The output of the driver depends on the specific request made. Some methods, like uql(), return a Response object, which requires you to extract the data and cast it into the corresponding driver type to serve the Java application. Other methods, like showGraph(), showSchema(), and showProperty(), return data of the driver type (GraphSet, Schema, Property, etc.) directly. Please read Types Mapping Ultipa and Java for a list of the core driver types.
Response
The uql() and some other methods return a Response object. Response has the following fields:
Field |
Type |
Description |
|---|---|---|
aliases |
List<Alias> | List of aliases; each has name and type of the data. |
items |
Map<String, DataItem> | Map of aliases and their corresponding data (DataItem). |
insertNodesReply |
Ultipa.InsertNodesReply | Result of batch node insertions. |
insertEdgesReply |
Ultipa.InsertEdgesReply | Result of batch edge insertions. |
exportData |
ExportData | Result of data export operations. |
explainPlan |
ExplainPlan | Explanation tree for the UQL statement. |
status |
Status | Execution status of the request. |
statistic |
Statistic | Statistics of the request execution, including nodeAffected, edgeAffected, totalCost, engineCost, etc. |
If the query returns data, you can extract each item by its alias using the get() or alias() method. Both methods return a DataItem object, which embeds the query result. To map the DataItem to the corresponding driver type, please read Types Mapping Ultipa and Java.
get()
Retrieves data by the alias index.
Parameters:
Integer: Index of the alias.
Returns:
DataItem: The retrieved data.
Response response = client.uql("find().nodes() as n return n._id, n._uuid limit 3");
System.out.println(response.get(0).toJson());
The UQL statement returns two aliases n._id and n._uuid; the get() method retrieves the alias n._id at index 0.
["{\"type\":\"STRING\",\"values\":[\"u604131\",\"u604510\",\"u604614\"],\"name\":\"n._id\"}"]
alias()
Retrieves data by the alias name.
Parameters:
String: Name of the alias.
Returns:
DataItem: The retrieved data.
Response response = client.uql("find().nodes() as n return n._id, n._uuid limit 3");
System.out.println(response.alias("n._uuid").toJson());
The UQL statement returns two aliases n._id and n._uuid; the alias() method retrieves the alias n._uuid by its name.
["{\"type\":\"UINT64\",\"values\":[\"1\",\"2\",\"3\"],\"name\":\"n._uuid\"}"]