go demo

array_demo.go

@@ -0,0 +1,18 @@
+package main
+
+import (
+	"fmt"
+)
+
+func test(x [2]int) {
+	fmt.Printf("x: %p\n", &x)
+	x[1] = 100
+}
+
+func main() {
+	var a = [2]int{}
+	fmt.Printf("a: %p\n", &a)
+	fmt.Println(a)
+	test(a)
+	fmt.Println(a)
+}

bit_demo.go

@@ -0,0 +1,17 @@
+package main
+
+import (
+	"fmt"
+)
+
+const (
+	_  = iota
+	KB = 1 << (iota * 10)
+	MB
+	GB
+	TB
+	PB
+	EB
+	YB
+	ZB
+)

concurrency_demo.go

@@ -0,0 +1,14 @@
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	c := make(chan bool)
+	go func() {
+		fmt.Println("Go Go Go!!!")
+		c <- true
+	}()
+	<-c
+}

controlflow.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	if a := 1; a > 1 {
+		fmt.Println("Hello")
+	} else { //else必须在}后面
+		fmt.Println(a)
+	}
+
+	s := "abc"
+	for i, n := 0, len(s); i < n; i++ { // 常⻅的for 循环，⽀持初始化语句。
+		fmt.Println(s[i])
+	}
+	n := len(s)
+	for n > 0 { // 替代while (n > 0) {}
+		println(s[n-1]) // 替代for (; n > 0;) {}
+		n--
+	}
+	for false { // 替代while (true) {}
+		println(s) // 替代for (;;) {}
+	}
+}

db/models.go

@@ -0,0 +1,55 @@
+package db
+
+import (
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/go-xorm/xorm"
+	_ "github.com/lib/pq"
+	_ "github.com/lunny/godbc"
+)
+
+//明细表
+type Tb_weigh_datalineinfo_detail struct {
+	Id          int64
+	BatchNumber int64     `xorm:"BatchNumber"`
+	CarNumber   string    `xorm:"varchar(30) CarNumber"`
+	Weight      float64   `xorm:'Weight'`
+	WeighTime   time.Time `xorm:"DateTime WeighTime"`
+	OperateBit  int64     `xorm:"OperateBit"`
+	Remark      string    `xorm: "Remark"`
+	Attribute1  string    `xorm:"varchar(100) Attribute1"`
+	Attribute2  string    `xorm:"varchar(100) Attribute2"`
+	Attribute3  string    `xorm:"varchar(100) Attribute3"`
+	Attribute4  string    `xorm:"varchar(100) Attribute4"`
+	Attribute5  string    `xorm:"varchar(100) Attribute5"`
+}
+
+var mssql *xorm.Engine
+var pqorm *xorm.Engine
+
+func NewDetail(batchNumber int64, weight float64) error {
+	_, err := mssql.Insert(&Tb_weigh_datalineinfo_detail{BatchNumber: batchNumber, Weight: weight, WeighTime: time.Now(), OperateBit: 1})
+	return err
+}
+
+func init() {
+	fmt.Println("main init")
+	//创建mssql orm引擎
+	var err error
+	mssql, err = xorm.NewEngine("odbc", "driver={sql server};server=127.0.0.1;port=1433;uid=sa;pwd=tlys.oaxmz.5860247;database=tgzljl_czgl")
+	if err != nil {
+		log.Fatalf("err happened", err)
+	}
+
+	//创建pq orm引擎
+	pqorm, err = xorm.NewEngine("postgres", "host=127.0.0.1 port=5432 user=zljl password=123 dbname=tgzljl_czgl sslmode=disable")
+	if err != nil {
+		log.Fatalln("pq orm created error:", err)
+	}
+	err = pqorm.Sync(new(Tb_weigh_datalineinfo_detail))
+	if err != nil {
+		log.Fatalln("pq orm sync error:", err)
+	}
+}

func_demo.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"fmt"
+)
+
+func A(a, b, c int) (r int, e string) {
+	e = "hello"
+	r = a + b + c
+	return
+}
+
+func S(a ...int) (r int) {
+	fmt.Println(r)
+	for _, b := range a {
+		r += b
+	}
+	return
+}
+
+func closure(x int) func(int) int {
+	return func(y int) int {
+		return x + y
+	}
+}
+
+func panic_demo() {
+	defer func() {
+		if err := recover(); err != nil {
+			fmt.Println("recover demo")
+		}
+	}()
+	panic("panic demo")
+}
+
+func main() {
+	f, s := A(1, 2, 3)
+	fmt.Println(f, s)
+	a := S(1, 2, 3, 4, 5)
+	fmt.Println(a)
+
+	b := closure(1)
+	fmt.Println(b(2))
+
+	defer fmt.Println(a)
+	defer fmt.Println(b(2))
+
+	for i := 0; i < 3; i++ {
+		defer func() {
+			fmt.Println(i)
+		}()
+	}
+
+	panic_demo()
+}

go_demo.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+func main() {
+	c1 := make(chan string)
+	go func() {
+		c1 <- "hello"
+		fmt.Println("write \"hello\" done!")
+
+		c1 <- "world"
+		fmt.Println("write \"world\" done!")
+
+		fmt.Println("write go to sleep")
+		time.Sleep(3 * time.Second)
+		c1 <- "channel"
+		fmt.Println("write \"channel\" done!")
+	}()
+
+	time.Sleep(2 * time.Second)
+	fmt.Println("Read wake up")
+
+	msg := <-c1
+	fmt.Println("Reader ", msg)
+
+	msg = <-c1
+	fmt.Println("Reader ", msg)
+
+	msg = <-c1
+	fmt.Println("Reader ", msg)
+}

hello.go

@@ -0,0 +1,7 @@
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("Hello, world! 你好，世界！")
+}

int_string.go

@@ -0,0 +1,14 @@
+package main
+
+import (
+	"fmt"
+	"strconv"
+)
+
+func main() {
+	var a = 65
+	b := strconv.Itoa(a)
+	fmt.Println(b)
+	a, _ = strconv.Atoi(b) #返回多个值，注意
+	fmt.Println(a)
+}

interface_demo.go

@@ -0,0 +1,30 @@
+package main
+
+import (
+	"fmt"
+)
+
+type empty interface {
+}
+
+type PhoneConnector struct {
+	name string
+}
+
+func main() {
+	phoneConnector := PhoneConnector{name: "Phone Connector"}
+	Disconnect(phoneConnector)
+}
+
+func Disconnect(usb empty) {
+	if phoneConnector, ok := usb.(PhoneConnector); ok {
+		fmt.Println("Phone disconnect:", phoneConnector.name)
+	}
+
+	switch v := usb.(type) {
+	case PhoneConnector:
+		fmt.Println("Phone disconnect:", v.name)
+	default:
+		fmt.Println("Unknow device")
+	}
+}

ipinfo.go

@@ -0,0 +1,12 @@
+package main
+
+import (
+	"github.com/yinheli/qqwry"
+	"log"
+)
+
+func main() {
+	q := qqwry.NewQQwry("qqwry.dat")
+	q.Find("180.89.94.90")
+	log.Printf("ip:%v, 国家：%v, City:%v", q.IP, q.Country, q.City)
+}

map_demo.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	a := map[string]struct {
+		name string
+		age  int
+	}{
+		"lixiang":  {"理想", 26},
+		"longlong": {"龙珑", 26},
+	}
+	fmt.Println(a)
+	var m map[string]string = make(map[string]string)
+	m["lixiang"] = "lixiang"
+	fmt.Println(m)
+	delete(m, "lixiang")
+	fmt.Println(m)
+}

method_demo.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"fmt"
+)
+
+type Person struct {
+	name string
+	age  int
+}
+
+func (per *Person) Profile() {
+	fmt.Println(per.name, per.age)
+}
+
+type INT int
+
+func (i *INT) Increment() {
+	*i += INT(100)
+}
+
+func main() {
+	p := Person{name: "lixiang", age: 27}
+	p.Profile()
+	var a INT = 2
+	a.Increment()
+	fmt.Println(a)
+}

panic_recover.go

@@ -0,0 +1,14 @@
+package main
+
+func test() {
+	defer func() {
+		if err := recover(); err != nil {
+			println(err.(string))
+		}
+	}()
+	panic("panic error")
+}
+
+func main() {
+	test()
+}