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ARANGODB AQL FUNCTIONS HOW TO
ARANGODB AQL FUNCTIONS UPDATE

It will then run an AQL query that will update each document in the collection, using one of the named AQL functions. The originally proposed syntax (separate arguments for needles and replacement values) would be more in line with the string function SUBSTITUTE(). Here is a test function that will create a collection named test and populate it with a configurable amount documents. There are edge cases here as well however. what if there are more replacement values than needles? they should probably be ignored.Īnother way would be to provide pairs, . AQL is mainly a declarative language and allows the combination of different data access patterns in a single query.It can be used to return a static value, such as a string: RETURN Hello.

what if there are more needles than replacement values? Should the needle values be removed from the input, replaced by null, or simply be ignored? Retrieving data from the database with AQL does always include a RETURN operation.

ARANGODB AQL FUNCTIONS HOW TO

This chapter also describes how to use bind parameters, statistics, counting and cursors with arangosh. You can run AQL queries from the ArangoDB Shell with the query and createStatement methods of the db object. ? The second "red" should probably be ignored The ArangoDB Web Interface has a specific tab for AQL queries execution.

what if needles occur multiple times, e.g.

Then it is scanned for 1s, which are substituted by 4s: Īnother example: REPLACE_VALUES(, , ) -> Edge cases: So, is scanned for 3s, and they are replaced by 5s. The first element of the needles is searched in the haystack and replaced by the first element of the replacement value array and so on. In my example, REPLACE_VALUES(, , ) ->, the first array is the input (haystack). REPLACE_NTH() would be a special case of a SPLICE operation, SPLICE( anyArr, pos, 1, ). , true) // return index I guess, but we may as well think about implementing a SPLICE() function, which would allow to remove N elements starting at pos P and insert array A of new values. It would be convenient if combined with POSITION(. numArray (array): an array of numbers, null values are ignored returns mean (numbernull): the. Replace value at specific index with another value Return the average (arithmetic mean) of the values in array. You may check out the related API usage on the sidebar.

REPLACE_VALUES(anyArray, values, newValues)Īll 3 being arrays, e.g. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example.

REPLACE_VALUE(anyArray, value, newValue, limit).