{"id":139940,"date":"2020-07-14T23:47:09","date_gmt":"2020-07-14T15:47:09","guid":{"rendered":"http:\/\/4563.org\/?p=139940"},"modified":"2020-07-14T23:47:09","modified_gmt":"2020-07-14T15:47:09","slug":"%e5%85%b3%e4%ba%8e-go-%e5%8d%8f%e7%a8%8b%e7%9a%84%e4%b8%80%e4%b8%aa%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=139940","title":{"rendered":"\u5173\u4e8e go \u534f\u7a0b\u7684\u4e00\u4e2a\u95ee\u9898?"},"content":{"rendered":"
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\u5173\u4e8e go \u534f\u7a0b\u7684\u4e00\u4e2a\u95ee\u9898? <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : Zach369 <\/span> <\/i> 9<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\u9700\u6c42:<\/p>\n

fun main(){      x1(id string) (objectEntity entity, error) {}          x2(id string) (objectEntity []entity, error) {}          x3(id string) (objectEntity entity, error) {} } <\/code><\/pre>\n
x1(),x2(),x3()\u5206\u522b\u662f\u4e09\u4e2a\u4e92\u76f8\u4e0d\u5173\u8054\u7684 3 \u4e2a sql \u67e5\u8be2. x1 \u4f1a\u8fd4\u56de\u4e00\u4e2a objectEntity, error, x2 \u4f1a\u8fd4\u56de\u4e00\u4e2a[]objectEntity, x3 \u4f1a\u8fd4\u56de\u4e00\u4e2a objectEntity. \u6211\u4f1a\u62ff\u5230\u8fd9 3 \u4e2a\u8fd4\u56de\u503c,\u7136\u540e\u8fdb\u884c\u62fc\u63a5.
 \u672c\u6765\u76f4\u63a5\u4f7f\u7528 goroutine \u548c channel \u6765\u8fdb\u884c\u8bf7\u6c42. \u4f46\u662f\u6211\u9047\u5230\u4e00\u4e2a\u95ee\u9898, \u4e0d\u7ba1\u662f x1,x2,x3 \u8fdb\u884c\u67e5\u8be2,\u8fd4\u56de\u503c \u90fd\u6709 error. \u5927\u5bb6\u6709\u4ec0\u4e48\u597d\u7684\u529e\u6cd5\u5417?<\/p>\n<\/p><\/div>\n
 \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (16<\/span>)        <\/div>\n
 <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : Immortal <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 “\u4e0d\u7ba1\u662f x1,x2,x3 \u8fdb\u884c\u67e5\u8be2,\u8fd4\u56de\u503c \u90fd\u6709 error” ???
    \u6709 error \u4e0d\u5c31\u662f\u62a5\u9519\u4e86\u4e48,\u4e0d\u80fd\u5148\u5904\u7406\u4e86 error \u518d\u8003\u8651\u540e\u9762\u62fc\u63a5\u7684\u95ee\u9898\u4e48
    \u5177\u4f53\u5f97\u770b\u4f60\u4eec\u5bb9\u9519\u7a0b\u5ea6,\u4e00\u4e2a\u6216\u591a\u4e2a\u51fa\u9519\u4e86\u5c31\u4e0d\u53c2\u4e0e\u62fc\u63a5 \u8fd8\u662f \u4e0d\u80fd\u6709 error \u5fc5\u987b\u4fdd\u8bc1\u5168\u90e8\u6709\u7ed3\u679c\u624d\u80fd\u62fc\u63a5<\/p>\n
    \u518d\u53e6\u5916\u8bf4\u4e00\u53e5,\u65e2\u7136\u8981\u540c\u6b65\u62fc\u63a5,\u6839\u672c\u4e0d\u9700\u8981\u8d70\u534f\u7a0b,\u540c\u6b65\u6267\u884c\u5c31\u884c\u4e86.\u5f02\u6b65\u53cd\u800c\u66f4\u9ebb\u70e6                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : caryqy <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u8fd9\u4e2a\u597d\u50cf\u548c\u534f\u7a0b\u6ca1\u5565\u5173\u7cfb\uff0c\u8981\u6839\u636e\u4f60\u9700\u6c42\u6765\u51b3\u5b9a\u5427\uff0c\u6bd4\u5982\u67d0\u4e2a\u8fd4\u56de\u503c\u6709 error \u65f6\u7528\u4e2a\u9ed8\u8ba4\u503c\u6765\u4ee3\u66ff                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : Vegetable <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u518d\u5b9a\u4e49\u4e00\u4e2a channel \u5904\u7406 error \u5457                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : KaynW <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u641e\u4e0d\u61c2\u8fd9\u4e3a\u4ec0\u4e48\u662f\u534f\u7a0b\u7684\u95ee\u9898                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : xmge <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u81f3\u5c11\u5199\u4e2a\u80fd\u8dd1\u8d77\u6765\u7684\u4f2a\u4ee3\u7801\uff0c\u8ba9\u5927\u5bb6\u8dd1\u4e00\u4e0b\u5427…… \u8981\u4e0d\u5927\u5bb6\u90fd\u4e0d\u77e5\u9053\u4f60\u7684\u4ee3\u7801\u662f\u548b\u6837\u7684\uff0c\u4e5f\u65e0\u6cd5\u7ed9\u4f60\u89e3\u51b3\u95ee\u9898                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : wangritian <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 xResult {
     obj objectEntity
     err Error
    }
    \u4e0d\u8fc7\u6211\u89c9\u5f97\u8fd9\u6cd5\u5b50\u4e0d\u592a\u6807\u51c6                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : Zach369 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @Immortal \u7b2c\u4e00: \u5f02\u6b65\u8fd8\u662f\u6709\u5fc5\u8981\u7684, \u5047\u5982 x1 \u9700\u8981 0.5s x2 \u9700\u8981 0.5s x3 \u9700\u8981 0.8s. \u5982\u679c\u540c\u6b65\u6267\u884c,\u5c31\u9700\u8981 1.8s. \u5f02\u6b65\u67e5\u8be2,0.8s \u5c31\u53ef\u4ee5\u62ff\u5230\u6240\u6709\u7684\u7ed3\u679c. \u7b2c\u4e8c: \u67e5\u8be2\u6709\u9519\u8bef,\u662f\u56e0\u4e3a\u6240\u6709\u7684 orm \u5305\u5728\u67e5\u8be2\u7684\u65f6\u5019,\u90fd\u4f1a\u8fd4\u56de error \u8fd9\u4e2a\u503c. \u6211\u76ee\u524d\u62bd\u51fa\u6765\u7684\u51fd\u6570 \u90fd\u6ca1\u6709\u76f4\u63a5\u5bf9 error \u8fdb\u884c\u5904\u7406.\u90fd\u662f\u8fd4\u56de\u6b63\u5e38\u7684\u7ed3\u679c\u548c error.\u7136\u540e\u5728\u5916\u5c42\u7edf\u4e00\u5904\u7406.                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : vvmint233 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u628a[]objectEntity \u548c error \u5408\u6210\u4e3a\u4e00\u4e2a\u7ed3\u6784\u4f53
    “`golang
    type A struct {
     list []objectEntity
     err error
    }
    “`
    \u7136\u540e\u9519\u8bef\u903b\u8f91\u653e\u5230 service \u5c42\u505a\u5904\u7406                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : bruce0 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4e0d\u7ba1\u6709\u6ca1\u6709\u534f\u7a0b,\u4e0d\u90fd\u662f\u5e94\u8be5\u5148\u5904\u7406 error?
    \u53ea\u8981 error \u4e0d\u662f nil
    \u76f4\u63a5\u8fd4\u56de\u7ed9\u8c03\u7528\u8005\u5904\u7406\u5c31\u884c\u4e86                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : Zach369 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @all \u6211\u52a0\u4e86\u4f2a\u4ee3\u7801 \u6c42<\/p>\n
    “`
    \u6211\u52a0\u4e86\u4f2a\u4ee3\u7801… \u6c42\u5927\u5bb6\u5e2e\u5fd9\u5199\u4e2a gorouter<\/p>\n
    “`
    func main() {
     id := 1
     user1, err := x1(id)
     if err != nil {
     \/\/ \u5904\u7406
     }
     userList, err := x2(id)
     if err != nil {
     \/\/ \u5904\u7406
     }
     user2, err := x3(id)
     if err != nil {
     \/\/ \u5904\u7406
     }<\/p>\n
     \/\/ \u7136\u540e user1, userList, user2 \u8fdb\u884c\u62fc\u63a5
    }<\/p>\n
    type User struct {
     Id int `json:”id”`
     Name string `json:”name”`
    }<\/p>\n
    func x1(id int) (User, error) {
     var err error
     user := User{
     Id: 1,
     Name: “xx”,
     }<\/p>\n
     return user, err
    }<\/p>\n
    func x2(id int) ([]User, error) {
     var err error
     user := User{
     Id: 1,
     Name: “xx”,
     }
     userList := []User{user, user}<\/p>\n
     return userList, err
    }<\/p>\n
    func x3(id int) (User, error) {
     var err error
     var user User
     {
     }
     err = errors.New(“\u5047\u8bbe\u51fa\u73b0\u9519\u8bef”)<\/p>\n
     return user, err
    }<\/p>\n
    “`<\/p>\n
    “`                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : Immortal <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @Zach369 #7 
    \u6211\u4e0d\u77e5\u9053\u4f60\u7528\u7684\u4ec0\u4e48 orm \u5305,\u5e38\u7528\u7684 gorm \u67e5\u8be2\u7ed3\u679c\u662f\u4e0d\u53ef\u80fd\u6709 error \u7684,\u9664\u975e\u662f\u67e5\u8be2\u7ed3\u679c\u4e0d\u5b58\u5728\u4f1a\u6709\u4e2a”record not found”\u7684 error <\/p>\n
    \u5f02\u6b65\u8fd9\u4e2a\u4f60\u8bf4\u7684\u662f\u5bf9\u7684,\u5982\u679c\u6240\u6709\u67e5\u8be2\u90fd\u6b63\u5e38\u7684\u8bdd.
    \u7c97\u7565\u60f3\u4e86\u4e0b\u4f60\u8981\u7528 channel \u9700\u8981\u5c31\u9700\u8981\u628a\u7ed3\u679c\u548c error \u7edf\u4e00\u5305\u4e00\u4e2a\u7ed3\u6784\u4f53.\u53ef\u80fd\u7528 sync.WaitGroup \u66f4\u7b80\u5355\u4e00\u4e9b.                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : Zach369 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 “`
    func main() {
     id := 1
     user1, err := x1(id)
     if err != nil {
     \/\/ \u5904\u7406
     }
     userList, err := x2(id)
     if err != nil {
     \/\/ \u5904\u7406
     }
     user2, err := x3(id)
     if err != nil {
     \/\/ \u5904\u7406
     }<\/p>\n
     \/\/ \u7136\u540e user1, userList, user2 \u8fdb\u884c\u62fc\u63a5
    }<\/p>\n
    type User struct {
     Id int `json:”id”`
     Name string `json:”name”`
    }<\/p>\n
    func x1(id int) (User, error) {
     var err error
     user := User{
     Id: 1,
     Name: “xx”,
     }<\/p>\n
     return user, err
    }<\/p>\n
    func x2(id int) ([]User, error) {
     var err error
     user := User{
     Id: 1,
     Name: “xx”,
     }
     userList := []User{user, user}<\/p>\n
     return userList, err
    }<\/p>\n
    func x3(id int) (User, error) {
     var err error
     var user User
     {
     }
     err = errors.New(“\u5047\u8bbe\u51fa\u73b0\u9519\u8bef”)<\/p>\n
     return user, err
    }<\/p>\n
    “`                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : mengzhuo <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4f60\u8fd9\u7528 waitgroup \u6700\u5408\u9002\u4e86<\/p>\n
    wg.Add(3)
    errCh := make(chan error)
    userCh := make(chan *User)<\/p>\n
    go func(){
    defer wg.Done()
    user, err := x1()
    if err != nil {<\/p>\n
    }
    }()                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : icexin <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u7528 errgroup \u6765\u505a\u975e\u5e38\u7b80\u5355 
    https:\/\/gist.github.com\/icexin\/dda98e3c7dbbf2d8b37ef1fc79267197