《7.》Resolver

AuthorResolver.java  用于解析字段

package com.hanchao.graphql.graphql.resolver;

import com.coxautodev.graphql.tools.GraphQLResolver;
import com.hanchao.graphql.graphql.entity.Author;
import com.hanchao.graphql.graphql.entity.Book;
import com.hanchao.graphql.graphql.repo.BookRepo;
import lombok.AllArgsConstructor;
import org.springframework.stereotype.Component;

import java.text.SimpleDateFormat;
import java.util.List;

/**
 * @author hanliwei
 * @create 2019-02-12 17:33
 */
@Component
@AllArgsConstructor
public class AuthorResolver implements GraphQLResolver<Author> {

    private static final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

    private BookRepo bookRepo;

    public String getCreatedTime(Author author) {
        return sdf.format(author.getCreatedTime());
    }

    public List<Book> getBooks(Author author) {
        return bookRepo.findByAuthorId(author.getId());
    }
}

BookResolver.java

package com.hanchao.graphql.graphql.resolver;

import com.coxautodev.graphql.tools.GraphQLResolver;
import com.hanchao.graphql.graphql.entity.Author;
import com.hanchao.graphql.graphql.entity.Book;
import com.hanchao.graphql.graphql.repo.AuthorRepo;
import lombok.AllArgsConstructor;
import org.springframework.stereotype.Component;


/**
 * @author hanliwei
 * @create 2019-02-12 17:36
 */
@Component
@AllArgsConstructor
public class BookResolver implements GraphQLResolver<Book> {

    private AuthorRepo authorRepo;

    public Author getAuthor(Book book) {
        return authorRepo.findAuthorById(book.getAuthorId());
    }
}

Mutation.java 

和root.graphqls文件的方法对应，用于更新操作

package com.hanchao.graphql.graphql.resolver;

import com.coxautodev.graphql.tools.GraphQLMutationResolver;
import com.hanchao.graphql.graphql.entity.Author;
import com.hanchao.graphql.graphql.entity.Book;
import com.hanchao.graphql.graphql.model.BookInput;
import com.hanchao.graphql.graphql.repo.AuthorRepo;
import com.hanchao.graphql.graphql.repo.BookRepo;
import lombok.AllArgsConstructor;
import org.springframework.stereotype.Component;

/**
 * @author hanliwei
 * @create 2019-02-12 18:58
 */
@Component
@AllArgsConstructor
public class Mutation implements GraphQLMutationResolver {
    private AuthorRepo authorRepo;
    private BookRepo bookRepo;

    public Author newAuthor(String firstName, String lastName) {
        Author author = new Author();
        author.setFirstName(firstName);
        author.setLastName(lastName);
        return authorRepo.save(author);
    }

    public Book newBook(String title, String isbn, int pageCount, Long authorId) {
        Book book = new Book();
        book.setTitle(title);
        book.setIsbn(isbn);
        book.setPageCount(pageCount);
        book.setAuthorId(authorId);
        return bookRepo.save(book);
    }


    public Book saveBook(BookInput input) {
        Book book = new Book();
        book.setTitle(input.getTitle());
        book.setIsbn(input.getIsbn());
        book.setPageCount(input.getPageCount());
        book.setAuthorId(input.getAuthorId());
        return bookRepo.save(book);
    }

    public Boolean deleteBook(Long id) {
        bookRepo.deleteById(id);
        return true;
    }

    public Book updateBookPageCount(int pageCount,long id) {
        Book book = bookRepo.findBookById(id);
        book.setPageCount(pageCount);
        return bookRepo.save(book);
    }

}

Query.java

和root.graphqls中的方法对应！用于查询操作

package com.hanchao.graphql.graphql.resolver;

import com.coxautodev.graphql.tools.GraphQLQueryResolver;
import com.hanchao.graphql.graphql.entity.Author;
import com.hanchao.graphql.graphql.entity.Book;
import com.hanchao.graphql.graphql.repo.AuthorRepo;
import com.hanchao.graphql.graphql.repo.BookRepo;
import lombok.AllArgsConstructor;
import org.springframework.stereotype.Component;

import java.util.List;

/**
 * @author hanliwei
 * @create 2019-02-12 18:00
 */
@Component
@AllArgsConstructor
public class Query implements GraphQLQueryResolver {

    private AuthorRepo authorRepo;

    private BookRepo bookRepo;

    public Author findAuthorById(Long id) {
        return authorRepo.findAuthorById(id);
    }

    public List<Author> findAllAuthors() {
        return authorRepo.findAll();
    }

    public Long countAuthors() {
        return authorRepo.count();
    }

    public List<Book> findAllBooks() {
        return bookRepo.findAll();
    }

    public Long countBooks() {
        return bookRepo.count();
    }
}

#查询入口
type Query {
    ####### Author相关 #########
    findAuthorById(id:Long!): Author

    findAllAuthors: [Author]!

    countAuthors: Long!

    ####### Book相关 #########
    findAllBooks: [Book]!
    countBooks: Long!
}

type Mutation {
    newAuthor(firstName: String!,lastName: String!) : Author!

    newBook(title: String!,isbn: String!,pageCount: Int, authorId: Long!) : Book!
    saveBook(input: BookInput!) : Book!
    deleteBook(id: ID!) : Boolean
    updateBookPageCount(pageCount: Int!, id:Long!) : Book!
}

type Author {
    #作者Id
    id: Long!
    #创建时间
    createdTime: String
    #名
    firstName: String
    #姓
    lastName: String
    #该作者的所有书籍
    books: [Book]
}

input BookInput {
    title: String!
    isbn: String!
    pageCount: Int
    authorId: Long
}

type Book {
    id: Long!
    title: String!
    isbn: String!
    pageCount: Int
    author: Author
}