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Readme.md

@@ -79,6 +79,7 @@ There exist following fields:
 - **aggregations**: Activates data aggregation. Array of requested aggregations (see [here](https://github.psi.ch/projects/ST/repos/ch.psi.daq.query/browse/src/main/java/ch/psi/daq/query/model/Aggregation.java) for possible values). These values will be added to the *data* array response.
 - **aggregationType**: Specifies the type of aggregation (see [here](https://github.psi.ch/projects/ST/repos/ch.psi.daq.query/browse/src/main/java/ch/psi/daq/query/model/AggregationType.java)). The default type is *value* aggregation (e.g., sum([1,2,3])=6). Alternatively, it is possible to define *index* aggregation for multiple arrays in combination with binning (e.g., sum([1,2,3], [3,2,1]) = [4,4,4]).
 - **aggregateChannels**: Specifies whether the data of the requested channels should be combined together using the defined aggregation (values: true|**false**) 
+- **dbMode**: Defines the database to access (values: **databuffer**|archiverappliance)
 
 
 ### Example
@@ -310,11 +311,11 @@ See JSON representation of the data above.
 
 ```
 {
+   "dbmode":"archiverappliance",
    "startMillis":0,
    "startNanos":0,
    "endMillis":30,
    "endNanos":999999,
-   "dbmode":"archiverappliance",
    "channels":[
       "Channel_01"
    ]
@@ -327,9 +328,83 @@ Archiver Appliance supports queries by *time range* and *date range* only (as it
 ###### Command
 
 ```bash
-curl -H "Content-Type: application/json" -X POST -d '{"startDate":"1970/01/01 01:00:00.000","startNanos":0,"endDate":"1970/01/01 01:00:00.030","endNanos":999999,"channels":["Channel_01"]}' http://sf-nube-14.psi.ch:8080/query
+curl -H "Content-Type: application/json" -X POST -d '{"dbmode":"archiverappliance","startMillis":0,"startNanos":0,"endMillis":30,"endNanos":999999,"channels":["Channel_01"]}' http://sf-nube-14.psi.ch:8080/query
 ```
 
 ###### Response
 
-See JSON representation of the data above. 
+See JSON representation of the data above. 
+
+
+
+##### Querying for Specific Fields
+
+Allows for server side optimizations since not all data needs to be retrieved.
+
+```
+{
+   "fields":["pulseId","value"]
+   "startPulseId":0,
+   "endPulseId":3,
+   "channels":[
+      "Channel_01"
+   ]
+}
+```
+
+Archiver Appliance supports queries by *time range* and *date range* only (as it has no notion about pulse-id).
+
+
+###### Command
+
+```bash
+curl -H "Content-Type: application/json" -X POST -d '{"fields":["pulseId","value"],"startPulseId":0,"endPulseId":3,"channels":["Channel_01"]}' http://sf-nube-14.psi.ch:8080/query
+```
+
+###### Response
+
+```json
+[
+   {
+      "channel":"Channel_01",
+      "data":[
+         {
+            "pulseId":0,
+            "value":[
+               1,
+               2,
+               3,
+               4
+            ]
+         },
+         {
+            "pulseId":1,
+            "value":[
+               2,
+               3,
+               4,
+               5
+            ]
+         },
+         {
+            "pulseId":2,
+            "value":[
+               3,
+               4,
+               5,
+               6
+            ]
+         },
+         {
+            "pulseId":3,
+            "value":[
+               4,
+               5,
+               6,
+               7
+            ]
+         }
+      ]
+   }
+]
+```