GraphQL我的理解是，原来传统restful返回的json，只能是服务端返回来什么，客户端调用什么，而GraphQL的优势就是，由客户端来决定，我要什么参数，你服务端给我返什么参数。这是获取数据主动权的变更吧我个人认为。
这里记录一下GraphQL和springboot+mybatis整合的过程，方便以后查看，如有错误或者不足的地方，欢迎指出。
首先添加GraphQL依赖
<dependency> <groupId>com.graphql-java</groupId> <artifactId>graphql-spring-boot-starter</artifactId> <version>4.0.0</version> </dependency> <dependency> <groupId>com.graphql-java</groupId> <artifactId>graphiql-spring-boot-starter</artifactId> <version>4.0.0</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.9</version> </dependency> <!-- https://mvnrepository.com/artifact/com.google.code.gson/gson --> <dependency> <groupId>com.google.code.gson</groupId> <artifactId>gson</artifactId> <version>2.8.4</version> </dependency>
controller层代码
package top.glory.controller;
import static graphql.Scalars.GraphQLInt;
import static graphql.Scalars.GraphQLString;
import static graphql.schema.GraphQLFieldDefinition.newFieldDefinition;
import static graphql.schema.GraphQLObjectType.newObject;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import graphql.GraphQL;
import graphql.schema.DataFetcher;
import graphql.schema.DataFetchingEnvironment;
import graphql.schema.GraphQLArgument;
import graphql.schema.GraphQLFieldDefinition;
import graphql.schema.GraphQLList;
import graphql.schema.GraphQLObjectType;
import graphql.schema.GraphQLSchema;
import top.glory.pojo.User;
import top.glory.service.UserService;
@RestController
public class GraphQLController {
@Autowired
private UserService userService;
@GetMapping("/testGetGraphQL")
public Object testGetGraphQL(String query){
//查询全部（主子表 这里是一张user表，一张book表）
List<User> list = userService.findAllUserAndBook();
//创建book查询type
GraphQLObjectType bookType = newObject()
.name("book")
.field(newFieldDefinition()
.name("bid")
.type(GraphQLInt))
.field(newFieldDefinition()
.name("userid")
.type(GraphQLInt))
.field(newFieldDefinition()
.name("bookname")
.type(GraphQLString))
.field(newFieldDefinition()
.name("bookprice")
.type(GraphQLInt))
.build();
//创建user查询type
GraphQLObjectType userType = newObject()
.name("user")
.field(newFieldDefinition()
.name("id")
.type(GraphQLInt))
.field(newFieldDefinition()
.name("username")
.type(GraphQLString))
.field(newFieldDefinition()
.name("password")
.type(GraphQLString))
.field(newFieldDefinition()
.name("book") //这里是子表的type name
.type(new GraphQLList(bookType))) //这里是字表的type
.build();
//获取请求参数中id
GraphQLFieldDefinition personDefinition =
GraphQLFieldDefinition.newFieldDefinition()
.name("user")
.type(userType)
.argument(GraphQLArgument.newArgument().name("id").type(GraphQLInt))
.dataFetcher(new DataFetcher() {
public Object get(DataFetchingEnvironment dataFetchingEnvironment) {
int id = dataFetchingEnvironment.getArgument("id");
for (User user : list) {
if (user.getId() == id) {
return user;
}
}
return null;
}
})
.build();
//创建schema，用于执行查询
GraphQLSchema schema = GraphQLSchema.newSchema()
.query(newObject()
.name("userQuery")
.field(personDefinition)
.build())
.build();
//传入schema，执行查询
GraphQL graphQL = GraphQL.newGraphQL(schema).build();
//返回查询结果集
Object data = graphQL.execute(query).getData();
return data;
}
}
接下来是service层和dao层，这里就不在列举，查询就是两张表联查
映射文件sql语句
<select id="findAllUserAndBook" resultMap="usermap"> SELECT * FROM USER LEFT JOIN book ON user.id = book.userid </select>
<resultMap type="top.glory.pojo.User" id="usermap"> <id property="id" column="id"/> <result property="username" column="username"/> <result property="password" column="password"/> <collection property="book" ofType="top.glory.pojo.Book"> <id property="bid" column="bid"/> <result property="userid" column="userid"/> <result property="bookname" column="bookname"/> <result property="bookprice" column="bookprice"/> </collection> </resultMap>
这里附上数据库脚本
/*
Navicat MySQL Data Transfer
Source Server : localhost
Source Server Version : 50536
Source Host : localhost:3306
Source Database : school
Target Server Type : MYSQL
Target Server Version : 50536
File Encoding : 65001
Date: 2018-05-11 17:54:28
*/
SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for book
-- ----------------------------
DROP TABLE IF EXISTS `book`;
CREATE TABLE `book` (
`bid` int(11) NOT NULL AUTO_INCREMENT,
`userid` int(11) DEFAULT NULL,
`bookname` varchar(255) DEFAULT NULL,
`bookprice` float(5,2) DEFAULT NULL,
PRIMARY KEY (`bid`)
) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of book
-- ----------------------------
INSERT INTO `book` VALUES ('1', '1', '葵花宝典', '5.22');
INSERT INTO `book` VALUES ('2', '1', '辟邪剑谱', '63.23');
INSERT INTO `book` VALUES ('3', '1', '独孤九剑', '999.99');
INSERT INTO `book` VALUES ('4', '2', '吸星大法', '656.32');
INSERT INTO `book` VALUES ('5', '2', '龙抓手', '999.99');
INSERT INTO `book` VALUES ('6', '3', '九阳神功', '3.00');
INSERT INTO `book` VALUES ('7', '3', '易筋经', '231.60');
INSERT INTO `book` VALUES ('8', '3', '西联剑典', '123.00');
INSERT INTO `book` VALUES ('9', '3', '妈卖批', '999.99');
INSERT INTO `book` VALUES ('10', '1', 'ppp', '12.56');
-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(255) DEFAULT NULL,
`password` varchar(255) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES ('1', '张三', '123');
INSERT INTO `user` VALUES ('2', '李四', '1234');
INSERT INTO `user` VALUES ('3', '王五', '123123');
接下来就是测试了
这是我的测试路径，修改为自己的端口和方法即可。
query是参数名，后面是参数值，这里用get方式请求。
http://127.0.0.1:8888/testGetGraphQL?query={user(id:1){id,username,password,book{bid,bookname}}}
可以修改参数，http://127.0.0.1:8888/testGetGraphQL?query={user(id:1){id,username,book{bookname}}}
