Server-side JavaScript

Search

MarkLogic provides a powerful search capability, allowing queries on scalar values, text, elements or JSON properties, geospatial constraints, collections, and directories. Range indexes allow for inequality queries. Furthermore, all query types are fully compossible.

The code below builds a query, runs a search, and iterates through the results.

/*
 * Find the active users who mention "sell out" in their profile. Of the three 
 * most recent registrants, order by most number of tags.
 */

var query = cts.andQuery([
  cts.orQuery([
    cts.jsonPropertyValueQuery("isActive", true),
    cts.jsonPropertyWordQuery("about", "sell out") // The text "sell out" or its stems
  ]),
  cts.collectionQuery("fake data")
]);

// Order by registration date, newest to oldest. Note that the 
// jsonPropertyReference requires a range index on the "registered" property 
// (see "Import XQuery"). If that index doesn't exist, disregard the ordering. 
// Checking for indexes at runtime is not a best practice for production code, 
// but is illustrative here.
var order = null;
try {
  order = cts.indexOrder(cts.jsonPropertyReference("registered"), ["descending"]);
} catch(err) {
  if("XDMP-ELEMRIDXNOTFOUND" !== err.name) { throw err; }
}

// Create an empty Array to accumulate the results.
var results = [];
for(
  // Use subsequence for efficient pagination (limit/skip)
  var item of fn.subsequence(
    // Run the search out of the indexes, using the order specification above
    cts.search(query, ["unfiltered", order]),
    // Just get the top 3.
    1, 3
  )
) {
  // Synthetic wrapper to hold projected fields and metadata from the search results.
  var obj = { 
    // The Node instance reports the relevance score of each search result.
    relevanceScore: item.score 
  };
  // Search returns a document node. Turn this into a JavaScript object.
  item = item.toObject(); 
  // Add properties we care about to the result object
  ["guid", "name", "isActive", "about"].forEach(function(prop) {
    obj[prop] = item[prop];
  });
  // Get the count of the tags rather than the list.
  obj.tagCount = item.tags.length;
  results.push(obj);
}
results;

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Contents

Server-side JavaScript

Search