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MarkLogic 9 Product Documentation
op:where

op:where(
   $plan as map:map,
   $condition as item()
) as map:map

Summary

This method restricts the row set to rows matched by the boolean expression. Use boolean composers such as op:and and op:or to combine multiple expressions.

A constraining document query returns only the rows from the matched source documents. If the constraining document query is a node instead of a cts:query object, the implementation calls the cts:query parser on the node. The constraining document query applies to all upstream accessors. A constraining sem:store returns only the triples from the specified store (potentially expanded by inference using a ruleset). A constraining sem:store applies to all upstream triples accessors.

Parameters
$plan The Optic Plan. You can either use the XQuery => chaining operator or specify the variable that captures the return value from the previous operation.
$condition This can be a boolean expression, a cts:query to qualify the source documents that produced the rows set, or (where part of the row set was produced by the op:from-triples accessor) a sem:store to restrict or expand the triples that produce the row set.

Example


xquery version "1.0-ml";

import module namespace op="http://marklogic.com/optic"
     at "/MarkLogic/optic.xqy";

let $employees := op:from-view("main", "employees")
let $expenses  := op:from-view("main", "expenses")
let $expenselimit  := op:from-view("main", "expenselimit")
return $employees
   => op:join-inner($expenses, op:on(
                op:view-col("employees", "EmployeeID"),
                op:view-col("expenses", "EmployeeID")))
   => op:join-inner($expenselimit, op:on(
                op:view-col("expenses", "Category"),
                op:view-col("expenselimit", "Category"))) 
   => op:where(op:gt(op:view-col("expenses", "Amount"),
                op:view-col("expenselimit", "Limit"))) 
   => op:select((op:view-col("employees", "EmployeeID"), 
                "FirstName", "LastName", 
                op:view-col("expenses", "Category"),
                op:view-col("expenses", "Amount"),
                op:view-col("expenselimit", "Limit")))
   => op:order-by(op:view-col("employees", "EmployeeID"))
   => op:result()

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