Add SQL examples

Author: Oracle Public Cloud User

MongoExamples/SpringBoot/README.md

@@ -139,6 +139,100 @@ curl -i http://localhost:8080/station/120
  ...
 ```
 
+# SQL/JSON
 
+The following are examples of SQL/JSON that can be run 
+over the `station` and `status` collections.  These queries
+can be executed in Database Actions as described in [Lab 4](https://oracle.github.io/learning-library/data-management-library/database/json/mongodb-api/workshops/freetier/index.html?lab=dbactions).
 
+Select the JSON documents as text:
+
+```
+select json_serialize(data)
+from station
+```
+
+Project fields as columns:
+
+```
+select 
+  s.id,
+  s.data.name.string(),
+  s.data.region_id.string(),
+  s.data.lat.number(),
+  s.data.lon.number(),
+  s.data.station_type.string()
+from station s;
+```
+
+Group stations by `region_id`:
+
+```
+select 
+  t.data.region_id.string() as region_id,
+  count(*) as count
+from station t
+where t.data.station_type.string() = 'classic'
+group by t.data.region_id.string();
+```
+
+Automatically create relational views using `json_dataguide`:
+
+```
+declare
+  dg clob;
+begin
+  select json_dataguide(data, dbms_json.FORMAT_HIERARCHICAL, dbms_json.pretty) into dg
+  from station;
+
+  dbms_json.create_view('STATION_VIEW', 'STATION', 'DATA', dg, resolveNameConflicts => true, path => '$._id');
+
+  select json_dataguide(data, dbms_json.FORMAT_HIERARCHICAL, dbms_json.pretty) into dg
+  from status;
+
+  dbms_json.create_view('STATUS_VIEW', 'STATUS', 'DATA', dg);
+end;
+/
+```
+
+Select from the created view:
+
+```
+select * from station_view;
+```
+
+Join between collections:
+
+```
+select 
+  s."station_id" station_id,
+  (select t."capacity" from station_view t where t."_id" = s."station_id") capacity,
+  min(s."num_bikes_available") min,
+  max(s."num_bikes_available") max,
+  round(avg(s."num_bikes_available")) avg
+from status_view s
+group by s."station_id";
+```
+
+```
+create view station_availability as
+select 
+  s."station_id" station_id,
+  (select t."capacity" from station_view t where t."_id" = s."station_id") capacity,
+  min(s."num_bikes_available") min,
+  max(s."num_bikes_available") max,
+  round(avg(s."num_bikes_available")) avg
+  from status_view s
+group by s."station_id";
+```
+
+Select stations that always had more than half capacity available:
+
+```
+select station_id, min, max, avg, capacity
+from station_availability
+where (capacity - min) < (capacity / 2) and
+      capacity > 55
+      order by min desc;
+```
 

MongoExamples/SpringBoot/src/main/java/example/model/Station.java

@@ -11,104 +11,104 @@
  * @see https://github.com/NABSA/gbfs/blob/master/gbfs.md#station_information
  */
 public class Station {
-    
+
     @Id
     String id;
-    
+
     String name;
-    
+
     String region_id;
-    
-    double lon,lat;
-    
+
+    double lon, lat;
+
     boolean eightd_has_key_dispenser;
-    
+
     String legacy_id;
-    
+
     List<String> rental_methods;
-    
+
     String external_id;
-    
+
     int capacity;
-    
+
     String short_name;
-    
+
     boolean electric_bike_surcharge_waiver;
-    
+
     String station_type;
-    
+
     List<String> eightd_station_services;
 
     boolean has_kiosk;
-    
+
     Map<String, String> rental_uris;
-    
+
     public Station() {
-        
+
     }
 
-	public String getId() {
-		return id;
-	}
+    public String getId() {
+        return id;
+    }
 
-	public String getName() {
-		return name;
-	}
+    public String getName() {
+        return name;
+    }
 
-	public String getRegion_id() {
-		return region_id;
-	}
+    public String getRegion_id() {
+        return region_id;
+    }
 
-	public double getLon() {
-		return lon;
-	}
+    public double getLon() {
+        return lon;
+    }
 
-	public double getLat() {
-		return lat;
-	}
+    public double getLat() {
+        return lat;
+    }
 
-	public boolean isEightd_has_key_dispenser() {
-		return eightd_has_key_dispenser;
-	}
+    public boolean isEightd_has_key_dispenser() {
+        return eightd_has_key_dispenser;
+    }
 
-	public String getLegacy_id() {
-		return legacy_id;
-	}
+    public String getLegacy_id() {
+        return legacy_id;
+    }
 
-	public List<String> getRental_methods() {
-		return rental_methods;
-	}
+    public List<String> getRental_methods() {
+        return rental_methods;
+    }
 
-	public String getExternal_id() {
-		return external_id;
-	}
+    public String getExternal_id() {
+        return external_id;
+    }
 
-	public int getCapacity() {
-		return capacity;
-	}
+    public int getCapacity() {
+        return capacity;
+    }
 
-	public String getShort_name() {
-		return short_name;
-	}
+    public String getShort_name() {
+        return short_name;
+    }
 
-	public boolean isElectric_bike_surcharge_waiver() {
-		return electric_bike_surcharge_waiver;
-	}
+    public boolean isElectric_bike_surcharge_waiver() {
+        return electric_bike_surcharge_waiver;
+    }
 
-	public String getStation_type() {
-		return station_type;
-	}
+    public String getStation_type() {
+        return station_type;
+    }
 
-	public List<String> getEightd_station_services() {
-		return eightd_station_services;
-	}
+    public List<String> getEightd_station_services() {
+        return eightd_station_services;
+    }
 
-	public boolean isHas_kiosk() {
-		return has_kiosk;
-	}
+    public boolean isHas_kiosk() {
+        return has_kiosk;
+    }
 
-	public Map<String, String> getRental_uris() {
-		return rental_uris;
-	}
+    public Map<String, String> getRental_uris() {
+        return rental_uris;
+    }
 
 }

MongoExamples/SpringBoot/src/main/java/example/repository/StatusRepository.java

@@ -2,7 +2,6 @@
 
 import java.util.List;
 
-import org.springframework.boot.autoconfigure.web.WebProperties.Resources;
 import org.springframework.data.mongodb.repository.MongoRepository;
 import org.springframework.data.mongodb.repository.Query;
 import org.springframework.data.rest.core.annotation.RepositoryRestResource;