it only searches for complete words or phrases. If the user searches for "demo", the system will not return objects that contain words like "demolition", "demonstration" and so on. However, eZ Publish does in fact support wildcard searching, but it must be turned on by adding the following lines to a configuration override for "site.ini":

[SearchSettings]
EnableWildcard=true

When the wildcard search feature is turned on, it is possible to use the asterisk character as a wildcard, for example like this: "demo*". In this case, eZ Publish will return a list of objects that contain words starting with "demo". For example, it would return objects containing words like "demonstration", "demolition", etc. When this notation is used, the result will also return objects that contain the word which was specified before the asterisk. In other words, objects containing only the word "demo" will also be returned.

Please note that the asterisk can only be used after a word. This means that the following search queries are invalid: "*demo" and "some*thing".

Warning! There is a good reason for the wildcard search being turned off by default. It requires a lot more processing time than the standard search. This means that the server might have to be upgraded in order to produce faster results and to achieve less overall system load.

Logical operators

Inline logical operators like "AND" and "OR" are not supported. This means that it is not possible to specify search queries like "cars AND minivans" or "trucks OR vans". However, it is in fact possible to do an AND search. This can be done by making use of the "Search for all of the following words" input field in the advanced search interface. For example, if the user inputs "cars bikes" then the system will return a list of objects that contain both of these words. The order of the words is insignificant.

Search statistics

The setup part of the administration interface provides access to a page that reveals information about words/phrases that have been searched along with the average results that have been returned. The following screenshot shows the search statistics interface.

The "Reset statistics" button will simply clear the search log.

Balazs Halasy (14/09/2010 11:44 am)

Geir Arne Waaler (27/05/2011 1:48 pm)


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