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JavaScript Client Tutorial

A very quick tutorial combining the individual elements of the JavaScript how-to guides to get you started.
This guide demonstrates the basic use of the WOQLClient library to connect to TerminusDB with the JavaScript Client. Refer to TerminusDB JavaScript Client Reference Guide for detailed documentation.
The code discussed on this page is also available in full on GitHub - getting-started.js​
You can also find a comprehensive getting-started guide on GitHub: 5-Part JS Client Getting Started Guide.

Use a WOQLClient

Common uses of a WOQLClient include connecting to an existing database and creating a new database.

Connect to a database

Connect to an existing database using the example below.
JavaScript
client.db('ExampleDatabase');

Create a database

Create a new database using the example below.
JavaScript
const createNewDB = async () => {
try {
​
await client.createDatabase('ExampleDatabase', {
label: "ExampleDatabase",
comment: "Created new ExampleDatabase",
});
​
console.log("Database created Successfully!")c
​
} catch (err) {
console.error(err)
}
};
​
createNewDB();

Basic Commands

Create a schema and add documents to the schema by using the document interface. Refer to the Document Interface Reference Guide for more detail. After creating or connecting to a database, create a schema to add and retrieve data. A simple player roster is used as an example. Using Player roster data, the steps below are demonstrated.
  • Create a schema
  • Add a schema
  • Add documents
  • Get documents
  • Query documents
Data: Player roster
name | position
------ | --------
George | Center Back
Doug | Full Back
Karen | Center Forward
Code: Create a schema
Create a schema object with properties name and position. The object is uniquely identified by name.
JavaScript
const schema = { "@type" : "Class",
"@id" : "Player",
"@key" : { "@type": "Lexical", "@fields": ["name"] },
name : "xsd:string",
position: "xsd:string" };
Code: Add a schema
Add the schema object to the database.
JavaScript
Add the schema object to a document using addDocument which returns a Promise.
await client.addDocument(schema, { graph_type: "schema" })
Code: Add documents
Once a schema is added, add documents corresponding to the schema.
JavaScript
Add documents to the schema using addDocument which returns a Promise.
const objects = [
{
"@type" : "Player",
name : "George",
position: "Center Back",
},
{
"@type" : "Player",
name : "Doug",
position: "Full Back",
},
{
"@type" : "Player",
name : "Karen",
position: "Center Forward"
}
];
await client.addDocument(objects);
Code: Get documents
Get a list of documents or specific documents added to the schema
JavaScript
Get a list of documents using getDocument as_list. Results, stored in document, are shown further below.
const getDocs = async () => {
const documents = await client.getDocument({ as_list: "true" });
console.log("All Documents", documents)
}
[
{
'@id' : 'Player/Doug',
'@type' : 'Player',
name : 'Doug',
position: 'Full Back'
},
{
'@id' : 'Player/George',
'@type' : 'Player',
name : 'George',
position: 'Center Back'
},
{
'@id' : 'Player/Karen',
'@type' : 'Player',
name : 'Karen',
position: 'Center Forward'
}
]
Code: Query documents
Get a list of documents that matches the query
JavaScript
Get a list of documents using getDocument as_list. Results, stored in document, are shown further below.
const queryDocuments = async () => {
const query = {
"type": "Player",
"query": { "position": "Full Back" },
}
const result = await client.queryDocument(query,{"as_list":true});
console.log("Query Documents",result)
}
[{"@type" : "Player",
"name" : "Doug",
"position" : "Full Back"}]
Code: Query documents using WOQL
Query documents using Web Object Query Language (WOQL) to get the same result given by the above example. You can find more about WOQL here.
JavaScript
Get documents using using WOQL.triple() to create a WOQL query then execute that query using client.query(). Results, stored in results, are shown further below
const queryDocuments = async () => {
const { WOQL } = TerminusDBClient;
const query = WOQL.triple(
"v:Player",
"position",
WOQL.string("Full Back")
).triple("v:Player", "position", "v:position");
const results = await client.query(query);
console.log("Query Documents using WOQL: ",results.bindings);
}
[
{
Player: 'Player/Doug',
position: { '@type': 'xsd:string', '@value': 'Full Back' }
}
]
The following code segments demonstrate creating relationships or links between documents
Code: Create schema for team
The Team object is uniquely identified by the property name. The players property consists of a set of Player classes that create a link between theTeam and Player schema.
Javascript
const team_schema = [
{
"@type" : "Class",
"@id" : "Team",
"@key" : {
"@type": "Lexical",
"@fields": ["name"]
},
name : "xsd:string",
players: { "@type" : "Set",
"@class" : "Player" },
}
];
Code: Add a schema
Add the schema object to the database.
JavaScript
Add the schema object to a document using addDocument that returns a Promise.
await client.addDocument(team_schema, { graph_type: "schema" })
Code: Add documents
Add documents corresponding to the Team schema.
JavaScript
const team_instance = [
{
"@type" : "Team",
name : "Wildcats",
players: ["Player/Doug", "Player/Karen"],
},
{
"@type" : "Team",
name : "Donkeys",
players: ["Player/George"],
}
]
​
await client.addDocument(team_instance)
Code: Get all of the teams
Get a list of Team documents.
JavaScript
const getTeams = async () => {
const query = {
"type": "Team",
};
const result = await client.queryDocument(query, {"as_list":true});
console.log("Teams ",result)
}

See also

​
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Use the Python Client
Last modified 23d ago