first

common/tool/coinconvert.go

@@ -0,0 +1,19 @@
+package tool
+
+import "github.com/shopspring/decimal"
+
+var oneHundredDecimal decimal.Decimal = decimal.NewFromInt(100)
+
+//分转元
+func Fen2Yuan(fen int64) float64 {
+	y, _ := decimal.NewFromInt(fen).Div(oneHundredDecimal).Truncate(2).Float64()
+	return y
+}
+
+//元转分
+func Yuan2Fen(yuan float64) int64 {
+
+	f, _ := decimal.NewFromFloat(yuan).Mul(oneHundredDecimal).Truncate(0).Float64()
+	return int64(f)
+
+}

common/tool/encryption.go

@@ -0,0 +1,23 @@
+package tool
+
+import (
+	"crypto/md5"
+	"fmt"
+	"io"
+)
+
+/** 加密方式 **/
+
+func Md5ByString(str string) string {
+	m := md5.New()
+	_, err := io.WriteString(m, str)
+	if err != nil {
+		panic(err)
+	}
+	arr := m.Sum(nil)
+	return fmt.Sprintf("%x", arr)
+}
+
+func Md5ByBytes(b []byte) string {
+	return fmt.Sprintf("%x", md5.Sum(b))
+}

common/tool/krand.go

@@ -0,0 +1,28 @@
+package tool
+
+import (
+	"math/rand"
+	"time"
+)
+
+const (
+	KC_RAND_KIND_NUM   = 0 // 纯数字
+	KC_RAND_KIND_LOWER = 1 // 小写字母
+	KC_RAND_KIND_UPPER = 2 // 大写字母
+	KC_RAND_KIND_ALL   = 3 // 数字、大小写字母
+)
+
+// 随机字符串
+func Krand(size int, kind int) string {
+	ikind, kinds, result := kind, [][]int{[]int{10, 48}, []int{26, 97}, []int{26, 65}}, make([]byte, size)
+	is_all := kind > 2 || kind < 0
+	rand.Seed(time.Now().UnixNano())
+	for i := 0; i < size; i++ {
+		if is_all { // random ikind
+			ikind = rand.Intn(3)
+		}
+		scope, base := kinds[ikind][0], kinds[ikind][1]
+		result[i] = uint8(base + rand.Intn(scope))
+	}
+	return string(result)
+}

common/tool/krand_test.go

@@ -0,0 +1,8 @@
+package tool
+
+import "testing"
+
+func TestMd5ByString(t *testing.T) {
+	s := Md5ByString("AAA")
+	t.Log(s)
+}

common/tool/placeholders.go

@@ -0,0 +1,15 @@
+package tool
+
+import "strings"
+
+//替换
+func InPlaceholders(n int) string {
+	var b strings.Builder
+	for i := 0; i < n-1; i++ {
+		b.WriteString("?,")
+	}
+	if n > 0 {
+		b.WriteString("?")
+	}
+	return b.String()
+}