GraphQL学习第五篇－GraphQl中定义schema实现增、删、改、查

const DB &＃61; require(&＃39;../model/db.js&＃39;);const {GraphQLObjectType,GraphQLString,GraphQLInt,GraphQLList,GraphQLSchema,GraphQLID,GraphQLFloat,GraphQLNonNull
} &＃61; require(&＃39;graphql&＃39;)// 定义导航的schema&＃xff0c;映射要操作表的字段
var NavSchema &＃61; new GraphQLObjectType({name: &＃39;nav&＃39;,fields: {_id: { type: GraphQLString },title: {type: GraphQLString}, url: {type: GraphQLString},sort: {type: GraphQLInt},status: {type: GraphQLString},add_time: {type: GraphQLString}}
})// 定义一个根,配置查询的方法
var RootSchema &＃61; new GraphQLObjectType({name: &＃39;root&＃39;,fields: {navList: {type: GraphQLList(NavSchema),async resolve(parent, args) {var navList &＃61; await DB.find(&＃39;nav&＃39;, {});return navList;}},oneNavList: {type: NavSchema,args: {_id: {type: GraphQLString}},async resolve(parent, args) {var oneNavList &＃61; await DB.find(&＃39;nav&＃39;, { "_id": DB.getObjectId(args._id)});return oneNavList[0];}}}
})// 定义一个根,配置增加、修改、删除的方法
var MutationSchema&＃61;new GraphQLObjectType({name:"mutation",fields:{// 添加的方法addNav:{// 数据类型type:NavSchema,// 接收的参数args:{title: {type: new GraphQLNonNull(GraphQLString)},url: {type: GraphQLNonNull(GraphQLString)},sort: {type: GraphQLInt},status: {type: GraphQLString},add_time: {type: GraphQLString}},// 操作的方法async resolve(parent, args) {var result &＃61; await DB.insert(&＃39;nav&＃39;, {title:args.title,url:args.url,sort:args.sort,status:args.status,add_time:new Date().getTime()});return result.ops[0];}},// 编辑的方法editNav:{type:NavSchema,args:{// GraphQLNonNull代表必传字段_id:{type: new GraphQLNonNull(GraphQLString)},title: {type: new GraphQLNonNull(GraphQLString)}, url: {type: GraphQLNonNull(GraphQLString)},sort: {type: GraphQLInt},status: {type: GraphQLString},add_time: {type: GraphQLString}},async resolve(parent, args) {await DB.update(&＃39;nav&＃39;, {"_id":DB.getObjectId(args._id)},{title:args.title,url:args.url,sort:args.sort,status:args.status,add_time:new Date().getTime()});return {_id:args._id,title:args.title,url:args.url,sort:args.sort,status:args.status,add_time:new Date().getTime()}}},deleteNav:{type:NavSchema,args:{_id:{type: new GraphQLNonNull(GraphQLString)},},async resolve(parent, args) {var oneNavList &＃61; await DB.find(&＃39;nav&＃39;, { "_id": DB.getObjectId(args._id)});var deleteResult &＃61; await DB.remove(&＃39;nav&＃39;, {"_id":DB.getObjectId(args._id)});// 用影响的行业来判断是否成功if(deleteResult.result.n){return oneNavList[0]; }else{return {}}}} }
})// 将定义的所有的根&＃xff0c;挂载到GraphQLSchema上
module.exports &＃61; new GraphQLSchema({query: RootSchema,mutation:MutationSchema
})