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examples: adds crud example
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# Go GraphQL CRUD example | ||
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Implementation create, read, update and delete on Go | ||
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To run the program, go to the directory | ||
`cd examples/crud` | ||
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Run the example | ||
`go run main.go` | ||
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## Create | ||
`http://localhost:8080/product?query=mutation+_{create(name:"Inca Kola",info:"Inca Kola is a soft drink that was created in Peru in 1935 by British immigrant Joseph Robinson Lindley using lemon verbena (wiki)",price:1.99){id,name,info,price}}` | ||
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## Read | ||
Get single product by id | ||
`http://localhost:8080/product?query={product(id:1){name,info,price}}` | ||
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Get product list | ||
`http://localhost:8080/product?query={list{id,name,info,price}}` | ||
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## Update | ||
`http://localhost:8080/product?query=mutation+_{update(id:1,price:3.95){id,name,info,price}}` | ||
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## Delete | ||
`http://localhost:8080/product?query=mutation+_{delete(id:1){id,name,info,price}}` |
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package main | ||
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import ( | ||
"encoding/json" | ||
"fmt" | ||
"math/rand" | ||
"net/http" | ||
"time" | ||
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"github.com/graphql-go/graphql" | ||
) | ||
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type Product struct { | ||
ID int64 `json:"id"` | ||
Name string `json:"name"` | ||
Info string `json:"info,omitempty"` | ||
Price float64 `json:"price"` | ||
} | ||
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var products []Product | ||
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var productType = graphql.NewObject( | ||
graphql.ObjectConfig{ | ||
Name: "Product", | ||
Fields: graphql.Fields{ | ||
"id": &graphql.Field{ | ||
Type: graphql.Int, | ||
}, | ||
"name": &graphql.Field{ | ||
Type: graphql.String, | ||
}, | ||
"info": &graphql.Field{ | ||
Type: graphql.String, | ||
}, | ||
"price": &graphql.Field{ | ||
Type: graphql.Float, | ||
}, | ||
}, | ||
}, | ||
) | ||
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var queryType = graphql.NewObject( | ||
graphql.ObjectConfig{ | ||
Name: "Query", | ||
Fields: graphql.Fields{ | ||
/* Get (read) single product by id | ||
http://localhost:8080/product?query={product(id:1){name,info,price}} | ||
*/ | ||
"product": &graphql.Field{ | ||
Type: productType, | ||
Description: "Get product by id", | ||
Args: graphql.FieldConfigArgument{ | ||
"id": &graphql.ArgumentConfig{ | ||
Type: graphql.Int, | ||
}, | ||
}, | ||
Resolve: func(p graphql.ResolveParams) (interface{}, error) { | ||
id, ok := p.Args["id"].(int) | ||
if ok { | ||
// Find product | ||
for _, product := range products { | ||
if int(product.ID) == id { | ||
return product, nil | ||
} | ||
} | ||
} | ||
return nil, nil | ||
}, | ||
}, | ||
/* Get (read) product list | ||
http://localhost:8080/product?query={list{id,name,info,price}} | ||
*/ | ||
"list": &graphql.Field{ | ||
Type: graphql.NewList(productType), | ||
Description: "Get product list", | ||
Resolve: func(params graphql.ResolveParams) (interface{}, error) { | ||
return products, nil | ||
}, | ||
}, | ||
}, | ||
}) | ||
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var mutationType = graphql.NewObject(graphql.ObjectConfig{ | ||
Name: "Mutation", | ||
Fields: graphql.Fields{ | ||
/* Create new product item | ||
http://localhost:8080/product?query=mutation+_{create(name:"Inca Kola",info:"Inca Kola is a soft drink that was created in Peru in 1935 by British immigrant Joseph Robinson Lindley using lemon verbena (wiki)",price:1.99){id,name,info,price}} | ||
*/ | ||
"create": &graphql.Field{ | ||
Type: productType, | ||
Description: "Create new product", | ||
Args: graphql.FieldConfigArgument{ | ||
"name": &graphql.ArgumentConfig{ | ||
Type: graphql.NewNonNull(graphql.String), | ||
}, | ||
"info": &graphql.ArgumentConfig{ | ||
Type: graphql.String, | ||
}, | ||
"price": &graphql.ArgumentConfig{ | ||
Type: graphql.NewNonNull(graphql.Float), | ||
}, | ||
}, | ||
Resolve: func(params graphql.ResolveParams) (interface{}, error) { | ||
rand.Seed(time.Now().UnixNano()) | ||
product := Product{ | ||
ID: int64(rand.Intn(100000)), // generate random ID | ||
Name: params.Args["name"].(string), | ||
Info: params.Args["info"].(string), | ||
Price: params.Args["price"].(float64), | ||
} | ||
products = append(products, product) | ||
return product, nil | ||
}, | ||
}, | ||
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/* Update product by id | ||
http://localhost:8080/product?query=mutation+_{update(id:1,price:3.95){id,name,info,price}} | ||
*/ | ||
"update": &graphql.Field{ | ||
Type: productType, | ||
Description: "Update product by id", | ||
Args: graphql.FieldConfigArgument{ | ||
"id": &graphql.ArgumentConfig{ | ||
Type: graphql.NewNonNull(graphql.Int), | ||
}, | ||
"name": &graphql.ArgumentConfig{ | ||
Type: graphql.String, | ||
}, | ||
"info": &graphql.ArgumentConfig{ | ||
Type: graphql.String, | ||
}, | ||
"price": &graphql.ArgumentConfig{ | ||
Type: graphql.Float, | ||
}, | ||
}, | ||
Resolve: func(params graphql.ResolveParams) (interface{}, error) { | ||
id, _ := params.Args["id"].(int) | ||
name, nameOk := params.Args["name"].(string) | ||
info, infoOk := params.Args["info"].(string) | ||
price, priceOk := params.Args["price"].(float64) | ||
product := Product{} | ||
for i, p := range products { | ||
if int64(id) == p.ID { | ||
if nameOk { | ||
products[i].Name = name | ||
} | ||
if infoOk { | ||
products[i].Info = info | ||
} | ||
if priceOk { | ||
products[i].Price = price | ||
} | ||
product = products[i] | ||
break | ||
} | ||
} | ||
return product, nil | ||
}, | ||
}, | ||
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/* Delete product by id | ||
http://localhost:8080/product?query=mutation+_{delete(id:1){id,name,info,price}} | ||
*/ | ||
"delete": &graphql.Field{ | ||
Type: productType, | ||
Description: "Delete product by id", | ||
Args: graphql.FieldConfigArgument{ | ||
"id": &graphql.ArgumentConfig{ | ||
Type: graphql.NewNonNull(graphql.Int), | ||
}, | ||
}, | ||
Resolve: func(params graphql.ResolveParams) (interface{}, error) { | ||
id, _ := params.Args["id"].(int) | ||
product := Product{} | ||
for i, p := range products { | ||
if int64(id) == p.ID { | ||
product = products[i] | ||
// Remove from product list | ||
products = append(products[:i], products[i+1:]...) | ||
} | ||
} | ||
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return product, nil | ||
}, | ||
}, | ||
}, | ||
}) | ||
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var schema, _ = graphql.NewSchema( | ||
graphql.SchemaConfig{ | ||
Query: queryType, | ||
Mutation: mutationType, | ||
}, | ||
) | ||
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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("errors: %v", result.Errors) | ||
} | ||
return result | ||
} | ||
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func initProductsData(p *[]Product) { | ||
product1 := Product{ID: 1, Name: "Chicha Morada", Info: "Chicha morada is a beverage originated in the Andean regions of Perú but is actually consumed at a national level (wiki)", Price: 7.99} | ||
product2 := Product{ID: 2, Name: "Chicha de jora", Info: "Chicha de jora is a corn beer chicha prepared by germinating maize, extracting the malt sugars, boiling the wort, and fermenting it in large vessels (traditionally huge earthenware vats) for several days (wiki)", Price: 5.95} | ||
product3 := Product{ID: 3, Name: "Pisco", Info: "Pisco is a colorless or yellowish-to-amber colored brandy produced in winemaking regions of Peru and Chile (wiki)", Price: 9.95} | ||
*p = append(*p, product1, product2, product3) | ||
} | ||
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func main() { | ||
// Primary data initialization | ||
initProductsData(&products) | ||
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http.HandleFunc("/product", func(w http.ResponseWriter, r *http.Request) { | ||
result := executeQuery(r.URL.Query().Get("query"), schema) | ||
json.NewEncoder(w).Encode(result) | ||
}) | ||
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fmt.Println("Server is running on port 8080") | ||
http.ListenAndServe(":8080", nil) | ||
} |