feat:添加代码

+# Default ignored files
+/shelf/
+/workspace.xml
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
+# Editor-based HTTP Client requests
+/httpRequests/

+<?xml version="1.0" encoding="UTF-8"?>
+<module type="WEB_MODULE" version="4">
+  <component name="Go" enabled="true" />
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/go-graphql-api.iml" filepath="$PROJECT_DIR$/.idea/go-graphql-api.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectTasksOptions">
+    <enabled-global>
+      <option value="go fmt" />
+      <option value="goimports" />
+      <option value="golangci-lint" />
+    </enabled-global>
+  </component>
+</project>
\ No newline at end of file

+
+```
+├── gql
+│   ├── gql.go
+│   ├── queries.go
+│   ├── resolvers.go
+│   └── types.go
+├── main.go
+├── postgres
+│   └── postgres.go
+└── server
+    └── server.go
+```

+module go-graphql-api
+
+go 1.15
+
+require (
+	github.com/astaxie/beego v1.12.3
+	github.com/bradford-hamilton/go-graphql-api v0.0.0-20200517010519-dae980f02612
+	github.com/cosmtrek/air v1.21.2 // indirect
+	github.com/creack/pty v1.1.11 // indirect
+	github.com/fatih/color v1.10.0 // indirect
+	github.com/go-chi/chi v3.3.3+incompatible
+	github.com/go-chi/render v1.0.1
+	github.com/graphql-go/graphql v0.7.9
+	github.com/imdario/mergo v0.3.11 // indirect
+	github.com/lib/pq v1.9.0 // indirect
+	github.com/pelletier/go-toml v1.8.1 // indirect
+	golang.org/x/sys v0.0.0-20210122093101-04d7465088b8 // indirect
+)

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+package gql
+
+import (
+	"fmt"
+
+	"github.com/graphql-go/graphql"
+)
+
+func ExecuteQuery(query string, schema graphql.Schema) *graphql.Result {
+	result := graphql.Do(graphql.Params{
+		Schema:        schema,
+		RequestString: query,
+	})
+
+	if len(result.Errors) > 0 {
+		fmt.Printf("Unexpected errors inside ExeeeecuteQuery: %v", result.Errors)
+	}
+
+	return result
+}

+package gql
+
+import (
+	"github.com/bradford-hamilton/go-graphql-api/postgres"
+	"github.com/graphql-go/graphql"
+)
+
+type Root struct {
+	Query *graphql.Object
+}
+
+func NewRoot(db *postgres.Db) *Root {
+	resolver := Resolver{db: db}
+
+	root := Root{
+		Query: graphql.NewObject(
+			graphql.ObjectConfig{
+				Name: "Query",
+				Fields: graphql.Fields{
+					"users": &graphql.Field{
+						Type: graphql.NewList(User),
+						Args: graphql.FieldConfigArgument{
+							"name": &graphql.ArgumentConfig{
+								Type: graphql.String,
+							},
+						},
+						Resolve: resolver.UserResolver,
+					},
+				},
+			},
+		),
+	}
+	return &root
+}

+package gql
+
+import (
+	"github.com/bradford-hamilton/go-graphql-api/postgres"
+	"github.com/graphql-go/graphql"
+)
+
+type Resolver struct {
+	db *postgres.Db
+}
+
+func (r *Resolver) UserResolver(p graphql.ResolveParams) (interface{}, error) {
+	name, ok := p.Args["name"].(string)
+	if ok {
+		users := r.db.GetUsersByName(name)
+		return users, nil
+	}
+
+	return nil, nil
+}

+package gql
+
+import "github.com/graphql-go/graphql"
+
+var User = graphql.NewObject(
+	graphql.ObjectConfig{
+		Name: "User",
+		Fields: graphql.Fields{
+			"id": &graphql.Field{
+				Type: graphql.Int,
+			},
+			"name": &graphql.Field{
+				Type: graphql.String,
+			},
+			"age": &graphql.Field{
+				Type: graphql.Int,
+			},
+			"profession": &graphql.Field{
+				Type: graphql.String,
+			},
+			"friendly": &graphql.Field{
+				Type: graphql.Boolean,
+			},
+		},
+	},
+)

+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+
+	"github.com/bradford-hamilton/go-graphql-api/gql"
+	"github.com/bradford-hamilton/go-graphql-api/postgres"
+	"github.com/bradford-hamilton/go-graphql-api/server"
+	"github.com/go-chi/chi"
+	"github.com/go-chi/chi/middleware"
+	"github.com/go-chi/render"
+	"github.com/graphql-go/graphql"
+)
+
+
+func main() {
+	router, db := initializeAPI()
+	defer db.Close()
+
+	log.Fatal(http.ListenAndServe(":4000", router))
+}
+
+func initializeAPI() (*chi.Mux, *postgres.Db) {
+	router := chi.NewRouter()
+
+	db, err := postgres.New(
+		postgres.ConnString("localhost", 5432, "bradford", "go_graphql_db"),
+	)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	rootQuery := gql.NewRoot(db)
+
+	sc, err := graphql.NewSchema(
+		graphql.SchemaConfig{Query: rootQuery.Query},
+	)
+	if err != nil {
+		fmt.Println("Error creating schema: ", err)
+	}
+
+	s := server.Server{
+		GqlSchema: &sc,
+	}
+
+	router.Use(
+		render.SetContentType(render.ContentTypeJSON),
+		middleware.Logger,
+		middleware.StripSlashes,
+		middleware.Recoverer,
+	)
+
+	router.Post("/graphql", s.GraphQL())
+
+	return router, db
+}

+package postgres
+
+import (
+	"database/sql"
+	"fmt"
+)
+
+type Db struct {
+	*sql.DB
+}
+
+func New(connString string) (*Db, error) {
+	db, err := sql.Open("postgres", connString)
+	if err != nil {
+		return nil, err
+	}
+
+	err = db.Ping()
+	if err != nil {
+		return nil, err
+	}
+
+	return &Db{db}, nil
+}
+
+func ConnString(host string, port int, user string, dbName string) string {
+	return fmt.Sprintf(
+		"host=%s port=%d user=%s dbname=%s sslmode=disable",
+		host, port, user, dbName,
+	)
+}
+
+type User struct {
+	ID         int
+	Name       string
+	Age        int
+	Profession string
+	Friendly   bool
+}
+
+func (d *Db) GetUsersByName(name string) []User {
+	stmt, err := d.Prepare("SELECT * FROM users WHERE name=$1")
+	if err != nil {
+		fmt.Println("GetUserByName Preparation Err: ", err)
+	}
+
+	rows, err := stmt.Query(name)
+	if err != nil {
+		fmt.Println("GetUserByName Query Err: ", err)
+	}
+
+	var r User
+
+	users := []User{}
+
+	for rows.Next() {
+		err = rows.Scan(
+			&r.ID,
+			&r.Name,
+			&r.Age,
+			&r.Profession,
+			&r.Friendly,
+		)
+		if err != nil {
+			fmt.Println("Error scanning rows: ", err)
+		}
+		users = append(users, r)
+	}
+
+	return users
+}

+package server
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/bradford-hamilton/go-graphql-api/gql"
+	"github.com/go-chi/render"
+	"github.com/graphql-go/graphql"
+)
+
+type Server struct {
+	GqlSchema *graphql.Schema
+}
+
+type reqBody struct {
+	Query string `json:"query"`
+}
+
+func (s *Server) GraphQL() http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		if r.Body == nil {
+			http.Error(w, "Must provide graphql query in request body", 400)
+			return
+		}
+
+		var rBody reqBody
+
+		err := json.NewDecoder(r.Body).Decode(&rBody)
+		if err != nil {
+			http.Error(w, "Error parsing JSON request body", 400)
+		}
+
+		result := gql.ExecuteQuery(rBody.Query, *s.GqlSchema)
+
+		render.JSON(w, r, result)
+	}
+}