Spring boot: GraphQL: Types

GraphQL support below scalar data types.

Type	Description
Int	Represent a signed 32‐bit integer.
Float	Represent a signed double-precision floating-point value.
String	Represent a UTF‐8 character sequence.
Boolean	Represent true or false
ID	Represent a unique identifier. It is used to refetch an object or as the key for a cache. The ID type is serialized in the same way as a String; however, defining it as an ID signifies that it is not intended to be human‐readable.

You can even define custom type using ‘type’ keyword.

type Address {
  id: Int
  city: String
  state: String
  country: String
}

You can refer custom types in other types definition.

type Query {
    employees: [Employee]
}

type Employee {
    id: Int
    firstName: String
    lastName: String
    email: String
    permanentAddress: Address
    temporaryAddress: Address
    department: Department
}

type Address {
  id: Int
  city: String
  state: String
  country: String
}

type Department{
  id: Int
  departmentName: String
}

For example, Employee type refer Address and Department types.

Support of enum types

GraphQL also support enums. Enums are special kind of scalar that is restricted to a particular set of allowed values.

enum day {
  MONDAY
  TUESDAY
  WEDNESDAY
  THURSDAY
  FRIDAY
  SATURDAY
  SUNDAY
}

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