Dgraph Example Queries

Dgraph Example Queries (JSON)

Hello, coders! In this page I’ve gather different Dgraph example queries.

Most of the examples are taken or extended version of examples from https://tour.dgraph.io/.

Follow this and this to create a schema and load an example data.

For more information on Dgraph.io and it’s usage with Go check my another article called “Dgraph Graph Database: How to Install and Use With Go?”.

Query #1: find by name

{
  find_michael(func: eq(name@., "Michael")) {
    uid
    name@.
    age
  }
}

Query #2: get by name and show related edges

{
  michaels_friends(func: eq(name, "Michael")) {
    name
    age
    owns_pet {
      name@.
    }
    friend {
      name@.
    }
  }
}

Query #3: get schema information

schema(pred: [name, age, friend, owns_pet]) {
  type
  index
}

By adding type and index in body we request to include type and index information about the scheme in the response.

Query #4: get by annotated language tag

{
  language_support(func: allofterms(name@hi, "अमित")) {
    name@bn:hi:en
    age
    friend {
      name@ko:ru
      age
    }
  }
}

Syntax name@bn:hi:en specifies an order preference in which name field must be returned. More information here.

Query #5: get all nodes count by a specific field name

{
  nodeCount(func: has(<message>)) {
    nodeCount: count(uid)
  }
}

Query #6: get all nodes related to a specific type

{
    q(func: type(Log)) {
      uid
      created
    	message
    }
}

Query #7: query and filter by field’s type

{
  q(func: has(parent)) {
    uid
    parent @filter(type(Person)) {
      uid
      name
    }
  }
}

Check source for more information.