go strings.Split
时间: 2024-02-06 17:11:09 浏览: 87
go strings.Split() 是将一个字符串按照指定的分隔符进行分割,返回一个切片。其中 Split 是“分割”的意思。具体语法如下:
```go
func Split(s, sep string) []string
```
其中,s 是待分割的字符串,sep 是分隔符。例如,如果我们想要将字符串 "a,b,c" 按照逗号进行分割,可以这样写:
```go
str := "a,b,c"
arr := strings.Split(str, ",")
fmt.Println(arr) // 输出 [a b c]
```
相关问题
//修订号比较,s1大返回1,s2大返回-1,相等返回0;如果发生错误返回错误 func compareCor(s1, s2 string) (int,error ){ var i int //去除前导0 for { if i >= len(s1){ s1 = "0" break } if s1[i] == '0' { i++ } else { s1 = s1[i:] break } } i = 0 for { if i >= len(s2){ s2 = "0" break } if s2[i] == '0' { i++ } else { s2 = s2[i:] break } } if len(s1) == 0{ if len(s2) == 0{ return 0,nil }else{ return -1,nil } } s1Int,err := strconv.Atoi(s1) if err != nil { // log.Println("") return 0,err } s2Int,err := strconv.Atoi(s2) if err != nil { return 0,err } if s1Int == s2Int { return 0,nil }else if s1Int > s2Int{ return 1,nil }else{ return -1,nil } } //版本号比较,s1大返回1,s2大返回-1,相等返回0;发生错误则返回错误 func compare(version1 string, version2 string) (int,error ){ // write code here arr1 := strings.Split(version1, ".") arr2 := strings.Split(version2, ".") log.Println("arr1:",arr1) log.Println("arr2:",arr2) i := 0 for ;i < len(arr1) && i < len(arr2);i++{ res,err := compareCor(arr1[i],arr2[i]) if err != nil { log.Println("compareCor ERROR:",err) return 0,err } if res != 0 { return res,nil } } if len(arr1) == len(arr2) { return 0,nil } if len(arr1) > len(arr2){ for ;i < len(arr1);i++{ res,err := compareCor(arr1[i],"0") if err != nil { return 0,err }else{ if res != 0{ return res,nil } } } return 0,nil }else{ for ;i < len(arr2);i++{ res,err := compareCor("0",arr2[i]) if err != nil { return 0,err }else{ if res != 0{ return res,nil } } } return 0,nil } }这是go 语言的代码,转为C#代码
以下是将Go语言代码转换为C#代码的版本较函数:
```csharp
using System;
using System.Linq;
public class Program
{
// 修订比较,s1大1,s2大返回-1,相等返回0;如果发生错误返回错误
public static (int, Exception) CompareCor(string s1, string s2)
{
var i = 0;
// 去除前导0
while (i < s1.Length && s1[i] == '0')
{
i++;
}
if (i == s1.Length)
{
s1 = "0";
}
else
{
s1 = s1.Substring(i);
}
i = 0;
while (i < s2.Length && s2[i] == '0')
{
i++;
}
if (i == s2.Length)
{
s2 = "0";
}
else
{
s2 = s2.Substring(i);
}
if (s1.Length == 0)
{
if (s2.Length == 0)
{
return (0, null);
}
else
{
return (-1, null);
}
}
int s1Int, s2Int;
if (!int.TryParse(s1, out s1Int))
{
return (0, new Exception("Error parsing s1"));
}
if (!int.TryParse(s2, out s2Int))
{
return (0, new Exception("Error parsing s2"));
}
if (s1Int == s2Int)
{
return (0, null);
}
else if (s1Int > s2Int)
{
return (1, null);
}
else
{
return (-1, null);
}
}
// 版本号比较, s1大返回1,s2大返回-1,相等返回0;发生错误则返回错误
public static (int, Exception) Compare(string version1, string version2)
{
var arr1 = version1.Split('.');
var arr2 = version2.Split('.');
int i = 0;
for (; i < arr1.Length && i < arr2.Length; i++)
{
var (res, err) = CompareCor(arr1[i], arr2[i]);
if (err != null)
{
return (0, err);
}
if (res != 0)
{
return (res, null);
}
}
if (arr1.Length == arr2.Length)
{
return (0, null);
}
if (arr1.Length > arr2.Length)
{
for (; i < arr1.Length; i++)
{
var (res, err) = CompareCor(arr1[i], "0");
if (err != null)
{
return (0, err);
}
else
{
if (res != 0)
{
return (res, null);
}
}
}
return (0, null);
}
else
{
for (; i < arr2.Length; i++)
{
var (res, err) = CompareCor("0", arr2[i]);
if (err != null)
{
return (0, err);
}
else
{
if (res != 0)
{
return (res, null);
}
}
}
return (0, null);
}
}
public static void Main()
{
var version1 = "1.2.3";
var version2 = "1.2.4";
var (res, err) = Compare(version1, version2);
if (err != null)
{
Console.WriteLine("Error: " + err.Message);
}
else
{
Console.WriteLine("Comparison Result: " + res);
}
}
}
```
这段C#代码实现了与原始Go代码相同的逻辑,可以用于进行版本号比较。请注意,C#代码中的错误处理方式可能与Go代码不同,这是为了适应C#语言的异常处理机制。
帮我优化这段代码 // QueryProblemList 查询用户问题列表 func QueryProblemList(page, limit, status int) (map[string]any, error) { if limit == 0 { limit = 10 } dm := db.MysqlDB.Where("status=?", status) var count int64 dm.Model(&ProblemFeedback{}).Count(&count) totalPage := math.Ceil(float64(count) / float64(limit)) offset := (page - 1) * limit var userList []ProblemFeedback var list = make([]map[string]any, 0) dm.Limit(limit).Offset(offset).Order("id desc").Find(&userList) for _, u := range userList { var uInfo WechatUser db.MysqlDB.Find(&uInfo, u.WxID) list = append(list, map[string]any{ "problemID": u.ID, "userID": u.WxID, "nickName": uInfo.Nickname, "mobile": u.Mobile, "email": u.Email, "desc": u.Description, "images": strings.Split(u.Img, ","), "status": u.Status, "createTime": u.CreatedAt.Format(time.DateTime), }) } var info = map[string]any{ "totalCount": count, "totalPage": totalPage, "list": list, } return info, nil }
以下是对该函数进行优化后的代码,主要针对数据库查询进行了优化:
```go
// QueryProblemList 查询用户问题列表
func QueryProblemList(page, limit, status int) (map[string]interface{}, error) {
if limit == 0 {
limit = 10
}
var count int64
db.MysqlDB.Model(&ProblemFeedback{}).Where("status = ?", status).Count(&count)
totalPage := int(math.Ceil(float64(count) / float64(limit)))
var userList []struct {
ProblemFeedback
Nickname string `gorm:"column:nickname"`
}
err := db.MysqlDB.Table("problem_feedbacks").
Select("problem_feedbacks.id, problem_feedbacks.wx_id, nickname, problem_feedbacks.mobile, problem_feedbacks.email, problem_feedbacks.description, problem_feedbacks.img, problem_feedbacks.status, problem_feedbacks.created_at").
Joins("left join wechat_users on problem_feedbacks.wx_id = wechat_users.wx_id").
Where("problem_feedbacks.status = ?", status).
Order("problem_feedbacks.id desc").
Limit(limit).
Offset((page - 1) * limit).
Scan(&userList).Error
if err != nil {
return nil, err
}
var list = make([]map[string]interface{}, 0, len(userList))
for _, u := range userList {
list = append(list, map[string]interface{}{
"problemID": u.ID,
"userID": u.WxID,
"nickName": u.Nickname,
"mobile": u.Mobile,
"email": u.Email,
"desc": u.Description,
"images": strings.Split(u.Img, ","),
"status": u.Status,
"createTime": u.CreatedAt.Format("2006-01-02 15:04:05"),
})
}
var info = map[string]interface{}{
"totalCount": count,
"totalPage": totalPage,
"list": list,
}
return info, nil
}
```
对代码的优化主要包括以下几个方面:
1. 将查询条件和查询结果放在同一个语句中,避免多次查询数据库。
2. 使用 `gorm` 的 `Table` 方法来指定表名,避免反射获取表名的开销。
3. 使用 `Scan` 方法来查询结果,避免循环查询数据库的开销。
4. 将 `map[string]any` 类型改为 `map[string]interface{}`,避免使用 `any` 类型的开销。
经过优化后,该函数的查询效率和性能都有了一定的提升,可以更好地满足业务需求。
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