mapInt := make(map[string]int) 只能保存int类型的value。 如下定义: mapInterface := make(map[string]interface{}) 可以保存string、int等不同类型的value。 mu := make([]map[string]interface{},0) a1 := map[string]interface{} {"id": 1, "parentId": 0, "createTime": "2020-02-02T06:5...
package main import ( "fmt" ) //declare a rectangle struct type rectangle struct { length int width int } //declare a square struct type square struct { side int } //declare an interface with area() as a member type shape interface { area() int } //declare a method area() //the...
Headers: map[string]interface{}{ "x-delay": "5000", // 消息从交换机过期时间,毫秒(x-dead-message插件提供) }, }) failOnError(err, "Failed to publish a message") log.Printf(" [x] Sent %s", body)} 消费者 package mainimport ( "github.com/streadway/amqp" "log")func failOnError(err ...
匿名结构体： 比使用 map[string]interface{} 更经济和更安全。point :=struct{ X, Y int}{1,2} 指针 p :=Vertex{1,2}// p is a Vertexq :=&p // q is a pointer to a Vertexr :=&Vertex{1,2}// r is also a pointer to a Vertex// The type of a pointer to a Vertex is...
func (r *RabbitMQ) PublishSimple(message string) { //1.申请队列,如果队列不存在会自动创建,存在则跳过创建 //额外属性 var args = make(map[string]interface{}) args["x-message-ttl"] = 20000 //设置队列的过期时间(单位是毫秒) args["x-dead-letter-exchange"] = "dead_message_exchange" // ...
见:https://go.dev/tour/methods/16 Example: (https://go.dev/play/p/gSRuHBoQYah): package mainimport ( "encoding/json" "fmt" "log")func printInterface(o interface{}) { switch v := o.(type) { case map[string]interface{}: fmt.Printf("this is a map. a: %+v\n", v["a"])...
declare-x GOBIN="//home/lightdb/go/bin"declare-x GOPATH="/home/lightdb/go"declare-x GOROOT="//home/lightdb/go/go" 这样脚手架就可以运行了。 [lightdb@lightdb-dev src]$ cd go-web/ [lightdb@lightdb-dev go-web]$ go build ginweb.go # go build也是个很大的范畴,可以参考https://blog....
That parameter section must declare a single parameter, the receiver. Its type must be of the form T or *T (possibly using parentheses) where T is a type name. The type denoted by T is called the receiver base type; it must not be a pointer or interface type and it must be ...
Append to a file Delete Delete a file in Go Delete a folder in Go Update Change the updated/modified time of a file in Go Rename Rename a file or folder Generic Check if a file is a directory in Go Create an empty file in Go ...
var foo, bar int = 42, 1302 // declare and init multiple vars at once var foo = 42 // type omitted, will be inferred foo := 42 // shorthand, only in func bodies, omit var keyword, type is always implicit const constant = "This is a constant" ...