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Difference between revisions of "Elite Document Structure"

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Questions on this database can be found here [[MAPREDUCE elite]], [[more elite]]
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Questions on this database can be found here: [[MAPREDUCE elite]]
 
==Elite Dangerous==
 
==Elite Dangerous==
 
Keys used in this database.
 
Keys used in this database.
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     commodities:  
 
     commodities:  
 
         _id, average_price, category, name
 
         _id, average_price, category, name
 +
 
     systems:  
 
     systems:  
 
         _id, allegiance, faction, government, name, population, primary_economy, security, state, stations, updated_at, x, y, z
 
         _id, allegiance, faction, government, name, population, primary_economy, security, state, stations, updated_at, x, y, z
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</pre>
 
</pre>
Unlike the <code>world</code> collection, <code>null</code> and empty values are not stored in this database.<br/>
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Unlike the '''world''' collection, <syntaxhighlight lang="JavaScript" inline>null</syntaxhighlight> and empty values are not stored in this database.<br/>
This means that some documents will have fields that others do not: Some systems will be uninhabited and have no stations. Some stations will have no listings.<br/>
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This means that some documents will have fields that others do not. Some systems will be uninhabited and have no stations and some stations will have no listings.<br/><br/>
To query null <b>or</b> non-existant fields use <code><field>: None</code>. In Mongo shell <code><field>: null</code> will also work.<br/><br/>
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To query <syntaxhighlight lang="JavaScript" inline>null</syntaxhighlight> '''or''' non-existent fields use <syntaxhighlight lang="JavaScript" inline><field>: None</syntaxhighlight>. or <syntaxhighlight lang="JavaScript" inline><field>: "null"</syntaxhighlight><br/><br/>
The average <code>commodities</code> document looks something like this.
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A typical <code>commodities</code> document looks something like this.
<pre>
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<syntaxhighlight lang="JavaScript">
 
{
 
{
 
         "_id" : ObjectId("55af74e7402aa43f1ce7e3a3"),
 
         "_id" : ObjectId("55af74e7402aa43f1ce7e3a3"),
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         "category" : "Chemicals"
 
         "category" : "Chemicals"
 
}
 
}
</pre>
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</syntaxhighlight>
<code>systems</code> is much bigger, so some stations and listings have been removed from this example document to make it shorter.
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'''systems''' is much bigger, so some stations and listings have been removed from this example document to make it shorter.
<pre>
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*The system '''Kappa Cygni''' has two stations '''Kensey Ring''' and '''Hauck Enterprise'''.
 +
*At Kensey Ring you can buy the commodity '''Hydrogen Fuel''' for 93 credits per ton, you can sell it is 89 credits.
 +
*You cannot buy '''Mineral Oil''' there but you can sell it at 326.
 +
<syntaxhighlight lang="JavaScript">
 +
> db.systems.findOne({"name":"1 Kappa Cygni"}) // Query
  
> db.systems.findOne({"name":"1 Kappa Cygni"})
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// Result
 
{
 
{
 
         "_id" : ObjectId("55b0edf6369fd5074b349c48"),
 
         "_id" : ObjectId("55b0edf6369fd5074b349c48"),
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         "population" : 24843190
 
         "population" : 24843190
 
}
 
}
</pre>
+
</syntaxhighlight>

Latest revision as of 13:55, 17 October 2018

Questions on this database can be found here: MAPREDUCE elite

Elite Dangerous

Keys used in this database.

    commodities: 
        _id, average_price, category, name

    systems: 
        _id, allegiance, faction, government, name, population, primary_economy, security, state, stations, updated_at, x, y, z

    systems.stations: 
        allegiance, distance_to_star, economies, export_commodities,has_blackmarket, has_commodities, has_rearm, has_repair,
        has_shipyard, has_outfitting, faction, government, listings, max_landing_pad, name, state, type, updated_at

    systems.stations.listings: 
        buy_price, collected_at, demand, commodity, sell_price, supply, update_count
        

Unlike the world collection, null and empty values are not stored in this database.
This means that some documents will have fields that others do not. Some systems will be uninhabited and have no stations and some stations will have no listings.

To query null or non-existent fields use <field>: None. or <field>: "null"

A typical commodities document looks something like this.

{
        "_id" : ObjectId("55af74e7402aa43f1ce7e3a3"),
        "name" : "Explosives",
        "average_price" : 267,
        "category" : "Chemicals"
}

systems is much bigger, so some stations and listings have been removed from this example document to make it shorter.

  • The system Kappa Cygni has two stations Kensey Ring and Hauck Enterprise.
  • At Kensey Ring you can buy the commodity Hydrogen Fuel for 93 credits per ton, you can sell it is 89 credits.
  • You cannot buy Mineral Oil there but you can sell it at 326.
> db.systems.findOne({"name":"1 Kappa Cygni"}) // Query

// Result
{
        "_id" : ObjectId("55b0edf6369fd5074b349c48"),
        "stations" : [
                {
                        "max_landing_pad_size" : "M",
                        "has_blackmarket" : 0,
                        "has_commodities" : 1,
                        "updated_at" : 1434929486,
                        "has_outfitting" : 0,
                        "government" : "Democracy",
                        "has_shipyard" : 0,
                        "type" : "Unknown Outpost",
                        "has_rearm" : 0,
                        "allegiance" : "Federation",
                        "has_refuel" : 1,
                        "name" : "Kinsey Ring",
                        "listings" : [
                                {
                                        "commodity" : "Hydrogen Fuel",
                                        "supply" : 129630,
                                        "collected_at" : 1421669319,
                                        "update_count" : "1",
                                        "buy_price" : 93,
                                        "sell_price" : 89,
                                        "demand" : 0
                                },
                                {
                                        "commodity" : "Mineral Oil",
                                        "supply" : 0,
                                        "collected_at" : 1421669320,
                                        "update_count" : "1",
                                        "buy_price" : 0,
                                        "sell_price" : 326,
                                        "demand" : 217674
                                }
                        ],
                        "distance_to_star" : 2359,
                        "economies" : [
                                "Industrial",
                                "Refinery"
                        ],
                        "has_repair" : 1
                },
                {
                        "max_landing_pad_size" : "M",
                        "has_blackmarket" : 1,
                        "has_commodities" : 0,
                        "updated_at" : 1434929486,
                        "has_outfitting" : 0,
                        "government" : "Anarchy",
                        "has_shipyard" : 0,
                        "type" : "Unknown Outpost",
                        "has_rearm" : 1,
                        "allegiance" : "Independent",
                        "has_refuel" : 1,
                        "name" : "Hauck Enterprise",
                        "distance_to_star" : 4832,
                        "economies" : [
                                "Industrial",
                                "Refinery"
                        ],
                        "has_repair" : 1
                }
        ],
        "name" : "1 Kappa Cygni",
        "faction" : "United 1 Kappa Cygni Future",
        "government" : "Democracy",
        "allegiance" : "Federation",
        "updated_at" : 1430938622,
        "state" : "None",
        "needs_permit" : 0,
        "y" : 37.78125,
        "x" : -117.75,
        "security" : "High",
        "z" : 11.1875,
        "primary_economy" : "Industrial",
        "population" : 24843190
}