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The functionality of the is exposed through a Java API and a REST API. This section describes these APIs. The server-side query builder ( ) will accept a query description, create and run an XPath query, optionally filter the result set, and also extract facets, if desired. The query description is simply a set of predicates ( ). Examples include a full-text predicate, which corresponds to the jcr:contains function in XPath, and an image size predicate that looks for width and height properties in the DAM asset subtree.
For each predicate type, there is an evaluator component ( ) that knows how to handle that specific predicate for XPath, filtering, and facet extraction. It is very easy to create custom evaluators, which are plugged-in through the OSGi component runtime. The REST API provides access to exactly the same features through HTTP with responses being sent in JSON.
The purpose of the p.guessTotal parameter is to return the appropiate number of results that can be shown by combining the minimum viable p.offset and p.limit values. The advantage of using this parameter is improved performance with large result sets.
This avoids calculating the full total (e.g calling result.getSize) and reading the entire result set, optimized all the way down to the OAK engine & index. This can be a significant difference when there are 100 thousands of results, both in execution time and memory usage.
The disadvantage to the parameter is users do not see the exact total. But you can set a minimum number like p.guessTotal=1000 so it will always read up to 1000, so you get exact totals for smaller result sets, but if it's more than that, you can only show 'and more'. Add p.guessTotal=true to the query below to see how it works. By default the Query Builder would also provide the number of hits. Depending on the result size this might take long time as determining the accurate count involves checking every result for access control.
Mostly the total is used to implement pagination for the end user UI. As determining the exact count can be slow it is recommended to make use of the guessTotal feature to implement the pagination. For example, the UI can adapt following approach:. Get and display the accurate count of the number of total hits ( or total in the querybuilder.json response) are less than or equal to 100;.
Set guessTotal to 100 while making the call to the Query Builder. The response can have the following outcome:. total=43, more=false - Indicates that total number of hits is 43. The UI can show up to ten results as part of the first page and provide pagination for the next three pages. You can also use this implementation to display a descriptive text like '43 results found'. total=100, more=true - Indicates that the total number of hits is greater than 100 and the exact count is not known. The UI can show up to ten as part of the first page and provide pagination for the next ten pages.
You can also use this to display a text like 'more than 100 results found'. As the user goes to the next pages calls made to the Query Builder would increase the limit of guessTotal and also of the offset and limit parameters. GuessTotal should also be used in cases where the UI needs to make use of infinite scrolling, in order to avoid the Query Builder from determining the exact hit count. This query uses a group (named ' group'), which acts to delimit subexpressions within a query, much as parentheses do in more standard notations. For example, the previous query might be expressed in a more familiar style as: 'Management' and ('/content/geometrixx/en/company/management' or '/content/geometrixx/en/company/bod') Inside the group in the example, the path predicate is used multiple times. To differentiate and order the two instances of the predicate (ordering is required for some predicates), you must prefix the predicates with N where N is the ordering index. In the previous example, the resulting predicates are 1path and 2path.
The p in p.or is a special delimiter indicating that what follows (in this case an or) is a parameter of the group, as opposed to a subpredicate of the group, such as 1path. If no p.or is given then all predicates are ANDed together, that is, each result must satisfy all predicates.
For more predicates, see the. You can also check the. The Javadoc for these classes contains the list of properties that you can use.
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The prefix of the class name (for example, ' similar' in ) is the principal property of the class. This property is also the name of the predicate to use in the query (in lower case). For such principal properties, you can shorten the query and use ' similar=/content/en' instead of the fully qualified variant ' similar.similar=/content/en'. The fully qualified form must be used for all non-principal properties of a class. Enable DEBUG logs for QueryBuilder to obtain underlying, explainable XPath query. Navigate to Create a new logger for com.day.cq.search.impl.builder.QueryImpl at DEBUG.
Once DEBUG has been enabled for the above class, the logs will display the XPath generated by Query Builder. Copy the XPath query from the log entry for the associated QueryBuilder query, For example:. com.day.cq.search.impl.builder.QueryImpl XPath query: /jcr:root/content//element(., cq:Page)(jcr:contains(jcr:content, 'Geometrixx') or jcr:contains(jcr:content/@cq:tags, 'Geometrixx')). Paste the XPath query into as XPath to obtrain the query plan. Explain all queries during the development cycle against the target index set.
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Obtain explain-able XPath via logging. Enable DEBUG logs for QueryBuilder to obtain underlying, explainable XPath query. Navigate to Create a new logger for com.day.cq.search.impl.builder.QueryImpl at DEBUG. Once DEBUG has been enabled for the above class, the logs will display the XPath generated by Query Builder.
Copy the XPath query from the log entry for the associated QueryBuilder query, For example:. com.day.cq.search.impl.builder.QueryImpl XPath query: /jcr:root/content//element(., cq:Page)(jcr:contains(jcr:content, 'Geometrixx') or jcr:contains(jcr:content/@cq:tags, 'Geometrixx')). Redgate sql tool belt keygen idm. Paste the XPath query into as XPath to obtrain the query plan.