Create queries
Most types in your schema will just be normal object types, but there are two types that are special, the Query type and the Mutation type. Every GraphQL service has at least one query type. Mutation types are optional.
Queries
type Query {
bookByTitleAndIsbn(title:String!, isbn:String): [Book] (1)
readerByNameAndUserid(name:String!, user_id:Uuid): [Reader] (2)
}| 1 | This query is named bookByTitleAndIsbn, with inputs title (non-null String value) and isbn (String value),
and outputs an array of objects of type Book. |
| 2 | This query is named readerByNameAndUserid, with inputs name (non-null String value) and user_id (Uuid value),
and outputs an array of objects of type Reader. |