From e6f167f6d7885b39b1788e621db38adf1407b180 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=96=BB=E4=BD=B3=E9=91=AB?= <real251024@163.com>
Date: Sat, 1 Apr 2023 09:55:24 +0800
Subject: [PATCH] =?UTF-8?q?feat:=E8=8E=B7=E5=8F=96=E9=A1=B5=EF=BC=8C?=
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---
 client/mysql.go       |  9 +++++++++
 utils/common_utils.go | 45 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+)
 create mode 100644 utils/common_utils.go

diff --git a/client/mysql.go b/client/mysql.go
index 4af0830..5d9d8f5 100644
--- a/client/mysql.go
+++ b/client/mysql.go
@@ -80,3 +80,12 @@ func NumberHandler(results *sql.Rows) []int {
 	}
 	return numbers
 }
+
+// IsValidString 判断sql里面的数据是否合法
+func IsValidString(nullString sql.NullString) string {
+	if nullString.Valid {
+		return nullString.String
+	}
+
+	return ""
+}
diff --git a/utils/common_utils.go b/utils/common_utils.go
new file mode 100644
index 0000000..caf0e26
--- /dev/null
+++ b/utils/common_utils.go
@@ -0,0 +1,45 @@
+package utils
+
+import (
+	"github.com/shootz-developer/gtool/constant"
+	"log"
+	"math"
+	"strconv"
+)
+
+// EarthDistance 计算距离
+func EarthDistance(lat1, lng1, lat2, lng2 float64) float64 {
+	lat1 = lat1 * math.Pi / 180.0
+	lng1 = lng1 * math.Pi / 180.0
+	lat2 = lat2 * math.Pi / 180.0
+	lng2 = lng2 * math.Pi / 180.0
+	a := lat1 - lat2
+	b := lng1 - lng2
+	s := 2 * math.Asin(
+		math.Sqrt(math.Pow(math.Sin(a/2), 2)+math.Cos(lat1)*math.Cos(lat2)*math.Pow(math.Sin(b/2), 2)))
+	s = s * 6378.137
+	s = math.Round(s*10000) / 10000
+	return s
+}
+
+// GetPage 获取页
+func GetPage(pageStr string) int {
+	page, err := strconv.Atoi(pageStr)
+	if err != nil {
+		log.Printf("Page string to int err: [%+v]", err)
+		return constant.DefaultPage
+	}
+
+	return page
+}
+
+// GetLimit 获取页大小
+func GetLimit(pageStr string) int {
+	limit, err := strconv.Atoi(pageStr)
+	if err != nil {
+		log.Printf("Page string to int err: [%+v]", err)
+		return constant.DefaultLimit
+	}
+
+	return limit
+}