{"id":10006863,"date":"2022-11-17T02:56:04","date_gmt":"2022-11-16T18:56:04","guid":{"rendered":"https:\/\/ityet.com\/?p=10006863"},"modified":"2022-11-17T02:56:04","modified_gmt":"2022-11-16T18:56:04","slug":"golang-copier%e5%85%a5%e9%97%a8%e5%88%b0%e5%85%a5%e5%9d%91","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10006863","title":{"rendered":"Golang Copier\u5165\u95e8\u5230\u5165\u5751"},"content":{"rendered":"

github: https:\/\/github.com\/jinzhu\/copier<\/a><\/p>\n

\u7531\u4e8e golang<\/code> \u6ca1\u6709\u5bf9\u590d\u6742\u7ed3\u6784\u4f53\u7684 clone<\/code> \u65b9\u6cd5\uff0c\u6240\u4ee5\uff0c\u5c31\u9700\u8981\u6709 copier<\/code> \u8fd9\u6837\u7684\u5de5\u5177\u5e93\u3002<\/p>\n

\u5b83\u770b\u8d77\u6765\u5f88\u7b80\u5355\uff0c\u4f46\u5b9e\u9645\u4f7f\u7528\u4e2d\uff0c\u6709\u4e9b\u201c\u5751\u201d\u8fd8\u662f\u8981\u6ce8\u610f\uff01<\/p>\n

\u672c\u6587\uff1a<\/p>\n

\u5165\u95e8\u4e3a\u8f85\uff0c\u63a2\u201c\u5751\u201d\u4e3a\u4e3b\uff0c<\/strong><\/p>\n

\u770b\u5b8c\u518d\u5212\u8d70\uff0cCS\u6211\u6ca1\u6709\u3002<\/strong><\/p>\n

\"\u6ee1\u5634\u987a\u53e3\u6e9c\"<\/p>\n

\u5b89\u88c5<\/h2>\n
go get github.com\/jinzhu\/copier<\/code><\/pre>\n
\u5feb\u901f\u5165\u95e8<\/h2>\n
\u597d\u7684\uff0c\u6765\u4e00\u6bb5\u4ee3\u7801\u5feb\u901f\u4e86\u89e3 copier<\/code><\/p>\n
package main\n\nimport (\n    "fmt"\n    "github.com\/jinzhu\/copier"\n)\n\ntype SC struct {\n    C uint8\n}\n\n\ntype M1 struct {\n    A int\n    W string\n    S *SC\n}\n\nfunc main() {\n    var src = M1{12, "Hello", &SC{32}}\n    var dst = M1{}\n    fmt.Printf("before copy src %+v\/tdst %+v\/n", src, dst)\n    copier.Copy(&dst, src)\n    fmt.Printf("after  copy src %+v\/tdst %+v\/n", src, dst)\n}<\/code><\/pre>\n
\u8f93\u51fa\uff1a<\/p>\n
before copy src {A:12 W:Hello S:0xc00017f550}   dst {A:0 W: S:<nil>}\nafter  copy src {A:12 W:Hello S:0xc00017f550}   dst {A:12 W:Hello S:0xc00017f618}<\/code><\/pre>\n
\u597d\u7684\uff0c\u770b\u5230\u8fd9\uff0c\u4f60\u5c31\u5df2\u638c\u63e1\u4e86 copier<\/code> 80%\u7684\u529f\u80fd\u4e86\u3002\u5148\u522b\u7740\u6025\u5212\u8d70\uff0c\u63a5\u4e0b\u6765\u8fd8\u662f\u8e29\u5751\u8bb0\u5f55\u3002<\/p>\n
\n
\u672c\u6587\u4ee3\u7801\u8fd0\u884c\u8f93\u51fa\u5185\u5bb9\u662f\u57fa\u4e8e github.com\/jinzhu\/copier@v0.3.5 \u548c go1.16.1 darwin\/amd64 \u73af\u5883\u6f14\u793a\u7684\u7ed3\u679c\u3002<\/p>\n
http:\/\/itjsz.com<\/a><\/p>\n<\/blockquote>\n
\u5165\u5751<\/h2>\n
package main\n\nimport (\n    "fmt"\n    "github.com\/davecgh\/go-spew\/spew"\n    "github.com\/jinzhu\/copier"\n)\n\ntype SC struct {\n    C uint8\n}\n\ntype Map1 struct {\n    M map[string]int32\n    A []int32\n    C *SC\n}\n\nfunc main() {\n    var src = Map1{map[string]int32{"C:": 3, "d": 4}, []int32{9, 8}, &SC{32}}\n    var dst1 = Map1{}\n    spew.Printf("before src %+v\/t\/tdst %+v\/n", src, dst1)\n    copier.Copy(&dst1, src)\n    dst1.M["F"] = 5\n    dst1.M["g"] = 6\n    dst1.A[0] = 7\n    dst1.C.C = 27\n    spew.Printf("after  src %+v\/tdst %+v\/n", src, dst1)\n}<\/code><\/pre>\n
\u4ee5\u4e0a\u4ee3\u7801\u8fd0\u884c\u540e\u4f1a\u8f93\u51fa\uff1a<\/p>\n
before src {M:map[C::3 d:4] A:[9 8] C:<*>(0xc00012a1e8){C:32}}          dst {M:<nil> A:<nil> C:<nil>}<\/code><\/pre>\n
befre \u90a3\u4e00\u884c\u4ee3\u7801\u5982\u4e0a\u2b06\ufe0f \uff0c after \u90a3\u4e00\u884c\u4f1a\u8f93\u51fa\u4ec0\u4e48\u5462\uff1f<\/p>\n
1. after  src {M:map[C::3 d:4] A:[9 8] C:<*>(0xc00012a1e8){C:27}}  dst {M:map[C::3 d:4 F:5 g:6] A:[7 8] C:<*>(0xc00012a348){C:27}}\n2. after  src {M:map[C::3 d:4] A:[9 8] C:<*>(0xc00012a1e8){C:32}}  dst {M:map[C::3 d:4 F:5 g:6] A:[7 8] C:<*>(0xc00012a348){C:27}}\n3. after  src {M:map[C::3 d:4] A:[7 8] C:<*>(0xc00012a1e8){C:32}}  dst {M:map[C::3 d:4 F:5 g:6] A:[7 8] C:<*>(0xc00012a348){C:27}}\n4. after  src {M:map[C::3 d:4 F:5 g:6] A:[7 8] C:<*>(0xc00012a1e8){C:32}}  dst {M:map[C::3 d:4 F:5 g:6] A:[7 8] C:<*>(0xc00012a348){C:27}}\n5. after  src {M:map[C::3 d:4 F:5 g:6] A:[7 8] C:<*>(0xc00012a1e8){C:27}}  dst {M:map[C::3 d:4 F:5 g:6] A:[7 8] C:<*>(0xc00012a348){C:27}}<\/code><\/pre>\n
\u7b54\u6848\u662f\uff1a  var a = int(759 \/ 6 \/ 31.5)<\/p>\n
\u4e3a\u4e86\u907f\u514d\u4e0d\u5c0f\u5fc3\u770b\u4e86\u7b54\u6848\uff0c\u8bf7\u8ba1\u7b97 759 \/ 6 \/ 31.5 \u5f97\u51fa\u7684\u503c\u56db\u820d\u4e94\u5165\u4fbf\u662f\u3002<\/p><\/blockquote>\n
\u518d\u63a2\u5751<\/h2>\n
\u51fa\u5751<\/h2>\n
\u6211\u770b\u5176\u4ed6\u540c\u5b66\u4f7f\u7528 copier<\/code> \u4e5f\u662f\u50cf\u4e0a\u9762\u90a3\u6837\u2014\u2014copier.Copy($dst, src)<\/code>, \u5f53\u7136\u5566\uff0c\u4e5f\u4e0d\u6392\u9664\u6211\uff01\u5b83\u4eff\u4f5b\u5c31\u662f\u4e00\u628a\u5c0f\u5de7\u7cbe\u608d\u7684\u5c0f\u5200\u3002\u4e00\u4e2a\u7b80\u5355\u7684\u51fd\u6570\u8c03\u7528\uff0c\u5c31\u5b8c\u6210\u4e86\u5b83\u7684\u4f7f\u547d\u3002<\/p>\n
\u7136\u800c\uff0c\u5b83\u5176\u5b9e\u662f\u628a\u591a\u529f\u80fd\u5200\uff0c\u6211\u90fd\u8fd8\u6ca1\u6709\u6253\u5f00\u5b83\u7684\u2014\u2014 option<\/code>\u3002<\/p>\n
\u4e0a\u9762\u7684\u95ee\u9898\u5c31\u662f\uff0c\u6211 Copy \u540e\uff0c\u5bf9\u503c\u7684\u6539\u52a8\uff0c\u5f71\u54cd\u4e86\u53e6\u4e00\u4e2a\u503c\u7684 map\uff0c\u90a3\u4e48\u8fd9\u4e2a\u65f6\u5019\uff0c\u5c31\u9700\u8981\u8fdb\u884c\u6df1 copy\u3002\u63a5\u4e0b\u6765\u5f15\u5165 copier<\/code> \u7684 option<\/code><\/p>\n
package main\n\nimport (\n    "fmt"\n    "github.com\/davecgh\/go-spew\/spew"\n    "github.com\/jinzhu\/copier"\n)\n\ntype SC struct {\n    C uint8\n}\n\ntype Map1 struct {\n    M map[string]int32\n    A []int32\n    C *SC\n}\n\nfunc main() {\n    var src = Map1{map[string]int32{"C:": 3, "d": 4}, []int32{9, 8}, &SC{32}}\n    var dst1 = Map1{}\n    spew.Printf("before src %+v\/t\/tdst %+v\/n", src, dst1)\n    \n    copier.CopyWithOption(&dst1, src, copier.Option{DeepCopy: true})   \/\/ \u8fd9\u91cc\uff01\n    \n    dst1.M["F"] = 5\n    dst1.M["g"] = 6\n    dst1.A[0] = 7\n    dst1.C.C = 27\n    spew.Printf("after  src %+v\/tdst %+v\/n", src, dst1)\n}<\/code><\/pre>\n
\u597d\u7684\uff0c\u8fd9\u6837copy\u4e4b\u540e\uff0c\u5bf9\u65b0\u53d8\u91cf\u7684\u6539\u52a8\uff0c\u4e0d\u4f1a\u4f20\u9012\u4f1a\u539f\u53d8\u91cf\u6539\u52a8\u4e86\u3002<\/p>\n
\u518d\u76d8\u4e00\u76d8\u5751<\/h2>\n
package main\n\nimport (\n    "fmt"\n\n    "github.com\/davecgh\/go-spew\/spew"\n    "github.com\/jinzhu\/copier"\n)\n\ntype ArrTC struct {\n    Name [2]string\n    C    *ArrTC\n}\n\ntype ArrT struct {\n    A  [3]int32\n    S  []int32\n    E  []int32\n    C  string\n    V  string\n    M map[string]int32\n    AC ArrTC\n    s bool\n}\n\nfunc main() {\n    var src = ArrT{\n        [3]int32{9, 10, 0},\n        []int32{12, 0},\n        []int32{},\n        "",\n        "val",\n        map[string]int32{"A:": 1, "b": 0},\n        ArrTC{},\n        true,\n    }\n    var dst = ArrT{\n        [3]int32{1, 2, 3},\n        []int32{4, 5, 6, 7},\n        []int32{9, 10},\n        "char",\n        "ha",\n        map[string]int32{"C:": 3, "b": 4, ".": 0},\n        ArrTC{[2]string{"Y", "Z"}, nil},\n        false,\n    }\n    spew.Printf("before src %+v\/tdst %+v\/n", src, dst)\n    copier.CopyWithOption(&dst, src, copier.Option{IgnoreEmpty: true, DeepCopy: true})\n    spew.Printf("after  src %+v\/tdst %+v\/n", src, dst)\n    src.M["b"] = 99\n    src.S[1] = 1\n    dst.S[0] = 2\n    spew.Printf("last  src %+v\/tdst %+v\/n\/n", src, dst)\n}<\/code><\/pre>\n
\u8f93\u51fa\uff1a<\/p>\n
before src {A:[9 10 0] S:[12 0] E:[] C: V:val M:map[A::1 b:0] AC:{Name:[ ] C:<nil>} s:true}    dst {A:[1 2 3] S:[4 5 6 7] E:[9 10] C:char V:ha M:map[C::3 b:4 .:0] AC:{Name:[Y Z] C:<nil>} s:false}\nafter  src {A:[9 10 0] S:[12 0] E:[] C: V:val M:map[A::1 b:0] AC:{Name:[ ] C:<nil>} s:true}    dst {A:[9 10 0] S:[12 0 6 7] E:[9 10] C:char V:val M:map[A::1 C::3 b:0 .:0] AC:{Name:[Y Z] C:<nil>} s:true}\nlast  src {A:[9 10 0] S:[12 1] E:[] C: V:val M:map[A::1 b:99] AC:{Name:[ ] C:<nil>} s:true}    dst {A:[9 10 0] S:[2 0 6 7] E:[9 10] C:char V:val M:map[C::3 b:0 .:0 A::1] AC:{Name:[Y Z] C:<nil>} s:true}<\/code><\/pre>\n
\u8fd9\u6b21\u7684\u4ee3\u7801\u6211\u52a0\u4e0a\u4e86 IgnoreEmpty: true<\/code>, \u4e5f\u5c31\u662f\u590d\u5236\u65f6\u5ffd\u7565\u7a7a\u7684\u503c\u3002 \u4e5f\u5c31\u8bf4\u53ef\u4ee5\u5f53\u4f5c\u503c merge \u7528\u3002<\/p>\n
\u7136\u540e\uff0c\u53c8\u6d4b\u8bd5\u4e86\u4e00\u4e0b\u53d8\u91cf\u72ec\u7acb\u6027\u3002\u590d\u5236\u4e4b\u540e\uff0csrc<\/code>, dst<\/code>  \u4e24\u4e2a\u53d8\u91cf\u518d\u65e0\u74dc\u845b\uff0c\u5bf9\u5176\u4e2d\u4e00\u4e2a\u503c\u7684\u4efb\u610f\u6539\u52a8\u90fd\u4e0d\u4f1a\u540c\u6b65\u5230\u53e6\u4e00\u4e2a\u503c\u3002<\/p>\n
\u4f46\u662f\uff0c\u8fd9\u4e2a merge<\/code> \u7684\u8868\u73b0\uff0c\u53ef\u80fd\u4e0d\u662f\u4f60\u60f3\u7684\u90a3\u6837\uff0c<\/p>\n
src.S = []int32{12, 0}\ndst.S = []int32{4, 5, 6, 7}\n## \u8c03\u7528 copy \u540e\uff0c \u4f60\u9884\u671f\u7684\u7ed3\u679c\u662f\u4ec0\u4e48\uff1f[6\/7]\n6. dst.S = []int32{12, 0}\n7. dst.S = []int32{12, 0, 6, 7}<\/code><\/pre>\n