OrientDB : Single shot Query

Question

I have some doubts related to the queries in orientdb. I have below scenario:

Example :

   Performs    Uses          RunsOn    IsConnected

User --> Process --> Application --> Server --> Network

Here, User/Process/Application/Server/Network are Vertex Names
Performs/Uses/RunsOn/IsConnected are Edge Names / Relationship Names osType/applicationName are Attribute Names for related Vertex

Now, I want all the related combination result as per the input. If input is like osType of Server and applicationName of Application then i want all the details related to this two inputs like user and process and whatever is related to this applicationName and osType.

It is possible in orientdb to fetch out all this details in a single query ??

Luigi Dell'Aquila Luigi Dell'Aquila · Accepted Answer · 2017-04-18T13:51:58

If you want single columns

 MATCH
  {as:user} -Performs-> {as:process} -Uses->
  {class:Application, as:app, where:(applicationName = ?)} -RunsOn->
  {class:Server, as:server, where:(osType = ?)} -IsConnected-> {as:network}
 RETURN user.name, process.id, app.name, server.url, server.name, network.name

if you only need the RIDs of the involved elements:

 MATCH
   {as:user} -Performs-> {as:process} -Uses->
   {class:Application, as:app, where:(applicationName = ?)} -RunsOn-> 
   {class:Server, as:server, where:(osType = ?)} -IsConnected-> {as:network}
 RETURN user, process, app, server, network

If you also want all the details in line:

 SELECT user.* as user_, process.* as process_, app.* as app_, server.* as server_, network.* as network_ FROM (
   MATCH
     {as:user} -Performs-> {as:process} -Uses->
     {class:Application, as:app, where:(applicationName = ?)} -RunsOn->      
     {class:Server, as:server, where:(osType = ?)} -IsConnected-> {as:network}
   RETURN user, process, app, server, network
 )

The "as xxx_" will add a prefix to attributes, this is useful to avoid collisions, eg. if you have user.name and server.name, this way you will have "user_name" and "server_name"

If you don't need all the patterns, but you only need single records that are part of the result:

 MATCH
   {as:user} -Performs-> {as:process} -Uses->
   {class:Application, as:app, where:(applicationName = ?)} -RunsOn-> 
   {class:Server, as:server, where:(osType = ?)} -IsConnected-> {as:network}
 RETURN $elements

If you have multiple paths connected to the same node, you can use comma separated patterns, joined using aliases, eg.

MATCH
 {as:user} -Performs-> {as:process} -Uses->
 {class:Application, as:app, where:(applicationName = ?)} -RunsOn-> 
 {class:Server, as:server, where:(osType = ?)} -IsConnected-> {as:network},
 {as:server} -IsMountedOn-> {as:storage}
RETURN $elements

If one or more of the (terminal) connections is missing, you can define it as optional, eg. if the storage can be missing:

MATCH
 {as:user} -Performs-> {as:process} -Uses->
 {class:Application, as:app, where:(applicationName = ?)} -RunsOn-> 
 {class:Server, as:server, where:(osType = ?)} -IsConnected-> {as:network},
 {as:server} -IsMountedOn-> {as:storage, optional:true}
RETURN $elements

This works only on terminal nodes, ie. nodes that have only one connection.

Full reference here: http://orientdb.com/docs/2.2.x/SQL-Match.html

OrientDB : Single shot Query

1 Answers